pmap.c revision 1.333
1 /* $NetBSD: pmap.c,v 1.333 2016/07/12 15:40:53 skrll Exp $ */ 2 3 /* 4 * Copyright 2003 Wasabi Systems, Inc. 5 * All rights reserved. 6 * 7 * Written by Steve C. Woodford for Wasabi Systems, Inc. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed for the NetBSD Project by 20 * Wasabi Systems, Inc. 21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 22 * or promote products derived from this software without specific prior 23 * written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 /* 39 * Copyright (c) 2002-2003 Wasabi Systems, Inc. 40 * Copyright (c) 2001 Richard Earnshaw 41 * Copyright (c) 2001-2002 Christopher Gilbert 42 * All rights reserved. 43 * 44 * 1. Redistributions of source code must retain the above copyright 45 * notice, this list of conditions and the following disclaimer. 46 * 2. Redistributions in binary form must reproduce the above copyright 47 * notice, this list of conditions and the following disclaimer in the 48 * documentation and/or other materials provided with the distribution. 49 * 3. The name of the company nor the name of the author may be used to 50 * endorse or promote products derived from this software without specific 51 * prior written permission. 52 * 53 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 54 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 55 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 56 * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 57 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 58 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 59 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 61 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 62 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 63 * SUCH DAMAGE. 64 */ 65 66 /*- 67 * Copyright (c) 1999 The NetBSD Foundation, Inc. 68 * All rights reserved. 69 * 70 * This code is derived from software contributed to The NetBSD Foundation 71 * by Charles M. Hannum. 72 * 73 * Redistribution and use in source and binary forms, with or without 74 * modification, are permitted provided that the following conditions 75 * are met: 76 * 1. Redistributions of source code must retain the above copyright 77 * notice, this list of conditions and the following disclaimer. 78 * 2. Redistributions in binary form must reproduce the above copyright 79 * notice, this list of conditions and the following disclaimer in the 80 * documentation and/or other materials provided with the distribution. 81 * 82 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 83 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 84 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 85 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 86 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 87 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 88 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 89 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 90 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 91 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 92 * POSSIBILITY OF SUCH DAMAGE. 93 */ 94 95 /* 96 * Copyright (c) 1994-1998 Mark Brinicombe. 97 * Copyright (c) 1994 Brini. 98 * All rights reserved. 99 * 100 * This code is derived from software written for Brini by Mark Brinicombe 101 * 102 * Redistribution and use in source and binary forms, with or without 103 * modification, are permitted provided that the following conditions 104 * are met: 105 * 1. Redistributions of source code must retain the above copyright 106 * notice, this list of conditions and the following disclaimer. 107 * 2. Redistributions in binary form must reproduce the above copyright 108 * notice, this list of conditions and the following disclaimer in the 109 * documentation and/or other materials provided with the distribution. 110 * 3. All advertising materials mentioning features or use of this software 111 * must display the following acknowledgement: 112 * This product includes software developed by Mark Brinicombe. 113 * 4. The name of the author may not be used to endorse or promote products 114 * derived from this software without specific prior written permission. 115 * 116 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 117 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 118 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 119 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 120 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 121 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 122 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 123 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 124 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 125 * 126 * RiscBSD kernel project 127 * 128 * pmap.c 129 * 130 * Machine dependent vm stuff 131 * 132 * Created : 20/09/94 133 */ 134 135 /* 136 * armv6 and VIPT cache support by 3am Software Foundry, 137 * Copyright (c) 2007 Microsoft 138 */ 139 140 /* 141 * Performance improvements, UVM changes, overhauls and part-rewrites 142 * were contributed by Neil A. Carson <neil (at) causality.com>. 143 */ 144 145 /* 146 * Overhauled again to speedup the pmap, use MMU Domains so that L1 tables 147 * can be shared, and re-work the KVM layout, by Steve Woodford of Wasabi 148 * Systems, Inc. 149 * 150 * There are still a few things outstanding at this time: 151 * 152 * - There are some unresolved issues for MP systems: 153 * 154 * o The L1 metadata needs a lock, or more specifically, some places 155 * need to acquire an exclusive lock when modifying L1 translation 156 * table entries. 157 * 158 * o When one cpu modifies an L1 entry, and that L1 table is also 159 * being used by another cpu, then the latter will need to be told 160 * that a tlb invalidation may be necessary. (But only if the old 161 * domain number in the L1 entry being over-written is currently 162 * the active domain on that cpu). I guess there are lots more tlb 163 * shootdown issues too... 164 * 165 * o If the vector_page is at 0x00000000 instead of in kernel VA space, 166 * then MP systems will lose big-time because of the MMU domain hack. 167 * The only way this can be solved (apart from moving the vector 168 * page to 0xffff0000) is to reserve the first 1MB of user address 169 * space for kernel use only. This would require re-linking all 170 * applications so that the text section starts above this 1MB 171 * boundary. 172 * 173 * o Tracking which VM space is resident in the cache/tlb has not yet 174 * been implemented for MP systems. 175 * 176 * o Finally, there is a pathological condition where two cpus running 177 * two separate processes (not lwps) which happen to share an L1 178 * can get into a fight over one or more L1 entries. This will result 179 * in a significant slow-down if both processes are in tight loops. 180 */ 181 182 /* 183 * Special compilation symbols 184 * PMAP_DEBUG - Build in pmap_debug_level code 185 */ 186 187 /* Include header files */ 188 189 #include "opt_arm_debug.h" 190 #include "opt_cpuoptions.h" 191 #include "opt_pmap_debug.h" 192 #include "opt_ddb.h" 193 #include "opt_lockdebug.h" 194 #include "opt_multiprocessor.h" 195 196 #ifdef MULTIPROCESSOR 197 #define _INTR_PRIVATE 198 #endif 199 200 #include <sys/param.h> 201 #include <sys/types.h> 202 #include <sys/kernel.h> 203 #include <sys/systm.h> 204 #include <sys/proc.h> 205 #include <sys/intr.h> 206 #include <sys/pool.h> 207 #include <sys/kmem.h> 208 #include <sys/cdefs.h> 209 #include <sys/cpu.h> 210 #include <sys/sysctl.h> 211 #include <sys/bus.h> 212 #include <sys/atomic.h> 213 #include <sys/kernhist.h> 214 215 #include <uvm/uvm.h> 216 #include <uvm/pmap/pmap_pvt.h> 217 218 #include <arm/locore.h> 219 220 __KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.333 2016/07/12 15:40:53 skrll Exp $"); 221 222 //#define PMAP_DEBUG 223 #ifdef PMAP_DEBUG 224 225 /* XXX need to get rid of all refs to this */ 226 int pmap_debug_level = 0; 227 228 /* 229 * for switching to potentially finer grained debugging 230 */ 231 #define PDB_FOLLOW 0x0001 232 #define PDB_INIT 0x0002 233 #define PDB_ENTER 0x0004 234 #define PDB_REMOVE 0x0008 235 #define PDB_CREATE 0x0010 236 #define PDB_PTPAGE 0x0020 237 #define PDB_GROWKERN 0x0040 238 #define PDB_BITS 0x0080 239 #define PDB_COLLECT 0x0100 240 #define PDB_PROTECT 0x0200 241 #define PDB_MAP_L1 0x0400 242 #define PDB_BOOTSTRAP 0x1000 243 #define PDB_PARANOIA 0x2000 244 #define PDB_WIRING 0x4000 245 #define PDB_PVDUMP 0x8000 246 #define PDB_VAC 0x10000 247 #define PDB_KENTER 0x20000 248 #define PDB_KREMOVE 0x40000 249 #define PDB_EXEC 0x80000 250 251 int debugmap = 1; 252 int pmapdebug = 0; 253 #define NPDEBUG(_lev_,_stat_) \ 254 if (pmapdebug & (_lev_)) \ 255 ((_stat_)) 256 257 #else /* PMAP_DEBUG */ 258 #define NPDEBUG(_lev_,_stat_) /* Nothing */ 259 #endif /* PMAP_DEBUG */ 260 261 /* 262 * pmap_kernel() points here 263 */ 264 static struct pmap kernel_pmap_store = { 265 #ifndef ARM_MMU_EXTENDED 266 .pm_activated = true, 267 .pm_domain = PMAP_DOMAIN_KERNEL, 268 .pm_cstate.cs_all = PMAP_CACHE_STATE_ALL, 269 #endif 270 }; 271 struct pmap * const kernel_pmap_ptr = &kernel_pmap_store; 272 #undef pmap_kernel 273 #define pmap_kernel() (&kernel_pmap_store) 274 #ifdef PMAP_NEED_ALLOC_POOLPAGE 275 int arm_poolpage_vmfreelist = VM_FREELIST_DEFAULT; 276 #endif 277 278 /* 279 * Pool and cache that pmap structures are allocated from. 280 * We use a cache to avoid clearing the pm_l2[] array (1KB) 281 * in pmap_create(). 282 */ 283 static struct pool_cache pmap_cache; 284 285 /* 286 * Pool of PV structures 287 */ 288 static struct pool pmap_pv_pool; 289 static void *pmap_bootstrap_pv_page_alloc(struct pool *, int); 290 static void pmap_bootstrap_pv_page_free(struct pool *, void *); 291 static struct pool_allocator pmap_bootstrap_pv_allocator = { 292 pmap_bootstrap_pv_page_alloc, pmap_bootstrap_pv_page_free 293 }; 294 295 /* 296 * Pool and cache of l2_dtable structures. 297 * We use a cache to avoid clearing the structures when they're 298 * allocated. (196 bytes) 299 */ 300 static struct pool_cache pmap_l2dtable_cache; 301 static vaddr_t pmap_kernel_l2dtable_kva; 302 303 /* 304 * Pool and cache of L2 page descriptors. 305 * We use a cache to avoid clearing the descriptor table 306 * when they're allocated. (1KB) 307 */ 308 static struct pool_cache pmap_l2ptp_cache; 309 static vaddr_t pmap_kernel_l2ptp_kva; 310 static paddr_t pmap_kernel_l2ptp_phys; 311 312 #ifdef PMAPCOUNTERS 313 #define PMAP_EVCNT_INITIALIZER(name) \ 314 EVCNT_INITIALIZER(EVCNT_TYPE_MISC, NULL, "pmap", name) 315 316 #if defined(PMAP_CACHE_VIPT) && !defined(ARM_MMU_EXTENDED) 317 static struct evcnt pmap_ev_vac_clean_one = 318 PMAP_EVCNT_INITIALIZER("clean page (1 color)"); 319 static struct evcnt pmap_ev_vac_flush_one = 320 PMAP_EVCNT_INITIALIZER("flush page (1 color)"); 321 static struct evcnt pmap_ev_vac_flush_lots = 322 PMAP_EVCNT_INITIALIZER("flush page (2+ colors)"); 323 static struct evcnt pmap_ev_vac_flush_lots2 = 324 PMAP_EVCNT_INITIALIZER("flush page (2+ colors, kmpage)"); 325 EVCNT_ATTACH_STATIC(pmap_ev_vac_clean_one); 326 EVCNT_ATTACH_STATIC(pmap_ev_vac_flush_one); 327 EVCNT_ATTACH_STATIC(pmap_ev_vac_flush_lots); 328 EVCNT_ATTACH_STATIC(pmap_ev_vac_flush_lots2); 329 330 static struct evcnt pmap_ev_vac_color_new = 331 PMAP_EVCNT_INITIALIZER("new page color"); 332 static struct evcnt pmap_ev_vac_color_reuse = 333 PMAP_EVCNT_INITIALIZER("ok first page color"); 334 static struct evcnt pmap_ev_vac_color_ok = 335 PMAP_EVCNT_INITIALIZER("ok page color"); 336 static struct evcnt pmap_ev_vac_color_blind = 337 PMAP_EVCNT_INITIALIZER("blind page color"); 338 static struct evcnt pmap_ev_vac_color_change = 339 PMAP_EVCNT_INITIALIZER("change page color"); 340 static struct evcnt pmap_ev_vac_color_erase = 341 PMAP_EVCNT_INITIALIZER("erase page color"); 342 static struct evcnt pmap_ev_vac_color_none = 343 PMAP_EVCNT_INITIALIZER("no page color"); 344 static struct evcnt pmap_ev_vac_color_restore = 345 PMAP_EVCNT_INITIALIZER("restore page color"); 346 347 EVCNT_ATTACH_STATIC(pmap_ev_vac_color_new); 348 EVCNT_ATTACH_STATIC(pmap_ev_vac_color_reuse); 349 EVCNT_ATTACH_STATIC(pmap_ev_vac_color_ok); 350 EVCNT_ATTACH_STATIC(pmap_ev_vac_color_blind); 351 EVCNT_ATTACH_STATIC(pmap_ev_vac_color_change); 352 EVCNT_ATTACH_STATIC(pmap_ev_vac_color_erase); 353 EVCNT_ATTACH_STATIC(pmap_ev_vac_color_none); 354 EVCNT_ATTACH_STATIC(pmap_ev_vac_color_restore); 355 #endif 356 357 static struct evcnt pmap_ev_mappings = 358 PMAP_EVCNT_INITIALIZER("pages mapped"); 359 static struct evcnt pmap_ev_unmappings = 360 PMAP_EVCNT_INITIALIZER("pages unmapped"); 361 static struct evcnt pmap_ev_remappings = 362 PMAP_EVCNT_INITIALIZER("pages remapped"); 363 364 EVCNT_ATTACH_STATIC(pmap_ev_mappings); 365 EVCNT_ATTACH_STATIC(pmap_ev_unmappings); 366 EVCNT_ATTACH_STATIC(pmap_ev_remappings); 367 368 static struct evcnt pmap_ev_kernel_mappings = 369 PMAP_EVCNT_INITIALIZER("kernel pages mapped"); 370 static struct evcnt pmap_ev_kernel_unmappings = 371 PMAP_EVCNT_INITIALIZER("kernel pages unmapped"); 372 static struct evcnt pmap_ev_kernel_remappings = 373 PMAP_EVCNT_INITIALIZER("kernel pages remapped"); 374 375 EVCNT_ATTACH_STATIC(pmap_ev_kernel_mappings); 376 EVCNT_ATTACH_STATIC(pmap_ev_kernel_unmappings); 377 EVCNT_ATTACH_STATIC(pmap_ev_kernel_remappings); 378 379 static struct evcnt pmap_ev_kenter_mappings = 380 PMAP_EVCNT_INITIALIZER("kenter pages mapped"); 381 static struct evcnt pmap_ev_kenter_unmappings = 382 PMAP_EVCNT_INITIALIZER("kenter pages unmapped"); 383 static struct evcnt pmap_ev_kenter_remappings = 384 PMAP_EVCNT_INITIALIZER("kenter pages remapped"); 385 static struct evcnt pmap_ev_pt_mappings = 386 PMAP_EVCNT_INITIALIZER("page table pages mapped"); 387 388 EVCNT_ATTACH_STATIC(pmap_ev_kenter_mappings); 389 EVCNT_ATTACH_STATIC(pmap_ev_kenter_unmappings); 390 EVCNT_ATTACH_STATIC(pmap_ev_kenter_remappings); 391 EVCNT_ATTACH_STATIC(pmap_ev_pt_mappings); 392 393 static struct evcnt pmap_ev_fixup_mod = 394 PMAP_EVCNT_INITIALIZER("page modification emulations"); 395 static struct evcnt pmap_ev_fixup_ref = 396 PMAP_EVCNT_INITIALIZER("page reference emulations"); 397 static struct evcnt pmap_ev_fixup_exec = 398 PMAP_EVCNT_INITIALIZER("exec pages fixed up"); 399 static struct evcnt pmap_ev_fixup_pdes = 400 PMAP_EVCNT_INITIALIZER("pdes fixed up"); 401 #ifndef ARM_MMU_EXTENDED 402 static struct evcnt pmap_ev_fixup_ptesync = 403 PMAP_EVCNT_INITIALIZER("ptesync fixed"); 404 #endif 405 406 EVCNT_ATTACH_STATIC(pmap_ev_fixup_mod); 407 EVCNT_ATTACH_STATIC(pmap_ev_fixup_ref); 408 EVCNT_ATTACH_STATIC(pmap_ev_fixup_exec); 409 EVCNT_ATTACH_STATIC(pmap_ev_fixup_pdes); 410 #ifndef ARM_MMU_EXTENDED 411 EVCNT_ATTACH_STATIC(pmap_ev_fixup_ptesync); 412 #endif 413 414 #ifdef PMAP_CACHE_VIPT 415 static struct evcnt pmap_ev_exec_mappings = 416 PMAP_EVCNT_INITIALIZER("exec pages mapped"); 417 static struct evcnt pmap_ev_exec_cached = 418 PMAP_EVCNT_INITIALIZER("exec pages cached"); 419 420 EVCNT_ATTACH_STATIC(pmap_ev_exec_mappings); 421 EVCNT_ATTACH_STATIC(pmap_ev_exec_cached); 422 423 static struct evcnt pmap_ev_exec_synced = 424 PMAP_EVCNT_INITIALIZER("exec pages synced"); 425 static struct evcnt pmap_ev_exec_synced_map = 426 PMAP_EVCNT_INITIALIZER("exec pages synced (MP)"); 427 #ifndef ARM_MMU_EXTENDED 428 static struct evcnt pmap_ev_exec_synced_unmap = 429 PMAP_EVCNT_INITIALIZER("exec pages synced (UM)"); 430 static struct evcnt pmap_ev_exec_synced_remap = 431 PMAP_EVCNT_INITIALIZER("exec pages synced (RM)"); 432 static struct evcnt pmap_ev_exec_synced_clearbit = 433 PMAP_EVCNT_INITIALIZER("exec pages synced (DG)"); 434 static struct evcnt pmap_ev_exec_synced_kremove = 435 PMAP_EVCNT_INITIALIZER("exec pages synced (KU)"); 436 #endif 437 438 EVCNT_ATTACH_STATIC(pmap_ev_exec_synced); 439 EVCNT_ATTACH_STATIC(pmap_ev_exec_synced_map); 440 #ifndef ARM_MMU_EXTENDED 441 EVCNT_ATTACH_STATIC(pmap_ev_exec_synced_unmap); 442 EVCNT_ATTACH_STATIC(pmap_ev_exec_synced_remap); 443 EVCNT_ATTACH_STATIC(pmap_ev_exec_synced_clearbit); 444 EVCNT_ATTACH_STATIC(pmap_ev_exec_synced_kremove); 445 #endif 446 447 static struct evcnt pmap_ev_exec_discarded_unmap = 448 PMAP_EVCNT_INITIALIZER("exec pages discarded (UM)"); 449 static struct evcnt pmap_ev_exec_discarded_zero = 450 PMAP_EVCNT_INITIALIZER("exec pages discarded (ZP)"); 451 static struct evcnt pmap_ev_exec_discarded_copy = 452 PMAP_EVCNT_INITIALIZER("exec pages discarded (CP)"); 453 static struct evcnt pmap_ev_exec_discarded_page_protect = 454 PMAP_EVCNT_INITIALIZER("exec pages discarded (PP)"); 455 static struct evcnt pmap_ev_exec_discarded_clearbit = 456 PMAP_EVCNT_INITIALIZER("exec pages discarded (DG)"); 457 static struct evcnt pmap_ev_exec_discarded_kremove = 458 PMAP_EVCNT_INITIALIZER("exec pages discarded (KU)"); 459 #ifdef ARM_MMU_EXTENDED 460 static struct evcnt pmap_ev_exec_discarded_modfixup = 461 PMAP_EVCNT_INITIALIZER("exec pages discarded (MF)"); 462 #endif 463 464 EVCNT_ATTACH_STATIC(pmap_ev_exec_discarded_unmap); 465 EVCNT_ATTACH_STATIC(pmap_ev_exec_discarded_zero); 466 EVCNT_ATTACH_STATIC(pmap_ev_exec_discarded_copy); 467 EVCNT_ATTACH_STATIC(pmap_ev_exec_discarded_page_protect); 468 EVCNT_ATTACH_STATIC(pmap_ev_exec_discarded_clearbit); 469 EVCNT_ATTACH_STATIC(pmap_ev_exec_discarded_kremove); 470 #ifdef ARM_MMU_EXTENDED 471 EVCNT_ATTACH_STATIC(pmap_ev_exec_discarded_modfixup); 472 #endif 473 #endif /* PMAP_CACHE_VIPT */ 474 475 static struct evcnt pmap_ev_updates = PMAP_EVCNT_INITIALIZER("updates"); 476 static struct evcnt pmap_ev_collects = PMAP_EVCNT_INITIALIZER("collects"); 477 static struct evcnt pmap_ev_activations = PMAP_EVCNT_INITIALIZER("activations"); 478 479 EVCNT_ATTACH_STATIC(pmap_ev_updates); 480 EVCNT_ATTACH_STATIC(pmap_ev_collects); 481 EVCNT_ATTACH_STATIC(pmap_ev_activations); 482 483 #define PMAPCOUNT(x) ((void)(pmap_ev_##x.ev_count++)) 484 #else 485 #define PMAPCOUNT(x) ((void)0) 486 #endif 487 488 /* 489 * pmap copy/zero page, and mem(5) hook point 490 */ 491 static pt_entry_t *csrc_pte, *cdst_pte; 492 static vaddr_t csrcp, cdstp; 493 #ifdef MULTIPROCESSOR 494 static size_t cnptes; 495 #define cpu_csrc_pte(o) (csrc_pte + cnptes * cpu_number() + ((o) >> L2_S_SHIFT)) 496 #define cpu_cdst_pte(o) (cdst_pte + cnptes * cpu_number() + ((o) >> L2_S_SHIFT)) 497 #define cpu_csrcp(o) (csrcp + L2_S_SIZE * cnptes * cpu_number() + (o)) 498 #define cpu_cdstp(o) (cdstp + L2_S_SIZE * cnptes * cpu_number() + (o)) 499 #else 500 #define cpu_csrc_pte(o) (csrc_pte + ((o) >> L2_S_SHIFT)) 501 #define cpu_cdst_pte(o) (cdst_pte + ((o) >> L2_S_SHIFT)) 502 #define cpu_csrcp(o) (csrcp + (o)) 503 #define cpu_cdstp(o) (cdstp + (o)) 504 #endif 505 vaddr_t memhook; /* used by mem.c & others */ 506 kmutex_t memlock __cacheline_aligned; /* used by mem.c & others */ 507 kmutex_t pmap_lock __cacheline_aligned; 508 extern void *msgbufaddr; 509 int pmap_kmpages; 510 /* 511 * Flag to indicate if pmap_init() has done its thing 512 */ 513 bool pmap_initialized; 514 515 #if defined(ARM_MMU_EXTENDED) && defined(__HAVE_MM_MD_DIRECT_MAPPED_PHYS) 516 /* 517 * Virtual end of direct-mapped memory 518 */ 519 vaddr_t pmap_directlimit; 520 #endif 521 522 /* 523 * Misc. locking data structures 524 */ 525 526 static inline void 527 pmap_acquire_pmap_lock(pmap_t pm) 528 { 529 if (pm == pmap_kernel()) { 530 #ifdef MULTIPROCESSOR 531 KERNEL_LOCK(1, NULL); 532 #endif 533 } else { 534 mutex_enter(pm->pm_lock); 535 } 536 } 537 538 static inline void 539 pmap_release_pmap_lock(pmap_t pm) 540 { 541 if (pm == pmap_kernel()) { 542 #ifdef MULTIPROCESSOR 543 KERNEL_UNLOCK_ONE(NULL); 544 #endif 545 } else { 546 mutex_exit(pm->pm_lock); 547 } 548 } 549 550 static inline void 551 pmap_acquire_page_lock(struct vm_page_md *md) 552 { 553 mutex_enter(&pmap_lock); 554 } 555 556 static inline void 557 pmap_release_page_lock(struct vm_page_md *md) 558 { 559 mutex_exit(&pmap_lock); 560 } 561 562 #ifdef DIAGNOSTIC 563 static inline int 564 pmap_page_locked_p(struct vm_page_md *md) 565 { 566 return mutex_owned(&pmap_lock); 567 } 568 #endif 569 570 571 /* 572 * Metadata for L1 translation tables. 573 */ 574 #ifndef ARM_MMU_EXTENDED 575 struct l1_ttable { 576 /* Entry on the L1 Table list */ 577 SLIST_ENTRY(l1_ttable) l1_link; 578 579 /* Entry on the L1 Least Recently Used list */ 580 TAILQ_ENTRY(l1_ttable) l1_lru; 581 582 /* Track how many domains are allocated from this L1 */ 583 volatile u_int l1_domain_use_count; 584 585 /* 586 * A free-list of domain numbers for this L1. 587 * We avoid using ffs() and a bitmap to track domains since ffs() 588 * is slow on ARM. 589 */ 590 uint8_t l1_domain_first; 591 uint8_t l1_domain_free[PMAP_DOMAINS]; 592 593 /* Physical address of this L1 page table */ 594 paddr_t l1_physaddr; 595 596 /* KVA of this L1 page table */ 597 pd_entry_t *l1_kva; 598 }; 599 600 /* 601 * L1 Page Tables are tracked using a Least Recently Used list. 602 * - New L1s are allocated from the HEAD. 603 * - Freed L1s are added to the TAIl. 604 * - Recently accessed L1s (where an 'access' is some change to one of 605 * the userland pmaps which owns this L1) are moved to the TAIL. 606 */ 607 static TAILQ_HEAD(, l1_ttable) l1_lru_list; 608 static kmutex_t l1_lru_lock __cacheline_aligned; 609 610 /* 611 * A list of all L1 tables 612 */ 613 static SLIST_HEAD(, l1_ttable) l1_list; 614 #endif /* ARM_MMU_EXTENDED */ 615 616 /* 617 * The l2_dtable tracks L2_BUCKET_SIZE worth of L1 slots. 618 * 619 * This is normally 16MB worth L2 page descriptors for any given pmap. 620 * Reference counts are maintained for L2 descriptors so they can be 621 * freed when empty. 622 */ 623 struct l2_bucket { 624 pt_entry_t *l2b_kva; /* KVA of L2 Descriptor Table */ 625 paddr_t l2b_pa; /* Physical address of same */ 626 u_short l2b_l1slot; /* This L2 table's L1 index */ 627 u_short l2b_occupancy; /* How many active descriptors */ 628 }; 629 630 struct l2_dtable { 631 /* The number of L2 page descriptors allocated to this l2_dtable */ 632 u_int l2_occupancy; 633 634 /* List of L2 page descriptors */ 635 struct l2_bucket l2_bucket[L2_BUCKET_SIZE]; 636 }; 637 638 /* 639 * Given an L1 table index, calculate the corresponding l2_dtable index 640 * and bucket index within the l2_dtable. 641 */ 642 #define L2_BUCKET_XSHIFT (L2_BUCKET_XLOG2 - L1_S_SHIFT) 643 #define L2_BUCKET_XFRAME (~(vaddr_t)0 << L2_BUCKET_XLOG2) 644 #define L2_BUCKET_IDX(l1slot) ((l1slot) >> L2_BUCKET_XSHIFT) 645 #define L2_IDX(l1slot) (L2_BUCKET_IDX(l1slot) >> L2_BUCKET_LOG2) 646 #define L2_BUCKET(l1slot) (L2_BUCKET_IDX(l1slot) & (L2_BUCKET_SIZE - 1)) 647 648 __CTASSERT(0x100000000ULL == ((uint64_t)L2_SIZE * L2_BUCKET_SIZE * L1_S_SIZE)); 649 __CTASSERT(L2_BUCKET_XFRAME == ~(L2_BUCKET_XSIZE-1)); 650 651 /* 652 * Given a virtual address, this macro returns the 653 * virtual address required to drop into the next L2 bucket. 654 */ 655 #define L2_NEXT_BUCKET_VA(va) (((va) & L2_BUCKET_XFRAME) + L2_BUCKET_XSIZE) 656 657 /* 658 * L2 allocation. 659 */ 660 #define pmap_alloc_l2_dtable() \ 661 pool_cache_get(&pmap_l2dtable_cache, PR_NOWAIT) 662 #define pmap_free_l2_dtable(l2) \ 663 pool_cache_put(&pmap_l2dtable_cache, (l2)) 664 #define pmap_alloc_l2_ptp(pap) \ 665 ((pt_entry_t *)pool_cache_get_paddr(&pmap_l2ptp_cache,\ 666 PR_NOWAIT, (pap))) 667 668 /* 669 * We try to map the page tables write-through, if possible. However, not 670 * all CPUs have a write-through cache mode, so on those we have to sync 671 * the cache when we frob page tables. 672 * 673 * We try to evaluate this at compile time, if possible. However, it's 674 * not always possible to do that, hence this run-time var. 675 */ 676 int pmap_needs_pte_sync; 677 678 /* 679 * Real definition of pv_entry. 680 */ 681 struct pv_entry { 682 SLIST_ENTRY(pv_entry) pv_link; /* next pv_entry */ 683 pmap_t pv_pmap; /* pmap where mapping lies */ 684 vaddr_t pv_va; /* virtual address for mapping */ 685 u_int pv_flags; /* flags */ 686 }; 687 688 /* 689 * Macros to determine if a mapping might be resident in the 690 * instruction/data cache and/or TLB 691 */ 692 #if ARM_MMU_V7 > 0 && !defined(ARM_MMU_EXTENDED) 693 /* 694 * Speculative loads by Cortex cores can cause TLB entries to be filled even if 695 * there are no explicit accesses, so there may be always be TLB entries to 696 * flush. If we used ASIDs then this would not be a problem. 697 */ 698 #define PV_BEEN_EXECD(f) (((f) & PVF_EXEC) == PVF_EXEC) 699 #define PV_BEEN_REFD(f) (true) 700 #else 701 #define PV_BEEN_EXECD(f) (((f) & (PVF_REF | PVF_EXEC)) == (PVF_REF | PVF_EXEC)) 702 #define PV_BEEN_REFD(f) (((f) & PVF_REF) != 0) 703 #endif 704 #define PV_IS_EXEC_P(f) (((f) & PVF_EXEC) != 0) 705 #define PV_IS_KENTRY_P(f) (((f) & PVF_KENTRY) != 0) 706 #define PV_IS_WRITE_P(f) (((f) & PVF_WRITE) != 0) 707 708 /* 709 * Local prototypes 710 */ 711 static bool pmap_set_pt_cache_mode(pd_entry_t *, vaddr_t, size_t); 712 static void pmap_alloc_specials(vaddr_t *, int, vaddr_t *, 713 pt_entry_t **); 714 static bool pmap_is_current(pmap_t) __unused; 715 static bool pmap_is_cached(pmap_t); 716 static void pmap_enter_pv(struct vm_page_md *, paddr_t, struct pv_entry *, 717 pmap_t, vaddr_t, u_int); 718 static struct pv_entry *pmap_find_pv(struct vm_page_md *, pmap_t, vaddr_t); 719 static struct pv_entry *pmap_remove_pv(struct vm_page_md *, paddr_t, pmap_t, vaddr_t); 720 static u_int pmap_modify_pv(struct vm_page_md *, paddr_t, pmap_t, vaddr_t, 721 u_int, u_int); 722 723 static void pmap_pinit(pmap_t); 724 static int pmap_pmap_ctor(void *, void *, int); 725 726 static void pmap_alloc_l1(pmap_t); 727 static void pmap_free_l1(pmap_t); 728 #ifndef ARM_MMU_EXTENDED 729 static void pmap_use_l1(pmap_t); 730 #endif 731 732 static struct l2_bucket *pmap_get_l2_bucket(pmap_t, vaddr_t); 733 static struct l2_bucket *pmap_alloc_l2_bucket(pmap_t, vaddr_t); 734 static void pmap_free_l2_bucket(pmap_t, struct l2_bucket *, u_int); 735 static int pmap_l2ptp_ctor(void *, void *, int); 736 static int pmap_l2dtable_ctor(void *, void *, int); 737 738 static void pmap_vac_me_harder(struct vm_page_md *, paddr_t, pmap_t, vaddr_t); 739 #ifdef PMAP_CACHE_VIVT 740 static void pmap_vac_me_kpmap(struct vm_page_md *, paddr_t, pmap_t, vaddr_t); 741 static void pmap_vac_me_user(struct vm_page_md *, paddr_t, pmap_t, vaddr_t); 742 #endif 743 744 static void pmap_clearbit(struct vm_page_md *, paddr_t, u_int); 745 #ifdef PMAP_CACHE_VIVT 746 static bool pmap_clean_page(struct vm_page_md *, bool); 747 #endif 748 #ifdef PMAP_CACHE_VIPT 749 static void pmap_syncicache_page(struct vm_page_md *, paddr_t); 750 enum pmap_flush_op { 751 PMAP_FLUSH_PRIMARY, 752 PMAP_FLUSH_SECONDARY, 753 PMAP_CLEAN_PRIMARY 754 }; 755 #ifndef ARM_MMU_EXTENDED 756 static void pmap_flush_page(struct vm_page_md *, paddr_t, enum pmap_flush_op); 757 #endif 758 #endif 759 static void pmap_page_remove(struct vm_page_md *, paddr_t); 760 static void pmap_pv_remove(paddr_t); 761 762 #ifndef ARM_MMU_EXTENDED 763 static void pmap_init_l1(struct l1_ttable *, pd_entry_t *); 764 #endif 765 static vaddr_t kernel_pt_lookup(paddr_t); 766 767 768 /* 769 * Misc variables 770 */ 771 vaddr_t virtual_avail; 772 vaddr_t virtual_end; 773 vaddr_t pmap_curmaxkvaddr; 774 775 paddr_t avail_start; 776 paddr_t avail_end; 777 778 pv_addrqh_t pmap_boot_freeq = SLIST_HEAD_INITIALIZER(&pmap_boot_freeq); 779 pv_addr_t kernelpages; 780 pv_addr_t kernel_l1pt; 781 pv_addr_t systempage; 782 783 /* Function to set the debug level of the pmap code */ 784 785 #ifdef PMAP_DEBUG 786 void 787 pmap_debug(int level) 788 { 789 pmap_debug_level = level; 790 printf("pmap_debug: level=%d\n", pmap_debug_level); 791 } 792 #endif /* PMAP_DEBUG */ 793 794 #ifdef PMAP_CACHE_VIPT 795 #define PMAP_VALIDATE_MD_PAGE(md) \ 796 KASSERTMSG(arm_cache_prefer_mask == 0 || (((md)->pvh_attrs & PVF_WRITE) == 0) == ((md)->urw_mappings + (md)->krw_mappings == 0), \ 797 "(md) %p: attrs=%#x urw=%u krw=%u", (md), \ 798 (md)->pvh_attrs, (md)->urw_mappings, (md)->krw_mappings); 799 #endif /* PMAP_CACHE_VIPT */ 800 /* 801 * A bunch of routines to conditionally flush the caches/TLB depending 802 * on whether the specified pmap actually needs to be flushed at any 803 * given time. 804 */ 805 static inline void 806 pmap_tlb_flush_SE(pmap_t pm, vaddr_t va, u_int flags) 807 { 808 #ifdef ARM_MMU_EXTENDED 809 pmap_tlb_invalidate_addr(pm, va); 810 #else 811 if (pm->pm_cstate.cs_tlb_id != 0) { 812 if (PV_BEEN_EXECD(flags)) { 813 cpu_tlb_flushID_SE(va); 814 } else if (PV_BEEN_REFD(flags)) { 815 cpu_tlb_flushD_SE(va); 816 } 817 } 818 #endif /* ARM_MMU_EXTENDED */ 819 } 820 821 static inline void 822 pmap_tlb_flushID(pmap_t pm) 823 { 824 #ifdef ARM_MMU_EXTENDED 825 pmap_tlb_asid_release_all(pm); 826 #else 827 if (pm->pm_cstate.cs_tlb_id) { 828 cpu_tlb_flushID(); 829 #if ARM_MMU_V7 == 0 830 /* 831 * Speculative loads by Cortex cores can cause TLB entries to 832 * be filled even if there are no explicit accesses, so there 833 * may be always be TLB entries to flush. If we used ASIDs 834 * then it would not be a problem. 