pmap.c revision 1.109
1 /* $NetBSD: pmap.c,v 1.109 2002/08/13 03:36:30 thorpej Exp $ */ 2 3 /* 4 * Copyright (c) 2002 Wasabi Systems, Inc. 5 * Copyright (c) 2001 Richard Earnshaw 6 * Copyright (c) 2001 Christopher Gilbert 7 * All rights reserved. 8 * 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. The name of the company nor the name of the author may be used to 15 * endorse or promote products derived from this software without specific 16 * prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 19 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 20 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 22 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 23 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 /*- 32 * Copyright (c) 1999 The NetBSD Foundation, Inc. 33 * All rights reserved. 34 * 35 * This code is derived from software contributed to The NetBSD Foundation 36 * by Charles M. Hannum. 37 * 38 * Redistribution and use in source and binary forms, with or without 39 * modification, are permitted provided that the following conditions 40 * are met: 41 * 1. Redistributions of source code must retain the above copyright 42 * notice, this list of conditions and the following disclaimer. 43 * 2. Redistributions in binary form must reproduce the above copyright 44 * notice, this list of conditions and the following disclaimer in the 45 * documentation and/or other materials provided with the distribution. 46 * 3. All advertising materials mentioning features or use of this software 47 * must display the following acknowledgement: 48 * This product includes software developed by the NetBSD 49 * Foundation, Inc. and its contributors. 50 * 4. Neither the name of The NetBSD Foundation nor the names of its 51 * contributors may be used to endorse or promote products derived 52 * from this software without specific prior written permission. 53 * 54 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 55 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 56 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 57 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 58 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 59 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 60 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 61 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 62 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 63 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 64 * POSSIBILITY OF SUCH DAMAGE. 65 */ 66 67 /* 68 * Copyright (c) 1994-1998 Mark Brinicombe. 69 * Copyright (c) 1994 Brini. 70 * All rights reserved. 71 * 72 * This code is derived from software written for Brini by Mark Brinicombe 73 * 74 * Redistribution and use in source and binary forms, with or without 75 * modification, are permitted provided that the following conditions 76 * are met: 77 * 1. Redistributions of source code must retain the above copyright 78 * notice, this list of conditions and the following disclaimer. 79 * 2. Redistributions in binary form must reproduce the above copyright 80 * notice, this list of conditions and the following disclaimer in the 81 * documentation and/or other materials provided with the distribution. 82 * 3. All advertising materials mentioning features or use of this software 83 * must display the following acknowledgement: 84 * This product includes software developed by Mark Brinicombe. 85 * 4. The name of the author may not be used to endorse or promote products 86 * derived from this software without specific prior written permission. 87 * 88 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 89 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 90 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 91 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 92 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 93 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 94 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 95 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 96 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 97 * 98 * RiscBSD kernel project 99 * 100 * pmap.c 101 * 102 * Machine dependant vm stuff 103 * 104 * Created : 20/09/94 105 */ 106 107 /* 108 * Performance improvements, UVM changes, overhauls and part-rewrites 109 * were contributed by Neil A. Carson <neil (at) causality.com>. 110 */ 111 112 /* 113 * The dram block info is currently referenced from the bootconfig. 114 * This should be placed in a separate structure. 115 */ 116 117 /* 118 * Special compilation symbols 119 * PMAP_DEBUG - Build in pmap_debug_level code 120 */ 121 122 /* Include header files */ 123 124 #include "opt_pmap_debug.h" 125 #include "opt_ddb.h" 126 127 #include <sys/types.h> 128 #include <sys/param.h> 129 #include <sys/kernel.h> 130 #include <sys/systm.h> 131 #include <sys/proc.h> 132 #include <sys/malloc.h> 133 #include <sys/user.h> 134 #include <sys/pool.h> 135 #include <sys/cdefs.h> 136 137 #include <uvm/uvm.h> 138 139 #include <machine/bootconfig.h> 140 #include <machine/bus.h> 141 #include <machine/pmap.h> 142 #include <machine/pcb.h> 143 #include <machine/param.h> 144 #include <arm/arm32/katelib.h> 145 146 __KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.109 2002/08/13 03:36:30 thorpej Exp $"); 147 #ifdef PMAP_DEBUG 148 #define PDEBUG(_lev_,_stat_) \ 149 if (pmap_debug_level >= (_lev_)) \ 150 ((_stat_)) 151 int pmap_debug_level = -2; 152 void pmap_dump_pvlist(vaddr_t phys, char *m); 153 154 /* 155 * for switching to potentially finer grained debugging 156 */ 157 #define PDB_FOLLOW 0x0001 158 #define PDB_INIT 0x0002 159 #define PDB_ENTER 0x0004 160 #define PDB_REMOVE 0x0008 161 #define PDB_CREATE 0x0010 162 #define PDB_PTPAGE 0x0020 163 #define PDB_GROWKERN 0x0040 164 #define PDB_BITS 0x0080 165 #define PDB_COLLECT 0x0100 166 #define PDB_PROTECT 0x0200 167 #define PDB_MAP_L1 0x0400 168 #define PDB_BOOTSTRAP 0x1000 169 #define PDB_PARANOIA 0x2000 170 #define PDB_WIRING 0x4000 171 #define PDB_PVDUMP 0x8000 172 173 int debugmap = 0; 174 int pmapdebug = PDB_PARANOIA | PDB_FOLLOW; 175 #define NPDEBUG(_lev_,_stat_) \ 176 if (pmapdebug & (_lev_)) \ 177 ((_stat_)) 178 179 #else /* PMAP_DEBUG */ 180 #define PDEBUG(_lev_,_stat_) /* Nothing */ 181 #define NPDEBUG(_lev_,_stat_) /* Nothing */ 182 #endif /* PMAP_DEBUG */ 183 184 struct pmap kernel_pmap_store; 185 186 /* 187 * linked list of all non-kernel pmaps 188 */ 189 190 static LIST_HEAD(, pmap) pmaps; 191 192 /* 193 * pool that pmap structures are allocated from 194 */ 195 196 struct pool pmap_pmap_pool; 197 198 static pt_entry_t *csrc_pte, *cdst_pte; 199 static vaddr_t csrcp, cdstp; 200 201 char *memhook; 202 extern caddr_t msgbufaddr; 203 204 boolean_t pmap_initialized = FALSE; /* Has pmap_init completed? */ 205 /* 206 * locking data structures 207 */ 208 209 static struct lock pmap_main_lock; 210 static struct simplelock pvalloc_lock; 211 static struct simplelock pmaps_lock; 212 #ifdef LOCKDEBUG 213 #define PMAP_MAP_TO_HEAD_LOCK() \ 214 (void) spinlockmgr(&pmap_main_lock, LK_SHARED, NULL) 215 #define PMAP_MAP_TO_HEAD_UNLOCK() \ 216 (void) spinlockmgr(&pmap_main_lock, LK_RELEASE, NULL) 217 218 #define PMAP_HEAD_TO_MAP_LOCK() \ 219 (void) spinlockmgr(&pmap_main_lock, LK_EXCLUSIVE, NULL) 220 #define PMAP_HEAD_TO_MAP_UNLOCK() \ 221 (void) spinlockmgr(&pmap_main_lock, LK_RELEASE, NULL) 222 #else 223 #define PMAP_MAP_TO_HEAD_LOCK() /* nothing */ 224 #define PMAP_MAP_TO_HEAD_UNLOCK() /* nothing */ 225 #define PMAP_HEAD_TO_MAP_LOCK() /* nothing */ 226 #define PMAP_HEAD_TO_MAP_UNLOCK() /* nothing */ 227 #endif /* LOCKDEBUG */ 228 229 /* 230 * pv_page management structures: locked by pvalloc_lock 231 */ 232 233 TAILQ_HEAD(pv_pagelist, pv_page); 234 static struct pv_pagelist pv_freepages; /* list of pv_pages with free entrys */ 235 static struct pv_pagelist pv_unusedpgs; /* list of unused pv_pages */ 236 static int pv_nfpvents; /* # of free pv entries */ 237 static struct pv_page *pv_initpage; /* bootstrap page from kernel_map */ 238 static vaddr_t pv_cachedva; /* cached VA for later use */ 239 240 #define PVE_LOWAT (PVE_PER_PVPAGE / 2) /* free pv_entry low water mark */ 241 #define PVE_HIWAT (PVE_LOWAT + (PVE_PER_PVPAGE * 2)) 242 /* high water mark */ 243 244 /* 245 * local prototypes 246 */ 247 248 static struct pv_entry *pmap_add_pvpage __P((struct pv_page *, boolean_t)); 249 static struct pv_entry *pmap_alloc_pv __P((struct pmap *, int)); /* see codes below */ 250 #define ALLOCPV_NEED 0 /* need PV now */ 251 #define ALLOCPV_TRY 1 /* just try to allocate, don't steal */ 252 #define ALLOCPV_NONEED 2 /* don't need PV, just growing cache */ 253 static struct pv_entry *pmap_alloc_pvpage __P((struct pmap *, int)); 254 static void pmap_enter_pv __P((struct vm_page *, 255 struct pv_entry *, struct pmap *, 256 vaddr_t, struct vm_page *, int)); 257 static void pmap_free_pv __P((struct pmap *, struct pv_entry *)); 258 static void pmap_free_pvs __P((struct pmap *, struct pv_entry *)); 259 static void pmap_free_pv_doit __P((struct pv_entry *)); 260 static void pmap_free_pvpage __P((void)); 261 static boolean_t pmap_is_curpmap __P((struct pmap *)); 262 static struct pv_entry *pmap_remove_pv __P((struct vm_page *, struct pmap *, 263 vaddr_t)); 264 #define PMAP_REMOVE_ALL 0 /* remove all mappings */ 265 #define PMAP_REMOVE_SKIPWIRED 1 /* skip wired mappings */ 266 267 static u_int pmap_modify_pv __P((struct pmap *, vaddr_t, struct vm_page *, 268 u_int, u_int)); 269 270 /* 271 * Structure that describes and L1 table. 272 */ 273 struct l1pt { 274 SIMPLEQ_ENTRY(l1pt) pt_queue; /* Queue pointers */ 275 struct pglist pt_plist; /* Allocated page list */ 276 vaddr_t pt_va; /* Allocated virtual address */ 277 int pt_flags; /* Flags */ 278 }; 279 #define PTFLAG_STATIC 0x01 /* Statically allocated */ 280 #define PTFLAG_KPT 0x02 /* Kernel pt's are mapped */ 281 #define PTFLAG_CLEAN 0x04 /* L1 is clean */ 282 283 static void pmap_free_l1pt __P((struct l1pt *)); 284 static int pmap_allocpagedir __P((struct pmap *)); 285 static int pmap_clean_page __P((struct pv_entry *, boolean_t)); 286 static void pmap_remove_all __P((struct vm_page *)); 287 288 static int pmap_alloc_ptpt(struct pmap *); 289 static void pmap_free_ptpt(struct pmap *); 290 291 static struct vm_page *pmap_alloc_ptp __P((struct pmap *, vaddr_t)); 292 static struct vm_page *pmap_get_ptp __P((struct pmap *, vaddr_t)); 293 __inline static void pmap_clearbit __P((struct vm_page *, unsigned int)); 294 295 extern paddr_t physical_start; 296 extern paddr_t physical_end; 297 extern unsigned int free_pages; 298 extern int max_processes; 299 300 vaddr_t virtual_avail; 301 vaddr_t virtual_end; 302 vaddr_t pmap_curmaxkvaddr; 303 304 vaddr_t avail_start; 305 vaddr_t avail_end; 306 307 extern pv_addr_t systempage; 308 309 /* Variables used by the L1 page table queue code */ 310 SIMPLEQ_HEAD(l1pt_queue, l1pt); 311 static struct l1pt_queue l1pt_static_queue; /* head of our static l1 queue */ 312 static int l1pt_static_queue_count; /* items in the static l1 queue */ 313 static int l1pt_static_create_count; /* static l1 items created */ 314 static struct l1pt_queue l1pt_queue; /* head of our l1 queue */ 315 static int l1pt_queue_count; /* items in the l1 queue */ 316 static int l1pt_create_count; /* stat - L1's create count */ 317 static int l1pt_reuse_count; /* stat - L1's reused count */ 318 319 /* Local function prototypes (not used outside this file) */ 320 void pmap_pinit __P((struct pmap *)); 321 void pmap_freepagedir __P((struct pmap *)); 322 323 /* Other function prototypes */ 324 extern void bzero_page __P((vaddr_t)); 325 extern void bcopy_page __P((vaddr_t, vaddr_t)); 326 327 struct l1pt *pmap_alloc_l1pt __P((void)); 328 static __inline void pmap_map_in_l1 __P((struct pmap *pmap, vaddr_t va, 329 vaddr_t l2pa, boolean_t)); 330 331 static pt_entry_t *pmap_map_ptes __P((struct pmap *)); 332 static void pmap_unmap_ptes __P((struct pmap *)); 333 334 __inline static void pmap_vac_me_harder __P((struct pmap *, struct vm_page *, 335 pt_entry_t *, boolean_t)); 336 static void pmap_vac_me_kpmap __P((struct pmap *, struct vm_page *, 337 pt_entry_t *, boolean_t)); 338 static void pmap_vac_me_user __P((struct pmap *, struct vm_page *, 339 pt_entry_t *, boolean_t)); 340 341 /* 342 * real definition of pv_entry. 343 */ 344 345 struct pv_entry { 346 struct pv_entry *pv_next; /* next pv_entry */ 347 struct pmap *pv_pmap; /* pmap where mapping lies */ 348 vaddr_t pv_va; /* virtual address for mapping */ 349 int pv_flags; /* flags */ 350 struct vm_page *pv_ptp; /* vm_page for the ptp */ 351 }; 352 353 /* 354 * pv_entrys are dynamically allocated in chunks from a single page. 355 * we keep track of how many pv_entrys are in use for each page and 356 * we can free pv_entry pages if needed. there is one lock for the 357 * entire allocation system. 358 */ 359 360 struct pv_page_info { 361 TAILQ_ENTRY(pv_page) pvpi_list; 362 struct pv_entry *pvpi_pvfree; 363 int pvpi_nfree; 364 }; 365 366 /* 367 * number of pv_entry's in a pv_page 368 * (note: won't work on systems where NPBG isn't a constant) 369 */ 370 371 #define PVE_PER_PVPAGE ((NBPG - sizeof(struct pv_page_info)) / \ 372 sizeof(struct pv_entry)) 373 374 /* 375 * a pv_page: where pv_entrys are allocated from 376 */ 377 378 struct pv_page { 379 struct pv_page_info pvinfo; 380 struct pv_entry pvents[PVE_PER_PVPAGE]; 381 }; 382 383 #ifdef MYCROFT_HACK 384 int mycroft_hack = 0; 385 #endif 386 387 /* Function to set the debug level of the pmap code */ 388 389 #ifdef PMAP_DEBUG 390 void 391 pmap_debug(int level) 392 { 393 pmap_debug_level = level; 394 printf("pmap_debug: level=%d\n", pmap_debug_level); 395 } 396 #endif /* PMAP_DEBUG */ 397 398 __inline static boolean_t 399 pmap_is_curpmap(struct pmap *pmap) 400 { 401 402 if ((curproc && curproc->p_vmspace->vm_map.pmap == pmap) || 403 pmap == pmap_kernel()) 404 return (TRUE); 405 406 return (FALSE); 407 } 408 409 /* 410 * p v _ e n t r y f u n c t i o n s 411 */ 412 413 /* 414 * pv_entry allocation functions: 415 * the main pv_entry allocation functions are: 416 * pmap_alloc_pv: allocate a pv_entry structure 417 * pmap_free_pv: free one pv_entry 418 * pmap_free_pvs: free a list of pv_entrys 419 * 420 * the rest are helper functions 421 */ 422 423 /* 424 * pmap_alloc_pv: inline function to allocate a pv_entry structure 425 * => we lock pvalloc_lock 426 * => if we fail, we call out to pmap_alloc_pvpage 427 * => 3 modes: 428 * ALLOCPV_NEED = we really need a pv_entry, even if we have to steal it 429 * ALLOCPV_TRY = we want a pv_entry, but not enough to steal 430 * ALLOCPV_NONEED = we are trying to grow our free list, don't really need 431 * one now 432 * 433 * "try" is for optional functions like pmap_copy(). 434 */ 435 436 __inline static struct pv_entry * 437 pmap_alloc_pv(struct pmap *pmap, int mode) 438 { 439 struct pv_page *pvpage; 440 struct pv_entry *pv; 441 442 simple_lock(&pvalloc_lock); 443 444 pvpage = TAILQ_FIRST(&pv_freepages); 445 446 if (pvpage != NULL) { 447 pvpage->pvinfo.pvpi_nfree--; 448 if (pvpage->pvinfo.pvpi_nfree == 0) { 449 /* nothing left in this one? */ 450 TAILQ_REMOVE(&pv_freepages, pvpage, pvinfo.pvpi_list); 451 } 452 pv = pvpage->pvinfo.pvpi_pvfree; 453 KASSERT(pv); 454 pvpage->pvinfo.pvpi_pvfree = pv->pv_next; 455 pv_nfpvents--; /* took one from pool */ 456 } else { 457 pv = NULL; /* need more of them */ 458 } 459 460 /* 461 * if below low water mark or we didn't get a pv_entry we try and 462 * create more pv_entrys ... 463 */ 464 465 if (pv_nfpvents < PVE_LOWAT || pv == NULL) { 466 if (pv == NULL) 467 pv = pmap_alloc_pvpage(pmap, (mode == ALLOCPV_TRY) ? 468 mode : ALLOCPV_NEED); 469 else 470 (void) pmap_alloc_pvpage(pmap, ALLOCPV_NONEED); 471 } 472 473 simple_unlock(&pvalloc_lock); 474 return(pv); 475 } 476 477 /* 478 * pmap_alloc_pvpage: maybe allocate a new pvpage 479 * 480 * if need_entry is false: try and allocate a new pv_page 481 * if need_entry is true: try and allocate a new pv_page and return a 482 * new pv_entry from it. if we are unable to allocate a pv_page 483 * we make a last ditch effort to steal a pv_page from some other 484 * mapping. if that fails, we panic... 485 * 486 * => we assume that the caller holds pvalloc_lock 487 */ 488 489 static struct pv_entry * 490 pmap_alloc_pvpage(struct pmap *pmap, int mode) 491 { 492 struct vm_page *pg; 493 struct pv_page *pvpage; 494 struct pv_entry *pv; 495 int s; 496 497 /* 498 * if we need_entry and we've got unused pv_pages, allocate from there 499 */ 500 501 pvpage = TAILQ_FIRST(&pv_unusedpgs); 502 if (mode != ALLOCPV_NONEED && pvpage != NULL) { 503 504 /* move it to pv_freepages list */ 505 TAILQ_REMOVE(&pv_unusedpgs, pvpage, pvinfo.pvpi_list); 506 TAILQ_INSERT_HEAD(&pv_freepages, pvpage, pvinfo.pvpi_list); 507 508 /* allocate a pv_entry */ 509 pvpage->pvinfo.pvpi_nfree--; /* can't go to zero */ 510 pv = pvpage->pvinfo.pvpi_pvfree; 511 KASSERT(pv); 512 pvpage->pvinfo.pvpi_pvfree = pv->pv_next; 513 514 pv_nfpvents--; /* took one from pool */ 515 return(pv); 516 } 517 518 /* 519 * see if we've got a cached unmapped VA that we can map a page in. 520 * if not, try to allocate one. 521 */ 522 523 524 if (pv_cachedva == 0) { 525 s = splvm(); 526 pv_cachedva = uvm_km_kmemalloc(kmem_map, NULL, 527 PAGE_SIZE, UVM_KMF_TRYLOCK|UVM_KMF_VALLOC); 528 splx(s); 529 if (pv_cachedva == 0) { 530 return (NULL); 531 } 532 } 533 534 pg = uvm_pagealloc(NULL, pv_cachedva - vm_map_min(kernel_map), NULL, 535 UVM_PGA_USERESERVE); 536 537 if (pg == NULL) 538 return (NULL); 539 pg->flags &= ~PG_BUSY; /* never busy */ 540 541 /* 542 * add a mapping for our new pv_page and free its entrys (save one!) 543 * 544 * NOTE: If we are allocating a PV page for the kernel pmap, the 545 * pmap is already locked! (...but entering the mapping is safe...) 546 */ 547 548 pmap_kenter_pa(pv_cachedva, VM_PAGE_TO_PHYS(pg), 549 VM_PROT_READ|VM_PROT_WRITE); 550 pmap_update(pmap_kernel()); 551 pvpage = (struct pv_page *) pv_cachedva; 552 pv_cachedva = 0; 553 return (pmap_add_pvpage(pvpage, mode != ALLOCPV_NONEED)); 554 } 555 556 /* 557 * pmap_add_pvpage: add a pv_page's pv_entrys to the free list 558 * 559 * => caller must hold pvalloc_lock 560 * => if need_entry is true, we allocate and return one pv_entry 561 */ 562 563 static struct pv_entry * 564 pmap_add_pvpage(struct pv_page *pvp, boolean_t need_entry) 565 { 566 int tofree, lcv; 567 568 /* do we need to return one? */ 569 tofree = (need_entry) ? PVE_PER_PVPAGE - 1 : PVE_PER_PVPAGE; 570 571 pvp->pvinfo.pvpi_pvfree = NULL; 572 pvp->pvinfo.pvpi_nfree = tofree; 573 for (lcv = 0 ; lcv < tofree ; lcv++) { 574 pvp->pvents[lcv].pv_next = pvp->pvinfo.pvpi_pvfree; 575 pvp->pvinfo.pvpi_pvfree = &pvp->pvents[lcv]; 576 } 577 if (need_entry) 578 TAILQ_INSERT_TAIL(&pv_freepages, pvp, pvinfo.pvpi_list); 579 else 580 TAILQ_INSERT_TAIL(&pv_unusedpgs, pvp, pvinfo.pvpi_list); 581 pv_nfpvents += tofree; 582 return((need_entry) ? &pvp->pvents[lcv] : NULL); 583 } 584 585 /* 586 * pmap_free_pv_doit: actually free a pv_entry 587 * 588 * => do not call this directly! instead use either 589 * 1. pmap_free_pv ==> free a single pv_entry 590 * 2. pmap_free_pvs => free a list of pv_entrys 591 * => we must be holding pvalloc_lock 592 */ 593 594 __inline static void 595 pmap_free_pv_doit(struct pv_entry *pv) 596 { 597 struct pv_page *pvp; 598 599 pvp = (struct pv_page *) arm_trunc_page((vaddr_t)pv); 600 pv_nfpvents++; 601 pvp->pvinfo.pvpi_nfree++; 602 603 /* nfree == 1 => fully allocated page just became partly allocated */ 604 if (pvp->pvinfo.pvpi_nfree == 1) { 605 TAILQ_INSERT_HEAD(&pv_freepages, pvp, pvinfo.pvpi_list); 606 } 607 608 /* free it */ 609 pv->pv_next = pvp->pvinfo.pvpi_pvfree; 610 pvp->pvinfo.pvpi_pvfree = pv; 611 612 /* 613 * are all pv_page's pv_entry's free? move it to unused queue. 614 */ 615 616 if (pvp->pvinfo.pvpi_nfree == PVE_PER_PVPAGE) { 617 TAILQ_REMOVE(&pv_freepages, pvp, pvinfo.pvpi_list); 618 TAILQ_INSERT_HEAD(&pv_unusedpgs, pvp, pvinfo.pvpi_list); 619 } 620 } 621 622 /* 623 * pmap_free_pv: free a single pv_entry 624 * 625 * => we gain the pvalloc_lock 626 */ 627 628 __inline static void 629 pmap_free_pv(struct pmap *pmap, struct pv_entry *pv) 630 { 631 simple_lock(&pvalloc_lock); 632 pmap_free_pv_doit(pv); 633 634 /* 635 * Can't free the PV page if the PV entries were associated with 636 * the kernel pmap; the pmap is already locked. 637 */ 638 if (pv_nfpvents > PVE_HIWAT && TAILQ_FIRST(&pv_unusedpgs) != NULL && 639 pmap != pmap_kernel()) 640 pmap_free_pvpage(); 641 642 simple_unlock(&pvalloc_lock); 643 } 644 645 /* 646 * pmap_free_pvs: free a list of pv_entrys 647 * 648 * => we gain the pvalloc_lock 649 */ 650 651 __inline static void 652 pmap_free_pvs(struct pmap *pmap, struct pv_entry *pvs) 653 { 654 struct pv_entry *nextpv; 655 656 simple_lock(&pvalloc_lock); 657 658 for ( /* null */ ; pvs != NULL ; pvs = nextpv) { 659 nextpv = pvs->pv_next; 660 pmap_free_pv_doit(pvs); 661 } 662 663 /* 664 * Can't free the PV page if the PV entries were associated with 665 * the kernel pmap; the pmap is already locked. 666 */ 667 if (pv_nfpvents > PVE_HIWAT && TAILQ_FIRST(&pv_unusedpgs) != NULL && 668 pmap != pmap_kernel()) 669 pmap_free_pvpage(); 670 671 simple_unlock(&pvalloc_lock); 672 } 673 674 675 /* 676 * pmap_free_pvpage: try and free an unused pv_page structure 677 * 678 * => assume caller is holding the pvalloc_lock and that 679 * there is a page on the pv_unusedpgs list 680 * => if we can't get a lock on the kmem_map we try again later 681 */ 682 683 static void 684 pmap_free_pvpage(void) 685 { 686 int s; 687 struct vm_map *map; 688 struct vm_map_entry *dead_entries; 689 struct pv_page *pvp; 690 691 s = splvm(); /* protect kmem_map */ 692 693 pvp = TAILQ_FIRST(&pv_unusedpgs); 694 695 /* 696 * note: watch out for pv_initpage which is allocated out of 697 * kernel_map rather than kmem_map. 698 */ 699 if (pvp == pv_initpage) 700 map = kernel_map; 701 else 702 map = kmem_map; 703 if (vm_map_lock_try(map)) { 704 705 /* remove pvp from pv_unusedpgs */ 706 TAILQ_REMOVE(&pv_unusedpgs, pvp, pvinfo.pvpi_list); 707 708 /* unmap the page */ 709 dead_entries = NULL; 710 uvm_unmap_remove(map, (vaddr_t)pvp, ((vaddr_t)pvp) + PAGE_SIZE, 711 &dead_entries); 712 vm_map_unlock(map); 713 714 if (dead_entries != NULL) 715 uvm_unmap_detach(dead_entries, 0); 716 717 pv_nfpvents -= PVE_PER_PVPAGE; /* update free count */ 718 } 719 if (pvp == pv_initpage) 720 /* no more initpage, we've freed it */ 721 pv_initpage = NULL; 722 723 splx(s); 724 } 725 726 /* 727 * main pv_entry manipulation functions: 728 * pmap_enter_pv: enter a mapping onto a vm_page list 729 * pmap_remove_pv: remove a mappiing from a vm_page list 730 * 731 * NOTE: pmap_enter_pv expects to lock the pvh itself 732 * pmap_remove_pv expects te caller to lock the pvh before calling 733 */ 734 735 /* 736 * pmap_enter_pv: enter a mapping onto a vm_page lst 737 * 738 * => caller should hold the proper lock on pmap_main_lock 739 * => caller should have pmap locked 740 * => we will gain the