835 * This is not true for other CPUs. 836 */ 837 pm->pm_cstate.cs_tlb = 0; 838 #endif /* ARM_MMU_V7 */ 839 } 840 #endif /* ARM_MMU_EXTENDED */ 841 } 842 843 #ifndef ARM_MMU_EXTENDED 844 static inline void 845 pmap_tlb_flushD(pmap_t pm) 846 { 847 if (pm->pm_cstate.cs_tlb_d) { 848 cpu_tlb_flushD(); 849 #if ARM_MMU_V7 == 0 850 /* 851 * Speculative loads by Cortex cores can cause TLB entries to 852 * be filled even if there are no explicit accesses, so there 853 * may be always be TLB entries to flush. If we used ASIDs 854 * then it would not be a problem. 855 * This is not true for other CPUs. 856 */ 857 pm->pm_cstate.cs_tlb_d = 0; 858 #endif /* ARM_MMU_V7 */ 859 } 860 } 861 #endif /* ARM_MMU_EXTENDED */ 862 863 #ifdef PMAP_CACHE_VIVT 864 static inline void 865 pmap_cache_wbinv_page(pmap_t pm, vaddr_t va, bool do_inv, u_int flags) 866 { 867 if (PV_BEEN_EXECD(flags) && pm->pm_cstate.cs_cache_id) { 868 cpu_idcache_wbinv_range(va, PAGE_SIZE); 869 } else if (PV_BEEN_REFD(flags) && pm->pm_cstate.cs_cache_d) { 870 if (do_inv) { 871 if (flags & PVF_WRITE) 872 cpu_dcache_wbinv_range(va, PAGE_SIZE); 873 else 874 cpu_dcache_inv_range(va, PAGE_SIZE); 875 } else if (flags & PVF_WRITE) { 876 cpu_dcache_wb_range(va, PAGE_SIZE); 877 } 878 } 879 } 880 881 static inline void 882 pmap_cache_wbinv_all(pmap_t pm, u_int flags) 883 { 884 if (PV_BEEN_EXECD(flags)) { 885 if (pm->pm_cstate.cs_cache_id) { 886 cpu_idcache_wbinv_all(); 887 pm->pm_cstate.cs_cache = 0; 888 } 889 } else if (pm->pm_cstate.cs_cache_d) { 890 cpu_dcache_wbinv_all(); 891 pm->pm_cstate.cs_cache_d = 0; 892 } 893 } 894 #endif /* PMAP_CACHE_VIVT */ 895 896 static inline uint8_t 897 pmap_domain(pmap_t pm) 898 { 899 #ifdef ARM_MMU_EXTENDED 900 return pm == pmap_kernel() ? PMAP_DOMAIN_KERNEL : PMAP_DOMAIN_USER; 901 #else 902 return pm->pm_domain; 903 #endif 904 } 905 906 static inline pd_entry_t * 907 pmap_l1_kva(pmap_t pm) 908 { 909 #ifdef ARM_MMU_EXTENDED 910 return pm->pm_l1; 911 #else 912 return pm->pm_l1->l1_kva; 913 #endif 914 } 915 916 static inline bool 917 pmap_is_current(pmap_t pm) 918 { 919 if (pm == pmap_kernel() || curproc->p_vmspace->vm_map.pmap == pm) 920 return true; 921 922 return false; 923 } 924 925 static inline bool 926 pmap_is_cached(pmap_t pm) 927 { 928 #ifdef ARM_MMU_EXTENDED 929 if (pm == pmap_kernel()) 930 return true; 931 #ifdef MULTIPROCESSOR 932 // Is this pmap active on any CPU? 933 if (!kcpuset_iszero(pm->pm_active)) 934 return true; 935 #else 936 struct pmap_tlb_info * const ti = cpu_tlb_info(curcpu()); 937 // Is this pmap active? 938 if (PMAP_PAI_ASIDVALID_P(PMAP_PAI(pm, ti), ti)) 939 return true; 940 #endif 941 #else 942 struct cpu_info * const ci = curcpu(); 943 if (pm == pmap_kernel() || ci->ci_pmap_lastuser == NULL 944 || ci->ci_pmap_lastuser == pm) 945 return true; 946 #endif /* ARM_MMU_EXTENDED */ 947 948 return false; 949 } 950 951 /* 952 * PTE_SYNC_CURRENT: 953 * 954 * Make sure the pte is written out to RAM. 955 * We need to do this for one of two cases: 956 * - We're dealing with the kernel pmap 957 * - There is no pmap active in the cache/tlb. 958 * - The specified pmap is 'active' in the cache/tlb. 959 */ 960 961 static inline void 962 pmap_pte_sync_current(pmap_t pm, pt_entry_t *ptep) 963 { 964 if (PMAP_NEEDS_PTE_SYNC && pmap_is_cached(pm)) 965 PTE_SYNC(ptep); 966 arm_dsb(); 967 } 968 969 #ifdef PMAP_INCLUDE_PTE_SYNC 970 #define PTE_SYNC_CURRENT(pm, ptep) pmap_pte_sync_current(pm, ptep) 971 #else 972 #define PTE_SYNC_CURRENT(pm, ptep) /* nothing */ 973 #endif 974 975 /* 976 * main pv_entry manipulation functions: 977 * pmap_enter_pv: enter a mapping onto a vm_page list 978 * pmap_remove_pv: remove a mapping from a vm_page list 979 * 980 * NOTE: pmap_enter_pv expects to lock the pvh itself 981 * pmap_remove_pv expects the caller to lock the pvh before calling 982 */ 983 984 /* 985 * pmap_enter_pv: enter a mapping onto a vm_page lst 986 * 987 * => caller should hold the proper lock on pmap_main_lock 988 * => caller should have pmap locked 989 * => we will gain the lock on the vm_page and allocate the new pv_entry 990 * => caller should adjust ptp's wire_count before calling 991 * => caller should not adjust pmap's wire_count 992 */ 993 static void 994 pmap_enter_pv(struct vm_page_md *md, paddr_t pa, struct pv_entry *pv, pmap_t pm, 995 vaddr_t va, u_int flags) 996 { 997 struct pv_entry **pvp; 998 999 NPDEBUG(PDB_PVDUMP, 1000 printf("pmap_enter_pv: pm %p, md %p, flags 0x%x\n", pm, md, flags)); 1001 1002 pv->pv_pmap = pm; 1003 pv->pv_va = va; 1004 pv->pv_flags = flags; 1005 1006 pvp = &SLIST_FIRST(&md->pvh_list); 1007 #ifdef PMAP_CACHE_VIPT 1008 /* 1009 * Insert unmanaged entries, writeable first, at the head of 1010 * the pv list. 1011 */ 1012 if (__predict_true(!PV_IS_KENTRY_P(flags))) { 1013 while (*pvp != NULL && PV_IS_KENTRY_P((*pvp)->pv_flags)) 1014 pvp = &SLIST_NEXT(*pvp, pv_link); 1015 } 1016 if (!PV_IS_WRITE_P(flags)) { 1017 while (*pvp != NULL && PV_IS_WRITE_P((*pvp)->pv_flags)) 1018 pvp = &SLIST_NEXT(*pvp, pv_link); 1019 } 1020 #endif 1021 SLIST_NEXT(pv, pv_link) = *pvp; /* add to ... */ 1022 *pvp = pv; /* ... locked list */ 1023 md->pvh_attrs |= flags & (PVF_REF | PVF_MOD); 1024 #if defined(PMAP_CACHE_VIPT) && !defined(ARM_MMU_EXTENDED) 1025 if ((pv->pv_flags & PVF_KWRITE) == PVF_KWRITE) 1026 md->pvh_attrs |= PVF_KMOD; 1027 if ((md->pvh_attrs & (PVF_DMOD|PVF_NC)) != PVF_NC) 1028 md->pvh_attrs |= PVF_DIRTY; 1029 KASSERT((md->pvh_attrs & PVF_DMOD) == 0 || (md->pvh_attrs & (PVF_DIRTY|PVF_NC))); 1030 #endif 1031 if (pm == pmap_kernel()) { 1032 PMAPCOUNT(kernel_mappings); 1033 if (flags & PVF_WRITE) 1034 md->krw_mappings++; 1035 else 1036 md->kro_mappings++; 1037 } else { 1038 if (flags & PVF_WRITE) 1039 md->urw_mappings++; 1040 else 1041 md->uro_mappings++; 1042 } 1043 1044 #ifdef PMAP_CACHE_VIPT 1045 #ifndef ARM_MMU_EXTENDED 1046 /* 1047 * Even though pmap_vac_me_harder will set PVF_WRITE for us, 1048 * do it here as well to keep the mappings & KVF_WRITE consistent. 1049 */ 1050 if (arm_cache_prefer_mask != 0 && (flags & PVF_WRITE) != 0) { 1051 md->pvh_attrs |= PVF_WRITE; 1052 } 1053 #endif 1054 /* 1055 * If this is an exec mapping and its the first exec mapping 1056 * for this page, make sure to sync the I-cache. 1057 */ 1058 if (PV_IS_EXEC_P(flags)) { 1059 #ifndef ARM_MMU_EXTENDED 1060 if (!PV_IS_EXEC_P(md->pvh_attrs)) { 1061 pmap_syncicache_page(md, pa); 1062 PMAPCOUNT(exec_synced_map); 1063 } 1064 #endif 1065 PMAPCOUNT(exec_mappings); 1066 } 1067 #endif 1068 1069 PMAPCOUNT(mappings); 1070 1071 if (pv->pv_flags & PVF_WIRED) 1072 ++pm->pm_stats.wired_count; 1073 } 1074 1075 /* 1076 * 1077 * pmap_find_pv: Find a pv entry 1078 * 1079 * => caller should hold lock on vm_page 1080 */ 1081 static inline struct pv_entry * 1082 pmap_find_pv(struct vm_page_md *md, pmap_t pm, vaddr_t va) 1083 { 1084 struct pv_entry *pv; 1085 1086 SLIST_FOREACH(pv, &md->pvh_list, pv_link) { 1087 if (pm == pv->pv_pmap && va == pv->pv_va) 1088 break; 1089 } 1090 1091 return (pv); 1092 } 1093 1094 /* 1095 * pmap_remove_pv: try to remove a mapping from a pv_list 1096 * 1097 * => caller should hold proper lock on pmap_main_lock 1098 * => pmap should be locked 1099 * => caller should hold lock on vm_page [so that attrs can be adjusted] 1100 * => caller should adjust ptp's wire_count and free PTP if needed 1101 * => caller should NOT adjust pmap's wire_count 1102 * => we return the removed pv 1103 */ 1104 static struct pv_entry * 1105 pmap_remove_pv(struct vm_page_md *md, paddr_t pa, pmap_t pm, vaddr_t va) 1106 { 1107 struct pv_entry *pv, **prevptr; 1108 1109 NPDEBUG(PDB_PVDUMP, 1110 printf("pmap_remove_pv: pm %p, md %p, va 0x%08lx\n", pm, md, va)); 1111 1112 prevptr = &SLIST_FIRST(&md->pvh_list); /* prev pv_entry ptr */ 1113 pv = *prevptr; 1114 1115 while (pv) { 1116 if (pv->pv_pmap == pm && pv->pv_va == va) { /* match? */ 1117 NPDEBUG(PDB_PVDUMP, printf("pmap_remove_pv: pm %p, md " 1118 "%p, flags 0x%x\n", pm, md, pv->pv_flags)); 1119 if (pv->pv_flags & PVF_WIRED) { 1120 --pm->pm_stats.wired_count; 1121 } 1122 *prevptr = SLIST_NEXT(pv, pv_link); /* remove it! */ 1123 if (pm == pmap_kernel()) { 1124 PMAPCOUNT(kernel_unmappings); 1125 if (pv->pv_flags & PVF_WRITE) 1126 md->krw_mappings--; 1127 else 1128 md->kro_mappings--; 1129 } else { 1130 if (pv->pv_flags & PVF_WRITE) 1131 md->urw_mappings--; 1132 else 1133 md->uro_mappings--; 1134 } 1135 1136 PMAPCOUNT(unmappings); 1137 #ifdef PMAP_CACHE_VIPT 1138 if (!(pv->pv_flags & PVF_WRITE)) 1139 break; 1140 /* 1141 * If this page has had an exec mapping, then if 1142 * this was the last mapping, discard the contents, 1143 * otherwise sync the i-cache for this page. 1144 */ 1145 if (PV_IS_EXEC_P(md->pvh_attrs)) { 1146 #ifdef ARM_MMU_EXTENDED 1147 md->pvh_attrs &= ~PVF_EXEC; 1148 PMAPCOUNT(exec_discarded_unmap); 1149 #else 1150 if (SLIST_EMPTY(&md->pvh_list)) { 1151 md->pvh_attrs &= ~PVF_EXEC; 1152 PMAPCOUNT(exec_discarded_unmap); 1153 } else { 1154 pmap_syncicache_page(md, pa); 1155 PMAPCOUNT(exec_synced_unmap); 1156 } 1157 #endif /* ARM_MMU_EXTENDED */ 1158 } 1159 #endif /* PMAP_CACHE_VIPT */ 1160 break; 1161 } 1162 prevptr = &SLIST_NEXT(pv, pv_link); /* previous pointer */ 1163 pv = *prevptr; /* advance */ 1164 } 1165 1166 #if defined(PMAP_CACHE_VIPT) && !defined(ARM_MMU_EXTENDED) 1167 /* 1168 * If we no longer have a WRITEABLE KENTRY at the head of list, 1169 * clear the KMOD attribute from the page. 1170 */ 1171 if (SLIST_FIRST(&md->pvh_list) == NULL 1172 || (SLIST_FIRST(&md->pvh_list)->pv_flags & PVF_KWRITE) != PVF_KWRITE) 1173 md->pvh_attrs &= ~PVF_KMOD; 1174 1175 /* 1176 * If this was a writeable page and there are no more writeable 1177 * mappings (ignoring KMPAGE), clear the WRITE flag and writeback 1178 * the contents to memory. 1179 */ 1180 if (arm_cache_prefer_mask != 0) { 1181 if (md->krw_mappings + md->urw_mappings == 0) 1182 md->pvh_attrs &= ~PVF_WRITE; 1183 PMAP_VALIDATE_MD_PAGE(md); 1184 } 1185 KASSERT((md->pvh_attrs & PVF_DMOD) == 0 || (md->pvh_attrs & (PVF_DIRTY|PVF_NC))); 1186 #endif /* PMAP_CACHE_VIPT && !ARM_MMU_EXTENDED */ 1187 1188 return(pv); /* return removed pv */ 1189 } 1190 1191 /* 1192 * 1193 * pmap_modify_pv: Update pv flags 1194 * 1195 * => caller should hold lock on vm_page [so that attrs can be adjusted] 1196 * => caller should NOT adjust pmap's wire_count 1197 * => caller must call pmap_vac_me_harder() if writable status of a page 1198 * may have changed. 1199 * => we return the old flags 1200 * 1201 * Modify a physical-virtual mapping in the pv table 1202 */ 1203 static u_int 1204 pmap_modify_pv(struct vm_page_md *md, paddr_t pa, pmap_t pm, vaddr_t va, 1205 u_int clr_mask, u_int set_mask) 1206 { 1207 struct pv_entry *npv; 1208 u_int flags, oflags; 1209 1210 KASSERT(!PV_IS_KENTRY_P(clr_mask)); 1211 KASSERT(!PV_IS_KENTRY_P(set_mask)); 1212 1213 if ((npv = pmap_find_pv(md, pm, va)) == NULL) 1214 return (0); 1215 1216 NPDEBUG(PDB_PVDUMP, 1217 printf("pmap_modify_pv: pm %p, md %p, clr 0x%x, set 0x%x, flags 0x%x\n", pm, md, clr_mask, set_mask, npv->pv_flags)); 1218 1219 /* 1220 * There is at least one VA mapping this page. 1221 */ 1222 1223 if (clr_mask & (PVF_REF | PVF_MOD)) { 1224 md->pvh_attrs |= set_mask & (PVF_REF | PVF_MOD); 1225 #if defined(PMAP_CACHE_VIPT) && !defined(ARM_MMU_EXTENDED) 1226 if ((md->pvh_attrs & (PVF_DMOD|PVF_NC)) != PVF_NC) 1227 md->pvh_attrs |= PVF_DIRTY; 1228 KASSERT((md->pvh_attrs & PVF_DMOD) == 0 || (md->pvh_attrs & (PVF_DIRTY|PVF_NC))); 1229 #endif /* PMAP_CACHE_VIPT && !ARM_MMU_EXTENDED */ 1230 } 1231 1232 oflags = npv->pv_flags; 1233 npv->pv_flags = flags = (oflags & ~clr_mask) | set_mask; 1234 1235 if ((flags ^ oflags) & PVF_WIRED) { 1236 if (flags & PVF_WIRED) 1237 ++pm->pm_stats.wired_count; 1238 else 1239 --pm->pm_stats.wired_count; 1240 } 1241 1242 if ((flags ^ oflags) & PVF_WRITE) { 1243 if (pm == pmap_kernel()) { 1244 if (flags & PVF_WRITE) { 1245 md->krw_mappings++; 1246 md->kro_mappings--; 1247 } else { 1248 md->kro_mappings++; 1249 md->krw_mappings--; 1250 } 1251 } else { 1252 if (flags & PVF_WRITE) { 1253 md->urw_mappings++; 1254 md->uro_mappings--; 1255 } else { 1256 md->uro_mappings++; 1257 md->urw_mappings--; 1258 } 1259 } 1260 } 1261 #ifdef PMAP_CACHE_VIPT 1262 if (arm_cache_prefer_mask != 0) { 1263 if (md->urw_mappings + md->krw_mappings == 0) { 1264 md->pvh_attrs &= ~PVF_WRITE; 1265 } else { 1266 md->pvh_attrs |= PVF_WRITE; 1267 } 1268 } 1269 #ifndef ARM_MMU_EXTENDED 1270 /* 1271 * We have two cases here: the first is from enter_pv (new exec 1272 * page), the second is a combined pmap_remove_pv/pmap_enter_pv. 1273 * Since in latter, pmap_enter_pv won't do anything, we just have 1274 * to do what pmap_remove_pv would do. 1275 */ 1276 if ((PV_IS_EXEC_P(flags) && !PV_IS_EXEC_P(md->pvh_attrs)) 1277 || (PV_IS_EXEC_P(md->pvh_attrs) 1278 || (!(flags & PVF_WRITE) && (oflags & PVF_WRITE)))) { 1279 pmap_syncicache_page(md, pa); 1280 PMAPCOUNT(exec_synced_remap); 1281 } 1282 KASSERT((md->pvh_attrs & PVF_DMOD) == 0 || (md->pvh_attrs & (PVF_DIRTY|PVF_NC))); 1283 #endif /* !ARM_MMU_EXTENDED */ 1284 #endif /* PMAP_CACHE_VIPT */ 1285 1286 PMAPCOUNT(remappings); 1287 1288 return (oflags); 1289 } 1290 1291 /* 1292 * Allocate an L1 translation table for the specified pmap. 1293 * This is called at pmap creation time. 1294 */ 1295 static void 1296 pmap_alloc_l1(pmap_t pm) 1297 { 1298 #ifdef ARM_MMU_EXTENDED 1299 #ifdef __HAVE_MM_MD_DIRECT_MAPPED_PHYS 1300 struct vm_page *pg; 1301 bool ok __diagused; 1302 for (;;) { 1303 #ifdef PMAP_NEED_ALLOC_POOLPAGE 1304 pg = arm_pmap_alloc_poolpage(UVM_PGA_ZERO); 1305 #else 1306 pg = uvm_pagealloc(NULL, 0, NULL, UVM_PGA_ZERO); 1307 #endif 1308 if (pg != NULL) 1309 break; 1310 uvm_wait("pmapl1alloc"); 1311 } 1312 pm->pm_l1_pa = VM_PAGE_TO_PHYS(pg); 1313 vaddr_t va = pmap_direct_mapped_phys(pm->pm_l1_pa, &ok, 0); 1314 KASSERT(ok); 1315 KASSERT(va >= KERNEL_BASE); 1316 1317 #else 1318 KASSERTMSG(kernel_map != NULL, "pm %p", pm); 1319 vaddr_t va = uvm_km_alloc(kernel_map, PAGE_SIZE, 0, 1320 UVM_KMF_WIRED|UVM_KMF_ZERO); 1321 KASSERT(va); 1322 pmap_extract(pmap_kernel(), va, &pm->pm_l1_pa); 1323 #endif 1324 pm->pm_l1 = (pd_entry_t *)va; 1325 PTE_SYNC_RANGE(pm->pm_l1, PAGE_SIZE / sizeof(pt_entry_t)); 1326 #else 1327 struct l1_ttable *l1; 1328 uint8_t domain; 1329 1330 /* 1331 * Remove the L1 at the head of the LRU list 1332 */ 1333 mutex_spin_enter(&l1_lru_lock); 1334 l1 = TAILQ_FIRST(&l1_lru_list); 1335 KDASSERT(l1 != NULL); 1336 TAILQ_REMOVE(&l1_lru_list, l1, l1_lru); 1337 1338 /* 1339 * Pick the first available domain number, and update 1340 * the link to the next number. 1341 */ 1342 domain = l1->l1_domain_first; 1343 l1->l1_domain_first = l1->l1_domain_free[domain]; 1344 1345 /* 1346 * If there are still free domain numbers in this L1, 1347 * put it back on the TAIL of the LRU list. 1348 */ 1349 if (++l1->l1_domain_use_count < PMAP_DOMAINS) 1350 TAILQ_INSERT_TAIL(&l1_lru_list, l1, l1_lru); 1351 1352 mutex_spin_exit(&l1_lru_lock); 1353 1354 /* 1355 * Fix up the relevant bits in the pmap structure 1356 */ 1357 pm->pm_l1 = l1; 1358 pm->pm_domain = domain + 1; 1359 #endif 1360 } 1361 1362 /* 1363 * Free an L1 translation table. 1364 * This is called at pmap destruction time. 1365 */ 1366 static void 1367 pmap_free_l1(pmap_t pm) 1368 { 1369 #ifdef ARM_MMU_EXTENDED 1370 #ifdef __HAVE_MM_MD_DIRECT_MAPPED_PHYS 1371 struct vm_page *pg = PHYS_TO_VM_PAGE(pm->pm_l1_pa); 1372 uvm_pagefree(pg); 1373 #else 1374 uvm_km_free(kernel_map, (vaddr_t)pm->pm_l1, PAGE_SIZE, UVM_KMF_WIRED); 1375 #endif 1376 pm->pm_l1 = NULL; 1377 pm->pm_l1_pa = 0; 1378 #else 1379 struct l1_ttable *l1 = pm->pm_l1; 1380 1381 mutex_spin_enter(&l1_lru_lock); 1382 1383 /* 1384 * If this L1 is currently on the LRU list, remove it. 1385 */ 1386 if (l1->l1_domain_use_count < PMAP_DOMAINS) 1387 TAILQ_REMOVE(&l1_lru_list, l1, l1_lru); 1388 1389 /* 1390 * Free up the domain number which was allocated to the pmap 1391 */ 1392 l1->l1_domain_free[pmap_domain(pm) - 1] = l1->l1_domain_first; 1393 l1->l1_domain_first = pmap_domain(pm) - 1; 1394 l1->l1_domain_use_count--; 1395 1396 /* 1397 * The L1 now must have at least 1 free domain, so add 1398 * it back to the LRU list. If the use count is zero, 1399 * put it at the head of the list, otherwise it goes 1400 * to the tail. 1401 */ 1402 if (l1->l1_domain_use_count == 0) 1403 TAILQ_INSERT_HEAD(&l1_lru_list, l1, l1_lru); 1404 else 1405 TAILQ_INSERT_TAIL(&l1_lru_list, l1, l1_lru); 1406 1407 mutex_spin_exit(&l1_lru_lock); 1408 #endif /* ARM_MMU_EXTENDED */ 1409 } 1410 1411 #ifndef ARM_MMU_EXTENDED 1412 static inline void 1413 pmap_use_l1(pmap_t pm) 1414 { 1415 struct l1_ttable *l1; 1416 1417 /* 1418 * Do nothing if we're in interrupt context. 1419 * Access to an L1 by the kernel pmap must not affect 1420 * the LRU list. 1421 */ 1422 if (cpu_intr_p() || pm == pmap_kernel()) 1423 return; 1424 1425 l1 = pm->pm_l1; 1426 1427 /* 1428 * If the L1 is not currently on the LRU list, just return 1429 */ 1430 if (l1->l1_domain_use_count == PMAP_DOMAINS) 1431 return; 1432 1433 mutex_spin_enter(&l1_lru_lock); 1434 1435 /* 1436 * Check the use count again, now that we've acquired the lock 1437 */ 1438 if (l1->l1_domain_use_count == PMAP_DOMAINS) { 1439 mutex_spin_exit(&l1_lru_lock); 1440 return; 1441 } 1442 1443 /* 1444 * Move the L1 to the back of the LRU list 1445 */ 1446 TAILQ_REMOVE(&l1_lru_list, l1, l1_lru); 1447 TAILQ_INSERT_TAIL(&l1_lru_list, l1, l1_lru); 1448 1449 mutex_spin_exit(&l1_lru_lock); 1450 } 1451 #endif /* !ARM_MMU_EXTENDED */ 1452 1453 /* 1454 * void pmap_free_l2_ptp(pt_entry_t *, paddr_t *) 1455 * 1456 * Free an L2 descriptor table. 1457 */ 1458 static inline void 1459 #if defined(PMAP_INCLUDE_PTE_SYNC) && defined(PMAP_CACHE_VIVT) 1460 pmap_free_l2_ptp(bool need_sync, pt_entry_t *l2, paddr_t pa) 1461 #else 1462 pmap_free_l2_ptp(pt_entry_t *l2, paddr_t pa) 1463 #endif 1464 { 1465 #if defined(PMAP_INCLUDE_PTE_SYNC) && defined(PMAP_CACHE_VIVT) 1466 /* 1467 * Note: With a write-back cache, we may need to sync this 1468 * L2 table before re-using it. 1469 * This is because it may have belonged to a non-current 1470 * pmap, in which case the cache syncs would have been 1471 * skipped for the pages that were being unmapped. If the 1472 * L2 table were then to be immediately re-allocated to 1473 * the *current* pmap, it may well contain stale mappings 1474 * which have not yet been cleared by a cache write-back 1475 * and so would still be visible to the mmu. 1476 */ 1477 if (need_sync) 1478 PTE_SYNC_RANGE(l2, L2_TABLE_SIZE_REAL / sizeof(pt_entry_t)); 1479 #endif /* PMAP_INCLUDE_PTE_SYNC && PMAP_CACHE_VIVT */ 1480 pool_cache_put_paddr(&pmap_l2ptp_cache, (void *)l2, pa); 1481 } 1482 1483 /* 1484 * Returns a pointer to the L2 bucket associated with the specified pmap 1485 * and VA, or NULL if no L2 bucket exists for the address. 1486 */ 1487 static inline struct l2_bucket * 1488 pmap_get_l2_bucket(pmap_t pm, vaddr_t va) 1489 { 1490 const size_t l1slot = l1pte_index(va); 1491 struct l2_dtable *l2; 1492 struct l2_bucket *l2b; 1493 1494 if ((l2 = pm->pm_l2[L2_IDX(l1slot)]) == NULL || 1495 (l2b = &l2->l2_bucket[L2_BUCKET(l1slot)])->l2b_kva == NULL) 1496 return (NULL); 1497 1498 return (l2b); 1499 } 1500 1501 /* 1502 * Returns a pointer to the L2 bucket associated with the specified pmap 1503 * and VA. 1504 * 1505 * If no L2 bucket exists, perform the necessary allocations to put an L2 1506 * bucket/page table in place. 1507 * 1508 * Note that if a new L2 bucket/page was allocated, the caller *must* 1509 * increment the bucket occupancy counter appropriately *before* 1510 * releasing the pmap's lock to ensure no other thread or cpu deallocates 1511 * the bucket/page in the meantime. 1512 */ 1513 static struct l2_bucket * 1514 pmap_alloc_l2_bucket(pmap_t pm, vaddr_t va) 1515 { 1516 const size_t l1slot = l1pte_index(va); 1517 struct l2_dtable *l2; 1518 1519 if ((l2 = pm->pm_l2[L2_IDX(l1slot)]) == NULL) { 1520 /* 1521 * No mapping at this address, as there is 1522 * no entry in the L1 table. 1523 * Need to allocate a new l2_dtable. 1524 */ 1525 if ((l2 = pmap_alloc_l2_dtable()) == NULL) 1526 return (NULL); 1527 1528 /* 1529 * Link it into the parent pmap 1530 */ 1531 pm->pm_l2[L2_IDX(l1slot)] = l2; 1532 } 1533 1534 struct l2_bucket * const l2b = &l2->l2_bucket[L2_BUCKET(l1slot)]; 1535 1536 /* 1537 * Fetch pointer to the L2 page table associated with the address. 1538 */ 1539 if (l2b->l2b_kva == NULL) { 1540 pt_entry_t *ptep; 1541 1542 /* 1543 * No L2 page table has been allocated. Chances are, this 1544 * is because we just allocated the l2_dtable, above. 1545 */ 1546 if ((ptep = pmap_alloc_l2_ptp(&l2b->l2b_pa)) == NULL) { 1547 /* 1548 * Oops, no more L2 page tables available at this 1549 * time. We may need to deallocate the l2_dtable 1550 * if we allocated a new one above. 1551 */ 1552 if (l2->l2_occupancy == 0) { 1553 pm->pm_l2[L2_IDX(l1slot)] = NULL; 1554 pmap_free_l2_dtable(l2); 1555 } 1556 return (NULL); 1557 } 1558 1559 l2->l2_occupancy++; 1560 l2b->l2b_kva = ptep; 1561 l2b->l2b_l1slot = l1slot; 1562 1563 #ifdef ARM_MMU_EXTENDED 1564 /* 1565 * We know there will be a mapping here, so simply 1566 * enter this PTP into the L1 now. 1567 */ 1568 pd_entry_t * const pdep = pmap_l1_kva(pm) + l1slot; 1569 pd_entry_t npde = L1_C_PROTO | l2b->l2b_pa 1570 | L1_C_DOM(pmap_domain(pm)); 1571 KASSERT(*pdep == 0); 1572 l1pte_setone(pdep, npde); 1573 PDE_SYNC(pdep); 1574 #endif 1575 } 1576 1577 return (l2b); 1578 } 1579 1580 /* 1581 * One or more mappings in the specified L2 descriptor table have just been 1582 * invalidated. 1583 * 1584 * Garbage collect the metadata and descriptor table itself if necessary. 1585 * 1586 * The pmap lock must be acquired when this is called (not necessary 1587 * for the kernel pmap). 1588 */ 1589 static void 1590 pmap_free_l2_bucket(pmap_t pm, struct l2_bucket *l2b, u_int count) 1591 { 1592 KDASSERT(count <= l2b->l2b_occupancy); 1593 1594 /* 1595 * Update the bucket's reference count according to how many 1596 * PTEs the caller has just invalidated. 1597 */ 1598 l2b->l2b_occupancy -= count; 1599 1600 /* 1601 * Note: 1602 * 1603 * Level 2 page tables allocated to the kernel pmap are never freed 1604 * as that would require checking all Level 1 page tables and 1605 * removing any references to the Level 2 page table. See also the 1606 * comment elsewhere about never freeing bootstrap L2 descriptors. 1607 * 1608 * We make do with just invalidating the mapping in the L2 table. 1609 * 1610 * This isn't really a big deal in practice and, in fact, leads 1611 * to a performance win over time as we don't need to continually 1612 * alloc/free. 1613 */ 1614 if (l2b->l2b_occupancy > 0 || pm == pmap_kernel()) 1615 return; 1616 1617 /* 1618 * There are no more valid mappings in this level 2 page table. 1619 * Go ahead and NULL-out the pointer in the bucket, then 1620 * free the page table. 1621 */ 1622 const size_t l1slot = l2b->l2b_l1slot; 1623 pt_entry_t * const ptep = l2b->l2b_kva; 1624 l2b->l2b_kva = NULL; 1625 1626 pd_entry_t * const pdep = pmap_l1_kva(pm) + l1slot; 1627 pd_entry_t pde __diagused = *pdep; 1628 1629 #ifdef ARM_MMU_EXTENDED 1630 /* 1631 * Invalidate the L1 slot. 1632 */ 1633 KASSERT((pde & L1_TYPE_MASK) == L1_TYPE_C); 1634 #else 1635 /* 1636 * If the L1 slot matches the pmap's domain number, then invalidate it. 1637 */ 1638 if ((pde & (L1_C_DOM_MASK|L1_TYPE_MASK)) 1639 == (L1_C_DOM(pmap_domain(pm))|L1_TYPE_C)) { 1640 #endif 1641 l1pte_setone(pdep, 0); 1642 PDE_SYNC(pdep); 1643 #ifndef ARM_MMU_EXTENDED 1644 } 1645 #endif 1646 1647 /* 1648 * Release the L2 descriptor table back to the pool cache. 1649 */ 1650 #if defined(PMAP_INCLUDE_PTE_SYNC) && defined(PMAP_CACHE_VIVT) 1651 pmap_free_l2_ptp(!pmap_is_cached(pm), ptep, l2b->l2b_pa); 1652 #else 1653 pmap_free_l2_ptp(ptep, l2b->l2b_pa); 1654 #endif 1655 1656 /* 1657 * Update the reference count in the associated l2_dtable 1658 */ 1659 struct l2_dtable * const l2 = pm->pm_l2[L2_IDX(l1slot)]; 1660 if (--l2->l2_occupancy > 0) 1661 return; 1662 1663 /* 1664 * There are no more valid mappings in any of the Level 1 1665 * slots managed by this l2_dtable. Go ahead and NULL-out 1666 * the pointer in the parent pmap and free the l2_dtable. 1667 */ 1668 pm->pm_l2[L2_IDX(l1slot)] = NULL; 1669 pmap_free_l2_dtable(l2); 1670 } 1671 1672 /* 1673 * Pool cache constructors for L2 descriptor tables, metadata and pmap 1674 * structures. 1675 */ 1676 static int 1677 pmap_l2ptp_ctor(void *arg, void *v, int flags) 1678 { 1679 #ifndef PMAP_INCLUDE_PTE_SYNC 1680 vaddr_t va = (vaddr_t)v & ~PGOFSET; 1681 1682 /* 1683 * The mappings for these page tables were initially made using 1684 * pmap_kenter_pa() by the pool subsystem. Therefore, the cache- 1685 * mode will not be right for page table mappings. To avoid 1686 * polluting the pmap_kenter_pa() code with a special case for 1687 * page tables, we simply fix up the cache-mode here if it's not 1688 * correct. 1689 */ 1690 if (pte_l2_s_cache_mode != pte_l2_s_cache_mode_pt) { 1691 const struct l2_bucket * const l2b = 1692 pmap_get_l2_bucket(pmap_kernel(), va); 1693 KASSERTMSG(l2b != NULL, "%#lx", va); 1694 pt_entry_t * const ptep = &l2b->l2b_kva[l2pte_index(va)]; 1695 const pt_entry_t opte = *ptep; 1696 1697 if ((opte & L2_S_CACHE_MASK) != pte_l2_s_cache_mode_pt) { 1698 /* 1699 * Page tables must have the cache-mode set correctly. 1700 */ 1701 const pt_entry_t npte = (pte & ~L2_S_CACHE_MASK) 1702 | pte_l2_s_cache_mode_pt; 1703 l2pte_set(ptep, npte, opte); 1704 PTE_SYNC(ptep); 1705 cpu_tlb_flushD_SE(va); 1706 cpu_cpwait(); 1707 } 1708 } 1709 #endif 1710 1711 memset(v, 0, L2_TABLE_SIZE_REAL); 1712 PTE_SYNC_RANGE(v, L2_TABLE_SIZE_REAL / sizeof(pt_entry_t)); 1713 return (0); 1714 } 1715 1716 static int 1717 pmap_l2dtable_ctor(void *arg, void *v, int flags) 1718 { 1719 1720 memset(v, 0, sizeof(struct l2_dtable)); 1721 return (0); 1722 } 1723 1724 static int 1725 pmap_pmap_ctor(void *arg, void *v, int flags) 1726 { 1727 1728 memset(v, 0, sizeof(struct pmap)); 1729 return (0); 1730 } 1731 1732 static void 1733 pmap_pinit(pmap_t pm) 1734 { 1735 #ifndef ARM_HAS_VBAR 1736 struct l2_bucket *l2b; 1737 1738 if (vector_page < KERNEL_BASE) { 1739 /* 1740 * Map the vector page. 1741 */ 1742 pmap_enter(pm, vector_page, systempage.pv_pa, 1743 VM_PROT_READ | VM_PROT_EXECUTE, 1744 VM_PROT_READ | VM_PROT_EXECUTE | PMAP_WIRED); 1745 pmap_update(pm); 1746 1747 pm->pm_pl1vec = pmap_l1_kva(pm) + l1pte_index(vector_page); 1748 l2b = pmap_get_l2_bucket(pm, vector_page); 1749 KASSERTMSG(l2b != NULL, "%#lx", vector_page); 1750 pm->pm_l1vec = l2b->l2b_pa | L1_C_PROTO | 1751 L1_C_DOM(pmap_domain(pm)); 1752 } else 1753 pm->pm_pl1vec = NULL; 1754 #endif 1755 } 1756 1757 #ifdef PMAP_CACHE_VIVT 1758 /* 1759 * Since we have a virtually indexed cache, we may need to inhibit caching if 1760 * there is more than one mapping and at least one of them is writable. 1761 * Since we purge the cache on every context switch, we only need to check for 1762 * other mappings within the same pmap, or kernel_pmap. 1763 * This function is also called when a page is unmapped, to possibly reenable 1764 * caching on any remaining mappings. 1765 * 1766 * The code implements the following logic, where: 1767 * 1768 * KW = # of kernel read/write pages 1769 * KR = # of kernel read only pages 1770 * UW = # of user read/write pages 1771 * UR = # of user read only pages 1772 * 1773 * KC = kernel mapping is cacheable 1774 * UC = user mapping is cacheable 1775 * 1776 * KW=0,KR=0 KW=0,KR>0 KW=1,KR=0 KW>1,KR>=0 1777 * +--------------------------------------------- 1778 * UW=0,UR=0 | --- KC=1 KC=1 KC=0 1779 * UW=0,UR>0 | UC=1 KC=1,UC=1 KC=0,UC=0 KC=0,UC=0 1780 * UW=1,UR=0 | UC=1 KC=0,UC=0 KC=0,UC=0 KC=0,UC=0 1781 * UW>1,UR>=0 | UC=0 KC=0,UC=0 KC=0,UC=0 KC=0,UC=0 1782 */ 1783 1784 static const int pmap_vac_flags[4][4] = { 1785 {-1, 0, 0, PVF_KNC}, 1786 {0, 0, PVF_NC, PVF_NC}, 1787 {0, PVF_NC, PVF_NC, PVF_NC}, 1788 {PVF_UNC, PVF_NC, PVF_NC, PVF_NC} 1789 }; 1790 1791 static inline int 1792 pmap_get_vac_flags(const struct vm_page_md *md) 1793 { 1794 int kidx, uidx; 1795 1796 kidx = 0; 1797 if (md->kro_mappings || md->krw_mappings > 1) 1798 kidx |= 1; 1799 if (md->krw_mappings) 1800 kidx |= 2; 1801 1802 uidx = 0; 1803 if (md->uro_mappings || md->urw_mappings > 1) 1804 uidx |= 1; 1805 if (md->urw_mappings) 1806 uidx |= 2; 1807 1808 return (pmap_vac_flags[uidx][kidx]); 1809 } 1810 1811 static inline void 1812 pmap_vac_me_harder(struct vm_page_md *md, paddr_t pa, pmap_t pm, vaddr_t va) 1813 { 1814 int nattr; 1815 1816 nattr = pmap_get_vac_flags(md); 1817 1818 if (nattr < 0) { 1819 md->pvh_attrs &= ~PVF_NC; 1820 return; 1821 } 1822 1823 if (nattr == 0 && (md->pvh_attrs & PVF_NC) == 0) 1824 return; 1825 1826 if (pm == pmap_kernel()) 1827 pmap_vac_me_kpmap(md, pa, pm, va); 1828 else 1829 pmap_vac_me_user(md, pa, pm, va); 1830 1831 md->pvh_attrs = (md->pvh_attrs & ~PVF_NC) | nattr; 1832 } 1833 1834 static void 1835 pmap_vac_me_kpmap(struct vm_page_md *md, paddr_t pa, pmap_t pm, vaddr_t va) 1836 { 1837 u_int u_cacheable, u_entries; 1838 struct pv_entry *pv; 1839 pmap_t last_pmap = pm; 1840 1841 /* 1842 * Pass one, see if there are both kernel and user pmaps for 1843 * this page. Calculate whether there are user-writable or 1844 * kernel-writable pages. 