lock on the vm_page and allocate the new pv_entry 741 * => caller should adjust ptp's wire_count before calling 742 * => caller should not adjust pmap's wire_count 743 */ 744 745 __inline static void 746 pmap_enter_pv(struct vm_page *pg, struct pv_entry *pve, struct pmap *pmap, 747 vaddr_t va, struct vm_page *ptp, int flags) 748 { 749 pve->pv_pmap = pmap; 750 pve->pv_va = va; 751 pve->pv_ptp = ptp; /* NULL for kernel pmap */ 752 pve->pv_flags = flags; 753 simple_lock(&pg->mdpage.pvh_slock); /* lock vm_page */ 754 pve->pv_next = pg->mdpage.pvh_list; /* add to ... */ 755 pg->mdpage.pvh_list = pve; /* ... locked list */ 756 simple_unlock(&pg->mdpage.pvh_slock); /* unlock, done! */ 757 if (pve->pv_flags & PVF_WIRED) 758 ++pmap->pm_stats.wired_count; 759 #ifdef PMAP_ALIAS_DEBUG 760 { 761 int s = splhigh(); 762 if (pve->pv_flags & PVF_WRITE) 763 pg->mdpage.rw_mappings++; 764 else 765 pg->mdpage.ro_mappings++; 766 if (pg->mdpage.rw_mappings != 0 && 767 (pg->mdpage.kro_mappings != 0 || pg->mdpage.krw_mappings != 0)) { 768 printf("pmap_enter_pv: rw %u, kro %u, krw %u\n", 769 pg->mdpage.rw_mappings, pg->mdpage.kro_mappings, 770 pg->mdpage.krw_mappings); 771 } 772 splx(s); 773 } 774 #endif /* PMAP_ALIAS_DEBUG */ 775 } 776 777 /* 778 * pmap_remove_pv: try to remove a mapping from a pv_list 779 * 780 * => caller should hold proper lock on pmap_main_lock 781 * => pmap should be locked 782 * => caller should hold lock on vm_page [so that attrs can be adjusted] 783 * => caller should adjust ptp's wire_count and free PTP if needed 784 * => caller should NOT adjust pmap's wire_count 785 * => we return the removed pve 786 */ 787 788 __inline static struct pv_entry * 789 pmap_remove_pv(struct vm_page *pg, struct pmap *pmap, vaddr_t va) 790 { 791 struct pv_entry *pve, **prevptr; 792 793 prevptr = &pg->mdpage.pvh_list; /* previous pv_entry pointer */ 794 pve = *prevptr; 795 while (pve) { 796 if (pve->pv_pmap == pmap && pve->pv_va == va) { /* match? */ 797 *prevptr = pve->pv_next; /* remove it! */ 798 if (pve->pv_flags & PVF_WIRED) 799 --pmap->pm_stats.wired_count; 800 #ifdef PMAP_ALIAS_DEBUG 801 { 802 int s = splhigh(); 803 if (pve->pv_flags & PVF_WRITE) { 804 KASSERT(pg->mdpage.rw_mappings != 0); 805 pg->mdpage.rw_mappings--; 806 } else { 807 KASSERT(pg->mdpage.ro_mappings != 0); 808 pg->mdpage.ro_mappings--; 809 } 810 splx(s); 811 } 812 #endif /* PMAP_ALIAS_DEBUG */ 813 break; 814 } 815 prevptr = &pve->pv_next; /* previous pointer */ 816 pve = pve->pv_next; /* advance */ 817 } 818 return(pve); /* return removed pve */ 819 } 820 821 /* 822 * 823 * pmap_modify_pv: Update pv flags 824 * 825 * => caller should hold lock on vm_page [so that attrs can be adjusted] 826 * => caller should NOT adjust pmap's wire_count 827 * => caller must call pmap_vac_me_harder() if writable status of a page 828 * may have changed. 829 * => we return the old flags 830 * 831 * Modify a physical-virtual mapping in the pv table 832 */ 833 834 static /* __inline */ u_int 835 pmap_modify_pv(struct pmap *pmap, vaddr_t va, struct vm_page *pg, 836 u_int bic_mask, u_int eor_mask) 837 { 838 struct pv_entry *npv; 839 u_int flags, oflags; 840 841 /* 842 * There is at least one VA mapping this page. 843 */ 844 845 for (npv = pg->mdpage.pvh_list; npv; npv = npv->pv_next) { 846 if (pmap == npv->pv_pmap && va == npv->pv_va) { 847 oflags = npv->pv_flags; 848 npv->pv_flags = flags = 849 ((oflags & ~bic_mask) ^ eor_mask); 850 if ((flags ^ oflags) & PVF_WIRED) { 851 if (flags & PVF_WIRED) 852 ++pmap->pm_stats.wired_count; 853 else 854 --pmap->pm_stats.wired_count; 855 } 856 #ifdef PMAP_ALIAS_DEBUG 857 { 858 int s = splhigh(); 859 if ((flags ^ oflags) & PVF_WRITE) { 860 if (flags & PVF_WRITE) { 861 pg->mdpage.rw_mappings++; 862 pg->mdpage.ro_mappings--; 863 if (pg->mdpage.rw_mappings != 0 && 864 (pg->mdpage.kro_mappings != 0 || 865 pg->mdpage.krw_mappings != 0)) { 866 printf("pmap_modify_pv: rw %u, " 867 "kro %u, krw %u\n", 868 pg->mdpage.rw_mappings, 869 pg->mdpage.kro_mappings, 870 pg->mdpage.krw_mappings); 871 } 872 } else { 873 KASSERT(pg->mdpage.rw_mappings != 0); 874 pg->mdpage.rw_mappings--; 875 pg->mdpage.ro_mappings++; 876 } 877 } 878 splx(s); 879 } 880 #endif /* PMAP_ALIAS_DEBUG */ 881 return (oflags); 882 } 883 } 884 return (0); 885 } 886 887 /* 888 * Map the specified level 2 pagetable into the level 1 page table for 889 * the given pmap to cover a chunk of virtual address space starting from the 890 * address specified. 891 */ 892 static __inline void 893 pmap_map_in_l1(struct pmap *pmap, vaddr_t va, paddr_t l2pa, boolean_t selfref) 894 { 895 vaddr_t ptva; 896 897 /* Calculate the index into the L1 page table. */ 898 ptva = (va >> L1_S_SHIFT) & ~3; 899 900 /* Map page table into the L1. */ 901 pmap->pm_pdir[ptva + 0] = L1_C_PROTO | (l2pa + 0x000); 902 pmap->pm_pdir[ptva + 1] = L1_C_PROTO | (l2pa + 0x400); 903 pmap->pm_pdir[ptva + 2] = L1_C_PROTO | (l2pa + 0x800); 904 pmap->pm_pdir[ptva + 3] = L1_C_PROTO | (l2pa + 0xc00); 905 906 /* Map the page table into the page table area. */ 907 if (selfref) 908 *((pt_entry_t *)(pmap->pm_vptpt + ptva)) = L2_S_PROTO | l2pa | 909 L2_S_PROT(PTE_KERNEL, VM_PROT_READ|VM_PROT_WRITE); 910 } 911 912 #if 0 913 static __inline void 914 pmap_unmap_in_l1(struct pmap *pmap, vaddr_t va) 915 { 916 vaddr_t ptva; 917 918 /* Calculate the index into the L1 page table. */ 919 ptva = (va >> L1_S_SHIFT) & ~3; 920 921 /* Unmap page table from the L1. */ 922 pmap->pm_pdir[ptva + 0] = 0; 923 pmap->pm_pdir[ptva + 1] = 0; 924 pmap->pm_pdir[ptva + 2] = 0; 925 pmap->pm_pdir[ptva + 3] = 0; 926 927 /* Unmap the page table from the page table area. */ 928 *((pt_entry_t *)(pmap->pm_vptpt + ptva)) = 0; 929 } 930 #endif 931 932 /* 933 * Used to map a range of physical addresses into kernel 934 * virtual address space. 935 * 936 * For now, VM is already on, we only need to map the 937 * specified memory. 938 * 939 * XXX This routine should eventually go away; it's only used 940 * XXX by machine-dependent crash dump code. 941 */ 942 vaddr_t 943 pmap_map(vaddr_t va, paddr_t spa, paddr_t epa, vm_prot_t prot) 944 { 945 pt_entry_t *pte; 946 947 while (spa < epa) { 948 pte = vtopte(va); 949 950 *pte = L2_S_PROTO | spa | 951 L2_S_PROT(PTE_KERNEL, prot) | pte_l2_s_cache_mode; 952 cpu_tlb_flushID_SE(va); 953 va += NBPG; 954 spa += NBPG; 955 } 956 pmap_update(pmap_kernel()); 957 return(va); 958 } 959 960 961 /* 962 * void pmap_bootstrap(pd_entry_t *kernel_l1pt, pv_addr_t kernel_ptpt) 963 * 964 * bootstrap the pmap system. This is called from initarm and allows 965 * the pmap system to initailise any structures it requires. 966 * 967 * Currently this sets up the kernel_pmap that is statically allocated 968 * and also allocated virtual addresses for certain page hooks. 969 * Currently the only one page hook is allocated that is used 970 * to zero physical pages of memory. 971 * It also initialises the start and end address of the kernel data space. 972 */ 973 974 char *boot_head; 975 976 void 977 pmap_bootstrap(pd_entry_t *kernel_l1pt, pv_addr_t kernel_ptpt) 978 { 979 pt_entry_t *pte; 980 981 pmap_kernel()->pm_pdir = kernel_l1pt; 982 pmap_kernel()->pm_pptpt = kernel_ptpt.pv_pa; 983 pmap_kernel()->pm_vptpt = kernel_ptpt.pv_va; 984 simple_lock_init(&pmap_kernel()->pm_lock); 985 pmap_kernel()->pm_obj.pgops = NULL; 986 TAILQ_INIT(&(pmap_kernel()->pm_obj.memq)); 987 pmap_kernel()->pm_obj.uo_npages = 0; 988 pmap_kernel()->pm_obj.uo_refs = 1; 989 990 virtual_avail = KERNEL_VM_BASE; 991 virtual_end = KERNEL_VM_BASE + KERNEL_VM_SIZE; 992 993 /* 994 * now we allocate the "special" VAs which are used for tmp mappings 995 * by the pmap (and other modules). we allocate the VAs by advancing 996 * virtual_avail (note that there are no pages mapped at these VAs). 997 * we find the PTE that maps the allocated VA via the linear PTE 998 * mapping. 999 */ 1000 1001 pte = ((pt_entry_t *) PTE_BASE) + atop(virtual_avail); 1002 1003 csrcp = virtual_avail; csrc_pte = pte; 1004 virtual_avail += PAGE_SIZE; pte++; 1005 1006 cdstp = virtual_avail; cdst_pte = pte; 1007 virtual_avail += PAGE_SIZE; pte++; 1008 1009 memhook = (char *) virtual_avail; /* don't need pte */ 1010 virtual_avail += PAGE_SIZE; pte++; 1011 1012 msgbufaddr = (caddr_t) virtual_avail; /* don't need pte */ 1013 virtual_avail += round_page(MSGBUFSIZE); 1014 pte += atop(round_page(MSGBUFSIZE)); 1015 1016 /* 1017 * init the static-global locks and global lists. 1018 */ 1019 spinlockinit(&pmap_main_lock, "pmaplk", 0); 1020 simple_lock_init(&pvalloc_lock); 1021 simple_lock_init(&pmaps_lock); 1022 LIST_INIT(&pmaps); 1023 TAILQ_INIT(&pv_freepages); 1024 TAILQ_INIT(&pv_unusedpgs); 1025 1026 /* 1027 * initialize the pmap pool. 1028 */ 1029 1030 pool_init(&pmap_pmap_pool, sizeof(struct pmap), 0, 0, 0, "pmappl", 1031 &pool_allocator_nointr); 1032 1033 cpu_dcache_wbinv_all(); 1034 } 1035 1036 /* 1037 * void pmap_init(void) 1038 * 1039 * Initialize the pmap module. 1040 * Called by vm_init() in vm/vm_init.c in order to initialise 1041 * any structures that the pmap system needs to map virtual memory. 1042 */ 1043 1044 extern int physmem; 1045 1046 void 1047 pmap_init(void) 1048 { 1049 1050 /* 1051 * Set the available memory vars - These do not map to real memory 1052 * addresses and cannot as the physical memory is fragmented. 1053 * They are used by ps for %mem calculations. 1054 * One could argue whether this should be the entire memory or just 1055 * the memory that is useable in a user process. 1056 */ 1057 avail_start = 0; 1058 avail_end = physmem * NBPG; 1059 1060 /* 1061 * now we need to free enough pv_entry structures to allow us to get 1062 * the kmem_map/kmem_object allocated and inited (done after this 1063 * function is finished). to do this we allocate one bootstrap page out 1064 * of kernel_map and use it to provide an initial pool of pv_entry 1065 * structures. we never free this page. 1066 */ 1067 1068 pv_initpage = (struct pv_page *) uvm_km_alloc(kernel_map, PAGE_SIZE); 1069 if (pv_initpage == NULL) 1070 panic("pmap_init: pv_initpage"); 1071 pv_cachedva = 0; /* a VA we have allocated but not used yet */ 1072 pv_nfpvents = 0; 1073 (void) pmap_add_pvpage(pv_initpage, FALSE); 1074 1075 pmap_initialized = TRUE; 1076 1077 /* Initialise our L1 page table queues and counters */ 1078 SIMPLEQ_INIT(&l1pt_static_queue); 1079 l1pt_static_queue_count = 0; 1080 l1pt_static_create_count = 0; 1081 SIMPLEQ_INIT(&l1pt_queue); 1082 l1pt_queue_count = 0; 1083 l1pt_create_count = 0; 1084 l1pt_reuse_count = 0; 1085 } 1086 1087 /* 1088 * pmap_postinit() 1089 * 1090 * This routine is called after the vm and kmem subsystems have been 1091 * initialised. This allows the pmap code to perform any initialisation 1092 * that can only be done one the memory allocation is in place. 1093 */ 1094 1095 void 1096 pmap_postinit(void) 1097 { 1098 int loop; 1099 struct l1pt *pt; 1100 1101 #ifdef PMAP_STATIC_L1S 1102 for (loop = 0; loop < PMAP_STATIC_L1S; ++loop) { 1103 #else /* PMAP_STATIC_L1S */ 1104 for (loop = 0; loop < max_processes; ++loop) { 1105 #endif /* PMAP_STATIC_L1S */ 1106 /* Allocate a L1 page table */ 1107 pt = pmap_alloc_l1pt(); 1108 if (!pt) 1109 panic("Cannot allocate static L1 page tables\n"); 1110 1111 /* Clean it */ 1112 bzero((void *)pt->pt_va, L1_TABLE_SIZE); 1113 pt->pt_flags |= (PTFLAG_STATIC | PTFLAG_CLEAN); 1114 /* Add the page table to the queue */ 1115 SIMPLEQ_INSERT_TAIL(&l1pt_static_queue, pt, pt_queue); 1116 ++l1pt_static_queue_count; 1117 ++l1pt_static_create_count; 1118 } 1119 } 1120 1121 1122 /* 1123 * Create and return a physical map. 1124 * 1125 * If the size specified for the map is zero, the map is an actual physical 1126 * map, and may be referenced by the hardware. 