1845 */ 1846 u_cacheable = 0; 1847 SLIST_FOREACH(pv, &md->pvh_list, pv_link) { 1848 if (pv->pv_pmap != pm && (pv->pv_flags & PVF_NC) == 0) 1849 u_cacheable++; 1850 } 1851 1852 u_entries = md->urw_mappings + md->uro_mappings; 1853 1854 /* 1855 * We know we have just been updating a kernel entry, so if 1856 * all user pages are already cacheable, then there is nothing 1857 * further to do. 1858 */ 1859 if (md->k_mappings == 0 && u_cacheable == u_entries) 1860 return; 1861 1862 if (u_entries) { 1863 /* 1864 * Scan over the list again, for each entry, if it 1865 * might not be set correctly, call pmap_vac_me_user 1866 * to recalculate the settings. 1867 */ 1868 SLIST_FOREACH(pv, &md->pvh_list, pv_link) { 1869 /* 1870 * We know kernel mappings will get set 1871 * correctly in other calls. We also know 1872 * that if the pmap is the same as last_pmap 1873 * then we've just handled this entry. 1874 */ 1875 if (pv->pv_pmap == pm || pv->pv_pmap == last_pmap) 1876 continue; 1877 1878 /* 1879 * If there are kernel entries and this page 1880 * is writable but non-cacheable, then we can 1881 * skip this entry also. 1882 */ 1883 if (md->k_mappings && 1884 (pv->pv_flags & (PVF_NC | PVF_WRITE)) == 1885 (PVF_NC | PVF_WRITE)) 1886 continue; 1887 1888 /* 1889 * Similarly if there are no kernel-writable 1890 * entries and the page is already 1891 * read-only/cacheable. 1892 */ 1893 if (md->krw_mappings == 0 && 1894 (pv->pv_flags & (PVF_NC | PVF_WRITE)) == 0) 1895 continue; 1896 1897 /* 1898 * For some of the remaining cases, we know 1899 * that we must recalculate, but for others we 1900 * can't tell if they are correct or not, so 1901 * we recalculate anyway. 1902 */ 1903 pmap_vac_me_user(md, pa, (last_pmap = pv->pv_pmap), 0); 1904 } 1905 1906 if (md->k_mappings == 0) 1907 return; 1908 } 1909 1910 pmap_vac_me_user(md, pa, pm, va); 1911 } 1912 1913 static void 1914 pmap_vac_me_user(struct vm_page_md *md, paddr_t pa, pmap_t pm, vaddr_t va) 1915 { 1916 pmap_t kpmap = pmap_kernel(); 1917 struct pv_entry *pv, *npv = NULL; 1918 u_int entries = 0; 1919 u_int writable = 0; 1920 u_int cacheable_entries = 0; 1921 u_int kern_cacheable = 0; 1922 u_int other_writable = 0; 1923 1924 /* 1925 * Count mappings and writable mappings in this pmap. 1926 * Include kernel mappings as part of our own. 1927 * Keep a pointer to the first one. 1928 */ 1929 npv = NULL; 1930 KASSERT(pmap_page_locked_p(md)); 1931 SLIST_FOREACH(pv, &md->pvh_list, pv_link) { 1932 /* Count mappings in the same pmap */ 1933 if (pm == pv->pv_pmap || kpmap == pv->pv_pmap) { 1934 if (entries++ == 0) 1935 npv = pv; 1936 1937 /* Cacheable mappings */ 1938 if ((pv->pv_flags & PVF_NC) == 0) { 1939 cacheable_entries++; 1940 if (kpmap == pv->pv_pmap) 1941 kern_cacheable++; 1942 } 1943 1944 /* Writable mappings */ 1945 if (pv->pv_flags & PVF_WRITE) 1946 ++writable; 1947 } else 1948 if (pv->pv_flags & PVF_WRITE) 1949 other_writable = 1; 1950 } 1951 1952 /* 1953 * Enable or disable caching as necessary. 1954 * Note: the first entry might be part of the kernel pmap, 1955 * so we can't assume this is indicative of the state of the 1956 * other (maybe non-kpmap) entries. 1957 */ 1958 if ((entries > 1 && writable) || 1959 (entries > 0 && pm == kpmap && other_writable)) { 1960 if (cacheable_entries == 0) { 1961 return; 1962 } 1963 1964 for (pv = npv; pv; pv = SLIST_NEXT(pv, pv_link)) { 1965 if ((pm != pv->pv_pmap && kpmap != pv->pv_pmap) || 1966 (pv->pv_flags & PVF_NC)) 1967 continue; 1968 1969 pv->pv_flags |= PVF_NC; 1970 1971 struct l2_bucket * const l2b 1972 = pmap_get_l2_bucket(pv->pv_pmap, pv->pv_va); 1973 KASSERTMSG(l2b != NULL, "%#lx", va); 1974 pt_entry_t * const ptep 1975 = &l2b->l2b_kva[l2pte_index(pv->pv_va)]; 1976 const pt_entry_t opte = *ptep; 1977 pt_entry_t npte = opte & ~L2_S_CACHE_MASK; 1978 1979 if ((va != pv->pv_va || pm != pv->pv_pmap) 1980 && l2pte_valid_p(npte)) { 1981 #ifdef PMAP_CACHE_VIVT 1982 pmap_cache_wbinv_page(pv->pv_pmap, pv->pv_va, 1983 true, pv->pv_flags); 1984 #endif 1985 pmap_tlb_flush_SE(pv->pv_pmap, pv->pv_va, 1986 pv->pv_flags); 1987 } 1988 1989 l2pte_set(ptep, npte, opte); 1990 PTE_SYNC_CURRENT(pv->pv_pmap, ptep); 1991 } 1992 cpu_cpwait(); 1993 } else 1994 if (entries > cacheable_entries) { 1995 /* 1996 * Turn cacheing back on for some pages. If it is a kernel 1997 * page, only do so if there are no other writable pages. 1998 */ 1999 for (pv = npv; pv; pv = SLIST_NEXT(pv, pv_link)) { 2000 if (!(pv->pv_flags & PVF_NC) || (pm != pv->pv_pmap && 2001 (kpmap != pv->pv_pmap || other_writable))) 2002 continue; 2003 2004 pv->pv_flags &= ~PVF_NC; 2005 2006 struct l2_bucket * const l2b 2007 = pmap_get_l2_bucket(pv->pv_pmap, pv->pv_va); 2008 KASSERTMSG(l2b != NULL, "%#lx", va); 2009 pt_entry_t * const ptep 2010 = &l2b->l2b_kva[l2pte_index(pv->pv_va)]; 2011 const pt_entry_t opte = *ptep; 2012 pt_entry_t npte = (opte & ~L2_S_CACHE_MASK) 2013 | pte_l2_s_cache_mode; 2014 2015 if (l2pte_valid_p(opte)) { 2016 pmap_tlb_flush_SE(pv->pv_pmap, pv->pv_va, 2017 pv->pv_flags); 2018 } 2019 2020 l2pte_set(ptep, npte, opte); 2021 PTE_SYNC_CURRENT(pv->pv_pmap, ptep); 2022 } 2023 } 2024 } 2025 #endif 2026 2027 #ifdef PMAP_CACHE_VIPT 2028 static void 2029 pmap_vac_me_harder(struct vm_page_md *md, paddr_t pa, pmap_t pm, vaddr_t va) 2030 { 2031 #ifndef ARM_MMU_EXTENDED 2032 struct pv_entry *pv; 2033 vaddr_t tst_mask; 2034 bool bad_alias; 2035 const u_int 2036 rw_mappings = md->urw_mappings + md->krw_mappings, 2037 ro_mappings = md->uro_mappings + md->kro_mappings; 2038 2039 /* do we need to do anything? */ 2040 if (arm_cache_prefer_mask == 0) 2041 return; 2042 2043 NPDEBUG(PDB_VAC, printf("pmap_vac_me_harder: md=%p, pmap=%p va=%08lx\n", 2044 md, pm, va)); 2045 2046 KASSERT(!va || pm); 2047 KASSERT((md->pvh_attrs & PVF_DMOD) == 0 || (md->pvh_attrs & (PVF_DIRTY|PVF_NC))); 2048 2049 /* Already a conflict? */ 2050 if (__predict_false(md->pvh_attrs & PVF_NC)) { 2051 /* just an add, things are already non-cached */ 2052 KASSERT(!(md->pvh_attrs & PVF_DIRTY)); 2053 KASSERT(!(md->pvh_attrs & PVF_MULTCLR)); 2054 bad_alias = false; 2055 if (va) { 2056 PMAPCOUNT(vac_color_none); 2057 bad_alias = true; 2058 KASSERT((rw_mappings == 0) == !(md->pvh_attrs & PVF_WRITE)); 2059 goto fixup; 2060 } 2061 pv = SLIST_FIRST(&md->pvh_list); 2062 /* the list can't be empty because it would be cachable */ 2063 if (md->pvh_attrs & PVF_KMPAGE) { 2064 tst_mask = md->pvh_attrs; 2065 } else { 2066 KASSERT(pv); 2067 tst_mask = pv->pv_va; 2068 pv = SLIST_NEXT(pv, pv_link); 2069 } 2070 /* 2071 * Only check for a bad alias if we have writable mappings. 2072 */ 2073 tst_mask &= arm_cache_prefer_mask; 2074 if (rw_mappings > 0) { 2075 for (; pv && !bad_alias; pv = SLIST_NEXT(pv, pv_link)) { 2076 /* if there's a bad alias, stop checking. */ 2077 if (tst_mask != (pv->pv_va & arm_cache_prefer_mask)) 2078 bad_alias = true; 2079 } 2080 md->pvh_attrs |= PVF_WRITE; 2081 if (!bad_alias) 2082 md->pvh_attrs |= PVF_DIRTY; 2083 } else { 2084 /* 2085 * We have only read-only mappings. Let's see if there 2086 * are multiple colors in use or if we mapped a KMPAGE. 2087 * If the latter, we have a bad alias. If the former, 2088 * we need to remember that. 2089 */ 2090 for (; pv; pv = SLIST_NEXT(pv, pv_link)) { 2091 if (tst_mask != (pv->pv_va & arm_cache_prefer_mask)) { 2092 if (md->pvh_attrs & PVF_KMPAGE) 2093 bad_alias = true; 2094 break; 2095 } 2096 } 2097 md->pvh_attrs &= ~PVF_WRITE; 2098 /* 2099 * No KMPAGE and we exited early, so we must have 2100 * multiple color mappings. 2101 */ 2102 if (!bad_alias && pv != NULL) 2103 md->pvh_attrs |= PVF_MULTCLR; 2104 } 2105 2106 /* If no conflicting colors, set everything back to cached */ 2107 if (!bad_alias) { 2108 #ifdef DEBUG 2109 if ((md->pvh_attrs & PVF_WRITE) 2110 || ro_mappings < 2) { 2111 SLIST_FOREACH(pv, &md->pvh_list, pv_link) 2112 KDASSERT(((tst_mask ^ pv->pv_va) & arm_cache_prefer_mask) == 0); 2113 } 2114 #endif 2115 md->pvh_attrs &= (PAGE_SIZE - 1) & ~PVF_NC; 2116 md->pvh_attrs |= tst_mask | PVF_COLORED; 2117 /* 2118 * Restore DIRTY bit if page is modified 2119 */ 2120 if (md->pvh_attrs & PVF_DMOD) 2121 md->pvh_attrs |= PVF_DIRTY; 2122 PMAPCOUNT(vac_color_restore); 2123 } else { 2124 KASSERT(SLIST_FIRST(&md->pvh_list) != NULL); 2125 KASSERT(SLIST_NEXT(SLIST_FIRST(&md->pvh_list), pv_link) != NULL); 2126 } 2127 KASSERT((md->pvh_attrs & PVF_DMOD) == 0 || (md->pvh_attrs & (PVF_DIRTY|PVF_NC))); 2128 KASSERT((rw_mappings == 0) == !(md->pvh_attrs & PVF_WRITE)); 2129 } else if (!va) { 2130 KASSERT(pmap_is_page_colored_p(md)); 2131 KASSERT(!(md->pvh_attrs & PVF_WRITE) 2132 || (md->pvh_attrs & PVF_DIRTY)); 2133 if (rw_mappings == 0) { 2134 md->pvh_attrs &= ~PVF_WRITE; 2135 if (ro_mappings == 1 2136 && (md->pvh_attrs & PVF_MULTCLR)) { 2137 /* 2138 * If this is the last readonly mapping 2139 * but it doesn't match the current color 2140 * for the page, change the current color 2141 * to match this last readonly mapping. 2142 */ 2143 pv = SLIST_FIRST(&md->pvh_list); 2144 tst_mask = (md->pvh_attrs ^ pv->pv_va) 2145 & arm_cache_prefer_mask; 2146 if (tst_mask) { 2147 md->pvh_attrs ^= tst_mask; 2148 PMAPCOUNT(vac_color_change); 2149 } 2150 } 2151 } 2152 KASSERT((md->pvh_attrs & PVF_DMOD) == 0 || (md->pvh_attrs & (PVF_DIRTY|PVF_NC))); 2153 KASSERT((rw_mappings == 0) == !(md->pvh_attrs & PVF_WRITE)); 2154 return; 2155 } else if (!pmap_is_page_colored_p(md)) { 2156 /* not colored so we just use its color */ 2157 KASSERT(md->pvh_attrs & (PVF_WRITE|PVF_DIRTY)); 2158 KASSERT(!(md->pvh_attrs & PVF_MULTCLR)); 2159 PMAPCOUNT(vac_color_new); 2160 md->pvh_attrs &= PAGE_SIZE - 1; 2161 md->pvh_attrs |= PVF_COLORED 2162 | (va & arm_cache_prefer_mask) 2163 | (rw_mappings > 0 ? PVF_WRITE : 0); 2164 KASSERT((md->pvh_attrs & PVF_DMOD) == 0 || (md->pvh_attrs & (PVF_DIRTY|PVF_NC))); 2165 KASSERT((rw_mappings == 0) == !(md->pvh_attrs & PVF_WRITE)); 2166 return; 2167 } else if (((md->pvh_attrs ^ va) & arm_cache_prefer_mask) == 0) { 2168 bad_alias = false; 2169 if (rw_mappings > 0) { 2170 /* 2171 * We now have writeable mappings and if we have 2172 * readonly mappings in more than once color, we have 2173 * an aliasing problem. Regardless mark the page as 2174 * writeable. 2175 */ 2176 if (md->pvh_attrs & PVF_MULTCLR) { 2177 if (ro_mappings < 2) { 2178 /* 2179 * If we only have less than two 2180 * read-only mappings, just flush the 2181 * non-primary colors from the cache. 2182 */ 2183 pmap_flush_page(md, pa, 2184 PMAP_FLUSH_SECONDARY); 2185 } else { 2186 bad_alias = true; 2187 } 2188 } 2189 md->pvh_attrs |= PVF_WRITE; 2190 } 2191 /* If no conflicting colors, set everything back to cached */ 2192 if (!bad_alias) { 2193 #ifdef DEBUG 2194 if (rw_mappings > 0 2195 || (md->pvh_attrs & PMAP_KMPAGE)) { 2196 tst_mask = md->pvh_attrs & arm_cache_prefer_mask; 2197 SLIST_FOREACH(pv, &md->pvh_list, pv_link) 2198 KDASSERT(((tst_mask ^ pv->pv_va) & arm_cache_prefer_mask) == 0); 2199 } 2200 #endif 2201 if (SLIST_EMPTY(&md->pvh_list)) 2202 PMAPCOUNT(vac_color_reuse); 2203 else 2204 PMAPCOUNT(vac_color_ok); 2205 2206 /* matching color, just return */ 2207 KASSERT((md->pvh_attrs & PVF_DMOD) == 0 || (md->pvh_attrs & (PVF_DIRTY|PVF_NC))); 2208 KASSERT((rw_mappings == 0) == !(md->pvh_attrs & PVF_WRITE)); 2209 return; 2210 } 2211 KASSERT(SLIST_FIRST(&md->pvh_list) != NULL); 2212 KASSERT(SLIST_NEXT(SLIST_FIRST(&md->pvh_list), pv_link) != NULL); 2213 2214 /* color conflict. evict from cache. */ 2215 2216 pmap_flush_page(md, pa, PMAP_FLUSH_PRIMARY); 2217 md->pvh_attrs &= ~PVF_COLORED; 2218 md->pvh_attrs |= PVF_NC; 2219 KASSERT((md->pvh_attrs & PVF_DMOD) == 0 || (md->pvh_attrs & (PVF_DIRTY|PVF_NC))); 2220 KASSERT(!(md->pvh_attrs & PVF_MULTCLR)); 2221 PMAPCOUNT(vac_color_erase); 2222 } else if (rw_mappings == 0 2223 && (md->pvh_attrs & PVF_KMPAGE) == 0) { 2224 KASSERT((md->pvh_attrs & PVF_WRITE) == 0); 2225 2226 /* 2227 * If the page has dirty cache lines, clean it. 2228 */ 2229 if (md->pvh_attrs & PVF_DIRTY) 2230 pmap_flush_page(md, pa, PMAP_CLEAN_PRIMARY); 2231 2232 /* 2233 * If this is the first remapping (we know that there are no 2234 * writeable mappings), then this is a simple color change. 2235 * Otherwise this is a seconary r/o mapping, which means 2236 * we don't have to do anything. 2237 */ 2238 if (ro_mappings == 1) { 2239 KASSERT(((md->pvh_attrs ^ va) & arm_cache_prefer_mask) != 0); 2240 md->pvh_attrs &= PAGE_SIZE - 1; 2241 md->pvh_attrs |= (va & arm_cache_prefer_mask); 2242 PMAPCOUNT(vac_color_change); 2243 } else { 2244 PMAPCOUNT(vac_color_blind); 2245 } 2246 md->pvh_attrs |= PVF_MULTCLR; 2247 KASSERT((md->pvh_attrs & PVF_DMOD) == 0 || (md->pvh_attrs & (PVF_DIRTY|PVF_NC))); 2248 KASSERT((rw_mappings == 0) == !(md->pvh_attrs & PVF_WRITE)); 2249 return; 2250 } else { 2251 if (rw_mappings > 0) 2252 md->pvh_attrs |= PVF_WRITE; 2253 2254 /* color conflict. evict from cache. */ 2255 pmap_flush_page(md, pa, PMAP_FLUSH_PRIMARY); 2256 2257 /* the list can't be empty because this was a enter/modify */ 2258 pv = SLIST_FIRST(&md->pvh_list); 2259 if ((md->pvh_attrs & PVF_KMPAGE) == 0) { 2260 KASSERT(pv); 2261 /* 2262 * If there's only one mapped page, change color to the 2263 * page's new color and return. Restore the DIRTY bit 2264 * that was erased by pmap_flush_page. 2265 */ 2266 if (SLIST_NEXT(pv, pv_link) == NULL) { 2267 md->pvh_attrs &= PAGE_SIZE - 1; 2268 md->pvh_attrs |= (va & arm_cache_prefer_mask); 2269 if (md->pvh_attrs & PVF_DMOD) 2270 md->pvh_attrs |= PVF_DIRTY; 2271 PMAPCOUNT(vac_color_change); 2272 KASSERT((md->pvh_attrs & PVF_DMOD) == 0 || (md->pvh_attrs & (PVF_DIRTY|PVF_NC))); 2273 KASSERT((rw_mappings == 0) == !(md->pvh_attrs & PVF_WRITE)); 2274 KASSERT(!(md->pvh_attrs & PVF_MULTCLR)); 2275 return; 2276 } 2277 } 2278 bad_alias = true; 2279 md->pvh_attrs &= ~PVF_COLORED; 2280 md->pvh_attrs |= PVF_NC; 2281 PMAPCOUNT(vac_color_erase); 2282 KASSERT((md->pvh_attrs & PVF_DMOD) == 0 || (md->pvh_attrs & (PVF_DIRTY|PVF_NC))); 2283 } 2284 2285 fixup: 2286 KASSERT((rw_mappings == 0) == !(md->pvh_attrs & PVF_WRITE)); 2287 2288 /* 2289 * Turn cacheing on/off for all pages. 2290 */ 2291 SLIST_FOREACH(pv, &md->pvh_list, pv_link) { 2292 struct l2_bucket * const l2b = pmap_get_l2_bucket(pv->pv_pmap, 2293 pv->pv_va); 2294 KASSERTMSG(l2b != NULL, "%#lx", va); 2295 pt_entry_t * const ptep = &l2b->l2b_kva[l2pte_index(pv->pv_va)]; 2296 const pt_entry_t opte = *ptep; 2297 pt_entry_t npte = opte & ~L2_S_CACHE_MASK; 2298 if (bad_alias) { 2299 pv->pv_flags |= PVF_NC; 2300 } else { 2301 pv->pv_flags &= ~PVF_NC; 2302 npte |= pte_l2_s_cache_mode; 2303 } 2304 2305 if (opte == npte) /* only update is there's a change */ 2306 continue; 2307 2308 if (l2pte_valid_p(npte)) { 2309 pmap_tlb_flush_SE(pv->pv_pmap, pv->pv_va, pv->pv_flags); 2310 } 2311 2312 l2pte_set(ptep, npte, opte); 2313 PTE_SYNC_CURRENT(pv->pv_pmap, ptep); 2314 } 2315 #endif /* !ARM_MMU_EXTENDED */ 2316 } 2317 #endif /* PMAP_CACHE_VIPT */ 2318 2319 2320 /* 2321 * Modify pte bits for all ptes corresponding to the given physical address. 2322 * We use `maskbits' rather than `clearbits' because we're always passing 2323 * constants and the latter would require an extra inversion at run-time. 2324 */ 2325 static void 2326 pmap_clearbit(struct vm_page_md *md, paddr_t pa, u_int maskbits) 2327 { 2328 struct pv_entry *pv; 2329 #ifdef PMAP_CACHE_VIPT 2330 const bool want_syncicache = PV_IS_EXEC_P(md->pvh_attrs); 2331 #ifdef ARM_MMU_EXTENDED 2332 const u_int execbits = (maskbits & PVF_EXEC) ? L2_XS_XN : 0; 2333 #else 2334 const u_int execbits = 0; 2335 bool need_vac_me_harder = false; 2336 bool need_syncicache = false; 2337 #endif 2338 #else 2339 const u_int execbits = 0; 2340 #endif 2341 2342 NPDEBUG(PDB_BITS, 2343 printf("pmap_clearbit: md %p mask 0x%x\n", 2344 md, maskbits)); 2345 2346 #ifdef PMAP_CACHE_VIPT 2347 /* 2348 * If we might want to sync the I-cache and we've modified it, 2349 * then we know we definitely need to sync or discard it. 2350 */ 2351 if (want_syncicache) { 2352 #ifdef ARM_MMU_EXTENDED 2353 if (md->pvh_attrs & PVF_MOD) 2354 md->pvh_attrs &= ~PVF_EXEC; 2355 #else 2356 need_syncicache = md->pvh_attrs & PVF_MOD; 2357 #endif 2358 } 2359 #endif 2360 KASSERT(pmap_page_locked_p(md)); 2361 2362 /* 2363 * Clear saved attributes (modify, reference) 2364 */ 2365 md->pvh_attrs &= ~(maskbits & (PVF_MOD | PVF_REF)); 2366 2367 if (SLIST_EMPTY(&md->pvh_list)) { 2368 #if defined(PMAP_CACHE_VIPT) && !defined(ARM_MMU_EXTENDED) 2369 if (need_syncicache) { 2370 /* 2371 * No one has it mapped, so just discard it. The next 2372 * exec remapping will cause it to be synced. 2373 */ 2374 md->pvh_attrs &= ~PVF_EXEC; 2375 PMAPCOUNT(exec_discarded_clearbit); 2376 } 2377 #endif 2378 return; 2379 } 2380 2381 /* 2382 * Loop over all current mappings setting/clearing as appropos 2383 */ 2384 SLIST_FOREACH(pv, &md->pvh_list, pv_link) { 2385 pmap_t pm = pv->pv_pmap; 2386 const vaddr_t va = pv->pv_va; 2387 const u_int oflags = pv->pv_flags; 2388 #ifndef ARM_MMU_EXTENDED 2389 /* 2390 * Kernel entries are unmanaged and as such not to be changed. 2391 */ 2392 if (PV_IS_KENTRY_P(oflags)) 2393 continue; 2394 #endif 2395 pv->pv_flags &= ~maskbits; 2396 2397 pmap_release_page_lock(md); 2398 pmap_acquire_pmap_lock(pm); 2399 2400 struct l2_bucket * const l2b = pmap_get_l2_bucket(pm, va); 2401 if (l2b == NULL) { 2402 pmap_release_pmap_lock(pm); 2403 pmap_acquire_page_lock(md); 2404 continue; 2405 } 2406 KASSERTMSG(l2b != NULL, "%#lx", va); 2407 2408 pt_entry_t * const ptep = &l2b->l2b_kva[l2pte_index(va)]; 2409 const pt_entry_t opte = *ptep; 2410 pt_entry_t npte = opte | execbits; 2411 2412 #ifdef ARM_MMU_EXTENDED 2413 KASSERT((opte & L2_XS_nG) == (pm == pmap_kernel() ? 0 : L2_XS_nG)); 2414 #endif 2415 2416 NPDEBUG(PDB_BITS, 2417 printf( "%s: pv %p, pm %p, va 0x%08lx, flag 0x%x\n", 2418 __func__, pv, pm, va, oflags)); 2419 2420 if (maskbits & (PVF_WRITE|PVF_MOD)) { 2421 #ifdef PMAP_CACHE_VIVT 2422 if ((oflags & PVF_NC)) { 2423 /* 2424 * Entry is not cacheable: 2425 * 2426 * Don't turn caching on again if this is a 2427 * modified emulation. This would be 2428 * inconsitent with the settings created by 2429 * pmap_vac_me_harder(). Otherwise, it's safe 2430 * to re-enable cacheing. 2431 * 2432 * There's no need to call pmap_vac_me_harder() 2433 * here: all pages are losing their write 2434 * permission. 2435 */ 2436 if (maskbits & PVF_WRITE) { 2437 npte |= pte_l2_s_cache_mode; 2438 pv->pv_flags &= ~PVF_NC; 2439 } 2440 } else 2441 if (l2pte_writable_p(opte)) { 2442 /* 2443 * Entry is writable/cacheable: check if pmap 2444 * is current if it is flush it, otherwise it 2445 * won't be in the cache 2446 */ 2447 pmap_cache_wbinv_page(pm, va, 2448 (maskbits & PVF_REF) != 0, 2449 oflags|PVF_WRITE); 2450 } 2451 #endif 2452 2453 /* make the pte read only */ 2454 npte = l2pte_set_readonly(npte); 2455 2456 pmap_acquire_page_lock(md); 2457 #ifdef MULTIPROCESSOR 2458 pv = pmap_find_pv(md, pm, va); 2459 #endif 2460 if (pv != NULL && (maskbits & oflags & PVF_WRITE)) { 2461 /* 2462 * Keep alias accounting up to date 2463 */ 2464 if (pm == pmap_kernel()) { 2465 md->krw_mappings--; 2466 md->kro_mappings++; 2467 } else { 2468 md->urw_mappings--; 2469 md->uro_mappings++; 2470 } 2471 #ifdef PMAP_CACHE_VIPT 2472 if (arm_cache_prefer_mask != 0) { 2473 if (md->urw_mappings + md->krw_mappings == 0) { 2474 md->pvh_attrs &= ~PVF_WRITE; 2475 } else { 2476 PMAP_VALIDATE_MD_PAGE(md); 2477 } 2478 } 2479 #ifndef ARM_MMU_EXTENDED 2480 if (want_syncicache) 2481 need_syncicache = true; 2482 need_vac_me_harder = true; 2483 #endif 2484 #endif /* PMAP_CACHE_VIPT */ 2485 } 2486 pmap_release_page_lock(md); 2487 } 2488 2489 if (maskbits & PVF_REF) { 2490 if (true 2491 #ifndef ARM_MMU_EXTENDED 2492 && (oflags & PVF_NC) == 0 2493 #endif 2494 && (maskbits & (PVF_WRITE|PVF_MOD)) == 0 2495 && l2pte_valid_p(npte)) { 2496 #ifdef PMAP_CACHE_VIVT 2497 /* 2498 * Check npte here; we may have already 2499 * done the wbinv above, and the validity 2500 * of the PTE is the same for opte and 2501 * npte. 2502 */ 2503 pmap_cache_wbinv_page(pm, va, true, oflags); 2504 #endif 2505 } 2506 2507 /* 2508 * Make the PTE invalid so that we will take a 2509 * page fault the next time the mapping is 2510 * referenced. 2511 */ 2512 npte &= ~L2_TYPE_MASK; 2513 npte |= L2_TYPE_INV; 2514 } 2515 2516 if (npte != opte) { 2517 l2pte_reset(ptep); 2518 PTE_SYNC(ptep); 2519 2520 /* Flush the TLB entry if a current pmap. */ 2521 pmap_tlb_flush_SE(pm, va, oflags); 2522 2523 l2pte_set(ptep, npte, 0); 2524 PTE_SYNC(ptep); 2525 } 2526 2527 pmap_release_pmap_lock(pm); 2528 pmap_acquire_page_lock(md); 2529 2530 NPDEBUG(PDB_BITS, 2531 printf("pmap_clearbit: pm %p va 0x%lx opte 0x%08x npte 0x%08x\n", 2532 pm, va, opte, npte)); 2533 } 2534 2535 #if defined(PMAP_CACHE_VIPT) && !defined(ARM_MMU_EXTENDED) 2536 /* 2537 * If we need to sync the I-cache and we haven't done it yet, do it. 2538 */ 2539 if (need_syncicache) { 2540 pmap_release_page_lock(md); 2541 pmap_syncicache_page(md, pa); 2542 pmap_acquire_page_lock(md); 2543 PMAPCOUNT(exec_synced_clearbit); 2544 } 2545 2546 /* 2547 * If we are changing this to read-only, we need to call vac_me_harder 2548 * so we can change all the read-only pages to cacheable. We pretend 2549 * this as a page deletion. 2550 */ 2551 if (need_vac_me_harder) { 2552 if (md->pvh_attrs & PVF_NC) 2553 pmap_vac_me_harder(md, pa, NULL, 0); 2554 } 2555 #endif /* PMAP_CACHE_VIPT && !ARM_MMU_EXTENDED */ 2556 } 2557 2558 /* 2559 * pmap_clean_page() 2560 * 2561 * This is a local function used to work out the best strategy to clean 2562 * a single page referenced by its entry in the PV table. It's used by 2563 * pmap_copy_page, pmap_zero_page and maybe some others later on. 2564 * 2565 * Its policy is effectively: 2566 * o If there are no mappings, we don't bother doing anything with the cache. 2567 * o If there is one mapping, we clean just that page. 2568 * o If there are multiple mappings, we clean the entire cache. 2569 * 2570 * So that some functions can be further optimised, it returns 0 if it didn't 2571 * clean the entire cache, or 1 if it did. 2572 * 2573 * XXX One bug in this routine is that if the pv_entry has a single page 2574 * mapped at 0x00000000 a whole cache clean will be performed rather than 2575 * just the 1 page. Since this should not occur in everyday use and if it does 2576 * it will just result in not the most efficient clean for the page. 2577 */ 2578 #ifdef PMAP_CACHE_VIVT 2579 static bool 2580 pmap_clean_page(struct vm_page_md *md, bool is_src) 2581 { 2582 struct pv_entry *pv; 2583 pmap_t pm_to_clean = NULL; 2584 bool cache_needs_cleaning = false; 2585 vaddr_t page_to_clean = 0; 2586 u_int flags = 0; 2587 2588 /* 2589 * Since we flush the cache each time we change to a different 2590 * user vmspace, we only need to flush the page if it is in the 2591 * current pmap. 2592 */ 2593 KASSERT(pmap_page_locked_p(md)); 2594 SLIST_FOREACH(pv, &md->pvh_list, pv_link) { 2595 if (pmap_is_current(pv->pv_pmap)) { 2596 flags |= pv->pv_flags; 2597 /* 2598 * The page is mapped non-cacheable in 2599 * this map. No need to flush the cache. 2600 */ 2601 if (pv->pv_flags & PVF_NC) { 2602 #ifdef DIAGNOSTIC 2603 KASSERT(!cache_needs_cleaning); 2604 #endif 2605 break; 2606 } else if (is_src && (pv->pv_flags & PVF_WRITE) == 0) 2607 continue; 2608 if (cache_needs_cleaning) { 2609 page_to_clean = 0; 2610 break; 2611 } else { 2612 page_to_clean = pv->pv_va; 2613 pm_to_clean = pv->pv_pmap; 2614 } 2615 cache_needs_cleaning = true; 2616 } 2617 } 2618 2619 if (page_to_clean) { 2620 pmap_cache_wbinv_page(pm_to_clean, page_to_clean, 2621 !is_src, flags | PVF_REF); 2622 } else if (cache_needs_cleaning) { 2623 pmap_t const pm = curproc->p_vmspace->vm_map.pmap; 2624 2625 pmap_cache_wbinv_all(pm, flags); 2626 return true; 2627 } 2628 return false; 2629 } 2630 #endif 2631 2632 #ifdef PMAP_CACHE_VIPT 2633 /* 2634 * Sync a page with the I-cache. Since this is a VIPT, we must pick the 2635 * right cache alias to make sure we flush the right stuff. 2636 */ 2637 void 2638 pmap_syncicache_page(struct vm_page_md *md, paddr_t pa) 2639 { 2640 pmap_t kpm = pmap_kernel(); 2641 const size_t way_size = arm_pcache.icache_type == CACHE_TYPE_PIPT 2642 ? PAGE_SIZE 2643 : arm_pcache.icache_way_size; 2644 2645 NPDEBUG(PDB_EXEC, printf("pmap_syncicache_page: md=%p (attrs=%#x)\n", 2646 md, md->pvh_attrs)); 2647 /* 2648 * No need to clean the page if it's non-cached. 2649 */ 2650 #ifndef ARM_MMU_EXTENDED 2651 if (md->pvh_attrs & PVF_NC) 2652 return; 2653 KASSERT(arm_cache_prefer_mask == 0 || md->pvh_attrs & PVF_COLORED); 2654 #endif 2655 2656 pt_entry_t * const ptep = cpu_cdst_pte(0); 2657 const vaddr_t dstp = cpu_cdstp(0); 2658 #ifdef __HAVE_MM_MD_DIRECT_MAPPED_PHYS 2659 if (way_size <= PAGE_SIZE) { 2660 bool ok = false; 2661 vaddr_t vdstp = pmap_direct_mapped_phys(pa, &ok, dstp); 2662 if (ok) { 2663 cpu_icache_sync_range(vdstp, way_size); 2664 return; 2665 } 2666 } 2667 #endif 2668 2669 /* 2670 * We don't worry about the color of the exec page, we map the 2671 * same page to pages in the way and then do the icache_sync on 2672 * the entire way making sure we are cleaned. 2673 */ 2674 const pt_entry_t npte = L2_S_PROTO | pa | pte_l2_s_cache_mode 2675 | L2_S_PROT(PTE_KERNEL, VM_PROT_READ|VM_PROT_WRITE); 2676 2677 for (size_t i = 0, j = 0; i < way_size; 2678 i += PAGE_SIZE, j += PAGE_SIZE / L2_S_SIZE) { 2679 l2pte_reset(ptep + j); 2680 PTE_SYNC(ptep + j); 2681 2682 pmap_tlb_flush_SE(kpm, dstp + i, PVF_REF | PVF_EXEC); 2683 /* 2684 * Set up a PTE with to flush these cache lines. 2685 */ 2686 l2pte_set(ptep + j, npte, 0); 2687 } 2688 PTE_SYNC_RANGE(ptep, way_size / L2_S_SIZE); 2689 2690 /* 2691 * Flush it. 2692 */ 2693 cpu_icache_sync_range(dstp, way_size); 2694 2695 for (size_t i = 0, j = 0; i < way_size; 2696 i += PAGE_SIZE, j += PAGE_SIZE / L2_S_SIZE) { 2697 /* 2698 * Unmap the page(s). 2699 */ 2700 l2pte_reset(ptep + j); 2701 pmap_tlb_flush_SE(kpm, dstp + i, PVF_REF | PVF_EXEC); 2702 } 2703 PTE_SYNC_RANGE(ptep, way_size / L2_S_SIZE); 2704 2705 md->pvh_attrs |= PVF_EXEC; 2706 PMAPCOUNT(exec_synced); 2707 } 2708 2709 #ifndef ARM_MMU_EXTENDED 2710 void 2711 pmap_flush_page(struct vm_page_md *md, paddr_t pa, enum pmap_flush_op flush) 2712 { 2713 vsize_t va_offset, end_va; 2714 bool wbinv_p; 2715 2716 if (arm_cache_prefer_mask == 0) 2717 return; 2718 2719 switch (flush) { 2720 case PMAP_FLUSH_PRIMARY: 2721 if (md->pvh_attrs & PVF_MULTCLR) { 2722 va_offset = 0; 2723 end_va = arm_cache_prefer_mask; 2724 md->pvh_attrs &= ~PVF_MULTCLR; 2725 PMAPCOUNT(vac_flush_lots); 2726 } else { 2727 va_offset = md->pvh_attrs & arm_cache_prefer_mask; 2728 end_va = va_offset; 2729 PMAPCOUNT(vac_flush_one); 2730 } 2731 /* 2732 * Mark that the page is no longer dirty. 2733 */ 2734 md->pvh_attrs &= ~PVF_DIRTY; 2735 wbinv_p = true; 2736 break; 2737 case PMAP_FLUSH_SECONDARY: 2738 va_offset = 0; 2739 end_va = arm_cache_prefer_mask; 2740 wbinv_p = true; 2741 md->pvh_attrs &= ~PVF_MULTCLR; 2742 PMAPCOUNT(vac_flush_lots); 2743 break; 2744 case PMAP_CLEAN_PRIMARY: 2745 va_offset = md->pvh_attrs & arm_cache_prefer_mask; 2746 end_va = va_offset; 2747 wbinv_p = false; 2748 /* 2749 * Mark that the page is no longer dirty. 2750 */ 2751 if ((md->pvh_attrs & PVF_DMOD) == 0) 2752 md->pvh_attrs &= ~PVF_DIRTY; 2753 PMAPCOUNT(vac_clean_one); 2754 break; 2755 default: 2756 return; 2757 } 2758 2759 KASSERT(!(md->pvh_attrs & PVF_NC)); 2760 2761 NPDEBUG(PDB_VAC, printf("pmap_flush_page: md=%p (attrs=%#x)\n", 2762 md, md->pvh_attrs)); 2763 2764 const size_t scache_line_size = arm_scache.dcache_line_size; 2765 2766 for (; va_offset <= end_va; va_offset += PAGE_SIZE) { 2767 pt_entry_t * const ptep = cpu_cdst_pte(va_offset); 2768 const vaddr_t dstp = cpu_cdstp(va_offset); 2769 const pt_entry_t opte = *ptep; 2770 2771 if (flush == PMAP_FLUSH_SECONDARY 2772 && va_offset == (md->pvh_attrs & arm_cache_prefer_mask)) 2773 continue; 2774 2775 pmap_tlb_flush_SE(pmap_kernel(), dstp, PVF_REF | PVF_EXEC); 2776 /* 2777 * Set up a PTE with the right coloring to flush 2778 * existing cache entries. 2779 */ 2780 const pt_entry_t npte = L2_S_PROTO 2781 | pa 2782 | L2_S_PROT(PTE_KERNEL, VM_PROT_READ|VM_PROT_WRITE) 2783 | pte_l2_s_cache_mode; 2784 l2pte_set(ptep, npte, opte); 2785 PTE_SYNC(ptep); 2786 2787 /* 2788 * Flush it. Make sure to flush secondary cache too since 2789 * bus_dma will ignore uncached pages. 2790 */ 2791 if (scache_line_size != 0) { 2792 cpu_dcache_wb_range(dstp, PAGE_SIZE); 2793 if (wbinv_p) { 2794 cpu_sdcache_wbinv_range(dstp, pa, PAGE_SIZE); 2795 cpu_dcache_inv_range(dstp, PAGE_SIZE); 2796 } else { 2797 cpu_sdcache_wb_range(dstp, pa, PAGE_SIZE); 2798 } 2799 } else { 2800 if (wbinv_p) { 2801 cpu_dcache_wbinv_range(dstp, PAGE_SIZE); 2802 } else { 2803 cpu_dcache_wb_range(dstp, PAGE_SIZE); 2804 } 2805 } 2806 2807 /* 2808 * Restore the page table entry since we might have interrupted 2809 * pmap_zero_page or pmap_copy_page which was already using 2810 * this pte. 2811 */ 2812 if (opte) { 2813 l2pte_set(ptep, opte, npte); 2814 } else { 2815 l2pte_reset(ptep); 2816 } 2817 PTE_SYNC(ptep); 2818 pmap_tlb_flush_SE(pmap_kernel(), dstp, PVF_REF | PVF_EXEC); 2819 } 2820 } 2821 #endif /* ARM_MMU_EXTENDED */ 2822 #endif /* PMAP_CACHE_VIPT */ 2823 2824 /* 2825 * Routine: pmap_page_remove 2826 * Function: 2827 * Removes this physical page from 2828 * all physical maps in which it resides. 