1127 * 1128 * If the size specified is non-zero, the map will be used in software only, 1129 * and is bounded by that size. 1130 */ 1131 1132 pmap_t 1133 pmap_create(void) 1134 { 1135 struct pmap *pmap; 1136 1137 /* 1138 * Fetch pmap entry from the pool 1139 */ 1140 1141 pmap = pool_get(&pmap_pmap_pool, PR_WAITOK); 1142 /* XXX is this really needed! */ 1143 memset(pmap, 0, sizeof(*pmap)); 1144 1145 simple_lock_init(&pmap->pm_obj.vmobjlock); 1146 pmap->pm_obj.pgops = NULL; /* currently not a mappable object */ 1147 TAILQ_INIT(&pmap->pm_obj.memq); 1148 pmap->pm_obj.uo_npages = 0; 1149 pmap->pm_obj.uo_refs = 1; 1150 pmap->pm_stats.wired_count = 0; 1151 pmap->pm_stats.resident_count = 1; 1152 pmap->pm_ptphint = NULL; 1153 1154 /* Now init the machine part of the pmap */ 1155 pmap_pinit(pmap); 1156 return(pmap); 1157 } 1158 1159 /* 1160 * pmap_alloc_l1pt() 1161 * 1162 * This routine allocates physical and virtual memory for a L1 page table 1163 * and wires it. 1164 * A l1pt structure is returned to describe the allocated page table. 1165 * 1166 * This routine is allowed to fail if the required memory cannot be allocated. 1167 * In this case NULL is returned. 1168 */ 1169 1170 struct l1pt * 1171 pmap_alloc_l1pt(void) 1172 { 1173 paddr_t pa; 1174 vaddr_t va; 1175 struct l1pt *pt; 1176 int error; 1177 struct vm_page *m; 1178 pt_entry_t *pte; 1179 1180 /* Allocate virtual address space for the L1 page table */ 1181 va = uvm_km_valloc(kernel_map, L1_TABLE_SIZE); 1182 if (va == 0) { 1183 #ifdef DIAGNOSTIC 1184 PDEBUG(0, 1185 printf("pmap: Cannot allocate pageable memory for L1\n")); 1186 #endif /* DIAGNOSTIC */ 1187 return(NULL); 1188 } 1189 1190 /* Allocate memory for the l1pt structure */ 1191 pt = (struct l1pt *)malloc(sizeof(struct l1pt), M_VMPMAP, M_WAITOK); 1192 1193 /* 1194 * Allocate pages from the VM system. 1195 */ 1196 error = uvm_pglistalloc(L1_TABLE_SIZE, physical_start, physical_end, 1197 L1_TABLE_SIZE, 0, &pt->pt_plist, 1, M_WAITOK); 1198 if (error) { 1199 #ifdef DIAGNOSTIC 1200 PDEBUG(0, 1201 printf("pmap: Cannot allocate physical mem for L1 (%d)\n", 1202 error)); 1203 #endif /* DIAGNOSTIC */ 1204 /* Release the resources we already have claimed */ 1205 free(pt, M_VMPMAP); 1206 uvm_km_free(kernel_map, va, L1_TABLE_SIZE); 1207 return(NULL); 1208 } 1209 1210 /* Map our physical pages into our virtual space */ 1211 pt->pt_va = va; 1212 m = TAILQ_FIRST(&pt->pt_plist); 1213 while (m && va < (pt->pt_va + L1_TABLE_SIZE)) { 1214 pa = VM_PAGE_TO_PHYS(m); 1215 1216 pte = vtopte(va); 1217 1218 /* 1219 * Assert that the PTE is invalid. If it's invalid, 1220 * then we are guaranteed that there won't be an entry 1221 * for this VA in the TLB. 1222 */ 1223 KDASSERT(pmap_pte_v(pte) == 0); 1224 1225 *pte = L2_S_PROTO | VM_PAGE_TO_PHYS(m) | 1226 L2_S_PROT(PTE_KERNEL, VM_PROT_READ|VM_PROT_WRITE); 1227 1228 va += NBPG; 1229 m = m->pageq.tqe_next; 1230 } 1231 1232 #ifdef DIAGNOSTIC 1233 if (m) 1234 panic("pmap_alloc_l1pt: pglist not empty\n"); 1235 #endif /* DIAGNOSTIC */ 1236 1237 pt->pt_flags = 0; 1238 return(pt); 1239 } 1240 1241 /* 1242 * Free a L1 page table previously allocated with pmap_alloc_l1pt(). 1243 */ 1244 static void 1245 pmap_free_l1pt(struct l1pt *pt) 1246 { 1247 /* Separate the physical memory for the virtual space */ 1248 pmap_kremove(pt->pt_va, L1_TABLE_SIZE); 1249 pmap_update(pmap_kernel()); 1250 1251 /* Return the physical memory */ 1252 uvm_pglistfree(&pt->pt_plist); 1253 1254 /* Free the virtual space */ 1255 uvm_km_free(kernel_map, pt->pt_va, L1_TABLE_SIZE); 1256 1257 /* Free the l1pt structure */ 1258 free(pt, M_VMPMAP); 1259 } 1260 1261 /* 1262 * pmap_alloc_ptpt: 1263 * 1264 * Allocate the page table that maps the PTE array. 1265 */ 1266 static int 1267 pmap_alloc_ptpt(struct pmap *pmap) 1268 { 1269 struct vm_page *pg; 1270 pt_entry_t *pte; 1271 1272 KASSERT(pmap->pm_vptpt == 0); 1273 1274 pmap->pm_vptpt = uvm_km_valloc(kernel_map, L2_TABLE_SIZE); 1275 if (pmap->pm_vptpt == 0) { 1276 PDEBUG(0, 1277 printf("pmap_alloc_ptpt: no KVA for PTPT\n")); 1278 return (ENOMEM); 1279 } 1280 1281 for (;;) { 1282 pg = uvm_pagealloc(NULL, 0, NULL, UVM_PGA_ZERO); 1283 if (pg != NULL) 1284 break; 1285 uvm_wait("pmap_ptpt"); 1286 } 1287 1288 pmap->pm_pptpt = VM_PAGE_TO_PHYS(pg); 1289 1290 pte = vtopte(pmap->pm_vptpt); 1291 1292 KDASSERT(pmap_pte_v(pte) == 0); 1293 1294 *pte = L2_S_PROTO | pmap->pm_pptpt | 1295 L2_S_PROT(PTE_KERNEL, VM_PROT_READ|VM_PROT_WRITE); 1296 #ifdef PMAP_ALIAS_DEBUG 1297 { 1298 int s = splhigh(); 1299 pg->mdpage.krw_mappings++; 1300 splx(s); 1301 } 1302 #endif /* PMAP_ALIAS_DEBUG */ 1303 1304 return (0); 1305 } 1306 1307 /* 1308 * pmap_free_ptpt: 1309 * 1310 * Free the page table that maps the PTE array. 1311 */ 1312 static void 1313 pmap_free_ptpt(struct pmap *pmap) 1314 { 1315 1316 pmap_kremove(pmap->pm_vptpt, L2_TABLE_SIZE); 1317 pmap_update(pmap_kernel()); 1318 1319 uvm_pagefree(PHYS_TO_VM_PAGE(pmap->pm_pptpt)); 1320 1321 uvm_km_free(kernel_map, pmap->pm_vptpt, L2_TABLE_SIZE); 1322 } 1323 1324 /* 1325 * Allocate a page directory. 1326 * This routine will either allocate a new page directory from the pool 1327 * of L1 page tables currently held by the kernel or it will allocate 1328 * a new one via pmap_alloc_l1pt(). 1329 * It will then initialise the l1 page table for use. 1330 */ 1331 static int 1332 pmap_allocpagedir(struct pmap *pmap) 1333 { 1334 paddr_t pa; 1335 struct l1pt *pt; 1336 int error; 1337 1338 PDEBUG(0, printf("pmap_allocpagedir(%p)\n", pmap)); 1339 1340 /* Do we have any spare L1's lying around ? */ 1341 if (l1pt_static_queue_count) { 1342 --l1pt_static_queue_count; 1343 pt = SIMPLEQ_FIRST(&l1pt_static_queue); 1344 SIMPLEQ_REMOVE_HEAD(&l1pt_static_queue, pt_queue); 1345 } else if (l1pt_queue_count) { 1346 --l1pt_queue_count; 1347 pt = SIMPLEQ_FIRST(&l1pt_queue); 1348 SIMPLEQ_REMOVE_HEAD(&l1pt_queue, pt_queue); 1349 ++l1pt_reuse_count; 1350 } else { 1351 pt = pmap_alloc_l1pt(); 1352 if (!pt) 1353 return(ENOMEM); 1354 ++l1pt_create_count; 1355 } 1356 1357 /* Store the pointer to the l1 descriptor in the pmap. */ 1358 pmap->pm_l1pt = pt; 1359 1360 /* Get the physical address of the start of the l1 */ 1361 pa = VM_PAGE_TO_PHYS(TAILQ_FIRST(&pt->pt_plist)); 1362 1363 /* Store the virtual address of the l1 in the pmap. */ 1364 pmap->pm_pdir = (pd_entry_t *)pt->pt_va; 1365 1366 /* Clean the L1 if it is dirty */ 1367 if (!(pt->pt_flags & PTFLAG_CLEAN)) 1368 bzero((void *)pmap->pm_pdir, (L1_TABLE_SIZE - KERNEL_PD_SIZE)); 1369 1370 /* Allocate a page table to map all the page tables for this pmap */ 1371 if ((error = pmap_alloc_ptpt(pmap)) != 0) { 1372 pmap_freepagedir(pmap); 1373 return (error); 1374 } 1375 1376 /* need to lock this all up for growkernel */ 1377 simple_lock(&pmaps_lock); 1378 1379 /* Duplicate the kernel mappings. */ 1380 bcopy((char *)pmap_kernel()->pm_pdir + (L1_TABLE_SIZE - KERNEL_PD_SIZE), 1381 (char *)pmap->pm_pdir + (L1_TABLE_SIZE - KERNEL_PD_SIZE), 1382 KERNEL_PD_SIZE); 1383 1384 /* Wire in this page table */ 1385 pmap_map_in_l1(pmap, PTE_BASE, pmap->pm_pptpt, TRUE); 1386 1387 pt->pt_flags &= ~PTFLAG_CLEAN; /* L1 is dirty now */ 1388 1389 /* 1390 * Map the kernel page tables into the new PT map. 1391 */ 1392 bcopy((char *)(PTE_BASE 1393 + (PTE_BASE >> (PGSHIFT - 2)) 1394 + ((L1_TABLE_SIZE - KERNEL_PD_SIZE) >> 2)), 1395 (char *)pmap->pm_vptpt + ((L1_TABLE_SIZE - KERNEL_PD_SIZE) >> 2), 1396 (KERNEL_PD_SIZE >> 2)); 1397 1398 LIST_INSERT_HEAD(&pmaps, pmap, pm_list); 1399 simple_unlock(&pmaps_lock); 1400 1401 return(0); 1402 } 1403 1404 1405 /* 1406 * Initialize a preallocated and zeroed pmap structure, 1407 * such as one in a vmspace structure. 1408 */ 1409 1410 void 1411 pmap_pinit(struct pmap *pmap) 1412 { 1413 int backoff = 6; 1414 int retry = 10; 1415 1416 PDEBUG(0, printf("pmap_pinit(%p)\n", pmap)); 1417 1418 /* Keep looping until we succeed in allocating a page directory */ 1419 while (pmap_allocpagedir(pmap) != 0) { 1420 /* 1421 * Ok we failed to allocate a suitable block of memory for an 1422 * L1 page table. This means that either: 1423 * 1. 16KB of virtual address space could not be allocated 1424 * 2. 16KB of physically contiguous memory on a 16KB boundary 1425 * could not be allocated. 1426 * 1427 * Since we cannot fail we will sleep for a while and try 1428 * again. 1429 * 1430 * Searching for a suitable L1 PT is expensive: 1431 * to avoid hogging the system when memory is really 1432 * scarce, use an exponential back-off so that 1433 * eventually we won't retry more than once every 8 1434 * seconds. This should allow other processes to run 1435 * to completion and free up resources. 1436 */ 1437 (void) ltsleep(&lbolt, PVM, "l1ptwait", (hz << 3) >> backoff, 1438 NULL); 1439 if (--retry == 0) { 1440 retry = 10; 1441 if (backoff) 1442 --backoff; 1443 } 1444 } 1445 1446 if (vector_page < KERNEL_BASE) { 1447 /* 1448 * Map the vector page. This will also allocate and map 1449 * an L2 table for it. 1450 */ 1451 pmap_enter(pmap, vector_page, systempage.pv_pa, 1452 VM_PROT_READ, VM_PROT_READ | PMAP_WIRED); 1453 pmap_update(pmap); 1454 } 1455 } 1456 1457 1458 void 1459 pmap_freepagedir(struct pmap *pmap) 1460 { 1461 /* Free the memory used for the page table mapping */ 1462 if (pmap->pm_vptpt != 0) 1463 pmap_free_ptpt(pmap); 1464 1465 /* junk the L1 page table */ 1466 if (pmap->pm_l1pt->pt_flags & PTFLAG_STATIC) { 1467 /* Add the page table to the queue */ 1468 SIMPLEQ_INSERT_TAIL(&l1pt_static_queue, pmap->pm_l1pt, pt_queue); 1469 ++l1pt_static_queue_count; 1470 } else if (l1pt_queue_count < 8) { 1471 /* Add the page table to the queue */ 1472 SIMPLEQ_INSERT_TAIL(&l1pt_queue, pmap->pm_l1pt, pt_queue); 1473 ++l1pt_queue_count; 1474 } else 1475 pmap_free_l1pt(pmap->pm_l1pt); 1476 } 1477 1478 1479 /* 1480 * Retire the given physical map from service. 1481 * Should only be called if the map contains no valid mappings. 1482 */ 1483 1484 void 1485 pmap_destroy(struct pmap *pmap) 1486 { 1487 struct vm_page *page; 1488 int count; 1489 1490 if (pmap == NULL) 1491 return; 1492 1493 PDEBUG(0, printf("pmap_destroy(%p)\n", pmap)); 1494 1495 /* 1496 * Drop reference count 1497 */ 1498 simple_lock(&pmap->pm_obj.vmobjlock); 1499 count = --pmap->pm_obj.uo_refs; 1500 simple_unlock(&pmap->pm_obj.vmobjlock); 1501 if (count > 0) { 1502 return; 1503 } 1504 1505 /* 1506 * reference count is zero, free pmap resources and then free pmap. 1507 */ 1508 1509 /* 1510 * remove it from global list of pmaps 1511 */ 1512 1513 simple_lock(&pmaps_lock); 1514 LIST_REMOVE(pmap, pm_list); 1515 simple_unlock(&pmaps_lock); 1516 1517 if (vector_page < KERNEL_BASE) { 1518 /* Remove the vector page mapping */ 1519 pmap_remove(pmap, vector_page, vector_page + NBPG); 1520 pmap_update(pmap); 1521 } 1522 1523 /* 1524 * Free any page tables still mapped 1525 * This is only temporay until pmap_enter can count the number 1526 * of mappings made in a page table. Then pmap_remove() can 1527 * reduce the count and free the pagetable when the count 1528 * reaches zero. Note that entries in this list should match the 1529 * contents of the ptpt, however this is faster than walking a 1024 1530 * entries looking for pt's 1531 * taken from i386 pmap.c 1532 */ 1533 /* 1534 * vmobjlock must be held while freeing pages 1535 */ 1536 simple_lock(&pmap->pm_obj.vmobjlock); 1537 while ((page = TAILQ_FIRST(&pmap->pm_obj.memq)) != NULL) { 1538 KASSERT((page->flags & PG_BUSY) == 0); 1539 page->wire_count = 0; 1540 uvm_pagefree(page); 1541 } 1542 simple_unlock(&pmap->pm_obj.vmobjlock); 1543 1544 /* Free the page dir */ 1545 pmap_freepagedir(pmap); 1546 1547 /* return the pmap to the pool */ 1548 pool_put(&pmap_pmap_pool, pmap); 1549 } 1550 1551 1552 /* 1553 * void pmap_reference(struct pmap *pmap) 1554 * 1555 * Add a reference to the specified pmap. 1556 */ 1557 1558 void 1559 pmap_reference(struct pmap *pmap) 1560 { 1561 if (pmap == NULL) 1562 return; 1563 1564 simple_lock(&pmap->pm_lock); 1565 pmap->pm_obj.uo_refs++; 1566 simple_unlock(&pmap->pm_lock); 1567 } 1568 1569 /* 1570 * void pmap_virtual_space(vaddr_t *start, vaddr_t *end) 1571 * 1572 * Return the start and end addresses of the kernel's virtual space. 