2829 * Reflects back modify bits to the pager. 2830 */ 2831 static void 2832 pmap_page_remove(struct vm_page_md *md, paddr_t pa) 2833 { 2834 struct l2_bucket *l2b; 2835 struct pv_entry *pv; 2836 pt_entry_t *ptep; 2837 #ifndef ARM_MMU_EXTENDED 2838 bool flush = false; 2839 #endif 2840 u_int flags = 0; 2841 2842 NPDEBUG(PDB_FOLLOW, 2843 printf("pmap_page_remove: md %p (0x%08lx)\n", md, 2844 pa)); 2845 2846 struct pv_entry **pvp = &SLIST_FIRST(&md->pvh_list); 2847 pmap_acquire_page_lock(md); 2848 if (*pvp == NULL) { 2849 #ifdef PMAP_CACHE_VIPT 2850 /* 2851 * We *know* the page contents are about to be replaced. 2852 * Discard the exec contents 2853 */ 2854 if (PV_IS_EXEC_P(md->pvh_attrs)) 2855 PMAPCOUNT(exec_discarded_page_protect); 2856 md->pvh_attrs &= ~PVF_EXEC; 2857 PMAP_VALIDATE_MD_PAGE(md); 2858 #endif 2859 pmap_release_page_lock(md); 2860 return; 2861 } 2862 #if defined(PMAP_CACHE_VIPT) && !defined(ARM_MMU_EXTENDED) 2863 KASSERT(arm_cache_prefer_mask == 0 || pmap_is_page_colored_p(md)); 2864 #endif 2865 2866 /* 2867 * Clear alias counts 2868 */ 2869 #ifdef PMAP_CACHE_VIVT 2870 md->k_mappings = 0; 2871 #endif 2872 md->urw_mappings = md->uro_mappings = 0; 2873 2874 #ifdef PMAP_CACHE_VIVT 2875 pmap_clean_page(md, false); 2876 #endif 2877 2878 while ((pv = *pvp) != NULL) { 2879 pmap_t pm = pv->pv_pmap; 2880 #ifndef ARM_MMU_EXTENDED 2881 if (flush == false && pmap_is_current(pm)) 2882 flush = true; 2883 #endif 2884 2885 if (pm == pmap_kernel()) { 2886 #ifdef PMAP_CACHE_VIPT 2887 /* 2888 * If this was unmanaged mapping, it must be preserved. 2889 * Move it back on the list and advance the end-of-list 2890 * pointer. 2891 */ 2892 if (PV_IS_KENTRY_P(pv->pv_flags)) { 2893 *pvp = pv; 2894 pvp = &SLIST_NEXT(pv, pv_link); 2895 continue; 2896 } 2897 if (pv->pv_flags & PVF_WRITE) 2898 md->krw_mappings--; 2899 else 2900 md->kro_mappings--; 2901 #endif 2902 PMAPCOUNT(kernel_unmappings); 2903 } 2904 *pvp = SLIST_NEXT(pv, pv_link); /* remove from list */ 2905 PMAPCOUNT(unmappings); 2906 2907 pmap_release_page_lock(md); 2908 pmap_acquire_pmap_lock(pm); 2909 2910 l2b = pmap_get_l2_bucket(pm, pv->pv_va); 2911 KASSERTMSG(l2b != NULL, "%#lx", pv->pv_va); 2912 2913 ptep = &l2b->l2b_kva[l2pte_index(pv->pv_va)]; 2914 2915 /* 2916 * Update statistics 2917 */ 2918 --pm->pm_stats.resident_count; 2919 2920 /* Wired bit */ 2921 if (pv->pv_flags & PVF_WIRED) 2922 --pm->pm_stats.wired_count; 2923 2924 flags |= pv->pv_flags; 2925 2926 /* 2927 * Invalidate the PTEs. 2928 */ 2929 l2pte_reset(ptep); 2930 PTE_SYNC_CURRENT(pm, ptep); 2931 2932 #ifdef ARM_MMU_EXTENDED 2933 pmap_tlb_invalidate_addr(pm, pv->pv_va); 2934 #endif 2935 2936 pmap_free_l2_bucket(pm, l2b, PAGE_SIZE / L2_S_SIZE); 2937 2938 pmap_release_pmap_lock(pm); 2939 2940 pool_put(&pmap_pv_pool, pv); 2941 pmap_acquire_page_lock(md); 2942 #ifdef MULTIPROCESSOR 2943 /* 2944 * Restart of the beginning of the list. 2945 */ 2946 pvp = &SLIST_FIRST(&md->pvh_list); 2947 #endif 2948 } 2949 /* 2950 * if we reach the end of the list and there are still mappings, they 2951 * might be able to be cached now. And they must be kernel mappings. 2952 */ 2953 if (!SLIST_EMPTY(&md->pvh_list)) { 2954 pmap_vac_me_harder(md, pa, pmap_kernel(), 0); 2955 } 2956 2957 #ifdef PMAP_CACHE_VIPT 2958 /* 2959 * Its EXEC cache is now gone. 2960 */ 2961 if (PV_IS_EXEC_P(md->pvh_attrs)) 2962 PMAPCOUNT(exec_discarded_page_protect); 2963 md->pvh_attrs &= ~PVF_EXEC; 2964 KASSERT(md->urw_mappings == 0); 2965 KASSERT(md->uro_mappings == 0); 2966 #ifndef ARM_MMU_EXTENDED 2967 if (arm_cache_prefer_mask != 0) { 2968 if (md->krw_mappings == 0) 2969 md->pvh_attrs &= ~PVF_WRITE; 2970 PMAP_VALIDATE_MD_PAGE(md); 2971 } 2972 #endif /* ARM_MMU_EXTENDED */ 2973 #endif /* PMAP_CACHE_VIPT */ 2974 pmap_release_page_lock(md); 2975 2976 #ifndef ARM_MMU_EXTENDED 2977 if (flush) { 2978 /* 2979 * Note: We can't use pmap_tlb_flush{I,D}() here since that 2980 * would need a subsequent call to pmap_update() to ensure 2981 * curpm->pm_cstate.cs_all is reset. Our callers are not 2982 * required to do that (see pmap(9)), so we can't modify 2983 * the current pmap's state. 2984 */ 2985 if (PV_BEEN_EXECD(flags)) 2986 cpu_tlb_flushID(); 2987 else 2988 cpu_tlb_flushD(); 2989 } 2990 cpu_cpwait(); 2991 #endif /* ARM_MMU_EXTENDED */ 2992 } 2993 2994 /* 2995 * pmap_t pmap_create(void) 2996 * 2997 * Create a new pmap structure from scratch. 2998 */ 2999 pmap_t 3000 pmap_create(void) 3001 { 3002 pmap_t pm; 3003 3004 pm = pool_cache_get(&pmap_cache, PR_WAITOK); 3005 3006 mutex_init(&pm->pm_obj_lock, MUTEX_DEFAULT, IPL_NONE); 3007 uvm_obj_init(&pm->pm_obj, NULL, false, 1); 3008 uvm_obj_setlock(&pm->pm_obj, &pm->pm_obj_lock); 3009 3010 pm->pm_stats.wired_count = 0; 3011 pm->pm_stats.resident_count = 1; 3012 #ifdef ARM_MMU_EXTENDED 3013 #ifdef MULTIPROCESSOR 3014 kcpuset_create(&pm->pm_active, true); 3015 kcpuset_create(&pm->pm_onproc, true); 3016 #endif 3017 #else 3018 pm->pm_cstate.cs_all = 0; 3019 #endif 3020 pmap_alloc_l1(pm); 3021 3022 /* 3023 * Note: The pool cache ensures that the pm_l2[] array is already 3024 * initialised to zero. 3025 */ 3026 3027 pmap_pinit(pm); 3028 3029 return (pm); 3030 } 3031 3032 u_int 3033 arm32_mmap_flags(paddr_t pa) 3034 { 3035 /* 3036 * the upper 8 bits in pmap_enter()'s flags are reserved for MD stuff 3037 * and we're using the upper bits in page numbers to pass flags around 3038 * so we might as well use the same bits 3039 */ 3040 return (u_int)pa & PMAP_MD_MASK; 3041 } 3042 /* 3043 * int pmap_enter(pmap_t pm, vaddr_t va, paddr_t pa, vm_prot_t prot, 3044 * u_int flags) 3045 * 3046 * Insert the given physical page (p) at 3047 * the specified virtual address (v) in the 3048 * target physical map with the protection requested. 3049 * 3050 * NB: This is the only routine which MAY NOT lazy-evaluate 3051 * or lose information. That is, this routine must actually 3052 * insert this page into the given map NOW. 3053 */ 3054 int 3055 pmap_enter(pmap_t pm, vaddr_t va, paddr_t pa, vm_prot_t prot, u_int flags) 3056 { 3057 struct l2_bucket *l2b; 3058 struct vm_page *pg, *opg; 3059 u_int nflags; 3060 u_int oflags; 3061 const bool kpm_p = (pm == pmap_kernel()); 3062 #ifdef ARM_HAS_VBAR 3063 const bool vector_page_p = false; 3064 #else 3065 const bool vector_page_p = (va == vector_page); 3066 #endif 3067 3068 UVMHIST_FUNC(__func__); UVMHIST_CALLED(maphist); 3069 3070 UVMHIST_LOG(maphist, " (pm %p va %#x pa %#x prot %#x", 3071 pm, va, pa, prot); 3072 UVMHIST_LOG(maphist, " flag %#x", flags, 0, 0, 0); 3073 3074 KDASSERT((flags & PMAP_WIRED) == 0 || (flags & VM_PROT_ALL) != 0); 3075 KDASSERT(((va | pa) & PGOFSET) == 0); 3076 3077 /* 3078 * Get a pointer to the page. Later on in this function, we 3079 * test for a managed page by checking pg != NULL. 3080 */ 3081 pg = pmap_initialized ? PHYS_TO_VM_PAGE(pa) : NULL; 3082 3083 nflags = 0; 3084 if (prot & VM_PROT_WRITE) 3085 nflags |= PVF_WRITE; 3086 if (prot & VM_PROT_EXECUTE) 3087 nflags |= PVF_EXEC; 3088 if (flags & PMAP_WIRED) 3089 nflags |= PVF_WIRED; 3090 3091 pmap_acquire_pmap_lock(pm); 3092 3093 /* 3094 * Fetch the L2 bucket which maps this page, allocating one if 3095 * necessary for user pmaps. 3096 */ 3097 if (kpm_p) { 3098 l2b = pmap_get_l2_bucket(pm, va); 3099 } else { 3100 l2b = pmap_alloc_l2_bucket(pm, va); 3101 } 3102 if (l2b == NULL) { 3103 if (flags & PMAP_CANFAIL) { 3104 pmap_release_pmap_lock(pm); 3105 return (ENOMEM); 3106 } 3107 panic("pmap_enter: failed to allocate L2 bucket"); 3108 } 3109 pt_entry_t *ptep = &l2b->l2b_kva[l2pte_index(va)]; 3110 const pt_entry_t opte = *ptep; 3111 pt_entry_t npte = pa; 3112 oflags = 0; 3113 3114 if (opte) { 3115 /* 3116 * There is already a mapping at this address. 3117 * If the physical address is different, lookup the 3118 * vm_page. 3119 */ 3120 if (l2pte_pa(opte) != pa) { 3121 KASSERT(!pmap_pv_tracked(pa)); 3122 opg = PHYS_TO_VM_PAGE(l2pte_pa(opte)); 3123 } else 3124 opg = pg; 3125 } else 3126 opg = NULL; 3127 3128 struct pmap_page *pp = pmap_pv_tracked(pa); 3129 3130 if (pg || pp) { 3131 KASSERT((pg != NULL) != (pp != NULL)); 3132 struct vm_page_md *md = (pg != NULL) ? VM_PAGE_TO_MD(pg) : 3133 PMAP_PAGE_TO_MD(pp); 3134 3135 /* 3136 * This is to be a managed mapping. 3137 */ 3138 pmap_acquire_page_lock(md); 3139 if ((flags & VM_PROT_ALL) || (md->pvh_attrs & PVF_REF)) { 3140 /* 3141 * - The access type indicates that we don't need 3142 * to do referenced emulation. 3143 * OR 3144 * - The physical page has already been referenced 3145 * so no need to re-do referenced emulation here. 3146 */ 3147 npte |= l2pte_set_readonly(L2_S_PROTO); 3148 3149 nflags |= PVF_REF; 3150 3151 if ((prot & VM_PROT_WRITE) != 0 && 3152 ((flags & VM_PROT_WRITE) != 0 || 3153 (md->pvh_attrs & PVF_MOD) != 0)) { 3154 /* 3155 * This is a writable mapping, and the 3156 * page's mod state indicates it has 3157 * already been modified. Make it 3158 * writable from the outset. 3159 */ 3160 npte = l2pte_set_writable(npte); 3161 nflags |= PVF_MOD; 3162 } 3163 3164 #ifdef ARM_MMU_EXTENDED 3165 /* 3166 * If the page has been cleaned, then the pvh_attrs 3167 * will have PVF_EXEC set, so mark it execute so we 3168 * don't get an access fault when trying to execute 3169 * from it. 3170 */ 3171 if (md->pvh_attrs & nflags & PVF_EXEC) { 3172 npte &= ~L2_XS_XN; 3173 } 3174 #endif 3175 } else { 3176 /* 3177 * Need to do page referenced emulation. 3178 */ 3179 npte |= L2_TYPE_INV; 3180 } 3181 3182 if (flags & ARM32_MMAP_WRITECOMBINE) { 3183 npte |= pte_l2_s_wc_mode; 3184 } else 3185 npte |= pte_l2_s_cache_mode; 3186 3187 if (pg != NULL && pg == opg) { 3188 /* 3189 * We're changing the attrs of an existing mapping. 3190 */ 3191 oflags = pmap_modify_pv(md, pa, pm, va, 3192 PVF_WRITE | PVF_EXEC | PVF_WIRED | 3193 PVF_MOD | PVF_REF, nflags); 3194 3195 #ifdef PMAP_CACHE_VIVT 3196 /* 3197 * We may need to flush the cache if we're 3198 * doing rw-ro... 3199 */ 3200 if (pm->pm_cstate.cs_cache_d && 3201 (oflags & PVF_NC) == 0 && 3202 l2pte_writable_p(opte) && 3203 (prot & VM_PROT_WRITE) == 0) 3204 cpu_dcache_wb_range(va, PAGE_SIZE); 3205 #endif 3206 } else { 3207 struct pv_entry *pv; 3208 /* 3209 * New mapping, or changing the backing page 3210 * of an existing mapping. 3211 */ 3212 if (opg) { 3213 struct vm_page_md *omd = VM_PAGE_TO_MD(opg); 3214 paddr_t opa = VM_PAGE_TO_PHYS(opg); 3215 3216 /* 3217 * Replacing an existing mapping with a new one. 3218 * It is part of our managed memory so we 3219 * must remove it from the PV list 3220 */ 3221 pv = pmap_remove_pv(omd, opa, pm, va); 3222 pmap_vac_me_harder(omd, opa, pm, 0); 3223 oflags = pv->pv_flags; 3224 3225 #ifdef PMAP_CACHE_VIVT 3226 /* 3227 * If the old mapping was valid (ref/mod 3228 * emulation creates 'invalid' mappings 3229 * initially) then make sure to frob 3230 * the cache. 3231 */ 3232 if (!(oflags & PVF_NC) && l2pte_valid_p(opte)) { 3233 pmap_cache_wbinv_page(pm, va, true, 3234 oflags); 3235 } 3236 #endif 3237 } else { 3238 pmap_release_page_lock(md); 3239 pv = pool_get(&pmap_pv_pool, PR_NOWAIT); 3240 if (pv == NULL) { 3241 pmap_release_pmap_lock(pm); 3242 if ((flags & PMAP_CANFAIL) == 0) 3243 panic("pmap_enter: " 3244 "no pv entries"); 3245 3246 pmap_free_l2_bucket(pm, l2b, 0); 3247 UVMHIST_LOG(maphist, " <-- done (ENOMEM)", 3248 0, 0, 0, 0); 3249 return (ENOMEM); 3250 } 3251 pmap_acquire_page_lock(md); 3252 } 3253 3254 pmap_enter_pv(md, pa, pv, pm, va, nflags); 3255 } 3256 pmap_release_page_lock(md); 3257 } else { 3258 /* 3259 * We're mapping an unmanaged page. 3260 * These are always readable, and possibly writable, from 3261 * the get go as we don't need to track ref/mod status. 3262 */ 3263 npte |= l2pte_set_readonly(L2_S_PROTO); 3264 if (prot & VM_PROT_WRITE) 3265 npte = l2pte_set_writable(npte); 3266 3267 /* 3268 * Make sure the vector table is mapped cacheable 3269 */ 3270 if ((vector_page_p && !kpm_p) 3271 || (flags & ARM32_MMAP_CACHEABLE)) { 3272 npte |= pte_l2_s_cache_mode; 3273 #ifdef ARM_MMU_EXTENDED 3274 npte &= ~L2_XS_XN; /* and executable */ 3275 #endif 3276 } else if (flags & ARM32_MMAP_WRITECOMBINE) { 3277 npte |= pte_l2_s_wc_mode; 3278 } 3279 if (opg) { 3280 /* 3281 * Looks like there's an existing 'managed' mapping 3282 * at this address. 3283 */ 3284 struct vm_page_md *omd = VM_PAGE_TO_MD(opg); 3285 paddr_t opa = VM_PAGE_TO_PHYS(opg); 3286 3287 pmap_acquire_page_lock(omd); 3288 struct pv_entry *pv = pmap_remove_pv(omd, opa, pm, va); 3289 pmap_vac_me_harder(omd, opa, pm, 0); 3290 oflags = pv->pv_flags; 3291 pmap_release_page_lock(omd); 3292 3293 #ifdef PMAP_CACHE_VIVT 3294 if (!(oflags & PVF_NC) && l2pte_valid_p(opte)) { 3295 pmap_cache_wbinv_page(pm, va, true, oflags); 3296 } 3297 #endif 3298 pool_put(&pmap_pv_pool, pv); 3299 } 3300 } 3301 3302 /* 3303 * Make sure userland mappings get the right permissions 3304 */ 3305 if (!vector_page_p && !kpm_p) { 3306 npte |= L2_S_PROT_U; 3307 #ifdef ARM_MMU_EXTENDED 3308 npte |= L2_XS_nG; /* user pages are not global */ 3309 #endif 3310 } 3311 3312 /* 3313 * Keep the stats up to date 3314 */ 3315 if (opte == 0) { 3316 l2b->l2b_occupancy += PAGE_SIZE / L2_S_SIZE; 3317 pm->pm_stats.resident_count++; 3318 } 3319 3320 UVMHIST_LOG(maphist, " opte %#x npte %#x", opte, npte, 0, 0); 3321 3322 #if defined(ARM_MMU_EXTENDED) 3323 /* 3324 * If exec protection was requested but the page hasn't been synced, 3325 * sync it now and allow execution from it. 3326 */ 3327 if ((nflags & PVF_EXEC) && (npte & L2_XS_XN)) { 3328 struct vm_page_md *md = VM_PAGE_TO_MD(pg); 3329 npte &= ~L2_XS_XN; 3330 pmap_syncicache_page(md, pa); 3331 PMAPCOUNT(exec_synced_map); 3332 } 3333 #endif 3334 /* 3335 * If this is just a wiring change, the two PTEs will be 3336 * identical, so there's no need to update the page table. 3337 */ 3338 if (npte != opte) { 3339 l2pte_reset(ptep); 3340 PTE_SYNC(ptep); 3341 if (l2pte_valid_p(opte)) { 3342 pmap_tlb_flush_SE(pm, va, oflags); 3343 } 3344 l2pte_set(ptep, npte, 0); 3345 PTE_SYNC(ptep); 3346 #ifndef ARM_MMU_EXTENDED 3347 bool is_cached = pmap_is_cached(pm); 3348 if (is_cached) { 3349 /* 3350 * We only need to frob the cache/tlb if this pmap 3351 * is current 3352 */ 3353 if (!vector_page_p && l2pte_valid_p(npte)) { 3354 /* 3355 * This mapping is likely to be accessed as 3356 * soon as we return to userland. Fix up the 3357 * L1 entry to avoid taking another 3358 * page/domain fault. 3359 */ 3360 pd_entry_t *pdep = pmap_l1_kva(pm) 3361 + l1pte_index(va); 3362 pd_entry_t pde = L1_C_PROTO | l2b->l2b_pa 3363 | L1_C_DOM(pmap_domain(pm)); 3364 if (*pdep != pde) { 3365 l1pte_setone(pdep, pde); 3366 PDE_SYNC(pdep); 3367 } 3368 } 3369 } 3370 #endif /* !ARM_MMU_EXTENDED */ 3371 3372 #ifndef ARM_MMU_EXTENDED 3373 UVMHIST_LOG(maphist, " is_cached %d cs 0x%08x\n", 3374 is_cached, pm->pm_cstate.cs_all, 0, 0); 3375 3376 if (pg != NULL) { 3377 struct vm_page_md *md = VM_PAGE_TO_MD(pg); 3378 3379 pmap_acquire_page_lock(md); 3380 pmap_vac_me_harder(md, pa, pm, va); 3381 pmap_release_page_lock(md); 3382 } 3383 #endif 3384 } 3385 #if defined(PMAP_CACHE_VIPT) && defined(DIAGNOSTIC) 3386 if (pg) { 3387 struct vm_page_md *md = VM_PAGE_TO_MD(pg); 3388 3389 pmap_acquire_page_lock(md); 3390 #ifndef ARM_MMU_EXTENDED 3391 KASSERT((md->pvh_attrs & PVF_DMOD) == 0 || (md->pvh_attrs & (PVF_DIRTY|PVF_NC))); 3392 #endif 3393 PMAP_VALIDATE_MD_PAGE(md); 3394 pmap_release_page_lock(md); 3395 } 3396 #endif 3397 3398 pmap_release_pmap_lock(pm); 3399 3400 return (0); 3401 } 3402 3403 /* 3404 * pmap_remove() 3405 * 3406 * pmap_remove is responsible for nuking a number of mappings for a range 3407 * of virtual address space in the current pmap. To do this efficiently 3408 * is interesting, because in a number of cases a wide virtual address 3409 * range may be supplied that contains few actual mappings. So, the 3410 * optimisations are: 3411 * 1. Skip over hunks of address space for which no L1 or L2 entry exists. 3412 * 2. Build up a list of pages we've hit, up to a maximum, so we can 3413 * maybe do just a partial cache clean. This path of execution is 3414 * complicated by the fact that the cache must be flushed _before_ 3415 * the PTE is nuked, being a VAC :-) 3416 * 3. If we're called after UVM calls pmap_remove_all(), we can defer 3417 * all invalidations until pmap_update(), since pmap_remove_all() has 3418 * already flushed the cache. 3419 * 4. Maybe later fast-case a single page, but I don't think this is 3420 * going to make _that_ much difference overall. 3421 */ 3422 3423 #define PMAP_REMOVE_CLEAN_LIST_SIZE 3 3424 3425 void 3426 pmap_remove(pmap_t pm, vaddr_t sva, vaddr_t eva) 3427 { 3428 vaddr_t next_bucket; 3429 u_int cleanlist_idx, total, cnt; 3430 struct { 3431 vaddr_t va; 3432 pt_entry_t *ptep; 3433 } cleanlist[PMAP_REMOVE_CLEAN_LIST_SIZE]; 3434 u_int mappings; 3435 3436 UVMHIST_FUNC(__func__); UVMHIST_CALLED(maphist); 3437 UVMHIST_LOG(maphist, " (pm=%p, sva=%#x, eva=%#x)", pm, sva, eva, 0); 3438 3439 /* 3440 * we lock in the pmap => pv_head direction 3441 */ 3442 pmap_acquire_pmap_lock(pm); 3443 3444 if (pm->pm_remove_all || !pmap_is_cached(pm)) { 3445 cleanlist_idx = PMAP_REMOVE_CLEAN_LIST_SIZE + 1; 3446 #ifndef ARM_MMU_EXTENDED 3447 if (pm->pm_cstate.cs_tlb == 0) 3448 pm->pm_remove_all = true; 3449 #endif 3450 } else 3451 cleanlist_idx = 0; 3452 3453 total = 0; 3454 3455 while (sva < eva) { 3456 /* 3457 * Do one L2 bucket's worth at a time. 3458 */ 3459 next_bucket = L2_NEXT_BUCKET_VA(sva); 3460 if (next_bucket > eva) 3461 next_bucket = eva; 3462 3463 struct l2_bucket * const l2b = pmap_get_l2_bucket(pm, sva); 3464 if (l2b == NULL) { 3465 sva = next_bucket; 3466 continue; 3467 } 3468 3469 pt_entry_t *ptep = &l2b->l2b_kva[l2pte_index(sva)]; 3470 3471 for (mappings = 0; 3472 sva < next_bucket; 3473 sva += PAGE_SIZE, ptep += PAGE_SIZE / L2_S_SIZE) { 3474 pt_entry_t opte = *ptep; 3475 3476 if (opte == 0) { 3477 /* Nothing here, move along */ 3478 continue; 3479 } 3480 3481 u_int flags = PVF_REF; 3482 paddr_t pa = l2pte_pa(opte); 3483 struct vm_page * const pg = PHYS_TO_VM_PAGE(pa); 3484 3485 /* 3486 * Update flags. In a number of circumstances, 3487 * we could cluster a lot of these and do a 3488 * number of sequential pages in one go. 3489 */ 3490 if (pg != NULL) { 3491 struct vm_page_md *md = VM_PAGE_TO_MD(pg); 3492 struct pv_entry *pv; 3493 3494 pmap_acquire_page_lock(md); 3495 pv = pmap_remove_pv(md, pa, pm, sva); 3496 pmap_vac_me_harder(md, pa, pm, 0); 3497 pmap_release_page_lock(md); 3498 if (pv != NULL) { 3499 if (pm->pm_remove_all == false) { 3500 flags = pv->pv_flags; 3501 } 3502 pool_put(&pmap_pv_pool, pv); 3503 } 3504 } 3505 mappings += PAGE_SIZE / L2_S_SIZE; 3506 3507 if (!l2pte_valid_p(opte)) { 3508 /* 3509 * Ref/Mod emulation is still active for this 3510 * mapping, therefore it is has not yet been 3511 * accessed. No need to frob the cache/tlb. 3512 */ 3513 l2pte_reset(ptep); 3514 PTE_SYNC_CURRENT(pm, ptep); 3515 continue; 3516 } 3517 3518 #ifdef ARM_MMU_EXTENDED 3519 if (pm == pmap_kernel()) { 3520 l2pte_reset(ptep); 3521 PTE_SYNC(ptep); 3522 pmap_tlb_flush_SE(pm, sva, flags); 3523 continue; 3524 } 3525 #endif 3526 if (cleanlist_idx < PMAP_REMOVE_CLEAN_LIST_SIZE) { 3527 /* Add to the clean list. */ 3528 cleanlist[cleanlist_idx].ptep = ptep; 3529 cleanlist[cleanlist_idx].va = 3530 sva | (flags & PVF_EXEC); 3531 cleanlist_idx++; 3532 } else if (cleanlist_idx == PMAP_REMOVE_CLEAN_LIST_SIZE) { 3533 /* Nuke everything if needed. */ 3534 #ifdef PMAP_CACHE_VIVT 3535 pmap_cache_wbinv_all(pm, PVF_EXEC); 3536 #endif 3537 /* 3538 * Roll back the previous PTE list, 3539 * and zero out the current PTE. 3540 */ 3541 for (cnt = 0; 3542 cnt < PMAP_REMOVE_CLEAN_LIST_SIZE; cnt++) { 3543 l2pte_reset(cleanlist[cnt].ptep); 3544 PTE_SYNC(cleanlist[cnt].ptep); 3545 } 3546 l2pte_reset(ptep); 3547 PTE_SYNC(ptep); 3548 cleanlist_idx++; 3549 pm->pm_remove_all = true; 3550 } else { 3551 l2pte_reset(ptep); 3552 PTE_SYNC(ptep); 3553 if (pm->pm_remove_all == false) { 3554 pmap_tlb_flush_SE(pm, sva, flags); 3555 } 3556 } 3557 } 3558 3559 /* 3560 * Deal with any left overs 3561 */ 3562 if (cleanlist_idx <= PMAP_REMOVE_CLEAN_LIST_SIZE) { 3563 total += cleanlist_idx; 3564 for (cnt = 0; cnt < cleanlist_idx; cnt++) { 3565 l2pte_reset(cleanlist[cnt].ptep); 3566 PTE_SYNC_CURRENT(pm, cleanlist[cnt].ptep); 3567 #ifdef ARM_MMU_EXTENDED 3568 vaddr_t clva = cleanlist[cnt].va; 3569 pmap_tlb_flush_SE(pm, clva, PVF_REF); 3570 #else 3571 vaddr_t va = cleanlist[cnt].va; 3572 if (pm->pm_cstate.cs_all != 0) { 3573 vaddr_t clva = va & ~PAGE_MASK; 3574 u_int flags = va & PVF_EXEC; 3575 #ifdef PMAP_CACHE_VIVT 3576 pmap_cache_wbinv_page(pm, clva, true, 3577 PVF_REF | PVF_WRITE | flags); 3578 #endif 3579 pmap_tlb_flush_SE(pm, clva, 3580 PVF_REF | flags); 3581 } 3582 #endif /* ARM_MMU_EXTENDED */ 3583 } 3584 3585 /* 3586 * If it looks like we're removing a whole bunch 3587 * of mappings, it's faster to just write-back 3588 * the whole cache now and defer TLB flushes until 3589 * pmap_update() is called. 3590 */ 3591 if (total <= PMAP_REMOVE_CLEAN_LIST_SIZE) 3592 cleanlist_idx = 0; 3593 else { 3594 cleanlist_idx = PMAP_REMOVE_CLEAN_LIST_SIZE + 1; 3595 #ifdef PMAP_CACHE_VIVT 3596 pmap_cache_wbinv_all(pm, PVF_EXEC); 3597 #endif 3598 pm->pm_remove_all = true; 3599 } 3600 } 3601 3602 3603 pmap_free_l2_bucket(pm, l2b, mappings); 3604 pm->pm_stats.resident_count -= mappings / (PAGE_SIZE/L2_S_SIZE); 3605 } 3606 3607 pmap_release_pmap_lock(pm); 3608 } 3609 3610 #if defined(PMAP_CACHE_VIPT) && !defined(ARM_MMU_EXTENDED) 3611 static struct pv_entry * 3612 pmap_kremove_pg(struct vm_page *pg, vaddr_t va) 3613 { 3614 struct vm_page_md *md = VM_PAGE_TO_MD(pg); 3615 paddr_t pa = VM_PAGE_TO_PHYS(pg); 3616 struct pv_entry *pv; 3617 3618 KASSERT(arm_cache_prefer_mask == 0 || md->pvh_attrs & (PVF_COLORED|PVF_NC)); 3619 KASSERT((md->pvh_attrs & PVF_KMPAGE) == 0); 3620 KASSERT(pmap_page_locked_p(md)); 3621 3622 pv = pmap_remove_pv(md, pa, pmap_kernel(), va); 3623 KASSERTMSG(pv, "pg %p (pa #%lx) va %#lx", pg, pa, va); 3624 KASSERT(PV_IS_KENTRY_P(pv->pv_flags)); 3625 3626 /* 3627 * If we are removing a writeable mapping to a cached exec page, 3628 * if it's the last mapping then clear it execness other sync 3629 * the page to the icache. 3630 */ 3631 if ((md->pvh_attrs & (PVF_NC|PVF_EXEC)) == PVF_EXEC 3632 && (pv->pv_flags & PVF_WRITE) != 0) { 3633 if (SLIST_EMPTY(&md->pvh_list)) { 3634 md->pvh_attrs &= ~PVF_EXEC; 3635 PMAPCOUNT(exec_discarded_kremove); 3636 } else { 3637 pmap_syncicache_page(md, pa); 3638 PMAPCOUNT(exec_synced_kremove); 3639 } 3640 } 3641 pmap_vac_me_harder(md, pa, pmap_kernel(), 0); 3642 3643 return pv; 3644 } 3645 #endif /* PMAP_CACHE_VIPT && !ARM_MMU_EXTENDED */ 3646 3647 /* 3648 * pmap_kenter_pa: enter an unmanaged, wired kernel mapping 3649 * 3650 * We assume there is already sufficient KVM space available 3651 * to do this, as we can't allocate L2 descriptor tables/metadata 3652 * from here. 3653 */ 3654 void 3655 pmap_kenter_pa(vaddr_t va, paddr_t pa, vm_prot_t prot, u_int flags) 3656 { 3657 #ifdef PMAP_CACHE_VIVT 3658 struct vm_page *pg = (flags & PMAP_KMPAGE) ? PHYS_TO_VM_PAGE(pa) : NULL; 3659 #endif 3660 #ifdef PMAP_CACHE_VIPT 3661 struct vm_page *pg = PHYS_TO_VM_PAGE(pa); 3662 struct vm_page *opg; 3663 #ifndef ARM_MMU_EXTENDED 3664 struct pv_entry *pv = NULL; 3665 #endif 3666 #endif 3667 struct vm_page_md *md = pg != NULL ? VM_PAGE_TO_MD(pg) : NULL; 3668 3669 UVMHIST_FUNC(__func__); 3670 3671 if (pmap_initialized) { 3672 UVMHIST_CALLED(maphist); 3673 UVMHIST_LOG(maphist, " (va=%#x, pa=%#x, prot=%#x, flags=%#x", 3674 va, pa, prot, flags); 3675 } 3676 3677 pmap_t kpm = pmap_kernel(); 3678 pmap_acquire_pmap_lock(kpm); 3679 struct l2_bucket * const l2b = pmap_get_l2_bucket(kpm, va); 3680 const size_t l1slot __diagused = l1pte_index(va); 3681 KASSERTMSG(l2b != NULL, 3682 "va %#lx pa %#lx prot %d maxkvaddr %#lx: l2 %p l2b %p kva %p", 3683 va, pa, prot, pmap_curmaxkvaddr, kpm->pm_l2[L2_IDX(l1slot)], 3684 kpm->pm_l2[L2_IDX(l1slot)] 3685 ? &kpm->pm_l2[L2_IDX(l1slot)]->l2_bucket[L2_BUCKET(l1slot)] 3686 : NULL, 3687 kpm->pm_l2[L2_IDX(l1slot)] 3688 ? kpm->pm_l2[L2_IDX(l1slot)]->l2_bucket[L2_BUCKET(l1slot)].l2b_kva 3689 : NULL); 3690 KASSERT(l2b->l2b_kva != NULL); 3691 3692 pt_entry_t * const ptep = &l2b->l2b_kva[l2pte_index(va)]; 3693 const pt_entry_t opte = *ptep; 3694 3695 if (opte == 0) { 3696 PMAPCOUNT(kenter_mappings); 3697 l2b->l2b_occupancy += PAGE_SIZE / L2_S_SIZE; 3698 } else { 3699 PMAPCOUNT(kenter_remappings); 3700 #ifdef PMAP_CACHE_VIPT 3701 opg = PHYS_TO_VM_PAGE(l2pte_pa(opte)); 3702 #if !defined(ARM_MMU_EXTENDED) || defined(DIAGNOSTIC) 3703 struct vm_page_md *omd __diagused = VM_PAGE_TO_MD(opg); 3704 #endif 3705 if (opg && arm_cache_prefer_mask != 0) { 3706 KASSERT(opg != pg); 3707 KASSERT((omd->pvh_attrs & PVF_KMPAGE) == 0); 3708 KASSERT((flags & PMAP_KMPAGE) == 0); 3709 #ifndef ARM_MMU_EXTENDED 3710 pmap_acquire_page_lock(omd); 3711 pv = pmap_kremove_pg(opg, va); 3712 pmap_release_page_lock(omd); 3713 #endif 3714 } 3715 #endif 3716 if (l2pte_valid_p(opte)) { 3717 l2pte_reset(ptep); 3718 PTE_SYNC(ptep); 3719 #ifdef PMAP_CACHE_VIVT 3720 cpu_dcache_wbinv_range(va, PAGE_SIZE); 3721 #endif 3722 cpu_tlb_flushD_SE(va); 3723 cpu_cpwait(); 3724 } 3725 } 3726 pmap_release_pmap_lock(kpm); 3727 3728 pt_entry_t npte = L2_S_PROTO | pa | L2_S_PROT(PTE_KERNEL, prot) 3729 | ((flags & PMAP_NOCACHE) 3730 ? 0 3731 : ((flags & PMAP_PTE) 3732 ? pte_l2_s_cache_mode_pt : pte_l2_s_cache_mode)); 3733 #ifdef ARM_MMU_EXTENDED 3734 if (prot & VM_PROT_EXECUTE) 3735 npte &= ~L2_XS_XN; 3736 #endif 3737 l2pte_set(ptep, npte, 0); 3738 PTE_SYNC(ptep); 3739 3740 if (pg) { 3741 if (flags & PMAP_KMPAGE) { 3742 KASSERT(md->urw_mappings == 0); 3743 KASSERT(md->uro_mappings == 0); 3744 KASSERT(md->krw_mappings == 0); 3745 KASSERT(md->kro_mappings == 0); 3746 #if defined(PMAP_CACHE_VIPT) && !defined(ARM_MMU_EXTENDED) 3747 KASSERT(pv == NULL); 3748 KASSERT(arm_cache_prefer_mask == 0 || (va & PVF_COLORED) == 0); 3749 KASSERT((md->pvh_attrs & PVF_NC) == 0); 3750 /* if there is a color conflict, evict from cache. */ 3751 if (pmap_is_page_colored_p(md) 3752 && ((va ^ md->pvh_attrs) & arm_cache_prefer_mask)) { 3753 PMAPCOUNT(vac_color_change); 3754 pmap_flush_page(md, pa, PMAP_FLUSH_PRIMARY); 3755 } else if (md->pvh_attrs & PVF_MULTCLR) { 3756 /* 3757 * If this page has multiple colors, expunge 3758 * them. 3759 */ 3760 PMAPCOUNT(vac_flush_lots2); 3761 pmap_flush_page(md, pa, PMAP_FLUSH_SECONDARY); 3762 } 3763 /* 3764 * Since this is a KMPAGE, there can be no contention 3765 * for this page so don't lock it. 3766 */ 3767 md->pvh_attrs &= PAGE_SIZE - 1; 3768 md->pvh_attrs |= PVF_KMPAGE | PVF_COLORED | PVF_DIRTY 3769 | (va & arm_cache_prefer_mask); 3770 #else /* !PMAP_CACHE_VIPT || ARM_MMU_EXTENDED */ 3771 md->pvh_attrs |= PVF_KMPAGE; 3772 #endif 3773 atomic_inc_32(&pmap_kmpages); 3774 #if defined(PMAP_CACHE_VIPT) && !defined(ARM_MMU_EXTENDED) 3775 } else if (arm_cache_prefer_mask != 0) { 3776 if (pv == NULL) { 3777 pv = pool_get(&pmap_pv_pool, PR_NOWAIT); 3778 KASSERT(pv != NULL); 3779 } 3780 pmap_acquire_page_lock(md); 3781 pmap_enter_pv(md, pa, pv, pmap_kernel(), va, 3782 PVF_WIRED | PVF_KENTRY 3783 | (prot & VM_PROT_WRITE ? PVF_WRITE : 0)); 3784 if ((prot & VM_PROT_WRITE) 3785 && !