1573 * These values are setup in pmap_bootstrap and are updated as pages 1574 * are allocated. 1575 */ 1576 1577 void 1578 pmap_virtual_space(vaddr_t *start, vaddr_t *end) 1579 { 1580 *start = virtual_avail; 1581 *end = virtual_end; 1582 } 1583 1584 /* 1585 * Activate the address space for the specified process. If the process 1586 * is the current process, load the new MMU context. 1587 */ 1588 void 1589 pmap_activate(struct proc *p) 1590 { 1591 struct pmap *pmap = p->p_vmspace->vm_map.pmap; 1592 struct pcb *pcb = &p->p_addr->u_pcb; 1593 1594 (void) pmap_extract(pmap_kernel(), (vaddr_t)pmap->pm_pdir, 1595 (paddr_t *)&pcb->pcb_pagedir); 1596 1597 PDEBUG(0, printf("pmap_activate: p=%p pmap=%p pcb=%p pdir=%p l1=%p\n", 1598 p, pmap, pcb, pmap->pm_pdir, pcb->pcb_pagedir)); 1599 1600 if (p == curproc) { 1601 PDEBUG(0, printf("pmap_activate: setting TTB\n")); 1602 setttb((u_int)pcb->pcb_pagedir); 1603 } 1604 } 1605 1606 /* 1607 * Deactivate the address space of the specified process. 1608 */ 1609 void 1610 pmap_deactivate(struct proc *p) 1611 { 1612 } 1613 1614 /* 1615 * Perform any deferred pmap operations. 1616 */ 1617 void 1618 pmap_update(struct pmap *pmap) 1619 { 1620 1621 /* 1622 * We haven't deferred any pmap operations, but we do need to 1623 * make sure TLB/cache operations have completed. 1624 */ 1625 cpu_cpwait(); 1626 } 1627 1628 /* 1629 * pmap_clean_page() 1630 * 1631 * This is a local function used to work out the best strategy to clean 1632 * a single page referenced by its entry in the PV table. It's used by 1633 * pmap_copy_page, pmap_zero page and maybe some others later on. 1634 * 1635 * Its policy is effectively: 1636 * o If there are no mappings, we don't bother doing anything with the cache. 1637 * o If there is one mapping, we clean just that page. 1638 * o If there are multiple mappings, we clean the entire cache. 1639 * 1640 * So that some functions can be further optimised, it returns 0 if it didn't 1641 * clean the entire cache, or 1 if it did. 1642 * 1643 * XXX One bug in this routine is that if the pv_entry has a single page 1644 * mapped at 0x00000000 a whole cache clean will be performed rather than 1645 * just the 1 page. Since this should not occur in everyday use and if it does 1646 * it will just result in not the most efficient clean for the page. 1647 */ 1648 static int 1649 pmap_clean_page(struct pv_entry *pv, boolean_t is_src) 1650 { 1651 struct pmap *pmap; 1652 struct pv_entry *npv; 1653 int cache_needs_cleaning = 0; 1654 vaddr_t page_to_clean = 0; 1655 1656 if (pv == NULL) { 1657 /* nothing mapped in so nothing to flush */ 1658 return (0); 1659 } 1660 1661 /* 1662 * Since we flush the cache each time we change curproc, we 1663 * only need to flush the page if it is in the current pmap. 1664 */ 1665 if (curproc) 1666 pmap = curproc->p_vmspace->vm_map.pmap; 1667 else 1668 pmap = pmap_kernel(); 1669 1670 for (npv = pv; npv; npv = npv->pv_next) { 1671 if (npv->pv_pmap == pmap) { 1672 /* 1673 * The page is mapped non-cacheable in 1674 * this map. No need to flush the cache. 1675 */ 1676 if (npv->pv_flags & PVF_NC) { 1677 #ifdef DIAGNOSTIC 1678 if (cache_needs_cleaning) 1679 panic("pmap_clean_page: " 1680 "cache inconsistency"); 1681 #endif 1682 break; 1683 } else if (is_src && (npv->pv_flags & PVF_WRITE) == 0) 1684 continue; 1685 if (cache_needs_cleaning) { 1686 page_to_clean = 0; 1687 break; 1688 } else 1689 page_to_clean = npv->pv_va; 1690 cache_needs_cleaning = 1; 1691 } 1692 } 1693 1694 if (page_to_clean) { 1695 /* 1696 * XXX If is_src, we really only need to write-back, 1697 * XXX not invalidate, too. Investigate further. 1698 * XXX --thorpej (at) netbsd.org 1699 */ 1700 cpu_idcache_wbinv_range(page_to_clean, NBPG); 1701 } else if (cache_needs_cleaning) { 1702 cpu_idcache_wbinv_all(); 1703 return (1); 1704 } 1705 return (0); 1706 } 1707 1708 /* 1709 * pmap_zero_page() 1710 * 1711 * Zero a given physical page by mapping it at a page hook point. 1712 * In doing the zero page op, the page we zero is mapped cachable, as with 1713 * StrongARM accesses to non-cached pages are non-burst making writing 1714 * _any_ bulk data very slow. 1715 */ 1716 #if ARM_MMU_GENERIC == 1 1717 void 1718 pmap_zero_page_generic(paddr_t phys) 1719 { 1720 #ifdef DEBUG 1721 struct vm_page *pg = PHYS_TO_VM_PAGE(phys); 1722 1723 if (pg->mdpage.pvh_list != NULL) 1724 panic("pmap_zero_page: page has mappings"); 1725 #endif 1726 1727 KDASSERT((phys & PGOFSET) == 0); 1728 1729 /* 1730 * Hook in the page, zero it, and purge the cache for that 1731 * zeroed page. Invalidate the TLB as needed. 1732 */ 1733 *cdst_pte = L2_S_PROTO | phys | 1734 L2_S_PROT(PTE_KERNEL, VM_PROT_WRITE) | pte_l2_s_cache_mode; 1735 cpu_tlb_flushD_SE(cdstp); 1736 cpu_cpwait(); 1737 bzero_page(cdstp); 1738 cpu_dcache_wbinv_range(cdstp, NBPG); 1739 } 1740 #endif /* ARM_MMU_GENERIC == 1 */ 1741 1742 #if ARM_MMU_XSCALE == 1 1743 void 1744 pmap_zero_page_xscale(paddr_t phys) 1745 { 1746 #ifdef DEBUG 1747 struct vm_page *pg = PHYS_TO_VM_PAGE(phys); 1748 1749 if (pg->mdpage.pvh_list != NULL) 1750 panic("pmap_zero_page: page has mappings"); 1751 #endif 1752 1753 KDASSERT((phys & PGOFSET) == 0); 1754 1755 /* 1756 * Hook in the page, zero it, and purge the cache for that 1757 * zeroed page. Invalidate the TLB as needed. 1758 */ 1759 *cdst_pte = L2_S_PROTO | phys | 1760 L2_S_PROT(PTE_KERNEL, VM_PROT_WRITE) | 1761 L2_C | L2_XSCALE_T_TEX(TEX_XSCALE_X); /* mini-data */ 1762 cpu_tlb_flushD_SE(cdstp); 1763 cpu_cpwait(); 1764 bzero_page(cdstp); 1765 xscale_cache_clean_minidata(); 1766 } 1767 #endif /* ARM_MMU_XSCALE == 1 */ 1768 1769 /* pmap_pageidlezero() 1770 * 1771 * The same as above, except that we assume that the page is not 1772 * mapped. This means we never have to flush the cache first. Called 1773 * from the idle loop. 1774 */ 1775 boolean_t 1776 pmap_pageidlezero(paddr_t phys) 1777 { 1778 int i, *ptr; 1779 boolean_t rv = TRUE; 1780 #ifdef DEBUG 1781 struct vm_page *pg; 1782 1783 pg = PHYS_TO_VM_PAGE(phys); 1784 if (pg->mdpage.pvh_list != NULL) 1785 panic("pmap_pageidlezero: page has mappings"); 1786 #endif 1787 1788 KDASSERT((phys & PGOFSET) == 0); 1789 1790 /* 1791 * Hook in the page, zero it, and purge the cache for that 1792 * zeroed page. Invalidate the TLB as needed. 1793 */ 1794 *cdst_pte = L2_S_PROTO | phys | 1795 L2_S_PROT(PTE_KERNEL, VM_PROT_WRITE) | pte_l2_s_cache_mode; 1796 cpu_tlb_flushD_SE(cdstp); 1797 cpu_cpwait(); 1798 1799 for (i = 0, ptr = (int *)cdstp; 1800 i < (NBPG / sizeof(int)); i++) { 1801 if (sched_whichqs != 0) { 1802 /* 1803 * A process has become ready. Abort now, 1804 * so we don't keep it waiting while we 1805 * do slow memory access to finish this 1806 * page. 1807 */ 1808 rv = FALSE; 1809 break; 1810 } 1811 *ptr++ = 0; 1812 } 1813 1814 if (rv) 1815 /* 1816 * if we aborted we'll rezero this page again later so don't 1817 * purge it unless we finished it 1818 */ 1819 cpu_dcache_wbinv_range(cdstp, NBPG); 1820 return (rv); 1821 } 1822 1823 /* 1824 * pmap_copy_page() 1825 * 1826 * Copy one physical page into another, by mapping the pages into 1827 * hook points. The same comment regarding cachability as in 1828 * pmap_zero_page also applies here. 1829 */ 1830 #if ARM_MMU_GENERIC == 1 1831 void 1832 pmap_copy_page_generic(paddr_t src, paddr_t dst) 1833 { 1834 struct vm_page *src_pg = PHYS_TO_VM_PAGE(src); 1835 #ifdef DEBUG 1836 struct vm_page *dst_pg = PHYS_TO_VM_PAGE(dst); 1837 1838 if (dst_pg->mdpage.pvh_list != NULL) 1839 panic("pmap_copy_page: dst page has mappings"); 1840 #endif 1841 1842 KDASSERT((src & PGOFSET) == 0); 1843 KDASSERT((dst & PGOFSET) == 0); 1844 1845 /* 1846 * Clean the source page. Hold the source page's lock for 1847 * the duration of the copy so that no other mappings can 1848 * be created while we have a potentially aliased mapping. 1849 */ 1850 simple_lock(&src_pg->mdpage.pvh_slock); 1851 (void) pmap_clean_page(src_pg->mdpage.pvh_list, TRUE); 1852 1853 /* 1854 * Map the pages into the page hook points, copy them, and purge 1855 * the cache for the appropriate page. Invalidate the TLB 1856 * as required. 1857 */ 1858 *csrc_pte = L2_S_PROTO | src | 1859 L2_S_PROT(PTE_KERNEL, VM_PROT_READ) | pte_l2_s_cache_mode; 1860 *cdst_pte = L2_S_PROTO | dst | 1861 L2_S_PROT(PTE_KERNEL, VM_PROT_WRITE) | pte_l2_s_cache_mode; 1862 cpu_tlb_flushD_SE(csrcp); 1863 cpu_tlb_flushD_SE(cdstp); 1864 cpu_cpwait(); 1865 bcopy_page(csrcp, cdstp); 1866 cpu_dcache_inv_range(csrcp, NBPG); 1867 simple_unlock(&src_pg->mdpage.pvh_slock); /* cache is safe again */ 1868 cpu_dcache_wbinv_range(cdstp, NBPG); 1869 } 1870 #endif /* ARM_MMU_GENERIC == 1 */ 1871 1872 #if ARM_MMU_XSCALE == 1 1873 void 1874 pmap_copy_page_xscale(paddr_t src, paddr_t dst) 1875 { 1876 struct vm_page *src_pg = PHYS_TO_VM_PAGE(src); 1877 #ifdef DEBUG 1878 struct vm_page *dst_pg = PHYS_TO_VM_PAGE(dst); 1879 1880 if (dst_pg->mdpage.pvh_list != NULL) 1881 panic("pmap_copy_page: dst page has mappings"); 1882 #endif 1883 1884 KDASSERT((src & PGOFSET) == 0); 1885 KDASSERT((dst & PGOFSET) == 0); 1886 1887 /* 1888 * Clean the source page. Hold the source page's lock for 1889 * the duration of the copy so that no other mappings can 1890 * be created while we have a potentially aliased mapping. 1891 */ 1892 simple_lock(&src_pg->mdpage.pvh_slock); 1893 (void) pmap_clean_page(src_pg->mdpage.pvh_list, TRUE); 1894 1895 /* 1896 * Map the pages into the page hook points, copy them, and purge 1897 * the cache for the appropriate page. Invalidate the TLB 1898 * as required. 1899 */ 1900 *csrc_pte = L2_S_PROTO | src | 1901 L2_S_PROT(PTE_KERNEL, VM_PROT_READ) | 1902 L2_C | L2_XSCALE_T_TEX(TEX_XSCALE_X); /* mini-data */ 1903 *cdst_pte = L2_S_PROTO | dst | 1904 L2_S_PROT(PTE_KERNEL, VM_PROT_WRITE) | 1905 L2_C | L2_XSCALE_T_TEX(TEX_XSCALE_X); /* mini-data */ 1906 cpu_tlb_flushD_SE(csrcp); 1907 cpu_tlb_flushD_SE(cdstp); 1908 cpu_cpwait(); 1909 bcopy_page(csrcp, cdstp); 1910 simple_unlock(&src_pg->mdpage.pvh_slock); /* cache is safe again */ 1911 xscale_cache_clean_minidata(); 1912 } 1913 #endif /* ARM_MMU_XSCALE == 1 */ 1914 1915 #if 0 1916 void 1917 pmap_pte_addref(struct pmap *pmap, vaddr_t va) 1918 { 1919 pd_entry_t *pde; 1920 paddr_t pa; 1921 struct vm_page *m; 1922 1923 if (pmap == pmap_kernel()) 1924 return; 1925 1926 pde = pmap_pde(pmap, va & ~(3 << L1_S_SHIFT)); 1927 pa = pmap_pte_pa(pde); 1928 m = PHYS_TO_VM_PAGE(pa); 1929 ++m->wire_count; 1930 #ifdef MYCROFT_HACK 1931 printf("addref pmap=%p va=%08lx pde=%p pa=%08lx m=%p wire=%d\n", 1932 pmap, va, pde, pa, m, m->wire_count); 1933 #endif 1934 } 1935 1936 void 1937 pmap_pte_delref(struct pmap *pmap, vaddr_t va) 1938 { 1939 pd_entry_t *pde; 1940 paddr_t pa; 1941 struct vm_page *m; 1942 1943 if (pmap == pmap_kernel()) 1944 return; 1945 1946 pde = pmap_pde(pmap, va & ~(3 << L1_S_SHIFT)); 1947 pa = pmap_pte_pa(pde); 1948 m = PHYS_TO_VM_PAGE(pa); 1949 --m->wire_count; 1950 #ifdef MYCROFT_HACK 1951 printf("delref pmap=%p va=%08lx pde=%p pa=%08lx m=%p wire=%d\n", 1952 pmap, va, pde, pa, m, m->wire_count); 1953 #endif 1954 if (m->wire_count == 0) { 1955 #ifdef MYCROFT_HACK 1956 printf("delref pmap=%p va=%08lx pde=%p pa=%08lx m=%p\n", 1957 pmap, va, pde, pa, m); 1958 #endif 1959 pmap_unmap_in_l1(pmap, va); 1960 uvm_pagefree(m); 1961 --pmap->pm_stats.resident_count; 1962 } 1963 } 1964 #else 1965 #define pmap_pte_addref(pmap, va) 1966 #define pmap_pte_delref(pmap, va) 1967 #endif 1968 1969 /* 1970 * Since we have a virtually indexed cache, we may need to inhibit caching if 1971 * there is more than one mapping and at least one of them is writable. 