(md->pvh_attrs & PVF_NC)) 3786 md->pvh_attrs |= PVF_DIRTY; 3787 KASSERT((prot & VM_PROT_WRITE) == 0 || (md->pvh_attrs & (PVF_DIRTY|PVF_NC))); 3788 pmap_vac_me_harder(md, pa, pmap_kernel(), va); 3789 pmap_release_page_lock(md); 3790 #endif 3791 } 3792 #if defined(PMAP_CACHE_VIPT) && !defined(ARM_MMU_EXTENDED) 3793 } else { 3794 if (pv != NULL) 3795 pool_put(&pmap_pv_pool, pv); 3796 #endif 3797 } 3798 #if defined(PMAP_CACHE_VIPT) && !defined(ARM_MMU_EXTENDED) 3799 KASSERT(md == NULL || !pmap_page_locked_p(md)); 3800 #endif 3801 if (pmap_initialized) { 3802 UVMHIST_LOG(maphist, " <-- done (ptep %p: %#x -> %#x)", 3803 ptep, opte, npte, 0); 3804 } 3805 3806 } 3807 3808 void 3809 pmap_kremove(vaddr_t va, vsize_t len) 3810 { 3811 #ifdef UVMHIST 3812 u_int total_mappings = 0; 3813 #endif 3814 3815 PMAPCOUNT(kenter_unmappings); 3816 3817 UVMHIST_FUNC(__func__); UVMHIST_CALLED(maphist); 3818 3819 UVMHIST_LOG(maphist, " (va=%#x, len=%#x)", va, len, 0, 0); 3820 3821 const vaddr_t eva = va + len; 3822 3823 pmap_acquire_pmap_lock(pmap_kernel()); 3824 3825 while (va < eva) { 3826 vaddr_t next_bucket = L2_NEXT_BUCKET_VA(va); 3827 if (next_bucket > eva) 3828 next_bucket = eva; 3829 3830 pmap_t kpm = pmap_kernel(); 3831 struct l2_bucket * const l2b = pmap_get_l2_bucket(kpm, va); 3832 KDASSERT(l2b != NULL); 3833 3834 pt_entry_t * const sptep = &l2b->l2b_kva[l2pte_index(va)]; 3835 pt_entry_t *ptep = sptep; 3836 u_int mappings = 0; 3837 3838 while (va < next_bucket) { 3839 const pt_entry_t opte = *ptep; 3840 struct vm_page *opg = PHYS_TO_VM_PAGE(l2pte_pa(opte)); 3841 if (opg != NULL) { 3842 struct vm_page_md *omd = VM_PAGE_TO_MD(opg); 3843 3844 if (omd->pvh_attrs & PVF_KMPAGE) { 3845 KASSERT(omd->urw_mappings == 0); 3846 KASSERT(omd->uro_mappings == 0); 3847 KASSERT(omd->krw_mappings == 0); 3848 KASSERT(omd->kro_mappings == 0); 3849 omd->pvh_attrs &= ~PVF_KMPAGE; 3850 #if defined(PMAP_CACHE_VIPT) && !defined(ARM_MMU_EXTENDED) 3851 if (arm_cache_prefer_mask != 0) { 3852 omd->pvh_attrs &= ~PVF_WRITE; 3853 } 3854 #endif 3855 atomic_dec_32(&pmap_kmpages); 3856 #if defined(PMAP_CACHE_VIPT) && !defined(ARM_MMU_EXTENDED) 3857 } else if (arm_cache_prefer_mask != 0) { 3858 pmap_acquire_page_lock(omd); 3859 pool_put(&pmap_pv_pool, 3860 pmap_kremove_pg(opg, va)); 3861 pmap_release_page_lock(omd); 3862 #endif 3863 } 3864 } 3865 if (l2pte_valid_p(opte)) { 3866 l2pte_reset(ptep); 3867 PTE_SYNC(ptep); 3868 #ifdef PMAP_CACHE_VIVT 3869 cpu_dcache_wbinv_range(va, PAGE_SIZE); 3870 #endif 3871 cpu_tlb_flushD_SE(va); 3872 3873 mappings += PAGE_SIZE / L2_S_SIZE; 3874 } 3875 va += PAGE_SIZE; 3876 ptep += PAGE_SIZE / L2_S_SIZE; 3877 } 3878 KDASSERTMSG(mappings <= l2b->l2b_occupancy, "%u %u", 3879 mappings, l2b->l2b_occupancy); 3880 l2b->l2b_occupancy -= mappings; 3881 //PTE_SYNC_RANGE(sptep, (u_int)(ptep - sptep)); 3882 #ifdef UVMHIST 3883 total_mappings += mappings; 3884 #endif 3885 } 3886 pmap_release_pmap_lock(pmap_kernel()); 3887 cpu_cpwait(); 3888 UVMHIST_LOG(maphist, " <--- done (%u mappings removed)", 3889 total_mappings, 0, 0, 0); 3890 } 3891 3892 bool 3893 pmap_extract(pmap_t pm, vaddr_t va, paddr_t *pap) 3894 { 3895 struct l2_dtable *l2; 3896 pd_entry_t *pdep, pde; 3897 pt_entry_t *ptep, pte; 3898 paddr_t pa; 3899 u_int l1slot; 3900 3901 pmap_acquire_pmap_lock(pm); 3902 3903 l1slot = l1pte_index(va); 3904 pdep = pmap_l1_kva(pm) + l1slot; 3905 pde = *pdep; 3906 3907 if (l1pte_section_p(pde)) { 3908 /* 3909 * These should only happen for pmap_kernel() 3910 */ 3911 KDASSERT(pm == pmap_kernel()); 3912 pmap_release_pmap_lock(pm); 3913 #if (ARM_MMU_V6 + ARM_MMU_V7) > 0 3914 if (l1pte_supersection_p(pde)) { 3915 pa = (pde & L1_SS_FRAME) | (va & L1_SS_OFFSET); 3916 } else 3917 #endif 3918 pa = (pde & L1_S_FRAME) | (va & L1_S_OFFSET); 3919 } else { 3920 /* 3921 * Note that we can't rely on the validity of the L1 3922 * descriptor as an indication that a mapping exists. 3923 * We have to look it up in the L2 dtable. 3924 */ 3925 l2 = pm->pm_l2[L2_IDX(l1slot)]; 3926 3927 if (l2 == NULL || 3928 (ptep = l2->l2_bucket[L2_BUCKET(l1slot)].l2b_kva) == NULL) { 3929 pmap_release_pmap_lock(pm); 3930 return false; 3931 } 3932 3933 pte = ptep[l2pte_index(va)]; 3934 pmap_release_pmap_lock(pm); 3935 3936 if (pte == 0) 3937 return false; 3938 3939 switch (pte & L2_TYPE_MASK) { 3940 case L2_TYPE_L: 3941 pa = (pte & L2_L_FRAME) | (va & L2_L_OFFSET); 3942 break; 3943 3944 default: 3945 pa = (pte & ~PAGE_MASK) | (va & PAGE_MASK); 3946 break; 3947 } 3948 } 3949 3950 if (pap != NULL) 3951 *pap = pa; 3952 3953 return true; 3954 } 3955 3956 /* 3957 * pmap_pv_remove: remove an unmanaged pv-tracked page from all pmaps 3958 * that map it 3959 */ 3960 3961 static void 3962 pmap_pv_remove(paddr_t pa) 3963 { 3964 struct pmap_page *pp; 3965 3966 pp = pmap_pv_tracked(pa); 3967 if (pp == NULL) 3968 panic("pmap_pv_protect: page not pv-tracked: 0x%"PRIxPADDR, 3969 pa); 3970 3971 struct vm_page_md *md = PMAP_PAGE_TO_MD(pp); 3972 pmap_page_remove(md, pa); 3973 } 3974 3975 void 3976 pmap_pv_protect(paddr_t pa, vm_prot_t prot) 3977 { 3978 3979 /* the only case is remove at the moment */ 3980 KASSERT(prot == VM_PROT_NONE); 3981 pmap_pv_remove(pa); 3982 } 3983 3984 void 3985 pmap_protect(pmap_t pm, vaddr_t sva, vaddr_t eva, vm_prot_t prot) 3986 { 3987 struct l2_bucket *l2b; 3988 vaddr_t next_bucket; 3989 3990 NPDEBUG(PDB_PROTECT, 3991 printf("pmap_protect: pm %p sva 0x%lx eva 0x%lx prot 0x%x\n", 3992 pm, sva, eva, prot)); 3993 3994 if ((prot & VM_PROT_READ) == 0) { 3995 pmap_remove(pm, sva, eva); 3996 return; 3997 } 3998 3999 if (prot & VM_PROT_WRITE) { 4000 /* 4001 * If this is a read->write transition, just ignore it and let 4002 * uvm_fault() take care of it later. 4003 */ 4004 return; 4005 } 4006 4007 pmap_acquire_pmap_lock(pm); 4008 4009 #ifndef ARM_MMU_EXTENDED 4010 const bool flush = eva - sva >= PAGE_SIZE * 4; 4011 u_int flags = 0; 4012 #endif 4013 u_int clr_mask = PVF_WRITE | ((prot & VM_PROT_EXECUTE) ? 0 : PVF_EXEC); 4014 4015 while (sva < eva) { 4016 next_bucket = L2_NEXT_BUCKET_VA(sva); 4017 if (next_bucket > eva) 4018 next_bucket = eva; 4019 4020 l2b = pmap_get_l2_bucket(pm, sva); 4021 if (l2b == NULL) { 4022 sva = next_bucket; 4023 continue; 4024 } 4025 4026 pt_entry_t *ptep = &l2b->l2b_kva[l2pte_index(sva)]; 4027 4028 while (sva < next_bucket) { 4029 const pt_entry_t opte = *ptep; 4030 if (l2pte_valid_p(opte) && l2pte_writable_p(opte)) { 4031 struct vm_page *pg; 4032 #ifndef ARM_MMU_EXTENDED 4033 u_int f; 4034 #endif 4035 4036 #ifdef PMAP_CACHE_VIVT 4037 /* 4038 * OK, at this point, we know we're doing 4039 * write-protect operation. If the pmap is 4040 * active, write-back the page. 4041 */ 4042 pmap_cache_wbinv_page(pm, sva, false, 4043 PVF_REF | PVF_WRITE); 4044 #endif 4045 4046 pg = PHYS_TO_VM_PAGE(l2pte_pa(opte)); 4047 pt_entry_t npte = l2pte_set_readonly(opte); 4048 l2pte_reset(ptep); 4049 PTE_SYNC(ptep); 4050 #ifdef ARM_MMU_EXTENDED 4051 pmap_tlb_flush_SE(pm, sva, PVF_REF); 4052 #endif 4053 l2pte_set(ptep, npte, 0); 4054 PTE_SYNC(ptep); 4055 4056 if (pg != NULL) { 4057 struct vm_page_md *md = VM_PAGE_TO_MD(pg); 4058 paddr_t pa = VM_PAGE_TO_PHYS(pg); 4059 4060 pmap_acquire_page_lock(md); 4061 #ifndef ARM_MMU_EXTENDED 4062 f = 4063 #endif 4064 pmap_modify_pv(md, pa, pm, sva, 4065 clr_mask, 0); 4066 pmap_vac_me_harder(md, pa, pm, sva); 4067 pmap_release_page_lock(md); 4068 #ifndef ARM_MMU_EXTENDED 4069 } else { 4070 f = PVF_REF | PVF_EXEC; 4071 } 4072 4073 if (flush) { 4074 flags |= f; 4075 } else { 4076 pmap_tlb_flush_SE(pm, sva, f); 4077 #endif 4078 } 4079 } 4080 4081 sva += PAGE_SIZE; 4082 ptep += PAGE_SIZE / L2_S_SIZE; 4083 } 4084 } 4085 4086 #ifndef ARM_MMU_EXTENDED 4087 if (flush) { 4088 if (PV_BEEN_EXECD(flags)) { 4089 pmap_tlb_flushID(pm); 4090 } else if (PV_BEEN_REFD(flags)) { 4091 pmap_tlb_flushD(pm); 4092 } 4093 } 4094 #endif 4095 4096 pmap_release_pmap_lock(pm); 4097 } 4098 4099 void 4100 pmap_icache_sync_range(pmap_t pm, vaddr_t sva, vaddr_t eva) 4101 { 4102 struct l2_bucket *l2b; 4103 pt_entry_t *ptep; 4104 vaddr_t next_bucket; 4105 vsize_t page_size = trunc_page(sva) + PAGE_SIZE - sva; 4106 4107 NPDEBUG(PDB_EXEC, 4108 printf("pmap_icache_sync_range: pm %p sva 0x%lx eva 0x%lx\n", 4109 pm, sva, eva)); 4110 4111 pmap_acquire_pmap_lock(pm); 4112 4113 while (sva < eva) { 4114 next_bucket = L2_NEXT_BUCKET_VA(sva); 4115 if (next_bucket > eva) 4116 next_bucket = eva; 4117 4118 l2b = pmap_get_l2_bucket(pm, sva); 4119 if (l2b == NULL) { 4120 sva = next_bucket; 4121 continue; 4122 } 4123 4124 for (ptep = &l2b->l2b_kva[l2pte_index(sva)]; 4125 sva < next_bucket; 4126 sva += page_size, 4127 ptep += PAGE_SIZE / L2_S_SIZE, 4128 page_size = PAGE_SIZE) { 4129 if (l2pte_valid_p(*ptep)) { 4130 cpu_icache_sync_range(sva, 4131 min(page_size, eva - sva)); 4132 } 4133 } 4134 } 4135 4136 pmap_release_pmap_lock(pm); 4137 } 4138 4139 void 4140 pmap_page_protect(struct vm_page *pg, vm_prot_t prot) 4141 { 4142 struct vm_page_md *md = VM_PAGE_TO_MD(pg); 4143 paddr_t pa = VM_PAGE_TO_PHYS(pg); 4144 4145 NPDEBUG(PDB_PROTECT, 4146 printf("pmap_page_protect: md %p (0x%08lx), prot 0x%x\n", 4147 md, pa, prot)); 4148 4149 switch(prot) { 4150 case VM_PROT_READ|VM_PROT_WRITE: 4151 #if defined(ARM_MMU_EXTENDED) 4152 pmap_acquire_page_lock(md); 4153 pmap_clearbit(md, pa, PVF_EXEC); 4154 pmap_release_page_lock(md); 4155 break; 4156 #endif 4157 case VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE: 4158 break; 4159 4160 case VM_PROT_READ: 4161 #if defined(ARM_MMU_EXTENDED) 4162 pmap_acquire_page_lock(md); 4163 pmap_clearbit(md, pa, PVF_WRITE|PVF_EXEC); 4164 pmap_release_page_lock(md); 4165 break; 4166 #endif 4167 case VM_PROT_READ|VM_PROT_EXECUTE: 4168 pmap_acquire_page_lock(md); 4169 pmap_clearbit(md, pa, PVF_WRITE); 4170 pmap_release_page_lock(md); 4171 break; 4172 4173 default: 4174 pmap_page_remove(md, pa); 4175 break; 4176 } 4177 } 4178 4179 /* 4180 * pmap_clear_modify: 4181 * 4182 * Clear the "modified" attribute for a page. 4183 */ 4184 bool 4185 pmap_clear_modify(struct vm_page *pg) 4186 { 4187 struct vm_page_md *md = VM_PAGE_TO_MD(pg); 4188 paddr_t pa = VM_PAGE_TO_PHYS(pg); 4189 bool rv; 4190 4191 pmap_acquire_page_lock(md); 4192 4193 if (md->pvh_attrs & PVF_MOD) { 4194 rv = true; 4195 #if defined(PMAP_CACHE_VIPT) && !defined(ARM_MMU_EXTENDED) 4196 /* 4197 * If we are going to clear the modified bit and there are 4198 * no other modified bits set, flush the page to memory and 4199 * mark it clean. 4200 */ 4201 if ((md->pvh_attrs & (PVF_DMOD|PVF_NC)) == PVF_MOD) 4202 pmap_flush_page(md, pa, PMAP_CLEAN_PRIMARY); 4203 #endif 4204 pmap_clearbit(md, pa, PVF_MOD); 4205 } else { 4206 rv = false; 4207 } 4208 pmap_release_page_lock(md); 4209 4210 return rv; 4211 } 4212 4213 /* 4214 * pmap_clear_reference: 4215 * 4216 * Clear the "referenced" attribute for a page. 4217 */ 4218 bool 4219 pmap_clear_reference(struct vm_page *pg) 4220 { 4221 struct vm_page_md *md = VM_PAGE_TO_MD(pg); 4222 paddr_t pa = VM_PAGE_TO_PHYS(pg); 4223 bool rv; 4224 4225 pmap_acquire_page_lock(md); 4226 4227 if (md->pvh_attrs & PVF_REF) { 4228 rv = true; 4229 pmap_clearbit(md, pa, PVF_REF); 4230 } else { 4231 rv = false; 4232 } 4233 pmap_release_page_lock(md); 4234 4235 return rv; 4236 } 4237 4238 /* 4239 * pmap_is_modified: 4240 * 4241 * Test if a page has the "modified" attribute. 4242 */ 4243 /* See <arm/arm32/pmap.h> */ 4244 4245 /* 4246 * pmap_is_referenced: 4247 * 4248 * Test if a page has the "referenced" attribute. 4249 */ 4250 /* See <arm/arm32/pmap.h> */ 4251 4252 #if defined(ARM_MMU_EXTENDED) && 0 4253 int 4254 pmap_prefetchabt_fixup(void *v) 4255 { 4256 struct trapframe * const tf = v; 4257 vaddr_t va = trunc_page(tf->tf_pc); 4258 int rv = ABORT_FIXUP_FAILED; 4259 4260 if (!TRAP_USERMODE(tf) && va < VM_MAXUSER_ADDRESS) 4261 return rv; 4262 4263 kpreempt_disable(); 4264 pmap_t pm = curcpu()->ci_pmap_cur; 4265 const size_t l1slot = l1pte_index(va); 4266 struct l2_dtable * const l2 = pm->pm_l2[L2_IDX(l1slot)]; 4267 if (l2 == NULL) 4268 goto out; 4269 4270 struct l2_bucket * const l2b = &l2->l2_bucket[L2_BUCKET(l1slot)]; 4271 if (l2b->l2b_kva == NULL) 4272 goto out; 4273 4274 /* 4275 * Check the PTE itself. 4276 */ 4277 pt_entry_t * const ptep = &l2b->l2b_kva[l2pte_index(va)]; 4278 const pt_entry_t opte = *ptep; 4279 if ((opte & L2_S_PROT_U) == 0 || (opte & L2_XS_XN) == 0) 4280 goto out; 4281 4282 paddr_t pa = l2pte_pa(pte); 4283 struct vm_page * const pg = PHYS_TO_VM_PAGE(pa); 4284 KASSERT(pg != NULL); 4285 4286 struct vm_page_md * const md = VM_PAGE_TO_MD(pg); 4287 4288 pmap_acquire_page_lock(md); 4289 struct pv_entry * const pv = pmap_find_pv(md, pm, va); 4290 KASSERT(pv != NULL); 4291 4292 if (PV_IS_EXEC_P(pv->pv_flags)) { 4293 l2pte_reset(ptep); 4294 PTE_SYNC(ptep); 4295 pmap_tlb_flush_SE(pm, va, PVF_EXEC | PVF_REF); 4296 if (!PV_IS_EXEC_P(md->pvh_attrs)) { 4297 pmap_syncicache_page(md, pa); 4298 } 4299 rv = ABORT_FIXUP_RETURN; 4300 l2pte_set(ptep, opte & ~L2_XS_XN, 0); 4301 PTE_SYNC(ptep); 4302 } 4303 pmap_release_page_lock(md); 4304 4305 out: 4306 kpreempt_enable(); 4307 return rv; 4308 } 4309 #endif 4310 4311 int 4312 pmap_fault_fixup(pmap_t pm, vaddr_t va, vm_prot_t ftype, int user) 4313 { 4314 struct l2_dtable *l2; 4315 struct l2_bucket *l2b; 4316 paddr_t pa; 4317 const size_t l1slot = l1pte_index(va); 4318 int rv = 0; 4319 4320 UVMHIST_FUNC(__func__); UVMHIST_CALLED(maphist); 4321 4322 va = trunc_page(va); 4323 4324 KASSERT(!user || (pm != pmap_kernel())); 4325 4326 UVMHIST_LOG(maphist, " (pm=%#x, va=%#x, ftype=%#x, user=%d)", 4327 pm, va, ftype, user); 4328 #ifdef ARM_MMU_EXTENDED 4329 UVMHIST_LOG(maphist, " ti=%#x pai=%#x asid=%#x", 4330 cpu_tlb_info(curcpu()), PMAP_PAI(pm, cpu_tlb_info(curcpu())), 4331 PMAP_PAI(pm, cpu_tlb_info(curcpu()))->pai_asid, 0); 4332 #endif 4333 4334 pmap_acquire_pmap_lock(pm); 4335 4336 /* 4337 * If there is no l2_dtable for this address, then the process 4338 * has no business accessing it. 4339 * 4340 * Note: This will catch userland processes trying to access 4341 * kernel addresses. 4342 */ 4343 l2 = pm->pm_l2[L2_IDX(l1slot)]; 4344 if (l2 == NULL) { 4345 UVMHIST_LOG(maphist, " no l2 for l1slot %#x", l1slot, 0, 0, 0); 4346 goto out; 4347 } 4348 4349 /* 4350 * Likewise if there is no L2 descriptor table 4351 */ 4352 l2b = &l2->l2_bucket[L2_BUCKET(l1slot)]; 4353 if (l2b->l2b_kva == NULL) { 4354 UVMHIST_LOG(maphist, " <-- done (no ptep for l1slot %#x)", l1slot, 0, 0, 0); 4355 goto out; 4356 } 4357 4358 /* 4359 * Check the PTE itself. 4360 */ 4361 pt_entry_t * const ptep = &l2b->l2b_kva[l2pte_index(va)]; 4362 pt_entry_t const opte = *ptep; 4363 if (opte == 0 || (opte & L2_TYPE_MASK) == L2_TYPE_L) { 4364 UVMHIST_LOG(maphist, " <-- done (empty pde for l1slot %#x)", l1slot, 0, 0, 0); 4365 goto out; 4366 } 4367 4368 #ifndef ARM_HAS_VBAR 4369 /* 4370 * Catch a userland access to the vector page mapped at 0x0 4371 */ 4372 if (user && (opte & L2_S_PROT_U) == 0) { 4373 UVMHIST_LOG(maphist, " <-- done (vector_page)", 0, 0, 0, 0); 4374 goto out; 4375 } 4376 #endif 4377 4378 pa = l2pte_pa(opte); 4379 4380 if ((ftype & VM_PROT_WRITE) && !l2pte_writable_p(opte)) { 4381 /* 4382 * This looks like a good candidate for "page modified" 4383 * emulation... 4384 */ 4385 struct pv_entry *pv; 4386 struct vm_page *pg; 4387 4388 /* Extract the physical address of the page */ 4389 if ((pg = PHYS_TO_VM_PAGE(pa)) == NULL) { 4390 UVMHIST_LOG(maphist, " <-- done (mod/ref unmanaged page)", 0, 0, 0, 0); 4391 goto out; 4392 } 4393 4394 struct vm_page_md *md = VM_PAGE_TO_MD(pg); 4395 4396 /* Get the current flags for this page. */ 4397 pmap_acquire_page_lock(md); 4398 pv = pmap_find_pv(md, pm, va); 4399 if (pv == NULL || PV_IS_KENTRY_P(pv->pv_flags)) { 4400 pmap_release_page_lock(md); 4401 UVMHIST_LOG(maphist, " <-- done (mod/ref emul: no PV)", 0, 0, 0, 0); 4402 goto out; 4403 } 4404 4405 /* 4406 * Do the flags say this page is writable? If not then it 4407 * is a genuine write fault. If yes then the write fault is 4408 * our fault as we did not reflect the write access in the 4409 * PTE. Now we know a write has occurred we can correct this 4410 * and also set the modified bit 4411 */ 4412 if ((pv->pv_flags & PVF_WRITE) == 0) { 4413 pmap_release_page_lock(md); 4414 goto out; 4415 } 4416 4417 md->pvh_attrs |= PVF_REF | PVF_MOD; 4418 pv->pv_flags |= PVF_REF | PVF_MOD; 4419 #if defined(PMAP_CACHE_VIPT) && !defined(ARM_MMU_EXTENDED) 4420 /* 4421 * If there are cacheable mappings for this page, mark it dirty. 4422 */ 4423 if ((md->pvh_attrs & PVF_NC) == 0) 4424 md->pvh_attrs |= PVF_DIRTY; 4425 #endif 4426 #ifdef ARM_MMU_EXTENDED 4427 if (md->pvh_attrs & PVF_EXEC) { 4428 md->pvh_attrs &= ~PVF_EXEC; 4429 PMAPCOUNT(exec_discarded_modfixup); 4430 } 4431 #endif 4432 pmap_release_page_lock(md); 4433 4434 /* 4435 * Re-enable write permissions for the page. No need to call 4436 * pmap_vac_me_harder(), since this is just a 4437 * modified-emulation fault, and the PVF_WRITE bit isn't 4438 * changing. We've already set the cacheable bits based on 4439 * the assumption that we can write to this page. 4440 */ 4441 const pt_entry_t npte = 4442 l2pte_set_writable((opte & ~L2_TYPE_MASK) | L2_S_PROTO) 4443 #ifdef ARM_MMU_EXTENDED 4444 | (pm != pmap_kernel() ? L2_XS_nG : 0) 4445 #endif 4446 | 0; 4447 l2pte_reset(ptep); 4448 PTE_SYNC(ptep); 4449 pmap_tlb_flush_SE(pm, va, 4450 (ftype & VM_PROT_EXECUTE) ? PVF_EXEC | PVF_REF : PVF_REF); 4451 l2pte_set(ptep, npte, 0); 4452 PTE_SYNC(ptep); 4453 PMAPCOUNT(fixup_mod); 4454 rv = 1; 4455 UVMHIST_LOG(maphist, " <-- done (mod/ref emul: changed pte from %#x to %#x)", 4456 opte, npte, 0, 0); 4457 } else if ((opte & L2_TYPE_MASK) == L2_TYPE_INV) { 4458 /* 4459 * This looks like a good candidate for "page referenced" 4460 * emulation. 4461 */ 4462 struct vm_page *pg; 4463 4464 /* Extract the physical address of the page */ 4465 if ((pg = PHYS_TO_VM_PAGE(pa)) == NULL) { 4466 UVMHIST_LOG(maphist, " <-- done (ref emul: unmanaged page)", 0, 0, 0, 0); 4467 goto out; 4468 } 4469 4470 struct vm_page_md *md = VM_PAGE_TO_MD(pg); 4471 4472 /* Get the current flags for this page. */ 4473 pmap_acquire_page_lock(md); 4474 struct pv_entry *pv = pmap_find_pv(md, pm, va); 4475 if (pv == NULL || PV_IS_KENTRY_P(pv->pv_flags)) { 4476 pmap_release_page_lock(md); 4477 UVMHIST_LOG(maphist, " <-- done (ref emul no PV)", 0, 0, 0, 0); 4478 goto out; 4479 } 4480 4481 md->pvh_attrs |= PVF_REF; 4482 pv->pv_flags |= PVF_REF; 4483 4484 pt_entry_t npte = 4485 l2pte_set_readonly((opte & ~L2_TYPE_MASK) | L2_S_PROTO); 4486 #ifdef ARM_MMU_EXTENDED 4487 if (pm != pmap_kernel()) { 4488 npte |= L2_XS_nG; 4489 } 4490 /* 4491 * If we got called from prefetch abort, then ftype will have 4492 * VM_PROT_EXECUTE set. Now see if we have no-execute set in 4493 * the PTE. 4494 */ 4495 if (user && (ftype & VM_PROT_EXECUTE) && (npte & L2_XS_XN)) { 4496 /* 4497 * Is this a mapping of an executable page? 4498 */ 4499 if ((pv->pv_flags & PVF_EXEC) == 0) { 4500 pmap_release_page_lock(md); 4501 UVMHIST_LOG(maphist, " <-- done (ref emul: no exec)", 4502 0, 0, 0, 0); 4503 goto out; 4504 } 4505 /* 4506 * If we haven't synced the page, do so now. 4507 */ 4508 if ((md->pvh_attrs & PVF_EXEC) == 0) { 4509 UVMHIST_LOG(maphist, " ref emul: syncicache page #%#x", 4510 pa, 0, 0, 0); 4511 pmap_syncicache_page(md, pa); 4512 PMAPCOUNT(fixup_exec); 4513 } 4514 npte &= ~L2_XS_XN; 4515 } 4516 #endif /* ARM_MMU_EXTENDED */ 4517 pmap_release_page_lock(md); 4518 l2pte_reset(ptep); 4519 PTE_SYNC(ptep); 4520 pmap_tlb_flush_SE(pm, va, 4521 (ftype & VM_PROT_EXECUTE) ? PVF_EXEC | PVF_REF : PVF_REF); 4522 l2pte_set(ptep, npte, 0); 4523 PTE_SYNC(ptep); 4524 PMAPCOUNT(fixup_ref); 4525 rv = 1; 4526 UVMHIST_LOG(maphist, " <-- done (ref emul: changed pte from %#x to %#x)", 4527 opte, npte, 0, 0); 4528 #ifdef ARM_MMU_EXTENDED 4529 } else if (user && (ftype & VM_PROT_EXECUTE) && (opte & L2_XS_XN)) { 4530 struct vm_page * const pg = PHYS_TO_VM_PAGE(pa); 4531 if (pg == NULL) { 4532 UVMHIST_LOG(maphist, " <-- done (unmanaged page)", 0, 0, 0, 0); 4533 goto out; 4534 } 4535 4536 struct vm_page_md * const md = VM_PAGE_TO_MD(pg); 4537 4538 /* Get the current flags for this page. */ 4539 pmap_acquire_page_lock(md); 4540 struct pv_entry * const pv = pmap_find_pv(md, pm, va); 4541 if (pv == NULL || (pv->pv_flags & PVF_EXEC) == 0) { 4542 pmap_release_page_lock(md); 4543 UVMHIST_LOG(maphist, " <-- done (no PV or not EXEC)", 0, 0, 0, 0); 4544 goto out; 4545 } 4546 4547 /* 4548 * If we haven't synced the page, do so now. 4549 */ 4550 if ((md->pvh_attrs & PVF_EXEC) == 0) { 4551 UVMHIST_LOG(maphist, "syncicache page #%#x", 4552 pa, 0, 0, 0); 4553 pmap_syncicache_page(md, pa); 4554 } 4555 pmap_release_page_lock(md); 4556 /* 4557 * Turn off no-execute. 4558 */ 4559 KASSERT(opte & L2_XS_nG); 4560 l2pte_reset(ptep); 4561 PTE_SYNC(ptep); 4562 pmap_tlb_flush_SE(pm, va, PVF_EXEC | PVF_REF); 4563 l2pte_set(ptep, opte & ~L2_XS_XN, 0); 4564 PTE_SYNC(ptep); 4565 rv = 1; 4566 PMAPCOUNT(fixup_exec); 4567 UVMHIST_LOG(maphist, "exec: changed pte from %#x to %#x", 4568 opte, opte & ~L2_XS_XN, 0, 0); 4569 #endif 4570 } 4571 4572 #ifndef ARM_MMU_EXTENDED 4573 /* 4574 * We know there is a valid mapping here, so simply 4575 * fix up the L1 if necessary. 4576 */ 4577 pd_entry_t * const pdep = pmap_l1_kva(pm) + l1slot; 4578 pd_entry_t pde = L1_C_PROTO | l2b->l2b_pa | L1_C_DOM(pmap_domain(pm)); 4579 if (*pdep != pde) { 4580 l1pte_setone(pdep, pde); 4581 PDE_SYNC(pdep); 4582 rv = 1; 4583 PMAPCOUNT(fixup_pdes); 4584 } 4585 #endif 4586 4587 #ifdef CPU_SA110 4588 /* 4589 * There are bugs in the rev K SA110. This is a check for one 4590 * of them. 4591 */ 4592 if (rv == 0 && curcpu()->ci_arm_cputype == CPU_ID_SA110 && 4593 curcpu()->ci_arm_cpurev < 3) { 4594 /* Always current pmap */ 4595 if (l2pte_valid_p(opte)) { 4596 extern int kernel_debug; 4597 if (kernel_debug & 1) { 4598 struct proc *p = curlwp->l_proc; 4599 printf("prefetch_abort: page is already " 4600 "mapped - pte=%p *pte=%08x\n", ptep, opte); 4601 printf("prefetch_abort: pc=%08lx proc=%p " 4602 "process=%s\n", va, p, p->p_comm); 4603 printf("prefetch_abort: far=%08x fs=%x\n", 4604 cpu_faultaddress(), cpu_faultstatus()); 4605 } 4606 #ifdef DDB 4607 if (kernel_debug & 2) 4608 Debugger(); 4609 #endif 4610 rv = 1; 4611 } 4612 } 4613 #endif /* CPU_SA110 */ 4614 4615 #ifndef ARM_MMU_EXTENDED 4616 /* 4617 * If 'rv == 0' at this point, it generally indicates that there is a 4618 * stale TLB entry for the faulting address. That might be due to a 4619 * wrong setting of pmap_needs_pte_sync. So set it and retry. 4620 */ 4621 if (rv == 0 4622 && pm->pm_l1->l1_domain_use_count == 1 4623 && pmap_needs_pte_sync == 0) { 4624 pmap_needs_pte_sync = 1; 4625 PTE_SYNC(ptep); 4626 PMAPCOUNT(fixup_ptesync); 4627 rv = 1; 4628 } 4629 #endif 4630 4631 #ifndef MULTIPROCESSOR 4632 #if defined(DEBUG) || 1 4633 /* 4634 * If 'rv == 0' at this point, it generally indicates that there is a 4635 * stale TLB entry for the faulting address. This happens when two or 4636 * more processes are sharing an L1. Since we don't flush the TLB on 4637 * a context switch between such processes, we can take domain faults 4638 * for mappings which exist at the same VA in both processes. EVEN IF 4639 * WE'VE RECENTLY FIXED UP THE CORRESPONDING L1 in pmap_enter(), for 4640 * example. 4641 * 4642 * This is extremely likely to happen if pmap_enter() updated the L1 4643 * entry for a recently entered mapping. In this case, the TLB is 4644 * flushed for the new mapping, but there may still be TLB entries for 4645 * other mappings belonging to other processes in the 1MB range 4646 * covered by the L1 entry. 4647 * 4648 * Since 'rv == 0', we know that the L1 already contains the correct 4649 * value, so the fault must be due to a stale TLB entry. 4650 * 4651 * Since we always need to flush the TLB anyway in the case where we 4652 * fixed up the L1, or frobbed the L2 PTE, we effectively deal with 4653 * stale TLB entries dynamically. 4654 * 4655 * However, the above condition can ONLY happen if the current L1 is 4656 * being shared. If it happens when the L1 is unshared, it indicates 4657 * that other parts of the pmap are not doing their job WRT managing 4658 * the TLB. 4659 */ 4660 if (rv == 0 4661 #ifndef ARM_MMU_EXTENDED 4662 && pm->pm_l1->l1_domain_use_count == 1 4663 #endif 4664 && true) { 4665 #ifdef DEBUG 4666 extern int last_fault_code; 4667 #else 4668 int last_fault_code = ftype & VM_PROT_EXECUTE 4669 ? armreg_ifsr_read() 4670 : armreg_dfsr_read(); 4671 #endif 4672 printf("fixup: pm %p, va 0x%lx, ftype %d - nothing to do!\n", 4673 pm, va, ftype); 4674 printf("fixup: l2 %p, l2b %p, ptep %p, pte %#x\n", 4675 l2, l2b, ptep, opte); 4676 4677 #ifndef ARM_MMU_EXTENDED 4678 printf("fixup: pdep %p, pde %#x, fsr %#x\n", 4679 pdep, pde, last_fault_code); 4680 #else 4681 printf("fixup: pdep %p, pde %#x, ttbcr %#x\n", 4682 &pmap_l1_kva(pm)[l1slot], pmap_l1_kva(pm)[l1slot], 4683 armreg_ttbcr_read()); 4684 printf("fixup: fsr %#x cpm %p casid %#x contextidr %#x dacr %#x\n", 4685 last_fault_code, curcpu()->ci_pmap_cur, 4686 curcpu()->ci_pmap_asid_cur, 4687 armreg_contextidr_read(), armreg_dacr_read()); 4688 #ifdef _ARM_ARCH_7 4689 if (ftype & VM_PROT_WRITE) 4690 armreg_ats1cuw_write(va); 4691 else 4692 armreg_ats1cur_write(va); 4693 arm_isb(); 4694 printf("fixup: par %#x\n", armreg_par_read()); 4695 #endif 4696 #endif 4697 #ifdef DDB 4698 extern int kernel_debug; 4699 4700 if (kernel_debug & 2) { 4701 pmap_release_pmap_lock(pm); 4702 #ifdef UVMHIST 4703 KERNHIST_DUMP(maphist); 4704 #endif 4705 cpu_Debugger(); 4706 pmap_acquire_pmap_lock(pm); 4707 } 4708 #endif 4709 } 4710 #endif 4711 #endif 4712 4713 #ifndef ARM_MMU_EXTENDED 4714 /* Flush the TLB in the shared L1 case - see comment above */ 4715 pmap_tlb_flush_SE(pm, va, 4716 (ftype & VM_PROT_EXECUTE) ? PVF_EXEC | PVF_REF : PVF_REF); 4717 #endif 4718 4719 rv = 1; 4720 4721 out: 4722 pmap_release_pmap_lock(pm); 4723 4724 return (rv); 4725 } 4726 4727 /* 4728 * Routine: pmap_procwr 4729 * 4730 * Function: 4731 * Synchronize caches corresponding to [addr, addr+len) in p. 4732 * 4733 */ 4734 void 4735 pmap_procwr(struct proc *p, vaddr_t va, int len) 4736 { 4737 /* We only need to do anything if it is the current process. */ 4738 if (p == curproc) 4739 cpu_icache_sync_range(va, len); 4740 } 4741 4742 /* 4743 * Routine: pmap_unwire 4744 * Function: Clear the wired attribute for a map/virtual-address pair. 4745 * 4746 * In/out conditions: 4747 * The mapping must already exist in the pmap. 4748 */ 4749 void 4750 pmap_unwire(pmap_t pm, vaddr_t va) 4751 { 4752 struct l2_bucket *l2b; 4753 pt_entry_t *ptep, pte; 4754 struct vm_page *pg; 4755 paddr_t pa; 4756 4757 NPDEBUG(PDB_WIRING, printf("pmap_unwire: pm %p, va 0x%08lx\n", pm, va)); 4758 4759 pmap_acquire_pmap_lock(pm); 4760 4761 l2b = pmap_get_l2_bucket(pm, va); 4762 KDASSERT(l2b != NULL); 4763 4764 ptep = &l2b->l2b_kva[l2pte_index(va)]; 4765 pte = *ptep; 4766 4767 /* Extract the physical address of the page */ 4768 pa = l2pte_pa(pte); 4769 4770 if ((pg = PHYS_TO_VM_PAGE(pa)) != NULL) { 4771 /* Update the wired bit in the pv entry for this page. */ 4772 struct vm_page_md *md = VM_PAGE_TO_MD(pg); 4773 4774 pmap_acquire_page_lock(md); 4775 (void) pmap_modify_pv(md, pa, pm, va, PVF_WIRED, 0); 4776 pmap_release_page_lock(md); 4777 } 4778 4779 pmap_release_pmap_lock(pm); 4780 } 4781 4782 void 4783 pmap_activate(struct lwp *l) 4784 { 4785 struct cpu_info * const ci = curcpu(); 4786 extern int block_userspace_access; 4787 pmap_t npm = l->l_proc->p_vmspace->vm_map.pmap; 4788 #ifdef ARM_MMU_EXTENDED 4789 struct pmap_asid_info * const pai = PMAP_PAI(npm, cpu_tlb_info(ci)); 4790 #endif 4791 4792 UVMHIST_FUNC(__func__); UVMHIST_CALLED(maphist); 4793 4794 UVMHIST_LOG(maphist, "(l=%#x) pm=%#x", l, npm, 0, 0); 4795 4796 /* 4797 * If activating a non-current lwp or the current lwp is 4798 * already active, just return. 4799 */ 4800 if (false 4801 || l != curlwp 4802 #ifdef ARM_MMU_EXTENDED 4803 || (ci->ci_pmap_cur == npm && 4804 (npm == pmap_kernel() 4805 /* || PMAP_PAI_ASIDVALID_P(pai, cpu_tlb_info(ci)) */)) 4806 #else 4807 || npm->pm_activated == true 4808 #endif 4809 || false) { 4810 UVMHIST_LOG(maphist, " <-- (same pmap)", curlwp, l, 0, 0); 4811 return; 4812 } 4813 4814 #ifndef ARM_MMU_EXTENDED 4815 const uint32_t ndacr = (DOMAIN_CLIENT << (PMAP_DOMAIN_KERNEL * 2)) 4816 | (DOMAIN_CLIENT << (pmap_domain(npm) * 2)); 4817 4818 /* 4819 * If TTB and DACR are unchanged, short-circuit all the 4820 * TLB/cache management stuff. 4821 */ 4822 pmap_t opm = ci->ci_lastlwp 4823 ? ci->ci_lastlwp->l_proc->p_vmspace->vm_map.pmap 4824 : NULL; 4825 if (opm != NULL) { 4826 uint32_t odacr = (DOMAIN_CLIENT << (PMAP_DOMAIN_KERNEL * 2)) 4827 | (DOMAIN_CLIENT << (pmap_domain(opm) * 2)); 4828 4829 if (opm->pm_l1 == npm->pm_l1 && odacr == ndacr) 4830 goto all_done; 4831 } 4832 #endif /* !ARM_MMU_EXTENDED */ 4833 4834 PMAPCOUNT(activations); 4835 block_userspace_access = 1; 4836 4837 #ifndef ARM_MMU_EXTENDED 4838 /* 4839 * If switching to a user vmspace which is different to the 4840 * most recent one, and the most recent one is potentially 4841 * live in the cache, we must write-back and invalidate the 4842 * entire cache. 4843 */ 4844 pmap_t rpm = ci->ci_pmap_lastuser; 4845 #endif 4846 4847 /* 4848 * XXXSCW: There's a corner case here which can leave turds in the cache as 4849 * reported in kern/41058. They're probably left over during tear-down and 4850 * switching away from an exiting process. Until the root cause is identified 4851 * and fixed, zap the cache when switching pmaps. This will result in a few 4852 * unnecessary cache flushes, but that's better than silently corrupting data. 4853 */ 4854 #ifndef ARM_MMU_EXTENDED 4855 #if 0 4856 if (npm != pmap_kernel() && rpm && npm != rpm && 4857 rpm->pm_cstate.cs_cache) { 4858 rpm->pm_cstate.cs_cache = 0; 4859 #ifdef PMAP_CACHE_VIVT 4860 cpu_idcache_wbinv_all(); 4861 #endif 4862 } 4863 #else 4864 if (rpm) { 4865 rpm->pm_cstate.cs_cache = 0; 4866 if (npm == pmap_kernel()) 4867 ci->ci_pmap_lastuser = NULL; 4868 #ifdef PMAP_CACHE_VIVT 4869 cpu_idcache_wbinv_all(); 4870 #endif 4871 } 4872 #endif 4873 4874 /* No interrupts while we frob the TTB/DACR */ 4875 uint32_t oldirqstate = disable_interrupts(IF32_bits); 4876 #endif /* !ARM_MMU_EXTENDED */ 4877 4878 #ifndef ARM_HAS_VBAR 4879 /* 4880 * For ARM_VECTORS_LOW, we MUST, I repeat, MUST fix up the L1 4881 * entry corresponding to 'vector_page' in the incoming L1 table 4882 * before switching to it otherwise subsequent interrupts/exceptions 4883 * (including domain faults!) will jump into hyperspace. 4884 */ 4885 if (npm->pm_pl1vec != NULL) { 4886 cpu_tlb_flushID_SE((u_int)vector_page); 4887 cpu_cpwait(); 4888 *npm->pm_pl1vec = npm->pm_l1vec; 4889 PTE_SYNC(npm->pm_pl1vec); 4890 } 4891 #endif 4892 4893 #ifdef ARM_MMU_EXTENDED 4894 /* 4895 * Assume that TTBR1 has only global mappings and TTBR0 only has 4896 * non-global mappings. To prevent speculation from doing evil things 4897 * we disable translation table walks using TTBR0 before setting the 4898 * CONTEXTIDR (ASID) or new TTBR0 value. Once both are set, table 4899 * walks are reenabled. 4900 */ 4901 UVMHIST_LOG(maphist, " acquiring asid", 0, 0, 0, 0); 4902 const uint32_t old_ttbcr = armreg_ttbcr_read(); 4903 armreg_ttbcr_write(old_ttbcr | TTBCR_S_PD0); 4904 arm_isb(); 4905 pmap_tlb_asid_acquire(npm, l); 4906 UVMHIST_LOG(maphist, " setting ttbr pa=%#x asid=%#x", npm->pm_l1_pa, pai->pai_asid, 0, 0); 4907 cpu_setttb(npm->pm_l1_pa, pai->pai_asid); 4908 /* 4909 * Now we can reenable tablewalks since the CONTEXTIDR and TTRB0 have 4910 * been updated. 4911 */ 4912 arm_isb(); 4913 if (npm != pmap_kernel()) { 4914 armreg_ttbcr_write(old_ttbcr & ~TTBCR_S_PD0); 4915 } 4916 cpu_cpwait(); 4917 ci->ci_pmap_asid_cur = pai->pai_asid; 4918 #else 4919 cpu_domains(ndacr); 4920 if (npm == pmap_kernel() || npm == rpm) { 4921 /* 4922 * Switching to a kernel thread, or back to the 4923 * same user vmspace as before... Simply update 4924 * the TTB (no TLB flush required) 4925 */ 4926 cpu_setttb(npm->pm_l1->l1_physaddr, false); 4927 cpu_cpwait(); 4928 } else { 4929 /* 4930 * Otherwise, update TTB and flush TLB 4931 */ 4932 cpu_context_switch(npm->pm_l1->l1_physaddr); 4933 if (rpm != NULL) 4934 rpm->pm_cstate.cs_tlb = 0; 4935 } 4936 4937 restore_interrupts(oldirqstate); 4938 #endif /* ARM_MMU_EXTENDED */ 4939 4940 block_userspace_access = 0; 4941 4942 #ifndef ARM_MMU_EXTENDED 4943 all_done: 4944 /* 4945 * The new pmap is resident. Make sure it's marked 4946 * as resident in the cache/TLB. 4947 */ 4948 npm->pm_cstate.cs_all = PMAP_CACHE_STATE_ALL; 4949 if (npm != pmap_kernel()) 4950 ci->ci_pmap_lastuser = npm; 4951 4952 /* The old pmap is not longer active */ 4953 if (opm != npm) { 4954 if (opm != NULL) 4955 opm->pm_activated = false; 4956 4957 /* But the new one is */ 4958 npm->pm_activated = true; 4959 } 4960 #endif 4961 ci->ci_pmap_cur = npm; 4962 UVMHIST_LOG(maphist, " <-- done", 0, 0, 0, 0); 4963 } 4964 4965 void 4966 pmap_deactivate(struct lwp *l) 4967 { 4968 pmap_t pm = l->l_proc->p_vmspace->vm_map.pmap; 4969 4970 UVMHIST_FUNC(__func__); UVMHIST_CALLED(maphist); 4971 4972 UVMHIST_LOG(maphist, "(l=%#x) pm=%#x", l, pm, 0, 0); 4973 4974 #ifdef ARM_MMU_EXTENDED 4975 kpreempt_disable(); 4976 struct cpu_info * const ci = curcpu(); 4977 /* 4978 * Disable translation table walks from TTBR0 while no pmap has been 4979 * activated. 4980 */ 4981 const uint32_t old_ttbcr = armreg_ttbcr_read(); 4982 armreg_ttbcr_write(old_ttbcr | TTBCR_S_PD0); 4983 arm_isb(); 4984 pmap_tlb_asid_deactivate(pm); 4985 cpu_setttb(pmap_kernel()->pm_l1_pa, KERNEL_PID); 4986 ci->ci_pmap_cur = pmap_kernel(); 4987 ci->ci_pmap_asid_cur = KERNEL_PID; 4988 kpreempt_enable(); 4989 #else 4990 /* 4991 * If the process is exiting, make sure pmap_activate() does 4992 * a full MMU context-switch and cache flush, which we might 4993 * otherwise skip. See PR port-arm/38950. 4994 */ 4995 if (l->l_proc->p_sflag & PS_WEXIT) 4996 curcpu()->ci_lastlwp = NULL; 4997 4998 pm->pm_activated = false; 4999 #endif 5000 UVMHIST_LOG(maphist, " <-- done", 0, 0, 0, 0); 5001 } 5002 5003 void 5004 pmap_update(pmap_t pm) 5005 { 5006 5007 if (pm->pm_remove_all) { 5008 #ifdef ARM_MMU_EXTENDED 5009 KASSERT(pm != pmap_kernel()); 5010 5011 KASSERTMSG(curcpu()->ci_pmap_cur != pm 5012 || pm->pm_pai[0].pai_asid == curcpu()->ci_pmap_asid_cur, 5013 "pmap/asid %p/%#x != %s cur pmap/asid %p/%#x", pm, 5014 pm->pm_pai[0].pai_asid, curcpu()->ci_data.cpu_name, 5015 curcpu()->ci_pmap_cur, curcpu()->ci_pmap_asid_cur); 5016 /* 5017 * Finish up the pmap_remove_all() optimisation by flushing 5018 * all our ASIDs. 5019 */ 5020 pmap_tlb_asid_release_all(pm); 5021 #else 5022 /* 5023 * Finish up the pmap_remove_all() optimisation by flushing 5024 * the TLB. 5025 */ 5026 pmap_tlb_flushID(pm); 5027 #endif 5028 pm->pm_remove_all = false; 5029 } 5030 5031 #ifdef ARM_MMU_EXTENDED 5032 #if defined(MULTIPROCESSOR) 5033 armreg_bpiallis_write(0); 5034 #else 5035 armreg_bpiall_write(0); 5036 #endif 5037 5038 #if defined(MULTIPROCESSOR) && PMAP_TLB_MAX > 1 5039 u_int pending = atomic_swap_uint(&pmap->pm_shootdown_pending, 0); 5040 if (pending && pmap_tlb_shootdown_bystanders(pmap)) { 5041 PMAP_COUNT(shootdown_ipis); 5042 } 5043 #endif 5044 KASSERTMSG(pm == pmap_kernel() 5045 || curcpu()->ci_pmap_cur != pm 5046 || pm->pm_pai[0].pai_asid == curcpu()->ci_pmap_asid_cur, 5047 "pmap/asid %p/%#x != %s cur pmap/asid %p/%#x", pm, 5048 pm->pm_pai[0].pai_asid, curcpu()->ci_data.cpu_name, 5049 curcpu()->ci_pmap_cur, curcpu()->ci_pmap_asid_cur); 5050 #else 5051 if (pmap_is_current(pm)) { 5052 /* 5053 * If we're dealing with a current userland pmap, move its L1 5054 * to the end of the LRU. 5055 */ 5056 if (pm != pmap_kernel()) 5057 pmap_use_l1(pm); 5058 5059 /* 5060 * We can assume we're done with frobbing the cache/tlb for 5061 * now. Make sure any future pmap ops don't skip cache/tlb 5062 * flushes. 5063 */ 5064 pm->pm_cstate.cs_all = PMAP_CACHE_STATE_ALL; 5065 } 5066 #endif 5067 5068 PMAPCOUNT(updates); 5069 5070 /* 5071 * make sure TLB/cache operations have completed. 5072 */ 5073 cpu_cpwait(); 5074 } 5075 5076 void 5077 pmap_remove_all(pmap_t pm) 5078 { 5079 5080 /* 5081 * The vmspace described by this pmap is about to be torn down. 5082 * Until pmap_update() is called, UVM will only make calls 5083 * to pmap_remove(). We can make life much simpler by flushing 5084 * the cache now, and deferring TLB invalidation to pmap_update(). 5085 */ 5086 #ifdef PMAP_CACHE_VIVT 5087 pmap_cache_wbinv_all(pm, PVF_EXEC); 5088 #endif 5089 pm->pm_remove_all = true; 5090 } 5091 5092 /* 5093 * Retire the given physical map from service. 5094 * Should only be called if the map contains no valid mappings. 5095 */ 5096 void 5097 pmap_destroy(pmap_t pm) 5098 { 5099 u_int count; 5100 5101 if (pm == NULL) 5102 return; 5103 5104 if (pm->pm_remove_all) { 5105 pmap_tlb_flushID(pm); 5106 pm->pm_remove_all = false; 5107 } 5108 5109 /* 5110 * Drop reference count 5111 */ 5112 mutex_enter(pm->pm_lock); 5113 count = --pm->pm_obj.uo_refs; 5114 mutex_exit(pm->pm_lock); 5115 if (count > 0) { 5116 #ifndef ARM_MMU_EXTENDED 5117 if (pmap_is_current(pm)) { 5118 if (pm != pmap_kernel()) 5119 pmap_use_l1(pm); 5120 pm->pm_cstate.cs_all = PMAP_CACHE_STATE_ALL; 5121 } 5122 #endif 5123 return; 5124 } 5125 5126 /* 5127 * reference count is zero, free pmap resources and then free pmap. 5128 */ 5129 5130 #ifndef ARM_HAS_VBAR 5131 if (vector_page < KERNEL_BASE) { 5132 KDASSERT(!pmap_is_current(pm)); 5133 5134 /* Remove the vector page mapping */ 5135 pmap_remove(pm, vector_page, vector_page + PAGE_SIZE); 5136 pmap_update(pm); 5137 } 5138 #endif 5139 5140 pmap_free_l1(pm); 5141 5142 #ifdef ARM_MMU_EXTENDED 5143 #ifdef MULTIPROCESSOR 5144 kcpuset_destroy(pm->pm_active); 5145 kcpuset_destroy(pm->pm_onproc); 5146 #endif 5147 #else 5148 struct cpu_info * const ci = curcpu(); 5149 if (ci->ci_pmap_lastuser == pm) 5150 ci->ci_pmap_lastuser = NULL; 5151 #endif 5152 5153 uvm_obj_destroy(&pm->pm_obj, false); 5154 mutex_destroy(&pm->pm_obj_lock); 5155 pool_cache_put(&pmap_cache, pm); 5156 } 5157 5158 5159 /* 5160 * void pmap_reference(pmap_t pm) 5161 * 5162 * Add a reference to the specified pmap. 5163 */ 5164 void 5165 pmap_reference(pmap_t pm) 5166 { 5167 5168 if (pm == NULL) 5169 return; 5170 5171 #ifndef ARM_MMU_EXTENDED 5172 pmap_use_l1(pm); 5173 #endif 5174 5175 mutex_enter(pm->pm_lock); 5176 pm->pm_obj.uo_refs++; 5177 mutex_exit(pm->pm_lock); 5178 } 5179 5180 #if (ARM_MMU_V6 + ARM_MMU_V7) > 0 5181 5182 static struct evcnt pmap_prefer_nochange_ev = 5183 EVCNT_INITIALIZER(EVCNT_TYPE_MISC, NULL, "pmap prefer", "nochange"); 5184 static struct evcnt pmap_prefer_change_ev = 5185 EVCNT_INITIALIZER(EVCNT_TYPE_MISC, NULL, "pmap prefer", "change"); 5186 5187 EVCNT_ATTACH_STATIC(pmap_prefer_change_ev); 5188 EVCNT_ATTACH_STATIC(pmap_prefer_nochange_ev); 5189 5190 void 5191 pmap_prefer(vaddr_t hint, vaddr_t *vap, int td) 5192 { 5193 vsize_t mask = arm_cache_prefer_mask | (PAGE_SIZE - 1); 5194 vaddr_t va = *vap; 5195 vaddr_t diff = (hint - va) & mask; 5196 if (diff == 0) { 5197 pmap_prefer_nochange_ev.ev_count++; 5198 } else { 5199 pmap_prefer_change_ev.ev_count++; 5200 if (__predict_false(td)) 5201 va -= mask + 1; 5202 *vap = va + diff; 5203 } 5204 } 5205 #endif /* ARM_MMU_V6 | ARM_MMU_V7 */ 5206 5207 /* 5208 * pmap_zero_page() 5209 * 5210 * Zero a given physical page by mapping it at a page hook point. 5211 * In doing the zero page op, the page we zero is mapped cachable, as with 5212 * StrongARM accesses to non-cached pages are non-burst making writing 5213 * _any_ bulk data very slow. 5214 */ 5215 #if (ARM_MMU_GENERIC + ARM_MMU_SA1 + ARM_MMU_V6 + ARM_MMU_V7) != 0 5216 void 5217 pmap_zero_page_generic(paddr_t pa) 5218 { 5219 #if defined(PMAP_CACHE_VIPT) || defined(DEBUG) 5220 struct vm_page *pg = PHYS_TO_VM_PAGE(pa); 5221 struct vm_page_md *md = VM_PAGE_TO_MD(pg); 5222 #endif 5223 #if defined(PMAP_CACHE_VIPT) 5224 /* Choose the last page color it had, if any */ 5225 const vsize_t va_offset = md->pvh_attrs & arm_cache_prefer_mask; 5226 #else 5227 const vsize_t va_offset = 0; 5228 #endif 5229 #if defined(__HAVE_MM_MD_DIRECT_MAPPED_PHYS) 5230 /* 5231 * Is this page mapped at its natural color? 5232 * If we have all of memory mapped, then just convert PA to VA. 5233 */ 5234 bool okcolor = arm_pcache.dcache_type == CACHE_TYPE_PIPT 5235 || va_offset == (pa & arm_cache_prefer_mask); 5236 const vaddr_t vdstp = okcolor 5237 ? pmap_direct_mapped_phys(pa, &okcolor, cpu_cdstp(va_offset)) 5238 : cpu_cdstp(va_offset); 5239 #else 5240 const bool okcolor = false; 5241 const vaddr_t vdstp = cpu_cdstp(va_offset); 5242 #endif 5243 pt_entry_t * const ptep = cpu_cdst_pte(va_offset); 5244 5245 5246 #ifdef DEBUG 5247 if (!SLIST_EMPTY(&md->pvh_list)) 5248 panic("pmap_zero_page: page has mappings"); 5249 #endif 5250 5251 KDASSERT((pa & PGOFSET) == 0); 5252 5253 if (!okcolor) { 5254 /* 5255 * Hook in the page, zero it, and purge the cache for that 5256 * zeroed page. Invalidate the TLB as needed. 5257 */ 5258 const pt_entry_t npte = L2_S_PROTO | pa | pte_l2_s_cache_mode 5259 | L2_S_PROT(PTE_KERNEL, VM_PROT_WRITE); 5260 l2pte_set(ptep, npte, 0); 5261 PTE_SYNC(ptep); 5262 cpu_tlb_flushD_SE(vdstp); 5263 cpu_cpwait(); 5264 #if defined(__HAVE_MM_MD_DIRECT_MAPPED_PHYS) && defined(PMAP_CACHE_VIPT) \ 5265 && !defined(ARM_MMU_EXTENDED) 5266 /* 5267 * If we are direct-mapped and our color isn't ok, then before 5268 * we bzero the page invalidate its contents from the cache and 5269 * reset the color to its natural color. 5270 */ 5271 cpu_dcache_inv_range(vdstp, PAGE_SIZE); 5272 md->pvh_attrs &= ~arm_cache_prefer_mask; 5273 md->pvh_attrs |= (pa & arm_cache_prefer_mask); 5274 #endif 5275 } 5276 bzero_page(vdstp); 5277 if (!okcolor) { 5278 /* 5279 * Unmap the page. 5280 */ 5281 l2pte_reset(ptep); 5282 PTE_SYNC(ptep); 5283 cpu_tlb_flushD_SE(vdstp); 5284 #ifdef PMAP_CACHE_VIVT 5285 cpu_dcache_wbinv_range(vdstp, PAGE_SIZE); 5286 #endif 5287 } 5288 #ifdef PMAP_CACHE_VIPT 5289 /* 5290 * This page is now cache resident so it now has a page color. 5291 * Any contents have been obliterated so clear the EXEC flag. 5292 */ 5293 #ifndef ARM_MMU_EXTENDED 5294 if (!pmap_is_page_colored_p(md)) { 5295 PMAPCOUNT(vac_color_new); 5296 md->pvh_attrs |= PVF_COLORED; 5297 } 5298 md->pvh_attrs |= PVF_DIRTY; 5299 #endif 5300 if (PV_IS_EXEC_P(md->pvh_attrs)) { 5301 md->pvh_attrs &= ~PVF_EXEC; 5302 PMAPCOUNT(exec_discarded_zero); 5303 } 5304 #endif 5305 } 5306 #endif /* (ARM_MMU_GENERIC + ARM_MMU_SA1 + ARM_MMU_V6) != 0 */ 5307 5308 #if ARM_MMU_XSCALE == 1 5309 void 5310 pmap_zero_page_xscale(paddr_t pa) 5311 { 5312 #ifdef DEBUG 5313 struct vm_page *pg = PHYS_TO_VM_PAGE(pa); 5314 struct vm_page_md *md = VM_PAGE_TO_MD(pg); 5315 5316 if (!SLIST_EMPTY(&md->pvh_list)) 5317 panic("pmap_zero_page: page has mappings"); 5318 #endif 5319 5320 KDASSERT((pa & PGOFSET) == 0); 5321 5322 /* 5323 * Hook in the page, zero it, and purge the cache for that 5324 * zeroed page. Invalidate the TLB as needed. 5325 */ 5326 5327 pt_entry_t npte = L2_S_PROTO | pa | 5328 L2_S_PROT(PTE_KERNEL, VM_PROT_WRITE) | 5329 L2_C | L2_XS_T_TEX(TEX_XSCALE_X); /* mini-data */ 5330 l2pte_set(cdst_pte, npte, 0); 5331 PTE_SYNC(cdst_pte); 5332 cpu_tlb_flushD_SE(cdstp); 5333 cpu_cpwait(); 5334 bzero_page(cdstp); 5335 xscale_cache_clean_minidata(); 5336 l2pte_reset(cdst_pte); 5337 PTE_SYNC(cdst_pte); 5338 } 5339 #endif /* ARM_MMU_XSCALE == 1 */ 5340 5341 /* pmap_pageidlezero() 5342 * 5343 * The same as above, except that we assume that the page is not 5344 * mapped. This means we never have to flush the cache first. Called 5345 * from the idle loop. 5346 */ 5347 bool 5348 pmap_pageidlezero(paddr_t pa) 5349 { 5350 bool rv = true; 5351 #if defined(PMAP_CACHE_VIPT) || defined(DEBUG) 5352 struct vm_page * const pg = PHYS_TO_VM_PAGE(pa); 5353 struct vm_page_md *md = VM_PAGE_TO_MD(pg); 5354 #endif 5355 #ifdef PMAP_CACHE_VIPT 5356 /* Choose the last page color it had, if any */ 5357 const vsize_t va_offset = md->pvh_attrs & arm_cache_prefer_mask; 5358 #else 5359 const vsize_t va_offset = 0; 5360 #endif 5361 #ifdef __HAVE_MM_MD_DIRECT_MAPPED_PHYS 5362 bool okcolor = arm_pcache.dcache_type == CACHE_TYPE_PIPT 5363 || va_offset == (pa & arm_cache_prefer_mask); 5364 const vaddr_t vdstp = okcolor 5365 ? pmap_direct_mapped_phys(pa, &okcolor, cpu_cdstp(va_offset)) 5366 : cpu_cdstp(va_offset); 5367 #else 5368 const bool okcolor = false; 5369 const vaddr_t vdstp = cpu_cdstp(va_offset); 5370 #endif 5371 pt_entry_t * const ptep = cpu_cdst_pte(va_offset); 5372 5373 5374 #ifdef DEBUG 5375 if (!SLIST_EMPTY(&md->pvh_list)) 5376 panic("pmap_pageidlezero: page has mappings"); 5377 #endif 5378 5379 KDASSERT((pa & PGOFSET) == 0); 5380 5381 if (!okcolor) { 5382 /* 5383 * Hook in the page, zero it, and purge the cache for that 5384 * zeroed page. Invalidate the TLB as needed. 5385 */ 5386 const pt_entry_t npte = L2_S_PROTO | pa | 5387 L2_S_PROT(PTE_KERNEL, VM_PROT_WRITE) | pte_l2_s_cache_mode; 5388 l2pte_set(ptep, npte, 0); 5389 PTE_SYNC(ptep); 5390 cpu_tlb_flushD_SE(vdstp); 5391 cpu_cpwait(); 5392 } 5393 5394 uint64_t *ptr = (uint64_t *)vdstp; 5395 for (size_t i = 0; i < PAGE_SIZE / sizeof(*ptr); i++) { 5396 if (sched_curcpu_runnable_p() != 0) { 5397 /* 5398 * A process has become ready. Abort now, 5399 * so we don't keep it waiting while we 5400 * do slow memory access to finish this 5401 * page. 5402 */ 5403 rv = false; 5404 break; 5405 } 5406 *ptr++ = 0; 5407 } 5408 5409 #ifdef PMAP_CACHE_VIVT 5410 if (rv) 5411 /* 5412 * if we aborted we'll rezero this page again later so don't 5413 * purge it unless we finished it 5414 */ 5415 cpu_dcache_wbinv_range(vdstp, PAGE_SIZE); 5416 #elif defined(PMAP_CACHE_VIPT) 5417 /* 5418 * This page is now cache resident so it now has a page color. 5419 * Any contents have been obliterated so clear the EXEC flag. 5420 */ 5421 #ifndef ARM_MMU_EXTENDED 5422 if (!pmap_is_page_colored_p(md)) { 5423 PMAPCOUNT(vac_color_new); 5424 md->pvh_attrs |= PVF_COLORED; 5425 } 5426 #endif 5427 if (PV_IS_EXEC_P(md->pvh_attrs)) { 5428 md->pvh_attrs &= ~PVF_EXEC; 5429 PMAPCOUNT(exec_discarded_zero); 5430 } 5431 #endif 5432 /* 5433 * Unmap the page. 5434 */ 5435 if (!okcolor) { 5436 l2pte_reset(ptep); 5437 PTE_SYNC(ptep); 5438 cpu_tlb_flushD_SE(vdstp); 5439 } 5440 5441 return rv; 5442 } 5443 5444 /* 5445 * pmap_copy_page() 5446 * 5447 * Copy one physical page into another, by mapping the pages into 5448 * hook points. The same comment regarding cachability as in 5449 * pmap_zero_page also applies here. 5450 */ 5451 #if (ARM_MMU_GENERIC + ARM_MMU_SA1 + ARM_MMU_V6 + ARM_MMU_V7) != 0 5452 void 5453 pmap_copy_page_generic(paddr_t src, paddr_t dst) 5454 { 5455 struct vm_page * const src_pg = PHYS_TO_VM_PAGE(src); 5456 struct vm_page_md *src_md = VM_PAGE_TO_MD(src_pg); 5457 #if defined(PMAP_CACHE_VIPT) || defined(DEBUG) 5458 struct vm_page * const dst_pg = PHYS_TO_VM_PAGE(dst); 5459 struct vm_page_md *dst_md = VM_PAGE_TO_MD(dst_pg); 5460 #endif 5461 #ifdef PMAP_CACHE_VIPT 5462 const vsize_t src_va_offset = src_md->pvh_attrs & arm_cache_prefer_mask; 5463 const vsize_t dst_va_offset = dst_md->pvh_attrs & arm_cache_prefer_mask; 5464 #else 5465 const vsize_t src_va_offset = 0; 5466 const vsize_t dst_va_offset = 0; 5467 #endif 5468 #if defined(__HAVE_MM_MD_DIRECT_MAPPED_PHYS) 5469 /* 5470 * Is this page mapped at its natural color? 5471 * If we have all of memory mapped, then just convert PA to VA. 5472 */ 5473 bool src_okcolor = arm_pcache.dcache_type == CACHE_TYPE_PIPT 5474 || src_va_offset == (src & arm_cache_prefer_mask); 5475 bool dst_okcolor = arm_pcache.dcache_type == CACHE_TYPE_PIPT 5476 || dst_va_offset == (dst & arm_cache_prefer_mask); 5477 const vaddr_t vsrcp = src_okcolor 5478 ? pmap_direct_mapped_phys(src, &src_okcolor, 5479 cpu_csrcp(src_va_offset)) 5480 : cpu_csrcp(src_va_offset); 5481 const vaddr_t vdstp = pmap_direct_mapped_phys(dst, &dst_okcolor, 5482 cpu_cdstp(dst_va_offset)); 5483 #else 5484 const bool src_okcolor = false; 5485 const bool dst_okcolor = false; 5486 const vaddr_t vsrcp = cpu_csrcp(src_va_offset); 5487 const vaddr_t vdstp = cpu_cdstp(dst_va_offset); 5488 #endif 5489 pt_entry_t * const src_ptep = cpu_csrc_pte(src_va_offset); 5490 pt_entry_t * const dst_ptep = cpu_cdst_pte(dst_va_offset); 5491 5492 #ifdef DEBUG 5493 if (!SLIST_EMPTY(&dst_md->pvh_list)) 5494 panic("pmap_copy_page: dst page has mappings"); 5495 #endif 5496 5497 #if defined(PMAP_CACHE_VIPT) && !defined(ARM_MMU_EXTENDED) 5498 KASSERT(arm_cache_prefer_mask == 0 || src_md->pvh_attrs & (PVF_COLORED|PVF_NC)); 5499 #endif 5500 KDASSERT((src & PGOFSET) == 0); 5501 KDASSERT((dst & PGOFSET) == 0); 5502 5503 /* 5504 * Clean the source page. Hold the source page's lock for 5505 * the duration of the copy so that no other mappings can 5506 * be created while we have a potentially aliased mapping. 5507 */ 5508 #ifdef PMAP_CACHE_VIVT 5509 pmap_acquire_page_lock(src_md); 5510 (void) pmap_clean_page(src_md, true); 5511 pmap_release_page_lock(src_md); 5512 #endif 5513 5514 /* 5515 * Map the pages into the page hook points, copy them, and purge 5516 * the cache for the appropriate page. Invalidate the TLB 5517 * as required. 5518 */ 5519 if (!src_okcolor) { 5520 const pt_entry_t nsrc_pte = L2_S_PROTO 5521 | src 5522 #if defined(PMAP_CACHE_VIPT) && !defined(ARM_MMU_EXTENDED) 5523 | ((src_md->pvh_attrs & PVF_NC) ? 0 : pte_l2_s_cache_mode) 5524 #else // defined(PMAP_CACHE_VIVT) || defined(ARM_MMU_EXTENDED) 5525 | pte_l2_s_cache_mode 5526 #endif 5527 | L2_S_PROT(PTE_KERNEL, VM_PROT_READ); 5528 l2pte_set(src_ptep, nsrc_pte, 0); 5529 PTE_SYNC(src_ptep); 5530 cpu_tlb_flushD_SE(vsrcp); 5531 cpu_cpwait(); 5532 } 5533 if (!dst_okcolor) { 5534 const pt_entry_t ndst_pte = L2_S_PROTO | dst | 5535 L2_S_PROT(PTE_KERNEL, VM_PROT_WRITE) | pte_l2_s_cache_mode; 5536 l2pte_set(dst_ptep, ndst_pte, 0); 5537 PTE_SYNC(dst_ptep); 5538 cpu_tlb_flushD_SE(vdstp); 5539 cpu_cpwait(); 5540 #if defined(__HAVE_MM_MD_DIRECT_MAPPED_PHYS) && defined(PMAP_CACHE_VIPT) 5541 /* 5542 * If we are direct-mapped and our color isn't ok, then before 5543 * we bcopy to the new page invalidate its contents from the 5544 * cache and reset its color to its natural color. 5545 */ 5546 cpu_dcache_inv_range(vdstp, PAGE_SIZE); 5547 dst_md->pvh_attrs &= ~arm_cache_prefer_mask; 5548 dst_md->pvh_attrs |= (dst & arm_cache_prefer_mask); 5549 #endif 5550 } 5551 bcopy_page(vsrcp, vdstp); 5552 #ifdef PMAP_CACHE_VIVT 5553 cpu_dcache_inv_range(vsrcp, PAGE_SIZE); 5554 cpu_dcache_wbinv_range(vdstp, PAGE_SIZE); 5555 #endif 5556 /* 5557 * Unmap the pages. 5558 */ 5559 if (!src_okcolor) { 5560 l2pte_reset(src_ptep); 5561 PTE_SYNC(src_ptep); 5562 cpu_tlb_flushD_SE(vsrcp); 5563 cpu_cpwait(); 5564 } 5565 if (!dst_okcolor) { 5566 l2pte_reset(dst_ptep); 5567 PTE_SYNC(dst_ptep); 5568 cpu_tlb_flushD_SE(vdstp); 5569 cpu_cpwait(); 5570 } 5571 #ifdef PMAP_CACHE_VIPT 5572 /* 5573 * Now that the destination page is in the cache, mark it as colored. 5574 * If this was an exec page, discard it. 5575 */ 5576 pmap_acquire_page_lock(dst_md); 5577 #ifndef ARM_MMU_EXTENDED 5578 if (arm_pcache.cache_type == CACHE_TYPE_PIPT) { 5579 dst_md->pvh_attrs &= ~arm_cache_prefer_mask; 5580 dst_md->pvh_attrs |= (dst & arm_cache_prefer_mask); 5581 } 5582 if (!pmap_is_page_colored_p(dst_md)) { 5583 PMAPCOUNT(vac_color_new); 5584 dst_md->pvh_attrs |= PVF_COLORED; 5585 } 5586 dst_md->pvh_attrs |= PVF_DIRTY; 5587 #endif 5588 if (PV_IS_EXEC_P(dst_md->pvh_attrs)) { 5589 dst_md->pvh_attrs &= ~PVF_EXEC; 5590 PMAPCOUNT(exec_discarded_copy); 5591 } 5592 pmap_release_page_lock(dst_md); 5593 #endif 5594 } 5595 #endif /* (ARM_MMU_GENERIC + ARM_MMU_SA1 + ARM_MMU_V6) != 0 */ 5596 5597 #if ARM_MMU_XSCALE == 1 5598 void 5599 pmap_copy_page_xscale(paddr_t src, paddr_t dst) 5600 { 5601 struct vm_page *src_pg = PHYS_TO_VM_PAGE(src); 5602 struct vm_page_md *src_md = VM_PAGE_TO_MD(src_pg); 5603 #ifdef DEBUG 5604 struct vm_page_md *dst_md = VM_PAGE_TO_MD(PHYS_TO_VM_PAGE(dst)); 5605 5606 if (!SLIST_EMPTY(&dst_md->pvh_list)) 5607 panic("pmap_copy_page: dst page has mappings"); 5608 #endif 5609 5610 KDASSERT((src & PGOFSET) == 0); 5611 KDASSERT((dst & PGOFSET) == 0); 5612 5613 /* 5614 * Clean the source page. Hold the source page's lock for 5615 * the duration of the copy so that no other mappings can 5616 * be created while we have a potentially aliased mapping. 5617 */ 5618 #ifdef PMAP_CACHE_VIVT 5619 pmap_acquire_page_lock(src_md); 5620 (void) pmap_clean_page(src_md, true); 5621 pmap_release_page_lock(src_md); 5622 #endif 5623 5624 /* 5625 * Map the pages into the page hook points, copy them, and purge 5626 * the cache for the appropriate page. Invalidate the TLB 5627 * as required. 5628 */ 5629 const pt_entry_t nsrc_pte = L2_S_PROTO | src 5630 | L2_S_PROT(PTE_KERNEL, VM_PROT_READ) 5631 | L2_C | L2_XS_T_TEX(TEX_XSCALE_X); /* mini-data */ 5632 l2pte_set(csrc_pte, nsrc_pte, 0); 5633 PTE_SYNC(csrc_pte); 5634 5635 const pt_entry_t ndst_pte = L2_S_PROTO | dst 5636 | L2_S_PROT(PTE_KERNEL, VM_PROT_WRITE) 5637 | L2_C | L2_XS_T_TEX(TEX_XSCALE_X); /* mini-data */ 5638 l2pte_set(cdst_pte, ndst_pte, 0); 5639 PTE_SYNC(cdst_pte); 5640 5641 cpu_tlb_flushD_SE(csrcp); 5642 cpu_tlb_flushD_SE(cdstp); 5643 cpu_cpwait(); 5644 bcopy_page(csrcp, cdstp); 5645 xscale_cache_clean_minidata(); 5646 l2pte_reset(csrc_pte); 5647 l2pte_reset(cdst_pte); 5648 PTE_SYNC(csrc_pte); 5649 PTE_SYNC(cdst_pte); 5650 } 5651 #endif /* ARM_MMU_XSCALE == 1 */ 5652 5653 /* 5654 * void pmap_virtual_space(vaddr_t *start, vaddr_t *end) 5655 * 5656 * Return the start and end addresses of the kernel's virtual space. 5657 * These values are setup in pmap_bootstrap and are updated as pages 5658 * are allocated. 5659 */ 5660 void 5661 pmap_virtual_space(vaddr_t *start, vaddr_t *end) 5662 { 5663 *start = virtual_avail; 5664 *end = virtual_end; 5665 } 5666 5667 /* 5668 * Helper function for pmap_grow_l2_bucket() 5669 */ 5670 static inline int 5671 pmap_grow_map(vaddr_t va, paddr_t *pap) 5672 { 5673 paddr_t pa; 5674 5675 if (uvm.page_init_done == false) { 5676 #ifdef PMAP_STEAL_MEMORY 5677 pv_addr_t pv; 5678 pmap_boot_pagealloc(PAGE_SIZE, 5679 #ifdef PMAP_CACHE_VIPT 5680 arm_cache_prefer_mask, 5681 va & arm_cache_prefer_mask, 5682 #else 5683 0, 0, 5684 #endif 5685 &pv); 5686 pa = pv.pv_pa; 5687 #else 5688 if (uvm_page_physget(&pa) == false) 5689 return (1); 5690 #endif /* PMAP_STEAL_MEMORY */ 5691 } else { 5692 struct vm_page *pg; 5693 pg = uvm_pagealloc(NULL, 0, NULL, UVM_PGA_USERESERVE); 5694 if (pg == NULL) 5695 return (1); 5696 pa = VM_PAGE_TO_PHYS(pg); 5697 /* 5698 * This new page must not have any mappings. Enter it via 5699 * pmap_kenter_pa and let that routine do the hard work. 5700 */ 5701 struct vm_page_md *md __diagused = VM_PAGE_TO_MD(pg); 5702 KASSERT(SLIST_EMPTY(&md->pvh_list)); 5703 pmap_kenter_pa(va, pa, 5704 VM_PROT_READ|VM_PROT_WRITE, PMAP_KMPAGE|PMAP_PTE); 5705 } 5706 5707 if (pap) 5708 *pap = pa; 5709 5710 PMAPCOUNT(pt_mappings); 5711 #ifdef DEBUG 5712 struct l2_bucket * const l2b = pmap_get_l2_bucket(pmap_kernel(), va); 5713 KDASSERT(l2b != NULL); 5714 5715 pt_entry_t * const ptep = &l2b->l2b_kva[l2pte_index(va)]; 5716 const pt_entry_t opte = *ptep; 5717 KDASSERT((opte & L2_S_CACHE_MASK) == pte_l2_s_cache_mode_pt); 5718 #endif 5719 memset((void *)va, 0, PAGE_SIZE); 5720 return (0); 5721 } 5722 5723 /* 5724 * This is the same as pmap_alloc_l2_bucket(), except that it is only 5725 * used by pmap_growkernel(). 5726 */ 5727 static inline struct l2_bucket * 5728 pmap_grow_l2_bucket(pmap_t pm, vaddr_t va) 5729 { 5730 struct l2_dtable *l2; 5731 struct l2_bucket *l2b; 5732 u_short l1slot; 5733 vaddr_t nva; 5734 5735 l1slot = l1pte_index(va); 5736 5737 if ((l2 = pm->pm_l2[L2_IDX(l1slot)]) == NULL) { 5738 /* 5739 * No mapping at this address, as there is 5740 * no entry in the L1 table. 5741 * Need to allocate a new l2_dtable. 5742 */ 5743 nva = pmap_kernel_l2dtable_kva; 5744 if ((nva & PGOFSET) == 0) { 5745 /* 5746 * Need to allocate a backing page 5747 */ 5748 if (pmap_grow_map(nva, NULL)) 5749 return (NULL); 5750 } 5751 5752 l2 = (struct l2_dtable *)nva; 5753 nva += sizeof(struct l2_dtable); 5754 5755 if ((nva & PGOFSET) < (pmap_kernel_l2dtable_kva & PGOFSET)) { 5756 /* 5757 * The new l2_dtable straddles a page boundary. 5758 * Map in another page to cover it. 5759 */ 5760 if (pmap_grow_map(nva, NULL)) 5761 return (NULL); 5762 } 5763 5764 pmap_kernel_l2dtable_kva = nva; 5765 5766 /* 5767 * Link it into the parent pmap 5768 */ 5769 pm->pm_l2[L2_IDX(l1slot)] = l2; 5770 } 5771 5772 l2b = &l2->l2_bucket[L2_BUCKET(l1slot)]; 5773 5774 /* 5775 * Fetch pointer to the L2 page table associated with the address. 5776 */ 5777 if (l2b->l2b_kva == NULL) { 5778 pt_entry_t *ptep; 5779 5780 /* 5781 * No L2 page table has been allocated. Chances are, this 5782 * is because we just allocated the l2_dtable, above. 5783 */ 5784 nva = pmap_kernel_l2ptp_kva; 5785 ptep = (pt_entry_t *)nva; 5786 if ((nva & PGOFSET) == 0) { 5787 /* 5788 * Need to allocate a backing page 5789 */ 5790 if (pmap_grow_map(nva, &pmap_kernel_l2ptp_phys)) 5791 return (NULL); 5792 PTE_SYNC_RANGE(ptep, PAGE_SIZE / sizeof(pt_entry_t)); 5793 } 5794 5795 l2->l2_occupancy++; 5796 l2b->l2b_kva = ptep; 5797 l2b->l2b_l1slot = l1slot; 5798 l2b->l2b_pa = pmap_kernel_l2ptp_phys; 5799 5800 pmap_kernel_l2ptp_kva += L2_TABLE_SIZE_REAL; 5801 pmap_kernel_l2ptp_phys += L2_TABLE_SIZE_REAL; 5802 } 5803 5804 return (l2b); 5805 } 5806 5807 vaddr_t 5808 pmap_growkernel(vaddr_t maxkvaddr) 5809 { 5810 pmap_t kpm = pmap_kernel(); 5811 #ifndef ARM_MMU_EXTENDED 5812 struct l1_ttable *l1; 5813 #endif 5814 int s; 5815 5816 if (maxkvaddr <= pmap_curmaxkvaddr) 5817 goto out; /* we are OK */ 5818 5819 NPDEBUG(PDB_GROWKERN, 5820 printf("pmap_growkernel: growing kernel from 0x%lx to 0x%lx\n", 5821 pmap_curmaxkvaddr, maxkvaddr)); 5822 5823 KDASSERT(maxkvaddr <= virtual_end); 5824 5825 /* 5826 * whoops! we need to add kernel PTPs 5827 */ 5828 5829 s = splhigh(); /* to be safe */ 5830 mutex_enter(kpm->pm_lock); 5831 5832 /* Map 1MB at a time */ 5833 size_t l1slot = l1pte_index(pmap_curmaxkvaddr); 5834 #ifdef ARM_MMU_EXTENDED 5835 pd_entry_t * const spdep = &kpm->pm_l1[l1slot]; 5836 pd_entry_t *pdep = spdep; 5837 #endif 5838 for (;pmap_curmaxkvaddr < maxkvaddr; pmap_curmaxkvaddr += L1_S_SIZE, 5839 #ifdef ARM_MMU_EXTENDED 5840 pdep++, 5841 #endif 5842 l1slot++) { 5843 struct l2_bucket *l2b = 5844 pmap_grow_l2_bucket(kpm, pmap_curmaxkvaddr); 5845 KASSERT(l2b != NULL); 5846 5847 const pd_entry_t npde = L1_C_PROTO | l2b->l2b_pa 5848 | L1_C_DOM(PMAP_DOMAIN_KERNEL); 5849 #ifdef ARM_MMU_EXTENDED 5850 l1pte_setone(pdep, npde); 5851 #else 5852 /* Distribute new L1 entry to all other L1s */ 5853 SLIST_FOREACH(l1, &l1_list, l1_link) { 5854 pd_entry_t * const pdep = &l1->l1_kva[l1slot]; 5855 l1pte_setone(pdep, npde); 5856 PDE_SYNC(pdep); 5857 } 5858 #endif 5859 } 5860 #ifdef ARM_MMU_EXTENDED 5861 PDE_SYNC_RANGE(spdep, pdep - spdep); 5862 #endif 5863 5864 #ifdef PMAP_CACHE_VIVT 5865 /* 5866 * flush out the cache, expensive but growkernel will happen so 5867 * rarely 5868 */ 5869 cpu_dcache_wbinv_all(); 5870 cpu_tlb_flushD(); 5871 cpu_cpwait(); 5872 #endif 5873 5874 mutex_exit(kpm->pm_lock); 5875 splx(s); 5876 5877 out: 5878 return (pmap_curmaxkvaddr); 5879 } 5880 5881 /************************ Utility routines ****************************/ 5882 5883 #ifndef ARM_HAS_VBAR 5884 /* 5885 * vector_page_setprot: 5886 * 5887 * Manipulate the protection of the vector page. 5888 */ 5889 void 5890 vector_page_setprot(int prot) 5891 { 5892 struct l2_bucket *l2b; 5893 pt_entry_t *ptep; 5894 5895 #if defined(CPU_ARMV7) || defined(CPU_ARM11) 5896 /* 5897 * If we are using VBAR to use the vectors in the kernel, then it's 5898 * already mapped in the kernel text so no need to anything here. 5899 */ 5900 if (vector_page != ARM_VECTORS_LOW && vector_page != ARM_VECTORS_HIGH) { 5901 KASSERT((armreg_pfr1_read() & ARM_PFR1_SEC_MASK) != 0); 5902 return; 5903 } 5904 #endif 5905 5906 l2b = pmap_get_l2_bucket(pmap_kernel(), vector_page); 5907 KASSERT(l2b != NULL); 5908 5909 ptep = &l2b->l2b_kva[l2pte_index(vector_page)]; 5910 5911 const pt_entry_t opte = *ptep; 5912 #ifdef ARM_MMU_EXTENDED 5913 const pt_entry_t npte = (opte & ~(L2_S_PROT_MASK|L2_XS_XN)) 5914 | L2_S_PROT(PTE_KERNEL, prot); 5915 #else 5916 const pt_entry_t npte = (opte & ~L2_S_PROT_MASK) 5917 | L2_S_PROT(PTE_KERNEL, prot); 5918 #endif 5919 l2pte_set(ptep, npte, opte); 5920 PTE_SYNC(ptep); 5921 cpu_tlb_flushD_SE(vector_page); 5922 cpu_cpwait(); 5923 } 5924 #endif 5925 5926 /* 5927 * Fetch pointers to the PDE/PTE for the given pmap/VA pair. 5928 * Returns true if the mapping exists, else false. 