1972 * Since we purge the cache on every context switch, we only need to check for 1973 * other mappings within the same pmap, or kernel_pmap. 1974 * This function is also called when a page is unmapped, to possibly reenable 1975 * caching on any remaining mappings. 1976 * 1977 * The code implements the following logic, where: 1978 * 1979 * KW = # of kernel read/write pages 1980 * KR = # of kernel read only pages 1981 * UW = # of user read/write pages 1982 * UR = # of user read only pages 1983 * OW = # of user read/write pages in another pmap, then 1984 * 1985 * KC = kernel mapping is cacheable 1986 * UC = user mapping is cacheable 1987 * 1988 * KW=0,KR=0 KW=0,KR>0 KW=1,KR=0 KW>1,KR>=0 1989 * +--------------------------------------------- 1990 * UW=0,UR=0,OW=0 | --- KC=1 KC=1 KC=0 1991 * UW=0,UR>0,OW=0 | UC=1 KC=1,UC=1 KC=0,UC=0 KC=0,UC=0 1992 * UW=0,UR>0,OW>0 | UC=1 KC=0,UC=1 KC=0,UC=0 KC=0,UC=0 1993 * UW=1,UR=0,OW=0 | UC=1 KC=0,UC=0 KC=0,UC=0 KC=0,UC=0 1994 * UW>1,UR>=0,OW>=0 | UC=0 KC=0,UC=0 KC=0,UC=0 KC=0,UC=0 1995 * 1996 * Note that the pmap must have it's ptes mapped in, and passed with ptes. 1997 */ 1998 __inline static void 1999 pmap_vac_me_harder(struct pmap *pmap, struct vm_page *pg, pt_entry_t *ptes, 2000 boolean_t clear_cache) 2001 { 2002 if (pmap == pmap_kernel()) 2003 pmap_vac_me_kpmap(pmap, pg, ptes, clear_cache); 2004 else 2005 pmap_vac_me_user(pmap, pg, ptes, clear_cache); 2006 } 2007 2008 static void 2009 pmap_vac_me_kpmap(struct pmap *pmap, struct vm_page *pg, pt_entry_t *ptes, 2010 boolean_t clear_cache) 2011 { 2012 int user_entries = 0; 2013 int user_writable = 0; 2014 int user_cacheable = 0; 2015 int kernel_entries = 0; 2016 int kernel_writable = 0; 2017 int kernel_cacheable = 0; 2018 struct pv_entry *pv; 2019 struct pmap *last_pmap = pmap; 2020 2021 #ifdef DIAGNOSTIC 2022 if (pmap != pmap_kernel()) 2023 panic("pmap_vac_me_kpmap: pmap != pmap_kernel()"); 2024 #endif 2025 2026 /* 2027 * Pass one, see if there are both kernel and user pmaps for 2028 * this page. Calculate whether there are user-writable or 2029 * kernel-writable pages. 2030 */ 2031 for (pv = pg->mdpage.pvh_list; pv != NULL; pv = pv->pv_next) { 2032 if (pv->pv_pmap != pmap) { 2033 user_entries++; 2034 if (pv->pv_flags & PVF_WRITE) 2035 user_writable++; 2036 if ((pv->pv_flags & PVF_NC) == 0) 2037 user_cacheable++; 2038 } else { 2039 kernel_entries++; 2040 if (pv->pv_flags & PVF_WRITE) 2041 kernel_writable++; 2042 if ((pv->pv_flags & PVF_NC) == 0) 2043 kernel_cacheable++; 2044 } 2045 } 2046 2047 /* 2048 * We know we have just been updating a kernel entry, so if 2049 * all user pages are already cacheable, then there is nothing 2050 * further to do. 2051 */ 2052 if (kernel_entries == 0 && 2053 user_cacheable == user_entries) 2054 return; 2055 2056 if (user_entries) { 2057 /* 2058 * Scan over the list again, for each entry, if it 2059 * might not be set correctly, call pmap_vac_me_user 2060 * to recalculate the settings. 2061 */ 2062 for (pv = pg->mdpage.pvh_list; pv; pv = pv->pv_next) { 2063 /* 2064 * We know kernel mappings will get set 2065 * correctly in other calls. We also know 2066 * that if the pmap is the same as last_pmap 2067 * then we've just handled this entry. 2068 */ 2069 if (pv->pv_pmap == pmap || pv->pv_pmap == last_pmap) 2070 continue; 2071 /* 2072 * If there are kernel entries and this page 2073 * is writable but non-cacheable, then we can 2074 * skip this entry also. 2075 */ 2076 if (kernel_entries > 0 && 2077 (pv->pv_flags & (PVF_NC | PVF_WRITE)) == 2078 (PVF_NC | PVF_WRITE)) 2079 continue; 2080 /* 2081 * Similarly if there are no kernel-writable 2082 * entries and the page is already 2083 * read-only/cacheable. 2084 */ 2085 if (kernel_writable == 0 && 2086 (pv->pv_flags & (PVF_NC | PVF_WRITE)) == 0) 2087 continue; 2088 /* 2089 * For some of the remaining cases, we know 2090 * that we must recalculate, but for others we 2091 * can't tell if they are correct or not, so 2092 * we recalculate anyway. 2093 */ 2094 pmap_unmap_ptes(last_pmap); 2095 last_pmap = pv->pv_pmap; 2096 ptes = pmap_map_ptes(last_pmap); 2097 pmap_vac_me_user(last_pmap, pg, ptes, 2098 pmap_is_curpmap(last_pmap)); 2099 } 2100 /* Restore the pte mapping that was passed to us. */ 2101 if (last_pmap != pmap) { 2102 pmap_unmap_ptes(last_pmap); 2103 ptes = pmap_map_ptes(pmap); 2104 } 2105 if (kernel_entries == 0) 2106 return; 2107 } 2108 2109 pmap_vac_me_user(pmap, pg, ptes, clear_cache); 2110 return; 2111 } 2112 2113 static void 2114 pmap_vac_me_user(struct pmap *pmap, struct vm_page *pg, pt_entry_t *ptes, 2115 boolean_t clear_cache) 2116 { 2117 struct pmap *kpmap = pmap_kernel(); 2118 struct pv_entry *pv, *npv; 2119 int entries = 0; 2120 int writable = 0; 2121 int cacheable_entries = 0; 2122 int kern_cacheable = 0; 2123 int other_writable = 0; 2124 2125 pv = pg->mdpage.pvh_list; 2126 KASSERT(ptes != NULL); 2127 2128 /* 2129 * Count mappings and writable mappings in this pmap. 2130 * Include kernel mappings as part of our own. 2131 * Keep a pointer to the first one. 2132 */ 2133 for (npv = pv; npv; npv = npv->pv_next) { 2134 /* Count mappings in the same pmap */ 2135 if (pmap == npv->pv_pmap || 2136 kpmap == npv->pv_pmap) { 2137 if (entries++ == 0) 2138 pv = npv; 2139 /* Cacheable mappings */ 2140 if ((npv->pv_flags & PVF_NC) == 0) { 2141 cacheable_entries++; 2142 if (kpmap == npv->pv_pmap) 2143 kern_cacheable++; 2144 } 2145 /* Writable mappings */ 2146 if (npv->pv_flags & PVF_WRITE) 2147 ++writable; 2148 } else if (npv->pv_flags & PVF_WRITE) 2149 other_writable = 1; 2150 } 2151 2152 PDEBUG(3,printf("pmap_vac_me_harder: pmap %p Entries %d, " 2153 "writable %d cacheable %d %s\n", pmap, entries, writable, 2154 cacheable_entries, clear_cache ? "clean" : "no clean")); 2155 2156 /* 2157 * Enable or disable caching as necessary. 2158 * Note: the first entry might be part of the kernel pmap, 2159 * so we can't assume this is indicative of the state of the 2160 * other (maybe non-kpmap) entries. 2161 */ 2162 if ((entries > 1 && writable) || 2163 (entries > 0 && pmap == kpmap && other_writable)) { 2164 if (cacheable_entries == 0) 2165 return; 2166 for (npv = pv; npv; npv = npv->pv_next) { 2167 if ((pmap == npv->pv_pmap 2168 || kpmap == npv->pv_pmap) && 2169 (npv->pv_flags & PVF_NC) == 0) { 2170 ptes[arm_btop(npv->pv_va)] &= ~L2_S_CACHE_MASK; 2171 npv->pv_flags |= PVF_NC; 2172 /* 2173 * If this page needs flushing from the 2174 * cache, and we aren't going to do it 2175 * below, do it now. 2176 */ 2177 if ((cacheable_entries < 4 && 2178 (clear_cache || npv->pv_pmap == kpmap)) || 2179 (npv->pv_pmap == kpmap && 2180 !clear_cache && kern_cacheable < 4)) { 2181 cpu_idcache_wbinv_range(npv->pv_va, 2182 NBPG); 2183 cpu_tlb_flushID_SE(npv->pv_va); 2184 } 2185 } 2186 } 2187 if ((clear_cache && cacheable_entries >= 4) || 2188 kern_cacheable >= 4) { 2189 cpu_idcache_wbinv_all(); 2190 cpu_tlb_flushID(); 2191 } 2192 cpu_cpwait(); 2193 } else if (entries > 0) { 2194 /* 2195 * Turn cacheing back on for some pages. If it is a kernel 2196 * page, only do so if there are no other writable pages. 2197 */ 2198 for (npv = pv; npv; npv = npv->pv_next) { 2199 if ((pmap == npv->pv_pmap || 2200 (kpmap == npv->pv_pmap && other_writable == 0)) && 2201 (npv->pv_flags & PVF_NC)) { 2202 ptes[arm_btop(npv->pv_va)] |= 2203 pte_l2_s_cache_mode; 2204 npv->pv_flags &= ~PVF_NC; 2205 } 2206 } 2207 } 2208 } 2209 2210 /* 2211 * pmap_remove() 2212 * 2213 * pmap_remove is responsible for nuking a number of mappings for a range 2214 * of virtual address space in the current pmap. To do this efficiently 2215 * is interesting, because in a number of cases a wide virtual address 2216 * range may be supplied that contains few actual mappings. So, the 2217 * optimisations are: 2218 * 1. Try and skip over hunks of address space for which an L1 entry 2219 * does not exist. 2220 * 2. Build up a list of pages we've hit, up to a maximum, so we can 2221 * maybe do just a partial cache clean. This path of execution is 2222 * complicated by the fact that the cache must be flushed _before_ 2223 * the PTE is nuked, being a VAC :-) 2224 * 3. Maybe later fast-case a single page, but I don't think this is 2225 * going to make _that_ much difference overall. 2226 */ 2227 2228 #define PMAP_REMOVE_CLEAN_LIST_SIZE 3 2229 2230 void 2231 pmap_remove(struct pmap *pmap, vaddr_t sva, vaddr_t eva) 2232 { 2233 int cleanlist_idx = 0; 2234 struct pagelist { 2235 vaddr_t va; 2236 pt_entry_t *pte; 2237 } cleanlist[PMAP_REMOVE_CLEAN_LIST_SIZE]; 2238 pt_entry_t *pte = 0, *ptes; 2239 paddr_t pa; 2240 int pmap_active; 2241 struct vm_page *pg; 2242 2243 /* Exit quick if there is no pmap */ 2244 if (!pmap) 2245 return; 2246 2247 PDEBUG(0, printf("pmap_remove: pmap=%p sva=%08lx eva=%08lx\n", 2248 pmap, sva, eva)); 2249 2250 /* 2251 * we lock in the pmap => vm_page direction 2252 */ 2253 PMAP_MAP_TO_HEAD_LOCK(); 2254 2255 ptes = pmap_map_ptes(pmap); 2256 /* Get a page table pointer */ 2257 while (sva < eva) { 2258 if (pmap_pde_page(pmap_pde(pmap, sva))) 2259 break; 2260 sva = (sva & L1_S_FRAME) + L1_S_SIZE; 2261 } 2262 2263 pte = &ptes[arm_btop(sva)]; 2264 /* Note if the pmap is active thus require cache and tlb cleans */ 2265 pmap_active = pmap_is_curpmap(pmap); 2266 2267 /* Now loop along */ 2268 while (sva < eva) { 2269 /* Check if we can move to the next PDE (l1 chunk) */ 2270 if (!