5929 * 5930 * NOTE: This function is only used by a couple of arm-specific modules. 5931 * It is not safe to take any pmap locks here, since we could be right 5932 * in the middle of debugging the pmap anyway... 5933 * 5934 * It is possible for this routine to return false even though a valid 5935 * mapping does exist. This is because we don't lock, so the metadata 5936 * state may be inconsistent. 5937 * 5938 * NOTE: We can return a NULL *ptp in the case where the L1 pde is 5939 * a "section" mapping. 5940 */ 5941 bool 5942 pmap_get_pde_pte(pmap_t pm, vaddr_t va, pd_entry_t **pdp, pt_entry_t **ptp) 5943 { 5944 struct l2_dtable *l2; 5945 pd_entry_t *pdep, pde; 5946 pt_entry_t *ptep; 5947 u_short l1slot; 5948 5949 if (pm->pm_l1 == NULL) 5950 return false; 5951 5952 l1slot = l1pte_index(va); 5953 *pdp = pdep = pmap_l1_kva(pm) + l1slot; 5954 pde = *pdep; 5955 5956 if (l1pte_section_p(pde)) { 5957 *ptp = NULL; 5958 return true; 5959 } 5960 5961 l2 = pm->pm_l2[L2_IDX(l1slot)]; 5962 if (l2 == NULL || 5963 (ptep = l2->l2_bucket[L2_BUCKET(l1slot)].l2b_kva) == NULL) { 5964 return false; 5965 } 5966 5967 *ptp = &ptep[l2pte_index(va)]; 5968 return true; 5969 } 5970 5971 bool 5972 pmap_get_pde(pmap_t pm, vaddr_t va, pd_entry_t **pdp) 5973 { 5974 5975 if (pm->pm_l1 == NULL) 5976 return false; 5977 5978 *pdp = pmap_l1_kva(pm) + l1pte_index(va); 5979 5980 return true; 5981 } 5982 5983 /************************ Bootstrapping routines ****************************/ 5984 5985 #ifndef ARM_MMU_EXTENDED 5986 static void 5987 pmap_init_l1(struct l1_ttable *l1, pd_entry_t *l1pt) 5988 { 5989 int i; 5990 5991 l1->l1_kva = l1pt; 5992 l1->l1_domain_use_count = 0; 5993 l1->l1_domain_first = 0; 5994 5995 for (i = 0; i < PMAP_DOMAINS; i++) 5996 l1->l1_domain_free[i] = i + 1; 5997 5998 /* 5999 * Copy the kernel's L1 entries to each new L1. 6000 */ 6001 if (pmap_initialized) 6002 memcpy(l1pt, pmap_l1_kva(pmap_kernel()), L1_TABLE_SIZE); 6003 6004 if (pmap_extract(pmap_kernel(), (vaddr_t)l1pt, 6005 &l1->l1_physaddr) == false) 6006 panic("pmap_init_l1: can't get PA of L1 at %p", l1pt); 6007 6008 SLIST_INSERT_HEAD(&l1_list, l1, l1_link); 6009 TAILQ_INSERT_TAIL(&l1_lru_list, l1, l1_lru); 6010 } 6011 #endif /* !ARM_MMU_EXTENDED */ 6012 6013 /* 6014 * pmap_bootstrap() is called from the board-specific initarm() routine 6015 * once the kernel L1/L2 descriptors tables have been set up. 6016 * 6017 * This is a somewhat convoluted process since pmap bootstrap is, effectively, 6018 * spread over a number of disparate files/functions. 6019 * 6020 * We are passed the following parameters 6021 * - kernel_l1pt 6022 * This is a pointer to the base of the kernel's L1 translation table. 6023 * - vstart 6024 * 1MB-aligned start of managed kernel virtual memory. 6025 * - vend 6026 * 1MB-aligned end of managed kernel virtual memory. 6027 * 6028 * We use the first parameter to build the metadata (struct l1_ttable and 6029 * struct l2_dtable) necessary to track kernel mappings. 6030 */ 6031 #define PMAP_STATIC_L2_SIZE 16 6032 void 6033 pmap_bootstrap(vaddr_t vstart, vaddr_t vend) 6034 { 6035 static struct l2_dtable static_l2[PMAP_STATIC_L2_SIZE]; 6036 #ifndef ARM_MMU_EXTENDED 6037 static struct l1_ttable static_l1; 6038 struct l1_ttable *l1 = &static_l1; 6039 #endif 6040 struct l2_dtable *l2; 6041 struct l2_bucket *l2b; 6042 pd_entry_t *l1pt = (pd_entry_t *) kernel_l1pt.pv_va; 6043 pmap_t pm = pmap_kernel(); 6044 pt_entry_t *ptep; 6045 paddr_t pa; 6046 vsize_t size; 6047 int nptes, l2idx, l2next = 0; 6048 6049 #ifdef ARM_MMU_EXTENDED 6050 KASSERT(pte_l1_s_cache_mode == pte_l1_s_cache_mode_pt); 6051 KASSERT(pte_l2_s_cache_mode == pte_l2_s_cache_mode_pt); 6052 #endif 6053 6054 #ifdef VERBOSE_INIT_ARM 6055 printf("kpm "); 6056 #endif 6057 /* 6058 * Initialise the kernel pmap object 6059 */ 6060 curcpu()->ci_pmap_cur = pm; 6061 #ifdef ARM_MMU_EXTENDED 6062 pm->pm_l1 = l1pt; 6063 pm->pm_l1_pa = kernel_l1pt.pv_pa; 6064 #ifdef VERBOSE_INIT_ARM 6065 printf("tlb0 "); 6066 #endif 6067 pmap_tlb_info_init(&pmap_tlb0_info); 6068 #ifdef MULTIPROCESSOR 6069 #ifdef VERBOSE_INIT_ARM 6070 printf("kcpusets "); 6071 #endif 6072 pm->pm_onproc = kcpuset_running; 6073 pm->pm_active = kcpuset_running; 6074 #endif 6075 #else 6076 pm->pm_l1 = l1; 6077 #endif 6078 6079 #ifdef VERBOSE_INIT_ARM 6080 printf("locks "); 6081 #endif 6082 #if defined(PMAP_CACHE_VIPT) && !defined(ARM_MMU_EXTENDED) 6083 if (arm_cache_prefer_mask != 0) { 6084 mutex_init(&pmap_lock, MUTEX_DEFAULT, IPL_VM); 6085 } else { 6086 #endif 6087 mutex_init(&pmap_lock, MUTEX_DEFAULT, IPL_NONE); 6088 #if defined(PMAP_CACHE_VIPT) && !defined(ARM_MMU_EXTENDED) 6089 } 6090 #endif 6091 mutex_init(&pm->pm_obj_lock, MUTEX_DEFAULT, IPL_NONE); 6092 uvm_obj_init(&pm->pm_obj, NULL, false, 1); 6093 uvm_obj_setlock(&pm->pm_obj, &pm->pm_obj_lock); 6094 6095 #ifdef VERBOSE_INIT_ARM 6096 printf("l1pt "); 6097 #endif 6098 /* 6099 * Scan the L1 translation table created by initarm() and create 6100 * the required metadata for all valid mappings found in it. 6101 */ 6102 for (size_t l1slot = 0; 6103 l1slot < L1_TABLE_SIZE / sizeof(pd_entry_t); 6104 l1slot++) { 6105 pd_entry_t pde = l1pt[l1slot]; 6106 6107 /* 6108 * We're only interested in Coarse mappings. 6109 * pmap_extract() can deal with section mappings without 6110 * recourse to checking L2 metadata. 6111 */ 6112 if ((pde & L1_TYPE_MASK) != L1_TYPE_C) 6113 continue; 6114 6115 /* 6116 * Lookup the KVA of this L2 descriptor table 6117 */ 6118 pa = l1pte_pa(pde); 6119 ptep = (pt_entry_t *)kernel_pt_lookup(pa); 6120 if (ptep == NULL) { 6121 panic("pmap_bootstrap: No L2 for va 0x%x, pa 0x%lx", 6122 (u_int)l1slot << L1_S_SHIFT, pa); 6123 } 6124 6125 /* 6126 * Fetch the associated L2 metadata structure. 6127 * Allocate a new one if necessary. 6128 */ 6129 if ((l2 = pm->pm_l2[L2_IDX(l1slot)]) == NULL) { 6130 if (l2next == PMAP_STATIC_L2_SIZE) 6131 panic("pmap_bootstrap: out of static L2s"); 6132 pm->pm_l2[L2_IDX(l1slot)] = l2 = &static_l2[l2next++]; 6133 } 6134 6135 /* 6136 * One more L1 slot tracked... 6137 */ 6138 l2->l2_occupancy++; 6139 6140 /* 6141 * Fill in the details of the L2 descriptor in the 6142 * appropriate bucket. 6143 */ 6144 l2b = &l2->l2_bucket[L2_BUCKET(l1slot)]; 6145 l2b->l2b_kva = ptep; 6146 l2b->l2b_pa = pa; 6147 l2b->l2b_l1slot = l1slot; 6148 6149 /* 6150 * Establish an initial occupancy count for this descriptor 6151 */ 6152 for (l2idx = 0; 6153 l2idx < (L2_TABLE_SIZE_REAL / sizeof(pt_entry_t)); 6154 l2idx++) { 6155 if ((ptep[l2idx] & L2_TYPE_MASK) != L2_TYPE_INV) { 6156 l2b->l2b_occupancy++; 6157 } 6158 } 6159 6160 /* 6161 * Make sure the descriptor itself has the correct cache mode. 6162 * If not, fix it, but whine about the problem. Port-meisters 6163 * should consider this a clue to fix up their initarm() 6164 * function. :) 6165 */ 6166 if (pmap_set_pt_cache_mode(l1pt, (vaddr_t)ptep, 1)) { 6167 printf("pmap_bootstrap: WARNING! wrong cache mode for " 6168 "L2 pte @ %p\n", ptep); 6169 } 6170 } 6171 6172 #ifdef VERBOSE_INIT_ARM 6173 printf("cache(l1pt) "); 6174 #endif 6175 /* 6176 * Ensure the primary (kernel) L1 has the correct cache mode for 6177 * a page table. Bitch if it is not correctly set. 6178 */ 6179 if (pmap_set_pt_cache_mode(l1pt, kernel_l1pt.pv_va, 6180 L1_TABLE_SIZE / L2_S_SIZE)) { 6181 printf("pmap_bootstrap: WARNING! wrong cache mode for " 6182 "primary L1 @ 0x%lx\n", kernel_l1pt.pv_va); 6183 } 6184 6185 #ifdef PMAP_CACHE_VIVT 6186 cpu_dcache_wbinv_all(); 6187 cpu_tlb_flushID(); 6188 cpu_cpwait(); 6189 #endif 6190 6191 /* 6192 * now we allocate the "special" VAs which are used for tmp mappings 6193 * by the pmap (and other modules). we allocate the VAs by advancing 6194 * virtual_avail (note that there are no pages mapped at these VAs). 6195 * 6196 * Managed KVM space start from wherever initarm() tells us. 6197 */ 6198 virtual_avail = vstart; 6199 virtual_end = vend; 6200 6201 #ifdef VERBOSE_INIT_ARM 6202 printf("specials "); 6203 #endif 6204 #ifdef PMAP_CACHE_VIPT 6205 /* 6206 * If we have a VIPT cache, we need one page/pte per possible alias 6207 * page so we won't violate cache aliasing rules. 6208 */ 6209 virtual_avail = (virtual_avail + arm_cache_prefer_mask) & ~arm_cache_prefer_mask; 6210 nptes = (arm_cache_prefer_mask >> L2_S_SHIFT) + 1; 6211 nptes = roundup(nptes, PAGE_SIZE / L2_S_SIZE); 6212 if (arm_pcache.icache_type != CACHE_TYPE_PIPT 6213 && arm_pcache.icache_way_size > nptes * L2_S_SIZE) { 6214 nptes = arm_pcache.icache_way_size >> L2_S_SHIFT; 6215 nptes = roundup(nptes, PAGE_SIZE / L2_S_SIZE); 6216 } 6217 #else 6218 nptes = PAGE_SIZE / L2_S_SIZE; 6219 #endif 6220 #ifdef MULTIPROCESSOR 6221 cnptes = nptes; 6222 nptes *= arm_cpu_max; 6223 #endif 6224 pmap_alloc_specials(&virtual_avail, nptes, &csrcp, &csrc_pte); 6225 pmap_set_pt_cache_mode(l1pt, (vaddr_t)csrc_pte, nptes); 6226 pmap_alloc_specials(&virtual_avail, nptes, &cdstp, &cdst_pte); 6227 pmap_set_pt_cache_mode(l1pt, (vaddr_t)cdst_pte, nptes); 6228 pmap_alloc_specials(&virtual_avail, nptes, &memhook, NULL); 6229 if (msgbufaddr == NULL) { 6230 pmap_alloc_specials(&virtual_avail, 6231 round_page(MSGBUFSIZE) / PAGE_SIZE, 6232 (void *)&msgbufaddr, NULL); 6233 } 6234 6235 /* 6236 * Allocate a range of kernel virtual address space to be used 6237 * for L2 descriptor tables and metadata allocation in 6238 * pmap_growkernel(). 6239 */ 6240 size = ((virtual_end - pmap_curmaxkvaddr) + L1_S_OFFSET) / L1_S_SIZE; 6241 pmap_alloc_specials(&virtual_avail, 6242 round_page(size * L2_TABLE_SIZE_REAL) / PAGE_SIZE, 6243 &pmap_kernel_l2ptp_kva, NULL); 6244 6245 size = (size + (L2_BUCKET_SIZE - 1)) / L2_BUCKET_SIZE; 6246 pmap_alloc_specials(&virtual_avail, 6247 round_page(size * sizeof(struct l2_dtable)) / PAGE_SIZE, 6248 &pmap_kernel_l2dtable_kva, NULL); 6249 6250 #ifndef ARM_MMU_EXTENDED 6251 /* 6252 * init the static-global locks and global pmap list. 6253 */ 6254 mutex_init(&l1_lru_lock, MUTEX_DEFAULT, IPL_VM); 6255 6256 /* 6257 * We can now initialise the first L1's metadata. 6258 */ 6259 SLIST_INIT(&l1_list); 6260 TAILQ_INIT(&l1_lru_list); 6261 pmap_init_l1(l1, l1pt); 6262 #endif /* ARM_MMU_EXTENDED */ 6263 6264 #ifndef ARM_HAS_VBAR 6265 /* Set up vector page L1 details, if necessary */ 6266 if (vector_page < KERNEL_BASE) { 6267 pm->pm_pl1vec = pmap_l1_kva(pm) + l1pte_index(vector_page); 6268 l2b = pmap_get_l2_bucket(pm, vector_page); 6269 KDASSERT(l2b != NULL); 6270 pm->pm_l1vec = l2b->l2b_pa | L1_C_PROTO | 6271 L1_C_DOM(pmap_domain(pm)); 6272 } else 6273 pm->pm_pl1vec = NULL; 6274 #endif 6275 6276 #ifdef VERBOSE_INIT_ARM 6277 printf("pools "); 6278 #endif 6279 /* 6280 * Initialize the pmap cache 6281 */ 6282 pool_cache_bootstrap(&pmap_cache, sizeof(struct pmap), 0, 0, 0, 6283 "pmappl", NULL, IPL_NONE, pmap_pmap_ctor, NULL, NULL); 6284 6285 /* 6286 * Initialize the pv pool. 6287 */ 6288 pool_init(&pmap_pv_pool, sizeof(struct pv_entry), 0, 0, 0, "pvepl", 6289 &pmap_bootstrap_pv_allocator, IPL_NONE); 6290 6291 /* 6292 * Initialize the L2 dtable pool and cache. 6293 */ 6294 pool_cache_bootstrap(&pmap_l2dtable_cache, sizeof(struct l2_dtable), 0, 6295 0, 0, "l2dtblpl", NULL, IPL_NONE, pmap_l2dtable_ctor, NULL, NULL); 6296 6297 /* 6298 * Initialise the L2 descriptor table pool and cache 6299 */ 6300 pool_cache_bootstrap(&pmap_l2ptp_cache, L2_TABLE_SIZE_REAL, 0, 6301 L2_TABLE_SIZE_REAL, 0, "l2ptppl", NULL, IPL_NONE, 6302 pmap_l2ptp_ctor, NULL, NULL); 6303 6304 mutex_init(&memlock, MUTEX_DEFAULT, IPL_NONE); 6305 6306 cpu_dcache_wbinv_all(); 6307 } 6308 6309 static bool 6310 pmap_set_pt_cache_mode(pd_entry_t *kl1, vaddr_t va, size_t nptes) 6311 { 6312 #ifdef ARM_MMU_EXTENDED 6313 return false; 6314 #else 6315 if (pte_l1_s_cache_mode == pte_l1_s_cache_mode_pt 6316 && pte_l2_s_cache_mode == pte_l2_s_cache_mode_pt) 6317 return false; 6318 6319 const vaddr_t eva = va + nptes * PAGE_SIZE; 6320 int rv = 0; 6321 6322 while (va < eva) { 6323 /* 6324 * Make sure the descriptor itself has the correct cache mode 6325 */ 6326 pd_entry_t * const pdep = &kl1[l1pte_index(va)]; 6327 pd_entry_t pde = *pdep; 6328 6329 if (l1pte_section_p(pde)) { 6330 __CTASSERT((L1_S_CACHE_MASK & L1_S_V6_SUPER) == 0); 6331 if ((pde & L1_S_CACHE_MASK) != pte_l1_s_cache_mode_pt) { 6332 *pdep = (pde & ~L1_S_CACHE_MASK) | 6333 pte_l1_s_cache_mode_pt; 6334 PDE_SYNC(pdep); 6335 cpu_dcache_wbinv_range((vaddr_t)pdep, 6336 sizeof(*pdep)); 6337 rv = 1; 6338 } 6339 return rv; 6340 } 6341 vaddr_t pa = l1pte_pa(pde); 6342 pt_entry_t *ptep = (pt_entry_t *)kernel_pt_lookup(pa); 6343 if (ptep == NULL) 6344 panic("pmap_bootstrap: No PTP for va %#lx\n", va); 6345 6346 ptep += l2pte_index(va); 6347 const pt_entry_t opte = *ptep; 6348 if ((opte & L2_S_CACHE_MASK) != pte_l2_s_cache_mode_pt) { 6349 const pt_entry_t npte = (opte & ~L2_S_CACHE_MASK) 6350 | pte_l2_s_cache_mode_pt; 6351 l2pte_set(ptep, npte, opte); 6352 PTE_SYNC(ptep); 6353 cpu_dcache_wbinv_range((vaddr_t)ptep, sizeof(*ptep)); 6354 rv = 1; 6355 } 6356 va += PAGE_SIZE; 6357 } 6358 6359 return (rv); 6360 #endif 6361 } 6362 6363 static void 6364 pmap_alloc_specials(vaddr_t *availp, int pages, vaddr_t *vap, pt_entry_t **ptep) 6365 { 6366 vaddr_t va = *availp; 6367 struct l2_bucket *l2b; 6368 6369 if (ptep) { 6370 l2b = pmap_get_l2_bucket(pmap_kernel(), va); 6371 if (l2b == NULL) 6372 panic("pmap_alloc_specials: no l2b for 0x%lx", va); 6373 6374 if (ptep) 6375 *ptep = &l2b->l2b_kva[l2pte_index(va)]; 6376 } 6377 6378 *vap = va; 6379 *availp = va + (PAGE_SIZE * pages); 6380 } 6381 6382 void 6383 pmap_init(void) 6384 { 6385 6386 /* 6387 * Set the available memory vars - These do not map to real memory 6388 * addresses and cannot as the physical memory is fragmented. 6389 * They are used by ps for %mem calculations. 6390 * One could argue whether this should be the entire memory or just 6391 * the memory that is useable in a user process. 6392 */ 6393 avail_start = ptoa(VM_PHYSMEM_PTR(0)->start); 6394 avail_end = ptoa(VM_PHYSMEM_PTR(vm_nphysseg - 1)->end); 6395 6396 /* 6397 * Now we need to free enough pv_entry structures to allow us to get 6398 * the kmem_map/kmem_object allocated and inited (done after this 6399 * function is finished). to do this we allocate one bootstrap page out 6400 * of kernel_map and use it to provide an initial pool of pv_entry 6401 * structures. we never free this page. 6402 */ 6403 pool_setlowat(&pmap_pv_pool, (PAGE_SIZE / sizeof(struct pv_entry)) * 2); 6404 6405 #ifdef ARM_MMU_EXTENDED 6406 pmap_tlb_info_evcnt_attach(&pmap_tlb0_info); 6407 #endif 6408 6409 pmap_initialized = true; 6410 } 6411 6412 static vaddr_t last_bootstrap_page = 0; 6413 static void *free_bootstrap_pages = NULL; 6414 6415 static void * 6416 pmap_bootstrap_pv_page_alloc(struct pool *pp, int flags) 6417 { 6418 extern void *pool_page_alloc(struct pool *, int); 6419 vaddr_t new_page; 6420 void *rv; 6421 6422 if (pmap_initialized) 6423 return (pool_page_alloc(pp, flags)); 6424 6425 if (free_bootstrap_pages) { 6426 rv = free_bootstrap_pages; 6427 free_bootstrap_pages = *((void **)rv); 6428 return (rv); 6429 } 6430 6431 KASSERT(kernel_map != NULL); 6432 new_page = uvm_km_alloc(kernel_map, PAGE_SIZE, 0, 6433 UVM_KMF_WIRED | ((flags & PR_WAITOK) ? 0 : UVM_KMF_NOWAIT)); 6434 6435 KASSERT(new_page > last_bootstrap_page); 6436 last_bootstrap_page = new_page; 6437 return ((void *)new_page); 6438 } 6439 6440 static void 6441 pmap_bootstrap_pv_page_free(struct pool *pp, void *v) 6442 { 6443 extern void pool_page_free(struct pool *, void *); 6444 6445 if ((vaddr_t)v <= last_bootstrap_page) { 6446 *((void **)v) = free_bootstrap_pages; 6447 free_bootstrap_pages = v; 6448 return; 6449 } 6450 6451 if (pmap_initialized) { 6452 pool_page_free(pp, v); 6453 return; 6454 } 6455 } 6456 6457 /* 6458 * pmap_postinit() 6459 * 6460 * This routine is called after the vm and kmem subsystems have been 6461 * initialised. This allows the pmap code to perform any initialisation 6462 * that can only be done one the memory allocation is in place. 6463 */ 6464 void 6465 pmap_postinit(void) 6466 { 6467 #ifndef ARM_MMU_EXTENDED 6468 extern paddr_t physical_start, physical_end; 6469 struct l1_ttable *l1; 6470 struct pglist plist; 6471 struct vm_page *m; 6472 pd_entry_t *pdep; 6473 vaddr_t va, eva; 6474 u_int loop, needed; 6475 int error; 6476 #endif 6477 6478 pool_cache_setlowat(&pmap_l2ptp_cache, (PAGE_SIZE / L2_TABLE_SIZE_REAL) * 4); 6479 pool_cache_setlowat(&pmap_l2dtable_cache, 6480 (PAGE_SIZE / sizeof(struct l2_dtable)) * 2); 6481 6482 #ifndef ARM_MMU_EXTENDED 6483 needed = (maxproc / PMAP_DOMAINS) + ((maxproc % PMAP_DOMAINS) ? 1 : 0); 6484 needed -= 1; 6485 6486 l1 = kmem_alloc(sizeof(*l1) * needed, KM_SLEEP); 6487 6488 for (loop = 0; loop < needed; loop++, l1++) { 6489 /* Allocate a L1 page table */ 6490 va = uvm_km_alloc(kernel_map, L1_TABLE_SIZE, 0, UVM_KMF_VAONLY); 6491 if (va == 0) 6492 panic("Cannot allocate L1 KVM"); 6493 6494 error = uvm_pglistalloc(L1_TABLE_SIZE, physical_start, 6495 physical_end, L1_TABLE_SIZE, 0, &plist, 1, 1); 6496 if (error) 6497 panic("Cannot allocate L1 physical pages"); 6498 6499 m = TAILQ_FIRST(&plist); 6500 eva = va + L1_TABLE_SIZE; 6501 pdep = (pd_entry_t *)va; 6502 6503 while (m && va < eva) { 6504 paddr_t pa = VM_PAGE_TO_PHYS(m); 6505 6506 pmap_kenter_pa(va, pa, 6507 VM_PROT_READ|VM_PROT_WRITE, PMAP_KMPAGE|PMAP_PTE); 6508 6509 va += PAGE_SIZE; 6510 m = TAILQ_NEXT(m, pageq.queue); 6511 } 6512 6513 #ifdef DIAGNOSTIC 6514 if (m) 6515 panic("pmap_alloc_l1pt: pglist not empty"); 6516 #endif /* DIAGNOSTIC */ 6517 6518 pmap_init_l1(l1, pdep); 6519 } 6520 6521 #ifdef DEBUG 6522 printf("pmap_postinit: Allocated %d static L1 descriptor tables\n", 6523 needed); 6524 #endif 6525 #endif /* !ARM_MMU_EXTENDED */ 6526 } 6527 6528 /* 6529 * Note that the following routines are used by board-specific initialisation 6530 * code to configure the initial kernel page tables. 6531 * 6532 * If ARM32_NEW_VM_LAYOUT is *not* defined, they operate on the assumption that 6533 * L2 page-table pages are 4KB in size and use 4 L1 slots. This mimics the 6534 * behaviour of the old pmap, and provides an easy migration path for 6535 * initial bring-up of the new pmap on existing ports. Fortunately, 6536 * pmap_bootstrap() compensates for this hackery. This is only a stop-gap and 6537 * will be deprecated. 6538 * 6539 * If ARM32_NEW_VM_LAYOUT *is* defined, these functions deal with 1KB L2 page 6540 * tables. 6541 */ 6542 6543 /* 6544 * This list exists for the benefit of pmap_map_chunk(). It keeps track 6545 * of the kernel L2 tables during bootstrap, so that pmap_map_chunk() can 6546 * find them as necessary. 6547 * 6548 * Note that the data on this list MUST remain valid after initarm() returns, 6549 * as pmap_bootstrap() uses it to contruct L2 table metadata. 6550 */ 6551 SLIST_HEAD(, pv_addr) kernel_pt_list = SLIST_HEAD_INITIALIZER(kernel_pt_list); 6552 6553 static vaddr_t 6554 kernel_pt_lookup(paddr_t pa) 6555 { 6556 pv_addr_t *pv; 6557 6558 SLIST_FOREACH(pv, &kernel_pt_list, pv_list) { 6559 if (pv->pv_pa == (pa & ~PGOFSET)) 6560 return (pv->pv_va | (pa & PGOFSET)); 6561 } 6562 return (0); 6563 } 6564 6565 /* 6566 * pmap_map_section: 6567 * 6568 * Create a single section mapping. 6569 */ 6570 void 6571 pmap_map_section(vaddr_t l1pt, vaddr_t va, paddr_t pa, int prot, int cache) 6572 { 6573 pd_entry_t * const pdep = (pd_entry_t *) l1pt; 6574 const size_t l1slot = l1pte_index(va); 6575 pd_entry_t fl; 6576 6577 KASSERT(((va | pa) & L1_S_OFFSET) == 0); 6578 6579 switch (cache) { 6580 case PTE_NOCACHE: 6581 default: 6582 fl = 0; 6583 break; 6584 6585 case PTE_CACHE: 6586 fl = pte_l1_s_cache_mode; 6587 break; 6588 6589 case PTE_PAGETABLE: 6590 fl = pte_l1_s_cache_mode_pt; 6591 break; 6592 } 6593 6594 const pd_entry_t npde = L1_S_PROTO | pa | 6595 L1_S_PROT(PTE_KERNEL, prot) | fl | L1_S_DOM(PMAP_DOMAIN_KERNEL); 6596 l1pte_setone(pdep + l1slot, npde); 6597 PDE_SYNC(pdep + l1slot); 6598 } 6599 6600 /* 6601 * pmap_map_entry: 6602 * 6603 * Create a single page mapping. 6604 */ 6605 void 6606 pmap_map_entry(vaddr_t l1pt, vaddr_t va, paddr_t pa, int prot, int cache) 6607 { 6608 pd_entry_t * const pdep = (pd_entry_t *) l1pt; 6609 const size_t l1slot = l1pte_index(va); 6610 pt_entry_t npte; 6611 pt_entry_t *ptep; 6612 6613 KASSERT(((va | pa) & PGOFSET) == 0); 6614 6615 switch (cache) { 6616 case PTE_NOCACHE: 6617 default: 6618 npte = 0; 6619 break; 6620 6621 case PTE_CACHE: 6622 npte = pte_l2_s_cache_mode; 6623 break; 6624 6625 case PTE_PAGETABLE: 6626 npte = pte_l2_s_cache_mode_pt; 6627 break; 6628 } 6629 6630 if ((pdep[l1slot] & L1_TYPE_MASK) != L1_TYPE_C) 6631 panic("pmap_map_entry: no L2 table for VA 0x%08lx", va); 6632 6633 ptep = (pt_entry_t *) kernel_pt_lookup(l1pte_pa(pdep[l1slot])); 6634 if (ptep == NULL) 6635 panic("pmap_map_entry: can't find L2 table for VA 0x%08lx", va); 6636 6637 npte |= L2_S_PROTO | pa | L2_S_PROT(PTE_KERNEL, prot); 6638 #ifdef ARM_MMU_EXTENDED 6639 if (prot & VM_PROT_EXECUTE) { 6640 npte &= ~L2_XS_XN; 6641 } 6642 #endif 6643 ptep += l2pte_index(va); 6644 l2pte_set(ptep, npte, 0); 6645 PTE_SYNC(ptep); 6646 } 6647 6648 /* 6649 * pmap_link_l2pt: 6650 * 6651 * Link the L2 page table specified by "l2pv" into the L1 6652 * page table at the slot for "va". 6653 */ 6654 void 6655 pmap_link_l2pt(vaddr_t l1pt, vaddr_t va, pv_addr_t *l2pv) 6656 { 6657 pd_entry_t * const pdep = (pd_entry_t *) l1pt + l1pte_index(va); 6658 6659 KASSERT((va & ((L1_S_SIZE * (PAGE_SIZE / L2_T_SIZE)) - 1)) == 0); 6660 KASSERT((l2pv->pv_pa & PGOFSET) == 0); 6661 6662 const pd_entry_t npde = L1_S_DOM(PMAP_DOMAIN_KERNEL) | L1_C_PROTO 6663 | l2pv->pv_pa; 6664 6665 l1pte_set(pdep, npde); 6666 PDE_SYNC_RANGE(pdep, PAGE_SIZE / L2_T_SIZE); 6667 6668 SLIST_INSERT_HEAD(&kernel_pt_list, l2pv, pv_list); 6669 } 6670 6671 /* 6672 * pmap_map_chunk: 6673 * 6674 * Map a chunk of memory using the most efficient mappings 6675 * possible (section, large page, small page) into the 6676 * provided L1 and L2 tables at the specified virtual address. 6677 */ 6678 vsize_t 6679 pmap_map_chunk(vaddr_t l1pt, vaddr_t va, paddr_t pa, vsize_t size, 6680 int prot, int cache) 6681 { 6682 pd_entry_t * const pdep = (pd_entry_t *) l1pt; 6683 pt_entry_t f1, f2s, f2l; 6684 vsize_t resid; 6685 6686 resid = (size + (PAGE_SIZE - 1)) & ~(PAGE_SIZE - 1); 6687 6688 if (l1pt == 0) 6689 panic("pmap_map_chunk: no L1 table provided"); 6690 6691 #ifdef VERBOSE_INIT_ARM 6692 printf("pmap_map_chunk: pa=0x%lx va=0x%lx size=0x%lx resid=0x%lx " 6693 "prot=0x%x cache=%d\n", pa, va, size, resid, prot, cache); 6694 #endif 6695 6696 switch (cache) { 6697 case PTE_NOCACHE: 6698 default: 6699 f1 = 0; 6700 f2l = 0; 6701 f2s = 0; 6702 break; 6703 6704 case PTE_CACHE: 6705 f1 = pte_l1_s_cache_mode; 6706 f2l = pte_l2_l_cache_mode; 6707 f2s = pte_l2_s_cache_mode; 6708 break; 6709 6710 case PTE_PAGETABLE: 6711 f1 = pte_l1_s_cache_mode_pt; 6712 f2l = pte_l2_l_cache_mode_pt; 6713 f2s = pte_l2_s_cache_mode_pt; 6714 break; 6715 } 6716 6717 size = resid; 6718 6719 while (resid > 0) { 6720 const size_t l1slot = l1pte_index(va); 6721 #if (ARM_MMU_V6 + ARM_MMU_V7) > 0 6722 /* See if we can use a supersection mapping. */ 6723 if (L1_SS_PROTO && L1_SS_MAPPABLE_P(va, pa, resid)) { 6724 /* Supersection are always domain 0 */ 6725 const pd_entry_t npde = L1_SS_PROTO | pa 6726 #ifdef ARM_MMU_EXTENDED 6727 | ((prot & VM_PROT_EXECUTE) ? 0 : L1_S_V6_XN) 6728 | (va & 0x80000000 ? 0 : L1_S_V6_nG) 6729 #endif 6730 | L1_S_PROT(PTE_KERNEL, prot) | f1; 6731 #ifdef VERBOSE_INIT_ARM 6732 printf("sS"); 6733 #endif 6734 l1pte_set(&pdep[l1slot], npde); 6735 PDE_SYNC_RANGE(&pdep[l1slot], L1_SS_SIZE / L1_S_SIZE); 6736 va += L1_SS_SIZE; 6737 pa += L1_SS_SIZE; 6738 resid -= L1_SS_SIZE; 6739 continue; 6740 } 6741 #endif 6742 /* See if we can use a section mapping. */ 6743 if (L1_S_MAPPABLE_P(va, pa, resid)) { 6744 const pd_entry_t npde = L1_S_PROTO | pa 6745 #ifdef ARM_MMU_EXTENDED 6746 | ((prot & VM_PROT_EXECUTE) ? 0 : L1_S_V6_XN) 6747 | (va & 0x80000000 ? 0 : L1_S_V6_nG) 6748 #endif 6749 | L1_S_PROT(PTE_KERNEL, prot) | f1 6750 | L1_S_DOM(PMAP_DOMAIN_KERNEL); 6751 #ifdef VERBOSE_INIT_ARM 6752 printf("S"); 6753 #endif 6754 l1pte_set(&pdep[l1slot], npde); 6755 PDE_SYNC(&pdep[l1slot]); 6756 va += L1_S_SIZE; 6757 pa += L1_S_SIZE; 6758 resid -= L1_S_SIZE; 6759 continue; 6760 } 6761 6762 /* 6763 * Ok, we're going to use an L2 table. Make sure 6764 * one is actually in the corresponding L1 slot 6765 * for the current VA. 6766 */ 6767 if ((pdep[l1slot] & L1_TYPE_MASK) != L1_TYPE_C) 6768 panic("%s: no L2 table for VA %#lx", __func__, va); 6769 6770 pt_entry_t *ptep = (pt_entry_t *) kernel_pt_lookup(l1pte_pa(pdep[l1slot])); 6771 if (ptep == NULL) 6772 panic("%s: can't find L2 table for VA %#lx", __func__, 6773 va); 6774 6775 ptep += l2pte_index(va); 6776 6777 /* See if we can use a L2 large page mapping. */ 6778 if (L2_L_MAPPABLE_P(va, pa, resid)) { 6779 const pt_entry_t npte = L2_L_PROTO | pa 6780 #ifdef ARM_MMU_EXTENDED 6781 | ((prot & VM_PROT_EXECUTE) ? 0 : L2_XS_L_XN) 6782 | (va & 0x80000000 ? 0 : L2_XS_nG) 6783 #endif 6784 | L2_L_PROT(PTE_KERNEL, prot) | f2l; 6785 #ifdef VERBOSE_INIT_ARM 6786 printf("L"); 6787 #endif 6788 l2pte_set(ptep, npte, 0); 6789 PTE_SYNC_RANGE(ptep, L2_L_SIZE / L2_S_SIZE); 6790 va += L2_L_SIZE; 6791 pa += L2_L_SIZE; 6792 resid -= L2_L_SIZE; 6793 continue; 6794 } 6795 6796 #ifdef VERBOSE_INIT_ARM 6797 printf("P"); 6798 #endif 6799 /* Use a small page mapping. */ 6800 pt_entry_t npte = L2_S_PROTO | pa 6801 #ifdef ARM_MMU_EXTENDED 6802 | ((prot & VM_PROT_EXECUTE) ? 0 : L2_XS_XN) 6803 | (va & 0x80000000 ? 0 : L2_XS_nG) 6804 #endif 6805 | L2_S_PROT(PTE_KERNEL, prot) | f2s; 6806 #ifdef ARM_MMU_EXTENDED 6807 npte &= ((prot & VM_PROT_EXECUTE) ? ~L2_XS_XN : ~0); 6808 #endif 6809 l2pte_set(ptep, npte, 0); 6810 PTE_SYNC(ptep); 6811 va += PAGE_SIZE; 6812 pa += PAGE_SIZE; 6813 resid -= PAGE_SIZE; 6814 } 6815 #ifdef VERBOSE_INIT_ARM 6816 printf("\n"); 6817 #endif 6818 return (size); 6819 } 6820 6821 /********************** Static device map routines ***************************/ 6822 6823 static const struct pmap_devmap *pmap_devmap_table; 6824 6825 /* 6826 * Register the devmap table. This is provided in case early console 6827 * initialization needs to register mappings created by bootstrap code 6828 * before pmap_devmap_bootstrap() is called. 6829 */ 6830 void 6831 pmap_devmap_register(const struct pmap_devmap *table) 6832 { 6833 6834 pmap_devmap_table = table; 6835 } 6836 6837 /* 6838 * Map all of the static regions in the devmap table, and remember 6839 * the devmap table so other parts of the kernel can look up entries 6840 * later. 6841 */ 6842 void 6843 pmap_devmap_bootstrap(vaddr_t l1pt, const struct pmap_devmap *table) 6844 { 6845 int i; 6846 6847 pmap_devmap_table = table; 6848 6849 for (i = 0; pmap_devmap_table[i].pd_size != 0; i++) { 6850 #ifdef VERBOSE_INIT_ARM 6851 printf("devmap: %08lx -> %08lx @ %08lx\n", 6852 pmap_devmap_table[i].pd_pa, 6853 pmap_devmap_table[i].pd_pa + 6854 pmap_devmap_table[i].pd_size - 1, 6855 pmap_devmap_table[i].pd_va); 6856 #endif 6857 pmap_map_chunk(l1pt, pmap_devmap_table[i].pd_va, 6858 pmap_devmap_table[i].pd_pa, 6859 pmap_devmap_table[i].pd_size, 6860 pmap_devmap_table[i].pd_prot, 6861 pmap_devmap_table[i].pd_cache); 6862 } 6863 } 6864 6865 const struct pmap_devmap * 6866 pmap_devmap_find_pa(paddr_t pa, psize_t size) 6867 { 6868 uint64_t endpa; 6869 int i; 6870 6871 if (pmap_devmap_table == NULL) 6872 return (NULL); 6873 6874 endpa = (uint64_t)pa + (uint64_t)(size - 1); 6875 6876 for (i = 0; pmap_devmap_table[i].pd_size != 0; i++) { 6877 if (pa >= pmap_devmap_table[i].pd_pa && 6878 endpa <= (uint64_t)pmap_devmap_table[i].pd_pa + 6879 (uint64_t)(pmap_devmap_table[i].pd_size - 1)) 6880 return (&pmap_devmap_table[i]); 6881 } 6882 6883 return (NULL); 6884 } 6885 6886 const struct pmap_devmap * 6887 pmap_devmap_find_va(vaddr_t va, vsize_t size) 6888 { 6889 int i; 6890 6891 if (pmap_devmap_table == NULL) 6892 return (NULL); 6893 6894 for (i = 0; pmap_devmap_table[i].pd_size != 0; i++) { 6895 if (va >= pmap_devmap_table[i].pd_va && 6896 va + size - 1 <= pmap_devmap_table[i].pd_va + 6897 pmap_devmap_table[i].pd_size - 1) 6898 return (&pmap_devmap_table[i]); 6899 } 6900 6901 return (NULL); 6902 } 6903 6904 /********************** PTE initialization routines **************************/ 6905 6906 /* 6907 * These routines are called when the CPU type is identified to set up 6908 * the PTE prototypes, cache modes, etc. 6909 * 6910 * The variables are always here, just in case modules need to reference 6911 * them (though, they shouldn't). 6912 */ 6913 6914 pt_entry_t pte_l1_s_cache_mode; 6915 pt_entry_t pte_l1_s_wc_mode; 6916 pt_entry_t pte_l1_s_cache_mode_pt; 6917 pt_entry_t pte_l1_s_cache_mask; 6918 6919 pt_entry_t pte_l2_l_cache_mode; 6920 pt_entry_t pte_l2_l_wc_mode; 6921 pt_entry_t pte_l2_l_cache_mode_pt; 6922 pt_entry_t pte_l2_l_cache_mask; 6923 6924 pt_entry_t pte_l2_s_cache_mode; 6925 pt_entry_t pte_l2_s_wc_mode; 6926 pt_entry_t pte_l2_s_cache_mode_pt; 6927 pt_entry_t pte_l2_s_cache_mask; 6928 6929 pt_entry_t pte_l1_s_prot_u; 6930 pt_entry_t pte_l1_s_prot_w; 6931 pt_entry_t pte_l1_s_prot_ro; 6932 pt_entry_t pte_l1_s_prot_mask; 6933 6934 pt_entry_t pte_l2_s_prot_u; 6935 pt_entry_t pte_l2_s_prot_w; 6936 pt_entry_t pte_l2_s_prot_ro; 6937 pt_entry_t pte_l2_s_prot_mask; 6938 6939 pt_entry_t pte_l2_l_prot_u; 6940 pt_entry_t pte_l2_l_prot_w; 6941 pt_entry_t pte_l2_l_prot_ro; 6942 pt_entry_t pte_l2_l_prot_mask; 6943 6944 pt_entry_t pte_l1_ss_proto; 6945 pt_entry_t pte_l1_s_proto; 6946 pt_entry_t pte_l1_c_proto; 6947 pt_entry_t pte_l2_s_proto; 6948 6949 void (*pmap_copy_page_func)(paddr_t, paddr_t); 6950 void (*pmap_zero_page_func)(paddr_t); 6951 6952 #if (ARM_MMU_GENERIC + ARM_MMU_SA1 + ARM_MMU_V6 + ARM_MMU_V7) != 0 6953 void 6954 pmap_pte_init_generic(void) 6955 { 6956 6957 pte_l1_s_cache_mode = L1_S_B|L1_S_C; 6958 pte_l1_s_wc_mode = L1_S_B; 6959 pte_l1_s_cache_mask = L1_S_CACHE_MASK_generic; 6960 6961 pte_l2_l_cache_mode = L2_B|L2_C; 6962 pte_l2_l_wc_mode = L2_B; 6963 pte_l2_l_cache_mask = L2_L_CACHE_MASK_generic; 6964 6965 pte_l2_s_cache_mode = L2_B|L2_C; 6966 pte_l2_s_wc_mode = L2_B; 6967 pte_l2_s_cache_mask = L2_S_CACHE_MASK_generic; 6968 6969 /* 6970 * If we have a write-through cache, set B and C. If 6971 * we have a write-back cache, then we assume setting 6972 * only C will make those pages write-through (except for those 6973 * Cortex CPUs which can read the L1 caches). 6974 */ 6975 if (cpufuncs.cf_dcache_wb_range == (void *) cpufunc_nullop 6976 #if ARM_MMU_V7 > 0 6977 || CPU_ID_CORTEX_P(curcpu()->ci_arm_cpuid) 6978 #endif 6979 #if ARM_MMU_V6 > 0 6980 || CPU_ID_ARM11_P(curcpu()->ci_arm_cpuid) /* arm116 errata 399234 */ 6981 #endif 6982 || false) { 6983 pte_l1_s_cache_mode_pt = L1_S_B|L1_S_C; 6984 pte_l2_l_cache_mode_pt = L2_B|L2_C; 6985 pte_l2_s_cache_mode_pt = L2_B|L2_C; 6986 } else { 6987 pte_l1_s_cache_mode_pt = L1_S_C; /* write through */ 6988 pte_l2_l_cache_mode_pt = L2_C; /* write through */ 6989 pte_l2_s_cache_mode_pt = L2_C; /* write through */ 6990 } 6991 6992 pte_l1_s_prot_u = L1_S_PROT_U_generic; 6993 pte_l1_s_prot_w = L1_S_PROT_W_generic; 6994 pte_l1_s_prot_ro = L1_S_PROT_RO_generic; 6995 pte_l1_s_prot_mask = L1_S_PROT_MASK_generic; 6996 6997 pte_l2_s_prot_u = L2_S_PROT_U_generic; 6998 pte_l2_s_prot_w = L2_S_PROT_W_generic; 6999 pte_l2_s_prot_ro = L2_S_PROT_RO_generic; 7000 pte_l2_s_prot_mask = L2_S_PROT_MASK_generic; 7001 7002 pte_l2_l_prot_u = L2_L_PROT_U_generic; 7003 pte_l2_l_prot_w = L2_L_PROT_W_generic; 7004 pte_l2_l_prot_ro = L2_L_PROT_RO_generic; 7005 pte_l2_l_prot_mask = L2_L_PROT_MASK_generic; 7006 7007 pte_l1_ss_proto = L1_SS_PROTO_generic; 7008 pte_l1_s_proto = L1_S_PROTO_generic; 7009 pte_l1_c_proto = L1_C_PROTO_generic; 7010 pte_l2_s_proto = L2_S_PROTO_generic; 7011 7012 pmap_copy_page_func = pmap_copy_page_generic; 7013 pmap_zero_page_func = pmap_zero_page_generic; 7014 } 7015 7016 #if defined(CPU_ARM8) 7017 void 7018 pmap_pte_init_arm8(void) 7019 { 7020 7021 /* 7022 * ARM8 is compatible with generic, but we need to use 7023 * the page tables uncached. 7024 */ 7025 pmap_pte_init_generic(); 7026 7027 pte_l1_s_cache_mode_pt = 0; 7028 pte_l2_l_cache_mode_pt = 0; 7029 pte_l2_s_cache_mode_pt = 0; 7030 } 7031 #endif /* CPU_ARM8 */ 7032 7033 #if defined(CPU_ARM9) && defined(ARM9_CACHE_WRITE_THROUGH) 7034 void 7035 pmap_pte_init_arm9(void) 7036 { 7037 7038 /* 7039 * ARM9 is compatible with generic, but we want to use 7040 * write-through caching for now. 7041 */ 7042 pmap_pte_init_generic(); 7043 7044 pte_l1_s_cache_mode = L1_S_C; 7045 pte_l2_l_cache_mode = L2_C; 7046 pte_l2_s_cache_mode = L2_C; 7047 7048 pte_l1_s_wc_mode = L1_S_B; 7049 pte_l2_l_wc_mode = L2_B; 7050 pte_l2_s_wc_mode = L2_B; 7051 7052 pte_l1_s_cache_mode_pt = L1_S_C; 7053 pte_l2_l_cache_mode_pt = L2_C; 7054 pte_l2_s_cache_mode_pt = L2_C; 7055 } 7056 #endif /* CPU_ARM9 && ARM9_CACHE_WRITE_THROUGH */ 7057 #endif /* (ARM_MMU_GENERIC + ARM_MMU_SA1 + ARM_MMU_V6) != 0 */ 7058 7059 #if defined(CPU_ARM10) 7060 void 7061 pmap_pte_init_arm10(void) 7062 { 7063 7064 /* 7065 * ARM10 is compatible with generic, but we want to use 7066 * write-through caching for now. 7067 */ 7068 pmap_pte_init_generic(); 7069 7070 pte_l1_s_cache_mode = L1_S_B | L1_S_C; 7071 pte_l2_l_cache_mode = L2_B | L2_C; 7072 pte_l2_s_cache_mode = L2_B | L2_C; 7073 7074 pte_l1_s_cache_mode = L1_S_B; 7075 pte_l2_l_cache_mode = L2_B; 7076 pte_l2_s_cache_mode = L2_B; 7077 7078 pte_l1_s_cache_mode_pt = L1_S_C; 7079 pte_l2_l_cache_mode_pt = L2_C; 7080 pte_l2_s_cache_mode_pt = L2_C; 7081 7082 } 7083 #endif /* CPU_ARM10 */ 7084 7085 #if defined(CPU_ARM11) && defined(ARM11_CACHE_WRITE_THROUGH) 7086 void 7087 pmap_pte_init_arm11(void) 7088 { 7089 7090 /* 7091 * ARM11 is compatible with generic, but we want to use 7092 * write-through caching for now. 7093 */ 7094 pmap_pte_init_generic(); 7095 7096 pte_l1_s_cache_mode = L1_S_C; 7097 pte_l2_l_cache_mode = L2_C; 7098 pte_l2_s_cache_mode = L2_C; 7099 7100 pte_l1_s_wc_mode = L1_S_B; 7101 pte_l2_l_wc_mode = L2_B; 7102 pte_l2_s_wc_mode = L2_B; 7103 7104 pte_l1_s_cache_mode_pt = L1_S_C; 7105 pte_l2_l_cache_mode_pt = L2_C; 7106 pte_l2_s_cache_mode_pt = L2_C; 7107 } 7108 #endif /* CPU_ARM11 && ARM11_CACHE_WRITE_THROUGH */ 7109 7110 #if ARM_MMU_SA1 == 1 7111 void 7112 pmap_pte_init_sa1(void) 7113 { 7114 7115 /* 7116 * The StrongARM SA-1 cache does not have a write-through 7117 * mode. So, do the generic initialization, then reset 7118 * the page table cache mode to B=1,C=1, and note that 7119 * the PTEs need to be sync'd. 7120 */ 7121 pmap_pte_init_generic(); 7122 7123 pte_l1_s_cache_mode_pt = L1_S_B|L1_S_C; 7124 pte_l2_l_cache_mode_pt = L2_B|L2_C; 7125 pte_l2_s_cache_mode_pt = L2_B|L2_C; 7126 7127 pmap_needs_pte_sync = 1; 7128 } 7129 #endif /* ARM_MMU_SA1 == 1*/ 7130 7131 #if ARM_MMU_XSCALE == 1 7132 #if (ARM_NMMUS > 1) 7133 static u_int xscale_use_minidata; 7134 #endif 7135 7136 void 7137 pmap_pte_init_xscale(void) 7138 { 7139 uint32_t auxctl; 7140 int write_through = 0; 7141 7142 pte_l1_s_cache_mode = L1_S_B|L1_S_C; 7143 pte_l1_s_wc_mode = L1_S_B; 7144 pte_l1_s_cache_mask = L1_S_CACHE_MASK_xscale; 7145 7146 pte_l2_l_cache_mode = L2_B|L2_C; 7147 pte_l2_l_wc_mode = L2_B; 7148 pte_l2_l_cache_mask = L2_L_CACHE_MASK_xscale; 7149 7150 pte_l2_s_cache_mode = L2_B|L2_C; 7151 pte_l2_s_wc_mode = L2_B; 7152 pte_l2_s_cache_mask = L2_S_CACHE_MASK_xscale; 7153 7154 pte_l1_s_cache_mode_pt = L1_S_C; 7155 pte_l2_l_cache_mode_pt = L2_C; 7156 pte_l2_s_cache_mode_pt = L2_C; 7157 7158 #ifdef XSCALE_CACHE_READ_WRITE_ALLOCATE 7159 /* 7160 * The XScale core has an enhanced mode where writes that 7161 * miss the cache cause a cache line to be allocated. This 7162 * is significantly faster than the traditional, write-through 7163 * behavior of this case. 7164 */ 7165 pte_l1_s_cache_mode |= L1_S_XS_TEX(TEX_XSCALE_X); 7166 pte_l2_l_cache_mode |= L2_XS_L_TEX(TEX_XSCALE_X); 7167 pte_l2_s_cache_mode |= L2_XS_T_TEX(TEX_XSCALE_X); 7168 #endif /* XSCALE_CACHE_READ_WRITE_ALLOCATE */ 7169 7170 #ifdef XSCALE_CACHE_WRITE_THROUGH 7171 /* 7172 * Some versions of the XScale core have various bugs in 7173 * their cache units, the work-around for which is to run 7174 * the cache in write-through mode. Unfortunately, this 7175 * has a major (negative) impact on performance. So, we 7176 * go ahead and run fast-and-loose, in the hopes that we 7177 * don't line up the planets in a way that will trip the 7178 * bugs. 7179 * 7180 * However, we give you the option to be slow-but-correct. 7181 */ 7182 write_through = 1; 7183 #elif defined(XSCALE_CACHE_WRITE_BACK) 7184 /* force write back cache mode */ 7185 write_through = 0; 7186 #elif defined(CPU_XSCALE_PXA250) || defined(CPU_XSCALE_PXA270) 7187 /* 7188 * Intel PXA2[15]0 processors are known to have a bug in 7189 * write-back cache on revision 4 and earlier (stepping 7190 * A[01] and B[012]). Fixed for C0 and later. 7191 */ 7192 { 7193 uint32_t id, type; 7194 7195 id = cpufunc_id(); 7196 type = id & ~(CPU_ID_XSCALE_COREREV_MASK|CPU_ID_REVISION_MASK); 7197 7198 if (type == CPU_ID_PXA250 || type == CPU_ID_PXA210) { 7199 if ((id & CPU_ID_REVISION_MASK) < 5) { 7200 /* write through for stepping A0-1 and B0-2 */ 7201 write_through = 1; 7202 } 7203 } 7204 } 7205 #endif /* XSCALE_CACHE_WRITE_THROUGH */ 7206 7207 if (write_through) { 7208 pte_l1_s_cache_mode = L1_S_C; 7209 pte_l2_l_cache_mode = L2_C; 7210 pte_l2_s_cache_mode = L2_C; 7211 } 7212 7213 #if (ARM_NMMUS > 1) 7214 xscale_use_minidata = 1; 7215 #endif 7216 7217 pte_l1_s_prot_u = L1_S_PROT_U_xscale; 7218 pte_l1_s_prot_w = L1_S_PROT_W_xscale; 7219 pte_l1_s_prot_ro = L1_S_PROT_RO_xscale; 7220 pte_l1_s_prot_mask = L1_S_PROT_MASK_xscale; 7221 7222 pte_l2_s_prot_u = L2_S_PROT_U_xscale; 7223 pte_l2_s_prot_w = L2_S_PROT_W_xscale; 7224 pte_l2_s_prot_ro = L2_S_PROT_RO_xscale; 7225 pte_l2_s_prot_mask = L2_S_PROT_MASK_xscale; 7226 7227 pte_l2_l_prot_u = L2_L_PROT_U_xscale; 7228 pte_l2_l_prot_w = L2_L_PROT_W_xscale; 7229 pte_l2_l_prot_ro = L2_L_PROT_RO_xscale; 7230 pte_l2_l_prot_mask = L2_L_PROT_MASK_xscale; 7231 7232 pte_l1_ss_proto = L1_SS_PROTO_xscale; 7233 pte_l1_s_proto = L1_S_PROTO_xscale; 7234 pte_l1_c_proto = L1_C_PROTO_xscale; 7235 pte_l2_s_proto = L2_S_PROTO_xscale; 7236 7237 pmap_copy_page_func = pmap_copy_page_xscale; 7238 pmap_zero_page_func = pmap_zero_page_xscale; 7239 7240 /* 7241 * Disable ECC protection of page table access, for now. 7242 */ 7243 auxctl = armreg_auxctl_read(); 7244 auxctl &= ~XSCALE_AUXCTL_P; 7245 armreg_auxctl_write(auxctl); 7246 } 7247 7248 /* 7249 * xscale_setup_minidata: 7250 * 7251 * Set up the mini-data cache clean area. We require the 7252 * caller to allocate the right amount of physically and 7253 * virtually contiguous space. 7254 */ 7255 void 7256 xscale_setup_minidata(vaddr_t l1pt, vaddr_t va, paddr_t pa) 7257 { 7258 extern vaddr_t xscale_minidata_clean_addr; 7259 extern vsize_t xscale_minidata_clean_size; /* already initialized */ 7260 pd_entry_t *pde = (pd_entry_t *) l1pt; 7261 vsize_t size; 7262 uint32_t auxctl; 7263 7264 xscale_minidata_clean_addr = va; 7265 7266 /* Round it to page size. */ 7267 size = (xscale_minidata_clean_size + L2_S_OFFSET) & L2_S_FRAME; 7268 7269 for (; size != 0; 7270 va += L2_S_SIZE, pa += L2_S_SIZE, size -= L2_S_SIZE) { 7271 const size_t l1slot = l1pte_index(va); 7272 pt_entry_t *ptep = (pt_entry_t *) kernel_pt_lookup(l1pte_pa(pde[l1slot])); 7273 if (ptep == NULL) 7274 panic("xscale_setup_minidata: can't find L2 table for " 7275 "VA 0x%08lx", va); 7276 7277 ptep += l2pte_index(va); 7278 pt_entry_t opte = *ptep; 7279 l2pte_set(ptep, 7280 L2_S_PROTO | pa | L2_S_PROT(PTE_KERNEL, VM_PROT_READ) 7281 | L2_C | L2_XS_T_TEX(TEX_XSCALE_X), opte); 7282 } 7283 7284 /* 7285 * Configure the mini-data cache for write-back with 7286 * read/write-allocate. 7287 * 7288 * NOTE: In order to reconfigure the mini-data cache, we must 7289 * make sure it contains no valid data! In order to do that, 7290 * we must issue a global data cache invalidate command! 7291 * 7292 * WE ASSUME WE ARE RUNNING UN-CACHED WHEN THIS ROUTINE IS CALLED! 7293 * THIS IS VERY IMPORTANT! 7294 */ 7295 7296 /* Invalidate data and mini-data. */ 7297 __asm volatile("mcr p15, 0, %0, c7, c6, 0" : : "r" (0)); 7298 auxctl = armreg_auxctl_read(); 7299 auxctl = (auxctl & ~XSCALE_AUXCTL_MD_MASK) | XSCALE_AUXCTL_MD_WB_RWA; 7300 armreg_auxctl_write(auxctl); 7301 } 7302 7303 /* 7304 * Change the PTEs for the specified kernel mappings such that they 7305 * will use the mini data cache instead of the main data cache. 7306 */ 7307 void 7308 pmap_uarea(vaddr_t va) 7309 { 7310 vaddr_t next_bucket, eva; 7311 7312 #if (ARM_NMMUS > 1) 7313 if (xscale_use_minidata == 0) 7314 return; 7315 #endif 7316 7317 eva = va + USPACE; 7318 7319 while (va < eva) { 7320 next_bucket = L2_NEXT_BUCKET_VA(va); 7321 if (next_bucket > eva) 7322 next_bucket = eva; 7323 7324 struct l2_bucket *l2b = pmap_get_l2_bucket(pmap_kernel(), va); 7325 KDASSERT(l2b != NULL); 7326 7327 pt_entry_t * const sptep = &l2b->l2b_kva[l2pte_index(va)]; 7328 pt_entry_t *ptep = sptep; 7329 7330 while (va < next_bucket) { 7331 const pt_entry_t opte = *ptep; 7332 if (!l2pte_minidata_p(opte)) { 7333 cpu_dcache_wbinv_range(va, PAGE_SIZE); 7334 cpu_tlb_flushD_SE(va); 7335 l2pte_set(ptep, opte & ~L2_B, opte); 7336 } 7337 ptep += PAGE_SIZE / L2_S_SIZE; 7338 va += PAGE_SIZE; 7339 } 7340 PTE_SYNC_RANGE(sptep, (u_int)(ptep - sptep)); 7341 } 7342 cpu_cpwait(); 7343 } 7344 #endif /* ARM_MMU_XSCALE == 1 */ 7345 7346 7347 #if defined(CPU_ARM11MPCORE) 7348 7349 void 7350 pmap_pte_init_arm11mpcore(void) 7351 { 7352 7353 /* cache mode is controlled by 5 bits (B, C, TEX) */ 7354 pte_l1_s_cache_mask = L1_S_CACHE_MASK_armv6; 7355 pte_l2_l_cache_mask = L2_L_CACHE_MASK_armv6; 7356 #if defined(ARM11MPCORE_COMPAT_MMU) || defined(ARMV6_EXTENDED_SMALL_PAGE) 7357 /* use extended small page (without APn, with TEX) */ 7358 pte_l2_s_cache_mask = L2_XS_CACHE_MASK_armv6; 7359 #else 7360 pte_l2_s_cache_mask = L2_S_CACHE_MASK_armv6c; 7361 #endif 7362 7363 /* write-back, write-allocate */ 7364 pte_l1_s_cache_mode = L1_S_C | L1_S_B | L1_S_V6_TEX(0x01); 7365 pte_l2_l_cache_mode = L2_C | L2_B | L2_V6_L_TEX(0x01); 7366 #if defined(ARM11MPCORE_COMPAT_MMU) || defined(ARMV6_EXTENDED_SMALL_PAGE) 7367 pte_l2_s_cache_mode = L2_C | L2_B | L2_V6_XS_TEX(0x01); 7368 #else 7369 /* no TEX. read-allocate */ 7370 pte_l2_s_cache_mode = L2_C | L2_B; 7371 #endif 7372 /* 7373 * write-back, write-allocate for page tables. 7374 */ 7375 pte_l1_s_cache_mode_pt = L1_S_C | L1_S_B | L1_S_V6_TEX(0x01); 7376 pte_l2_l_cache_mode_pt = L2_C | L2_B | L2_V6_L_TEX(0x01); 7377 #if defined(ARM11MPCORE_COMPAT_MMU) || defined(ARMV6_EXTENDED_SMALL_PAGE) 7378 pte_l2_s_cache_mode_pt = L2_C | L2_B | L2_V6_XS_TEX(0x01); 7379 #else 7380 pte_l2_s_cache_mode_pt = L2_C | L2_B; 7381 #endif 7382 7383 pte_l1_s_prot_u = L1_S_PROT_U_armv6; 7384 pte_l1_s_prot_w = L1_S_PROT_W_armv6; 7385 pte_l1_s_prot_ro = L1_S_PROT_RO_armv6; 7386 pte_l1_s_prot_mask = L1_S_PROT_MASK_armv6; 7387 7388 #if defined(ARM11MPCORE_COMPAT_MMU) || defined(ARMV6_EXTENDED_SMALL_PAGE) 7389 pte_l2_s_prot_u = L2_S_PROT_U_armv6n; 7390 pte_l2_s_prot_w = L2_S_PROT_W_armv6n; 7391 pte_l2_s_prot_ro = L2_S_PROT_RO_armv6n; 7392 pte_l2_s_prot_mask = L2_S_PROT_MASK_armv6n; 7393 7394 #else 7395 /* with AP[0..3] */ 7396 pte_l2_s_prot_u = L2_S_PROT_U_generic; 7397 pte_l2_s_prot_w = L2_S_PROT_W_generic; 7398 pte_l2_s_prot_ro = L2_S_PROT_RO_generic; 7399 pte_l2_s_prot_mask = L2_S_PROT_MASK_generic; 7400 #endif 7401 7402 #ifdef ARM11MPCORE_COMPAT_MMU 7403 /* with AP[0..3] */ 7404 pte_l2_l_prot_u = L2_L_PROT_U_generic; 7405 pte_l2_l_prot_w = L2_L_PROT_W_generic; 7406 pte_l2_l_prot_ro = L2_L_PROT_RO_generic; 7407 pte_l2_l_prot_mask = L2_L_PROT_MASK_generic; 7408 7409 pte_l1_ss_proto = L1_SS_PROTO_armv6; 7410 pte_l1_s_proto = L1_S_PROTO_armv6; 7411 pte_l1_c_proto = L1_C_PROTO_armv6; 7412 pte_l2_s_proto = L2_S_PROTO_armv6c; 7413 #else 7414 pte_l2_l_prot_u = L2_L_PROT_U_armv6n; 7415 pte_l2_l_prot_w = L2_L_PROT_W_armv6n; 7416 pte_l2_l_prot_ro = L2_L_PROT_RO_armv6n; 7417 pte_l2_l_prot_mask = L2_L_PROT_MASK_armv6n; 7418 7419 pte_l1_ss_proto = L1_SS_PROTO_armv6; 7420 pte_l1_s_proto = L1_S_PROTO_armv6; 7421 pte_l1_c_proto = L1_C_PROTO_armv6; 7422 pte_l2_s_proto = L2_S_PROTO_armv6n; 7423 #endif 7424 7425 pmap_copy_page_func = pmap_copy_page_generic; 7426 pmap_zero_page_func = pmap_zero_page_generic; 7427 pmap_needs_pte_sync = 1; 7428 } 7429 #endif /* CPU_ARM11MPCORE */ 7430 7431 7432 #if ARM_MMU_V7 == 1 7433 void 7434 pmap_pte_init_armv7(void) 7435 { 7436 /* 7437 * The ARMv7-A MMU is mostly compatible with generic. If the 7438 * AP field is zero, that now means "no access" rather than 7439 * read-only. The prototypes are a little different because of 7440 * the XN bit. 7441 */ 7442 pmap_pte_init_generic(); 7443 7444 pmap_needs_pte_sync = 1; 7445 7446 pte_l1_s_cache_mask = L1_S_CACHE_MASK_armv7; 7447 pte_l2_l_cache_mask = L2_L_CACHE_MASK_armv7; 7448 pte_l2_s_cache_mask = L2_S_CACHE_MASK_armv7; 7449 7450 /* 7451 * If the core support coherent walk then updates to translation tables 7452 * do not require a clean to the point of unification to ensure 7453 * visibility by subsequent translation table walks. That means we can 7454 * map everything shareable and cached and the right thing will happen. 7455 */ 7456 if (__SHIFTOUT(armreg_mmfr3_read(), __BITS(23,20))) { 7457 pmap_needs_pte_sync = 0; 7458 7459 /* 7460 * write-back, no write-allocate, shareable for normal pages. 7461 */ 7462 pte_l1_s_cache_mode |= L1_S_V6_S; 7463 pte_l2_l_cache_mode |= L2_XS_S; 7464 pte_l2_s_cache_mode |= L2_XS_S; 7465 } 7466 7467 /* 7468 * Page tables are just all other memory. We can use write-back since 7469 * pmap_needs_pte_sync is 1 (or the MMU can read out of cache). 7470 */ 7471 pte_l1_s_cache_mode_pt = pte_l1_s_cache_mode; 7472 pte_l2_l_cache_mode_pt = pte_l2_l_cache_mode; 7473 pte_l2_s_cache_mode_pt = pte_l2_s_cache_mode; 7474 7475 /* 7476 * Check the Memory Model Features to see if this CPU supports 7477 * the TLBIASID coproc op. 7478 */ 7479 if (__SHIFTOUT(armreg_mmfr2_read(), __BITS(16,19)) >= 2) { 7480 arm_has_tlbiasid_p = true; 7481 } 7482 7483 pte_l1_s_prot_u = L1_S_PROT_U_armv7; 7484 pte_l1_s_prot_w = L1_S_PROT_W_armv7; 7485 pte_l1_s_prot_ro = L1_S_PROT_RO_armv7; 7486 pte_l1_s_prot_mask = L1_S_PROT_MASK_armv7; 7487 7488 pte_l2_s_prot_u = L2_S_PROT_U_armv7; 7489 pte_l2_s_prot_w = L2_S_PROT_W_armv7; 7490 pte_l2_s_prot_ro = L2_S_PROT_RO_armv7; 7491 pte_l2_s_prot_mask = L2_S_PROT_MASK_armv7; 7492 7493 pte_l2_l_prot_u = L2_L_PROT_U_armv7; 7494 pte_l2_l_prot_w = L2_L_PROT_W_armv7; 7495 pte_l2_l_prot_ro = L2_L_PROT_RO_armv7; 7496 pte_l2_l_prot_mask = L2_L_PROT_MASK_armv7; 7497 7498 pte_l1_ss_proto = L1_SS_PROTO_armv7; 7499 pte_l1_s_proto = L1_S_PROTO_armv7; 7500 pte_l1_c_proto = L1_C_PROTO_armv7; 7501 pte_l2_s_proto = L2_S_PROTO_armv7; 7502 7503 } 7504 #endif /* ARM_MMU_V7 */ 7505 7506 /* 7507 * return the PA of the current L1 table, for use when handling a crash dump 7508 */ 7509 uint32_t 7510 pmap_kernel_L1_addr(void) 7511 { 7512 #ifdef ARM_MMU_EXTENDED 7513 return pmap_kernel()->pm_l1_pa; 7514 #else 7515 return pmap_kernel()->pm_l1->l1_physaddr; 7516 #endif 7517 } 7518 7519 #if defined(DDB) 7520 /* 7521 * A couple of ddb-callable functions for dumping pmaps 7522 */ 7523 void pmap_dump(pmap_t); 7524 7525 static pt_entry_t ncptes[64]; 7526 static void pmap_dump_ncpg(pmap_t); 7527 7528 void 7529 pmap_dump(pmap_t pm) 7530 { 7531 struct l2_dtable *l2; 7532 struct l2_bucket *l2b; 7533 pt_entry_t *ptep, pte; 7534 vaddr_t l2_va, l2b_va, va; 7535 int i, j, k, occ, rows = 0; 7536 7537 if (pm == pmap_kernel()) 7538 printf("pmap_kernel (%p): ", pm); 7539 else 7540 printf("user pmap (%p): ", pm); 7541 7542 #ifdef ARM_MMU_EXTENDED 7543 printf("l1 at %p\n", pmap_l1_kva(pm)); 7544 #else 7545 printf("domain %d, l1 at %p\n", pmap_domain(pm), pmap_l1_kva(pm)); 7546 #endif 7547 7548 l2_va = 0; 7549 for (i = 0; i < L2_SIZE; i++, l2_va += 0x01000000) { 7550 l2 = pm->pm_l2[i]; 7551 7552 if (l2 == NULL || l2->l2_occupancy == 0) 7553 continue; 7554 7555 l2b_va = l2_va; 7556 for (j = 0; j < L2_BUCKET_SIZE; j++, l2b_va += 0x00100000) { 7557 l2b = &l2->l2_bucket[j]; 7558 7559 if (l2b->l2b_occupancy == 0 || l2b->l2b_kva == NULL) 7560 continue; 7561 7562 ptep = l2b->l2b_kva; 7563 7564 for (k = 0; k < 256 && ptep[k] == 0; k++) 7565 ; 7566 7567 k &= ~63; 7568 occ = l2b->l2b_occupancy; 7569 va = l2b_va + (k * 4096); 7570 for (; k < 256; k++, va += 0x1000) { 7571 char ch = ' '; 7572 if ((k % 64) == 0) { 7573 if ((rows % 8) == 0) { 7574 printf( 7575 " |0000 |8000 |10000 |18000 |20000 |28000 |30000 |38000\n"); 7576 } 7577 printf("%08lx: ", va); 7578 } 7579 7580 ncptes[k & 63] = 0; 7581 pte = ptep[k]; 7582 if (pte == 0) { 7583 ch = '.'; 7584 } else { 7585 occ--; 7586 switch (pte & 0x0c) { 7587 case 0x00: 7588 ch = 'D'; /* No cache No buff */ 7589 break; 7590 case 0x04: 7591 ch = 'B'; /* No cache buff */ 7592 break; 7593 case 0x08: 7594 if (pte & 0x40) 7595 ch = 'm'; 7596 else 7597 ch = 'C'; /* Cache No buff */ 7598 break; 7599 case 0x0c: 7600 ch = 'F'; /* Cache Buff */ 7601 break; 7602 } 7603 7604 if ((pte & L2_S_PROT_U) == L2_S_PROT_U) 7605 ch += 0x20; 7606 7607 if ((pte & 0xc) == 0) 7608 ncptes[k & 63] = pte; 7609 } 7610 7611 if ((k % 64) == 63) { 7612 rows++; 7613 printf("%c\n", ch); 7614 pmap_dump_ncpg(pm); 7615 if (occ == 0) 7616 break; 7617 } else 7618 printf("%c", ch); 7619 } 7620 } 7621 } 7622 } 7623 7624 static void 7625 pmap_dump_ncpg(pmap_t pm) 7626 { 7627 struct vm_page *pg; 7628 struct vm_page_md *md; 7629 struct pv_entry *pv; 7630 int i; 7631 7632 for (i = 0; i < 63; i++) { 7633 if (ncptes[i] == 0) 7634 continue; 7635 7636 pg = PHYS_TO_VM_PAGE(l2pte_pa(ncptes[i])); 7637 if (pg == NULL) 7638 continue; 7639 md = VM_PAGE_TO_MD(pg); 7640 7641 printf(" pa 0x%08lx: krw %d kro %d urw %d uro %d\n", 7642 VM_PAGE_TO_PHYS(pg), 7643 md->krw_mappings, md->kro_mappings, 7644 md->urw_mappings, md->uro_mappings); 7645 7646 SLIST_FOREACH(pv, &md->pvh_list, pv_link) { 7647 printf(" %c va 0x%08lx, flags 0x%x\n", 7648 (pm == pv->pv_pmap) ? '*' : ' ', 7649 pv->pv_va, pv->pv_flags); 7650 } 7651 } 7652 } 7653 #endif 7654 7655 #ifdef PMAP_STEAL_MEMORY 7656 void 7657 pmap_boot_pageadd(pv_addr_t *newpv) 7658 { 7659 pv_addr_t *pv, *npv; 7660 7661 if ((pv = SLIST_FIRST(&pmap_boot_freeq)) != NULL) { 7662 if (newpv->pv_pa < pv->pv_va) { 7663 KASSERT(newpv->pv_pa + newpv->pv_size <= pv->pv_pa); 7664 if (newpv->pv_pa + newpv->pv_size == pv->pv_pa) { 7665 newpv->pv_size += pv->pv_size; 7666 SLIST_REMOVE_HEAD(&pmap_boot_freeq, pv_list); 7667 } 7668 pv = NULL; 7669 } else { 7670 for (; (npv = SLIST_NEXT(pv, pv_list)) != NULL; 7671 pv = npv) { 7672 KASSERT(pv->pv_pa + pv->pv_size < npv->pv_pa); 7673 KASSERT(pv->pv_pa < newpv->pv_pa); 7674 if (newpv->pv_pa > npv->pv_pa) 7675 continue; 7676 if (pv->pv_pa + pv->pv_size == newpv->pv_pa) { 7677 pv->pv_size += newpv->pv_size; 7678 return; 7679 } 7680 if (newpv->pv_pa + newpv->pv_size < npv->pv_pa) 7681 break; 7682 newpv->pv_size += npv->pv_size; 7683 SLIST_INSERT_AFTER(pv, newpv, pv_list); 7684 SLIST_REMOVE_AFTER(newpv, pv_list); 7685 return; 7686 } 7687 } 7688 } 7689 7690 if (pv) { 7691 SLIST_INSERT_AFTER(pv, newpv, pv_list); 7692 } else { 7693 SLIST_INSERT_HEAD(&pmap_boot_freeq, newpv, pv_list); 7694 } 7695 } 7696 7697 void 7698 pmap_boot_pagealloc(psize_t amount, psize_t mask, psize_t match, 7699 pv_addr_t *rpv) 7700 { 7701 pv_addr_t *pv, **pvp; 7702 struct vm_physseg *ps; 7703 size_t i; 7704 7705 KASSERT(amount & PGOFSET); 7706 KASSERT((mask & PGOFSET) == 0); 7707 KASSERT((match & PGOFSET) == 0); 7708 KASSERT(amount != 0); 7709 7710 for (pvp = &SLIST_FIRST(&pmap_boot_freeq); 7711 (pv = *pvp) != NULL; 7712 pvp = &SLIST_NEXT(pv, pv_list)) { 7713 pv_addr_t *newpv; 7714 psize_t off; 7715 /* 7716 * If this entry is too small to satify the request... 7717 */ 7718 KASSERT(pv->pv_size > 0); 7719 if (pv->pv_size < amount) 7720 continue; 7721 7722 for (off = 0; off <= mask; off += PAGE_SIZE) { 7723 if (((pv->pv_pa + off) & mask) == match 7724 && off + amount <= pv->pv_size) 7725 break; 7726 } 7727 if (off > mask) 7728 continue; 7729 7730 rpv->pv_va = pv->pv_va + off; 7731 rpv->pv_pa = pv->pv_pa + off; 7732 rpv->pv_size = amount; 7733 pv->pv_size -= amount; 7734 if (pv->pv_size == 0) { 7735 KASSERT(off == 0); 7736 KASSERT((vaddr_t) pv == rpv->pv_va); 7737 *pvp = SLIST_NEXT(pv, pv_list); 7738 } else if (off == 0) { 7739 KASSERT((vaddr_t) pv == rpv->pv_va); 7740 newpv = (pv_addr_t *) (rpv->pv_va + amount); 7741 *newpv = *pv; 7742 newpv->pv_pa += amount; 7743 newpv->pv_va += amount; 7744 *pvp = newpv; 7745 } else if (off < pv->pv_size) { 7746 newpv = (pv_addr_t *) (rpv->pv_va + amount); 7747 *newpv = *pv; 7748 newpv->pv_size -= off; 7749 newpv->pv_pa += off + amount; 7750 newpv->pv_va += off + amount; 7751 7752 SLIST_NEXT(pv, pv_list) = newpv; 7753 pv->pv_size = off; 7754 } else { 7755 KASSERT((vaddr_t) pv != rpv->pv_va); 7756 } 7757 memset((void *)rpv->pv_va, 0, amount); 7758 return; 7759 } 7760 7761 if (vm_nphysseg == 0) 7762 panic("pmap_boot_pagealloc: couldn't allocate memory"); 7763 7764 for (pvp = &SLIST_FIRST(&pmap_boot_freeq); 7765 (pv = *pvp) != NULL; 7766 pvp = &SLIST_NEXT(pv, pv_list)) { 7767 if (SLIST_NEXT(pv, pv_list) == NULL) 7768 break; 7769 } 7770 KASSERT(mask == 0); 7771 for (i = 0; i < vm_nphysseg; i++) { 7772 ps = VM_PHYSMEM_PTR(i); 7773 if (ps->avail_start == atop(pv->pv_pa + pv->pv_size) 7774 && pv->pv_va + pv->pv_size <= ptoa(ps->avail_end)) { 7775 rpv->pv_va = pv->pv_va; 7776 rpv->pv_pa = pv->pv_pa; 7777 rpv->pv_size = amount; 7778 *pvp = NULL; 7779 pmap_map_chunk(kernel_l1pt.pv_va, 7780 ptoa(ps->avail_start) + (pv->pv_va - pv->pv_pa), 7781 ptoa(ps->avail_start), 7782 amount - pv->pv_size, 7783 VM_PROT_READ|VM_PROT_WRITE, 7784 PTE_CACHE); 7785 ps->avail_start += atop(amount - pv->pv_size); 7786 /* 7787 * If we consumed the entire physseg, remove it. 7788 */ 7789 if (ps->avail_start == ps->avail_end) { 7790 for (--vm_nphysseg; i < vm_nphysseg; i++) 7791 VM_PHYSMEM_PTR_SWAP(i, i + 1); 7792 } 7793 memset((void *)rpv->pv_va, 0, rpv->pv_size); 7794 return; 7795 } 7796 } 7797 7798 panic("pmap_boot_pagealloc: couldn't allocate memory"); 7799 } 7800 7801 vaddr_t 7802 pmap_steal_memory(vsize_t size, vaddr_t *vstartp, vaddr_t *vendp) 7803 { 7804 pv_addr_t pv; 7805 7806 pmap_boot_pagealloc(size, 0, 0, &pv); 7807 7808 return pv.pv_va; 7809 } 7810 #endif /* PMAP_STEAL_MEMORY */ 7811 7812 SYSCTL_SETUP(sysctl_machdep_pmap_setup, "sysctl machdep.kmpages setup") 7813 { 7814 sysctl_createv(clog, 0, NULL, NULL, 7815 CTLFLAG_PERMANENT, 7816 CTLTYPE_NODE, "machdep", NULL, 7817 NULL, 0, NULL, 0, 7818 CTL_MACHDEP, CTL_EOL); 7819 7820 sysctl_createv(clog, 0, NULL, NULL, 7821 CTLFLAG_PERMANENT, 7822 CTLTYPE_INT, "kmpages", 7823 SYSCTL_DESCR("count of pages allocated to kernel memory allocators"), 7824 NULL, 0, &pmap_kmpages, 0, 7825 CTL_MACHDEP, CTL_CREATE, CTL_EOL); 7826 } 7827 7828 #ifdef PMAP_NEED_ALLOC_POOLPAGE 7829 struct vm_page * 7830 arm_pmap_alloc_poolpage(int flags) 7831 { 7832 /* 7833 * On some systems, only some pages may be "coherent" for dma and we 7834 * want to prefer those for pool pages (think mbufs) but fallback to 7835 * any page if none is available. But we can only fallback if we 7836 * aren't direct mapping memory or all of memory can be direct-mapped. 7837 * If that isn't true, pool changes can only come from direct-mapped 7838 * memory. 7839 */ 7840 if (arm_poolpage_vmfreelist != VM_FREELIST_DEFAULT) { 7841 return uvm_pagealloc_strat(NULL, 0, NULL, flags, 7842 UVM_PGA_STRAT_FALLBACK, 7843 arm_poolpage_vmfreelist); 7844 } 7845 7846 return uvm_pagealloc(NULL, 0, NULL, flags); 7847 } 7848 #endif 7849 7850 #if defined(ARM_MMU_EXTENDED) && defined(MULTIPROCESSOR) 7851 void 7852 pmap_md_tlb_info_attach(struct pmap_tlb_info *ti, struct cpu_info *ci) 7853 { 7854 /* nothing */ 7855 } 7856 7857 int 7858 pic_ipi_shootdown(void *arg) 7859 { 7860 #if PMAP_NEED_TLB_SHOOTDOWN 7861 pmap_tlb_shootdown_process(); 7862 #endif 7863 return 1; 7864 } 7865 #endif /* ARM_MMU_EXTENDED && MULTIPROCESSOR */ 7866 7867 7868 #ifdef __HAVE_MM_MD_DIRECT_MAPPED_PHYS 7869 vaddr_t 7870 pmap_direct_mapped_phys(paddr_t pa, bool *ok_p, vaddr_t va) 7871 { 7872 bool ok = false; 7873 if (physical_start <= pa && pa < physical_end) { 7874 #ifdef KERNEL_BASE_VOFFSET 7875 const vaddr_t newva = pa + KERNEL_BASE_VOFFSET; 7876 #else 7877 const vaddr_t newva = KERNEL_BASE + pa - physical_start; 7878 #endif 7879 #ifdef ARM_MMU_EXTENDED 7880 if (newva >= KERNEL_BASE && newva < pmap_directlimit) { 7881 #endif 7882 va = newva; 7883 ok = true; 7884 #ifdef ARM_MMU_EXTENDED 7885 } 7886 #endif 7887 } 7888 KASSERT(ok_p); 7889 *ok_p = ok; 7890 return va; 7891 } 7892 7893 vaddr_t 7894 pmap_map_poolpage(paddr_t pa) 7895 { 7896 bool ok __diagused; 7897 vaddr_t va = pmap_direct_mapped_phys(pa, &ok, 0); 7898 KASSERTMSG(ok, "pa %#lx not direct mappable", pa); 7899 #if defined(PMAP_CACHE_VIPT) && !defined(ARM_MMU_EXTENDED) 7900 if (arm_cache_prefer_mask != 0) { 7901 struct vm_page * const pg = PHYS_TO_VM_PAGE(pa); 7902 struct vm_page_md * const md = VM_PAGE_TO_MD(pg); 7903 pmap_acquire_page_lock(md); 7904 pmap_vac_me_harder(md, pa, pmap_kernel(), va); 7905 pmap_release_page_lock(md); 7906 } 7907 #endif 7908 return va; 7909 } 7910 7911 paddr_t 7912 pmap_unmap_poolpage(vaddr_t va) 7913 { 7914 KASSERT(va >= KERNEL_BASE); 7915 #ifdef PMAP_CACHE_VIVT 7916 cpu_idcache_wbinv_range(va, PAGE_SIZE); 7917 #endif 7918 #if defined(KERNEL_BASE_VOFFSET) 7919 return va - KERNEL_BASE_VOFFSET; 7920 #else 7921 return va - KERNEL_BASE + physical_start; 7922 #endif 7923 } 7924 #endif /* __HAVE_MM_MD_DIRECT_MAPPED_PHYS */ 7925
Indexes created Mon Sep 29 21:09:56 GMT 2025