(sva & L2_ADDR_BITS)) 2271 if (!pmap_pde_page(pmap_pde(pmap, sva))) { 2272 sva += L1_S_SIZE; 2273 pte += arm_btop(L1_S_SIZE); 2274 continue; 2275 } 2276 2277 /* We've found a valid PTE, so this page of PTEs has to go. */ 2278 if (pmap_pte_v(pte)) { 2279 /* Update statistics */ 2280 --pmap->pm_stats.resident_count; 2281 2282 /* 2283 * Add this page to our cache remove list, if we can. 2284 * If, however the cache remove list is totally full, 2285 * then do a complete cache invalidation taking note 2286 * to backtrack the PTE table beforehand, and ignore 2287 * the lists in future because there's no longer any 2288 * point in bothering with them (we've paid the 2289 * penalty, so will carry on unhindered). Otherwise, 2290 * when we fall out, we just clean the list. 2291 */ 2292 PDEBUG(10, printf("remove: inv pte at %p(%x) ", pte, *pte)); 2293 pa = pmap_pte_pa(pte); 2294 2295 if (cleanlist_idx < PMAP_REMOVE_CLEAN_LIST_SIZE) { 2296 /* Add to the clean list. */ 2297 cleanlist[cleanlist_idx].pte = pte; 2298 cleanlist[cleanlist_idx].va = sva; 2299 cleanlist_idx++; 2300 } else if (cleanlist_idx == PMAP_REMOVE_CLEAN_LIST_SIZE) { 2301 int cnt; 2302 2303 /* Nuke everything if needed. */ 2304 if (pmap_active) { 2305 cpu_idcache_wbinv_all(); 2306 cpu_tlb_flushID(); 2307 } 2308 2309 /* 2310 * Roll back the previous PTE list, 2311 * and zero out the current PTE. 2312 */ 2313 for (cnt = 0; cnt < PMAP_REMOVE_CLEAN_LIST_SIZE; cnt++) { 2314 *cleanlist[cnt].pte = 0; 2315 pmap_pte_delref(pmap, cleanlist[cnt].va); 2316 } 2317 *pte = 0; 2318 pmap_pte_delref(pmap, sva); 2319 cleanlist_idx++; 2320 } else { 2321 /* 2322 * We've already nuked the cache and 2323 * TLB, so just carry on regardless, 2324 * and we won't need to do it again 2325 */ 2326 *pte = 0; 2327 pmap_pte_delref(pmap, sva); 2328 } 2329 2330 /* 2331 * Update flags. In a number of circumstances, 2332 * we could cluster a lot of these and do a 2333 * number of sequential pages in one go. 2334 */ 2335 if ((pg = PHYS_TO_VM_PAGE(pa)) != NULL) { 2336 struct pv_entry *pve; 2337 simple_lock(&pg->mdpage.pvh_slock); 2338 pve = pmap_remove_pv(pg, pmap, sva); 2339 pmap_free_pv(pmap, pve); 2340 pmap_vac_me_harder(pmap, pg, ptes, FALSE); 2341 simple_unlock(&pg->mdpage.pvh_slock); 2342 } 2343 } 2344 sva += NBPG; 2345 pte++; 2346 } 2347 2348 /* 2349 * Now, if we've fallen through down to here, chances are that there 2350 * are less than PMAP_REMOVE_CLEAN_LIST_SIZE mappings left. 2351 */ 2352 if (cleanlist_idx <= PMAP_REMOVE_CLEAN_LIST_SIZE) { 2353 u_int cnt; 2354 2355 for (cnt = 0; cnt < cleanlist_idx; cnt++) { 2356 if (pmap_active) { 2357 cpu_idcache_wbinv_range(cleanlist[cnt].va, 2358 NBPG); 2359 *cleanlist[cnt].pte = 0; 2360 cpu_tlb_flushID_SE(cleanlist[cnt].va); 2361 } else 2362 *cleanlist[cnt].pte = 0; 2363 pmap_pte_delref(pmap, cleanlist[cnt].va); 2364 } 2365 } 2366 2367 pmap_unmap_ptes(pmap); 2368 2369 PMAP_MAP_TO_HEAD_UNLOCK(); 2370 } 2371 2372 /* 2373 * Routine: pmap_remove_all 2374 * Function: 2375 * Removes this physical page from 2376 * all physical maps in which it resides. 2377 * Reflects back modify bits to the pager. 2378 */ 2379 2380 static void 2381 pmap_remove_all(struct vm_page *pg) 2382 { 2383 struct pv_entry *pv, *npv; 2384 struct pmap *pmap; 2385 pt_entry_t *pte, *ptes; 2386 2387 PDEBUG(0, printf("pmap_remove_all: pa=%lx ", VM_PAGE_TO_PHYS(pg))); 2388 2389 /* set vm_page => pmap locking */ 2390 PMAP_HEAD_TO_MAP_LOCK(); 2391 2392 simple_lock(&pg->mdpage.pvh_slock); 2393 2394 pv = pg->mdpage.pvh_list; 2395 if (pv == NULL) { 2396 PDEBUG(0, printf("free page\n")); 2397 simple_unlock(&pg->mdpage.pvh_slock); 2398 PMAP_HEAD_TO_MAP_UNLOCK(); 2399 return; 2400 } 2401 pmap_clean_page(pv, FALSE); 2402 2403 while (pv) { 2404 pmap = pv->pv_pmap; 2405 ptes = pmap_map_ptes(pmap); 2406 pte = &ptes[arm_btop(pv->pv_va)]; 2407 2408 PDEBUG(0, printf("[%p,%08x,%08lx,%08x] ", pmap, *pte, 2409 pv->pv_va, pv->pv_flags)); 2410 #ifdef DEBUG 2411 if (pmap_pde_page(pmap_pde(pmap, pv->pv_va)) == 0 || 2412 pmap_pte_v(pte) == 0 || 2413 pmap_pte_pa(pte) != VM_PAGE_TO_PHYS(pg)) 2414 panic("pmap_remove_all: bad mapping"); 2415 #endif /* DEBUG */ 2416 2417 /* 2418 * Update statistics 2419 */ 2420 --pmap->pm_stats.resident_count; 2421 2422 /* Wired bit */ 2423 if (pv->pv_flags & PVF_WIRED) 2424 --pmap->pm_stats.wired_count; 2425 2426 /* 2427 * Invalidate the PTEs. 2428 * XXX: should cluster them up and invalidate as many 2429 * as possible at once. 2430 */ 2431 2432 #ifdef needednotdone 2433 reduce wiring count on page table pages as references drop 2434 #endif 2435 2436 *pte = 0; 2437 pmap_pte_delref(pmap, pv->pv_va); 2438 2439 npv = pv->pv_next; 2440 pmap_free_pv(pmap, pv); 2441 pv = npv; 2442 pmap_unmap_ptes(pmap); 2443 } 2444 pg->mdpage.pvh_list = NULL; 2445 simple_unlock(&pg->mdpage.pvh_slock); 2446 PMAP_HEAD_TO_MAP_UNLOCK(); 2447 2448 PDEBUG(0, printf("done\n")); 2449 cpu_tlb_flushID(); 2450 cpu_cpwait(); 2451 } 2452 2453 2454 /* 2455 * Set the physical protection on the specified range of this map as requested. 2456 */ 2457 2458 void 2459 pmap_protect(struct pmap *pmap, vaddr_t sva, vaddr_t eva, vm_prot_t prot) 2460 { 2461 pt_entry_t *pte = NULL, *ptes; 2462 struct vm_page *pg; 2463 int flush = 0; 2464 2465 PDEBUG(0, printf("pmap_protect: pmap=%p %08lx->%08lx %x\n", 2466 pmap, sva, eva, prot)); 2467 2468 if (~prot & VM_PROT_READ) { 2469 /* 2470 * Just remove the mappings. pmap_update() is not required 2471 * here since the caller should do it. 2472 */ 2473 pmap_remove(pmap, sva, eva); 2474 return; 2475 } 2476 if (prot & VM_PROT_WRITE) { 2477 /* 2478 * If this is a read->write transition, just ignore it and let 2479 * uvm_fault() take care of it later. 2480 */ 2481 return; 2482 } 2483 2484 /* Need to lock map->head */ 2485 PMAP_MAP_TO_HEAD_LOCK(); 2486 2487 ptes = pmap_map_ptes(pmap); 2488 2489 /* 2490 * OK, at this point, we know we're doing write-protect operation. 2491 * If the pmap is active, write-back the range. 2492 */ 2493 if (pmap_is_curpmap(pmap)) 2494 cpu_dcache_wb_range(sva, eva - sva); 2495 2496 /* 2497 * We need to acquire a pointer to a page table page before entering 2498 * the following loop. 2499 */ 2500 while (sva < eva) { 2501 if (pmap_pde_page(pmap_pde(pmap, sva))) 2502 break; 2503 sva = (sva & L1_S_FRAME) + L1_S_SIZE; 2504 } 2505 2506 pte = &ptes[arm_btop(sva)]; 2507 2508 while (sva < eva) { 2509 /* only check once in a while */ 2510 if ((sva & L2_ADDR_BITS) == 0) { 2511 if (!pmap_pde_page(pmap_pde(pmap, sva))) { 2512 /* We can race ahead here, to the next pde. */ 2513 sva += L1_S_SIZE; 2514 pte += arm_btop(L1_S_SIZE); 2515 continue; 2516 } 2517 } 2518 2519 if (!pmap_pte_v(pte)) 2520 goto next; 2521 2522 flush = 1; 2523 2524 *pte &= ~L2_S_PROT_W; /* clear write bit */ 2525 2526 /* Clear write flag */ 2527 if ((pg = PHYS_TO_VM_PAGE(pmap_pte_pa(pte))) != NULL) { 2528 simple_lock(&pg->mdpage.pvh_slock); 2529 (void) pmap_modify_pv(pmap, sva, pg, PVF_WRITE, 0); 2530 pmap_vac_me_harder(pmap, pg, ptes, FALSE); 2531 simple_unlock(&pg->mdpage.pvh_slock); 2532 } 2533 2534 next: 2535 sva += NBPG; 2536 pte++; 2537 } 2538 pmap_unmap_ptes(pmap); 2539 PMAP_MAP_TO_HEAD_UNLOCK(); 2540 if (flush) 2541 cpu_tlb_flushID(); 2542 } 2543 2544 /* 2545 * void pmap_enter(struct pmap *pmap, vaddr_t va, paddr_t pa, vm_prot_t prot, 2546 * int flags) 2547 * 2548 * Insert the given physical page (p) at 2549 * the specified virtual address (v) in the 2550 * target physical map with the protection requested. 2551 * 2552 * If specified, the page will be wired down, meaning 2553 * that the related pte can not be reclaimed. 2554 * 2555 * NB: This is the only routine which MAY NOT lazy-evaluate 2556 * or lose information. That is, this routine must actually 2557 * insert this page into the given map NOW. 2558 */ 2559 2560 int 2561 pmap_enter(struct pmap *pmap, vaddr_t va, paddr_t pa, vm_prot_t prot, 2562 int flags) 2563 { 2564 pt_entry_t *ptes, opte, npte; 2565 paddr_t opa; 2566 boolean_t wired = (flags & PMAP_WIRED) != 0; 2567 struct vm_page *pg; 2568 struct pv_entry *pve; 2569 int error, nflags; 2570 2571 PDEBUG(5, printf("pmap_enter: V%08lx P%08lx in pmap %p prot=%08x, wired = %d\n", 2572 va, pa, pmap, prot, wired)); 2573 2574 #ifdef DIAGNOSTIC 2575 /* Valid address ? */ 2576 if (va >= (pmap_curmaxkvaddr)) 2577 panic("pmap_enter: too big"); 2578 if (pmap != pmap_kernel() && va != 0) { 2579 if (va < VM_MIN_ADDRESS || va >= VM_MAXUSER_ADDRESS) 2580 panic("pmap_enter: kernel page in user map"); 2581 } else { 2582 if (va >= VM_MIN_ADDRESS && va < VM_MAXUSER_ADDRESS) 2583 panic("pmap_enter: user page in kernel map"); 2584 if (va >= VM_MAXUSER_ADDRESS && va < VM_MAX_ADDRESS) 2585 panic("pmap_enter: entering PT page"); 2586 } 2587 #endif 2588 2589 KDASSERT(((va | pa) & PGOFSET) == 0); 2590 2591 /* 2592 * Get a pointer to the page. Later on in this function, we 2593 * test for a managed page by checking pg != NULL. 2594 */ 2595 pg = pmap_initialized ? PHYS_TO_VM_PAGE(pa) : NULL; 2596 2597 /* get lock */ 2598 PMAP_MAP_TO_HEAD_LOCK(); 2599 2600 /* 2601 * map the ptes. If there's not already an L2 table for this 2602 * address, allocate one. 2603 */ 2604 ptes = pmap_map_ptes(pmap); /* locks pmap */ 2605 if (pmap_pde_v(pmap_pde(pmap, va)) == 0) { 2606 struct vm_page *ptp; 2607 2608 /* kernel should be pre-grown */ 2609 KASSERT(pmap != pmap_kernel()); 2610 2611 /* if failure is allowed then don't try too hard */ 2612 ptp = pmap_get_ptp(pmap, va & L1_S_FRAME); 2613 if (ptp == NULL) { 2614 if (flags & PMAP_CANFAIL) { 2615 error = ENOMEM; 2616 goto out; 2617 } 2618 panic("pmap_enter: get ptp failed"); 2619 } 2620 } 2621 opte = ptes[arm_btop(va)]; 2622 2623 nflags = 0; 2624 if (prot & VM_PROT_WRITE) 2625 nflags |= PVF_WRITE; 2626 if (wired) 2627 nflags |= PVF_WIRED; 2628 2629 /* Is the pte valid ? If so then this page is already mapped */ 2630 if (l2pte_valid(opte)) { 2631 /* Get the physical address of the current page mapped */ 2632 opa = l2pte_pa(opte); 2633 2634 /* Are we mapping the same page ? */ 2635 if (opa == pa) { 2636 /* Check to see if we're doing rw->ro. */ 2637 if ((opte & L2_S_PROT_W) != 0 && 2638 (prot & VM_PROT_WRITE) == 0) { 2639 /* Yup, flush the cache if current pmap. */ 2640 if (pmap_is_curpmap(pmap)) 2641 cpu_dcache_wb_range(va, NBPG); 2642 } 2643 2644 /* Has the wiring changed ? */ 2645 if (pg != NULL) { 2646 simple_lock(&pg->mdpage.pvh_slock); 2647 (void) pmap_modify_pv(pmap, va, pg, 2648 PVF_WRITE | PVF_WIRED, nflags); 2649 simple_unlock(&pg->mdpage.pvh_slock); 2650 } 2651 } else { 2652 struct vm_page *opg; 2653 2654 /* We are replacing the page with a new one. */ 2655 cpu_idcache_wbinv_range(va, NBPG); 2656 2657 /* 2658 * If it is part of our managed memory then we 2659 * must remove it from the PV list 2660 */ 2661 if ((opg = PHYS_TO_VM_PAGE(opa)) != NULL) { 2662 simple_lock(&opg->mdpage.pvh_slock); 2663 pve = pmap_remove_pv(opg, pmap, va); 2664 simple_unlock(&opg->mdpage.pvh_slock); 2665 } else { 2666 pve = NULL; 2667 } 2668 2669 goto enter; 2670 } 2671 } else { 2672 opa = 0; 2673 pve = NULL; 2674 pmap_pte_addref(pmap, va); 2675 2676 /* pte is not valid so we must be hooking in a new page */ 2677 ++pmap->pm_stats.resident_count; 2678 2679 enter: 2680 /* 2681 * Enter on the PV list if part of our managed memory 2682 */ 2683 if (pg != NULL) { 2684 if (pve == NULL) { 2685 pve = pmap_alloc_pv(pmap, ALLOCPV_NEED); 2686 if (pve == NULL) { 2687 if (flags & PMAP_CANFAIL) { 2688 error = ENOMEM; 2689 goto out; 2690 } 2691 panic("pmap_enter: no pv entries " 2692 "available"); 2693 } 2694 } 2695 /* enter_pv locks pvh when adding */ 2696 pmap_enter_pv(pg, pve, pmap, va, NULL, nflags); 2697 } else { 2698 if (pve != NULL) 2699 pmap_free_pv(pmap, pve); 2700 } 2701 } 2702 2703 /* Construct the pte, giving the correct access. */ 2704 npte = pa; 2705 2706 /* VA 0 is magic. */ 2707 if (pmap != pmap_kernel() && va != vector_page) 2708 npte |= L2_S_PROT_U; 2709 2710 if (pg != NULL) { 2711 #ifdef DIAGNOSTIC 2712 if ((flags & VM_PROT_ALL) & ~prot) 2713 panic("pmap_enter: access_type exceeds prot"); 2714 #endif 2715 npte |= pte_l2_s_cache_mode; 2716 if (flags & VM_PROT_WRITE) { 2717 npte |= L2_S_PROTO | L2_S_PROT_W; 2718 pg->mdpage.pvh_attrs |= PVF_REF | PVF_MOD; 2719 } else if (flags & VM_PROT_ALL) { 2720 npte |= L2_S_PROTO; 2721 pg->mdpage.pvh_attrs |= PVF_REF; 2722 } else 2723 npte |= L2_TYPE_INV; 2724 } else { 2725 if (prot & VM_PROT_WRITE) 2726 npte |= L2_S_PROTO | L2_S_PROT_W; 2727 else if (prot & VM_PROT_ALL) 2728 npte |= L2_S_PROTO; 2729 else 2730 npte |= L2_TYPE_INV; 2731 } 2732 2733 #if ARM_MMU_XSCALE == 1 && defined(XSCALE_CACHE_READ_WRITE_ALLOCATE) 2734 #if ARM_NMMUS > 1 2735 # error "XXX Unable to use read/write-allocate and configure non-XScale" 2736 #endif 2737 /* 2738 * XXX BRUTAL HACK! This allows us to limp along with 2739 * XXX the read/write-allocate cache mode. 2740 */ 2741 if (pmap == pmap_kernel()) 2742 npte &= ~L2_XSCALE_T_TEX(TEX_XSCALE_X); 2743 #endif 2744 ptes[arm_btop(va)] = npte; 2745 2746 if (pg != NULL) { 2747 simple_lock(&pg->mdpage.pvh_slock); 2748 pmap_vac_me_harder(pmap, pg, ptes, pmap_is_curpmap(pmap)); 2749 simple_unlock(&pg->mdpage.pvh_slock); 2750 } 2751 2752 /* Better flush the TLB ... */ 2753 cpu_tlb_flushID_SE(va); 2754 error = 0; 2755 out: 2756 pmap_unmap_ptes(pmap); /* unlocks pmap */ 2757 PMAP_MAP_TO_HEAD_UNLOCK(); 2758 2759 return error; 2760 } 2761 2762 /* 2763 * pmap_kenter_pa: enter a kernel mapping 2764 * 2765 * => no need to lock anything assume va is already allocated 2766 * => should be faster than normal pmap enter function 2767 */ 2768 void 2769 pmap_kenter_pa(vaddr_t va, paddr_t pa, vm_prot_t prot) 2770 { 2771 pt_entry_t *pte; 2772 2773 pte = vtopte(va); 2774 KASSERT(!pmap_pte_v(pte)); 2775 2776 #ifdef PMAP_ALIAS_DEBUG 2777 { 2778 struct vm_page *pg; 2779 int s; 2780 2781 pg = PHYS_TO_VM_PAGE(pa); 2782 if (pg != NULL) { 2783 s = splhigh(); 2784 if (pg->mdpage.ro_mappings == 0 && 2785 pg->mdpage.rw_mappings == 0 && 2786 pg->mdpage.kro_mappings == 0 && 2787 pg->mdpage.krw_mappings == 0) { 2788 /* This case is okay. */ 2789 } else if (pg->mdpage.rw_mappings == 0 && 2790 pg->mdpage.krw_mappings == 0 && 2791 (prot & VM_PROT_WRITE) == 0) { 2792 /* This case is okay. */ 2793 } else { 2794 /* Something is awry. */ 2795 printf("pmap_kenter_pa: ro %u, rw %u, kro %u, krw %u " 2796 "prot 0x%x\n", pg->mdpage.ro_mappings, 2797 pg->mdpage.rw_mappings, pg->mdpage.kro_mappings, 2798 pg->mdpage.krw_mappings, prot); 2799 Debugger(); 2800 } 2801 if (prot & VM_PROT_WRITE) 2802 pg->mdpage.krw_mappings++; 2803 else 2804 pg->mdpage.kro_mappings++; 2805 splx(s); 2806 } 2807 } 2808 #endif /* PMAP_ALIAS_DEBUG */ 2809 2810 *pte = L2_S_PROTO | pa | 2811 L2_S_PROT(PTE_KERNEL, prot) | pte_l2_s_cache_mode; 2812 } 2813 2814 void 2815 pmap_kremove(vaddr_t va, vsize_t len) 2816 { 2817 pt_entry_t *pte; 2818 2819 for (len >>= PAGE_SHIFT; len > 0; len--, va += PAGE_SIZE) { 2820 2821 /* 2822 * We assume that we will only be called with small 2823 * regions of memory. 2824 */ 2825 2826 KASSERT(pmap_pde_page(pmap_pde(pmap_kernel(), va))); 2827 pte = vtopte(va); 2828 #ifdef PMAP_ALIAS_DEBUG 2829 { 2830 struct vm_page *pg; 2831 int s; 2832 2833 if ((*pte & L2_TYPE_MASK) != L2_TYPE_INV && 2834 (pg = PHYS_TO_VM_PAGE(*pte & L2_S_FRAME)) != NULL) { 2835 s = splhigh(); 2836 if (*pte & L2_S_PROT_W) { 2837 KASSERT(pg->mdpage.krw_mappings != 0); 2838 pg->mdpage.krw_mappings--; 2839 } else { 2840 KASSERT(pg->mdpage.kro_mappings != 0); 2841 pg->mdpage.kro_mappings--; 2842 } 2843 splx(s); 2844 } 2845 } 2846 #endif /* PMAP_ALIAS_DEBUG */ 2847 cpu_idcache_wbinv_range(va, PAGE_SIZE); 2848 *pte = 0; 2849 cpu_tlb_flushID_SE(va); 2850 } 2851 } 2852 2853 /* 2854 * pmap_page_protect: 2855 * 2856 * Lower the permission for all mappings to a given page. 2857 */ 2858 2859 void 2860 pmap_page_protect(struct vm_page *pg, vm_prot_t prot) 2861 { 2862 2863 PDEBUG(0, printf("pmap_page_protect(pa=%lx, prot=%d)\n", 2864 VM_PAGE_TO_PHYS(pg), prot)); 2865 2866 switch(prot) { 2867 case VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE: 2868 case VM_PROT_READ|VM_PROT_WRITE: 2869 return; 2870 2871 case VM_PROT_READ: 2872 case VM_PROT_READ|VM_PROT_EXECUTE: 2873 pmap_clearbit(pg, PVF_WRITE); 2874 break; 2875 2876 default: 2877 pmap_remove_all(pg); 2878 break; 2879 } 2880 } 2881 2882 2883 /* 2884 * Routine: pmap_unwire 2885 * Function: Clear the wired attribute for a map/virtual-address 2886 * pair. 2887 * In/out conditions: 2888 * The mapping must already exist in the pmap. 2889 */ 2890 2891 void 2892 pmap_unwire(struct pmap *pmap, vaddr_t va) 2893 { 2894 pt_entry_t *ptes; 2895 struct vm_page *pg; 2896 paddr_t pa; 2897 2898 PMAP_MAP_TO_HEAD_LOCK(); 2899 ptes = pmap_map_ptes(pmap); /* locks pmap */ 2900 2901 if (pmap_pde_v(pmap_pde(pmap, va))) { 2902 #ifdef DIAGNOSTIC 2903 if (l2pte_valid(ptes[arm_btop(va)]) == 0) 2904 panic("pmap_unwire: invalid L2 PTE"); 2905 #endif 2906 /* Extract the physical address of the page */ 2907 pa = l2pte_pa(ptes[arm_btop(va)]); 2908 2909 if ((pg = PHYS_TO_VM_PAGE(pa)) == NULL) 2910 goto out; 2911 2912 /* Update the wired bit in the pv entry for this page. */ 2913 simple_lock(&pg->mdpage.pvh_slock); 2914 (void) pmap_modify_pv(pmap, va, pg, PVF_WIRED, 0); 2915 simple_unlock(&pg->mdpage.pvh_slock); 2916 } 2917 #ifdef DIAGNOSTIC 2918 else { 2919 panic("pmap_unwire: invalid L1 PTE"); 2920 } 2921 #endif 2922 out: 2923 pmap_unmap_ptes(pmap); /* unlocks pmap */ 2924 PMAP_MAP_TO_HEAD_UNLOCK(); 2925 } 2926 2927 /* 2928 * Routine: pmap_extract 2929 * Function: 2930 * Extract the physical page address associated 2931 * with the given map/virtual_address pair. 2932 */ 2933 boolean_t 2934 pmap_extract(struct pmap *pmap, vaddr_t va, paddr_t *pap) 2935 { 2936 pd_entry_t *pde; 2937 pt_entry_t *pte, *ptes; 2938 paddr_t pa; 2939 2940 PDEBUG(5, printf("pmap_extract: pmap=%p, va=0x%08lx -> ", pmap, va)); 2941 2942 ptes = pmap_map_ptes(pmap); /* locks pmap */ 2943 2944 pde = pmap_pde(pmap, va); 2945 pte = &ptes[arm_btop(va)]; 2946 2947 if (pmap_pde_section(pde)) { 2948 pa = (*pde & L1_S_FRAME) | (va & L1_S_OFFSET); 2949 PDEBUG(5, printf("section pa=0x%08lx\n", pa)); 2950 goto out; 2951 } else if (pmap_pde_page(pde) == 0 || pmap_pte_v(pte) == 0) { 2952 PDEBUG(5, printf("no mapping\n")); 2953 goto failed; 2954 } 2955 2956 if ((*pte & L2_TYPE_MASK) == L2_TYPE_L) { 2957 pa = (*pte & L2_L_FRAME) | (va & L2_L_OFFSET); 2958 PDEBUG(5, printf("large page pa=0x%08lx\n", pa)); 2959 goto out; 2960 } 2961 2962 pa = (*pte & L2_S_FRAME) | (va & L2_S_OFFSET); 2963 PDEBUG(5, printf("small page pa=0x%08lx\n", pa)); 2964 2965 out: 2966 if (pap != NULL) 2967 *pap = pa; 2968 2969 pmap_unmap_ptes(pmap); /* unlocks pmap */ 2970 return (TRUE); 2971 2972 failed: 2973 pmap_unmap_ptes(pmap); /* unlocks pmap */ 2974 return (FALSE); 2975 } 2976 2977 2978 /* 2979 * pmap_copy: 2980 * 2981 * Copy the range specified by src_addr/len from the source map to the 2982 * range dst_addr/len in the destination map. 2983 * 2984 * This routine is only advisory and need not do anything. 2985 */ 2986 /* Call deleted in <arm/arm32/pmap.h> */ 2987 2988 #if defined(PMAP_DEBUG) 2989 void 2990 pmap_dump_pvlist(phys, m) 2991 vaddr_t phys; 2992 char *m; 2993 { 2994 struct vm_page *pg; 2995 struct pv_entry *pv; 2996 2997 if ((pg = PHYS_TO_VM_PAGE(phys)) == NULL) { 2998 printf("INVALID PA\n"); 2999 return; 3000 } 3001 simple_lock(&pg->mdpage.pvh_slock); 3002 printf("%s %08lx:", m, phys); 3003 if (pg->mdpage.pvh_list == NULL) { 3004 simple_unlock(&pg->mdpage.pvh_slock); 3005 printf(" no mappings\n"); 3006 return; 3007 } 3008 3009 for (pv = pg->mdpage.pvh_list; pv; pv = pv->pv_next) 3010 printf(" pmap %p va %08lx flags %08x", pv->pv_pmap, 3011 pv->pv_va, pv->pv_flags); 3012 3013 printf("\n"); 3014 simple_unlock(&pg->mdpage.pvh_slock); 3015 } 3016 3017 #endif /* PMAP_DEBUG */ 3018 3019 static pt_entry_t * 3020 pmap_map_ptes(struct pmap *pmap) 3021 { 3022 struct proc *p; 3023 3024 /* the kernel's pmap is always accessible */ 3025 if (pmap == pmap_kernel()) { 3026 return (pt_entry_t *)PTE_BASE; 3027 } 3028 3029 if (pmap_is_curpmap(pmap)) { 3030 simple_lock(&pmap->pm_obj.vmobjlock); 3031 return (pt_entry_t *)PTE_BASE; 3032 } 3033 3034 p = curproc; 3035 KDASSERT(p != NULL); 3036 3037 /* need to lock both curpmap and pmap: use ordered locking */ 3038 if ((vaddr_t) pmap < (vaddr_t) p->p_vmspace->vm_map.pmap) { 3039 simple_lock(&pmap->pm_obj.vmobjlock); 3040 simple_lock(&p->p_vmspace->vm_map.pmap->pm_obj.vmobjlock); 3041 } else { 3042 simple_lock(&p->p_vmspace->vm_map.pmap->pm_obj.vmobjlock); 3043 simple_lock(&pmap->pm_obj.vmobjlock); 3044 } 3045 3046 pmap_map_in_l1(p->p_vmspace->vm_map.pmap, APTE_BASE, pmap->pm_pptpt, 3047 FALSE); 3048 cpu_tlb_flushD(); 3049 cpu_cpwait(); 3050 return (pt_entry_t *)APTE_BASE; 3051 } 3052 3053 /* 3054 * pmap_unmap_ptes: unlock the PTE mapping of "pmap" 3055 */ 3056 3057 static void 3058 pmap_unmap_ptes(struct pmap *pmap) 3059 { 3060 3061 if (pmap == pmap_kernel()) { 3062 return; 3063 } 3064 if (pmap_is_curpmap(pmap)) { 3065 simple_unlock(&pmap->pm_obj.vmobjlock); 3066 } else { 3067 KDASSERT(curproc != NULL); 3068 simple_unlock(&pmap->pm_obj.vmobjlock); 3069 simple_unlock( 3070 &curproc->p_vmspace->vm_map.pmap->pm_obj.vmobjlock); 3071 } 3072 } 3073 3074 /* 3075 * Modify pte bits for all ptes corresponding to the given physical address. 3076 * We use `maskbits' rather than `clearbits' because we're always passing 3077 * constants and the latter would require an extra inversion at run-time. 3078 */ 3079 3080 static void 3081 pmap_clearbit(struct vm_page *pg, u_int maskbits) 3082 { 3083 struct pv_entry *pv; 3084 pt_entry_t *ptes, npte, opte; 3085 vaddr_t va; 3086 int tlbentry; 3087 3088 PDEBUG(1, printf("pmap_clearbit: pa=%08lx mask=%08x\n", 3089 VM_PAGE_TO_PHYS(pg), maskbits)); 3090 3091 tlbentry = 0; 3092 3093 PMAP_HEAD_TO_MAP_LOCK(); 3094 simple_lock(&pg->mdpage.pvh_slock); 3095 3096 /* 3097 * Clear saved attributes (modify, reference) 3098 */ 3099 pg->mdpage.pvh_attrs &= ~maskbits; 3100 3101 if (pg->mdpage.pvh_list == NULL) { 3102 simple_unlock(&pg->mdpage.pvh_slock); 3103 PMAP_HEAD_TO_MAP_UNLOCK(); 3104 return; 3105 } 3106 3107 /* 3108 * Loop over all current mappings setting/clearing as appropos 3109 */ 3110 for (pv = pg->mdpage.pvh_list; pv; pv = pv->pv_next) { 3111 #ifdef PMAP_ALIAS_DEBUG 3112 { 3113 int s = splhigh(); 3114 if ((maskbits & PVF_WRITE) != 0 && 3115 (pv->pv_flags & PVF_WRITE) != 0) { 3116 KASSERT(pg->mdpage.rw_mappings != 0); 3117 pg->mdpage.rw_mappings--; 3118 pg->mdpage.ro_mappings++; 3119 } 3120 splx(s); 3121 } 3122 #endif /* PMAP_ALIAS_DEBUG */ 3123 va = pv->pv_va; 3124 pv->pv_flags &= ~maskbits; 3125 ptes = pmap_map_ptes(pv->pv_pmap); /* locks pmap */ 3126 KASSERT(pmap_pde_v(pmap_pde(pv->pv_pmap, va))); 3127 npte = opte = ptes[arm_btop(va)]; 3128 if (maskbits & (PVF_WRITE|PVF_MOD)) { 3129 if ((pv->pv_flags & PVF_NC)) { 3130 /* 3131 * Entry is not cacheable: reenable 3132 * the cache, nothing to flush 3133 * 3134 * Don't turn caching on again if this 3135 * is a modified emulation. This 3136 * would be inconsitent with the 3137 * settings created by 3138 * pmap_vac_me_harder(). 3139 * 3140 * There's no need to call 3141 * pmap_vac_me_harder() here: all 3142 * pages are loosing their write 3143 * permission. 3144 * 3145 */ 3146 if (maskbits & PVF_WRITE) { 3147 npte |= pte_l2_s_cache_mode; 3148 pv->pv_flags &= ~PVF_NC; 3149 } 3150 } else if (pmap_is_curpmap(pv->pv_pmap)) { 3151 /* 3152 * Entry is cacheable: check if pmap is 3153 * current if it is flush it, 3154 * otherwise it won't be in the cache 3155 */ 3156 cpu_idcache_wbinv_range(pv->pv_va, NBPG); 3157 } 3158 3159 /* make the pte read only */ 3160 npte &= ~L2_S_PROT_W; 3161 } 3162 3163 if (maskbits & PVF_REF) { 3164 if (pmap_is_curpmap(pv->pv_pmap) && 3165 (pv->pv_flags & PVF_NC) == 0) { 3166 /* 3167 * Check npte here; we may have already 3168 * done the wbinv above, and the validity 3169 * of the PTE is the same for opte and 3170 * npte. 3171 */ 3172 if (npte & L2_S_PROT_W) { 3173 cpu_idcache_wbinv_range(pv->pv_va, 3174 NBPG); 3175 } else if ((npte & L2_TYPE_MASK) 3176 != L2_TYPE_INV) { 3177 /* XXXJRT need idcache_inv_range */ 3178 cpu_idcache_wbinv_range(pv->pv_va, 3179 NBPG); 3180 } 3181 } 3182 3183 /* make the pte invalid */ 3184 npte = (npte & ~L2_TYPE_MASK) | L2_TYPE_INV; 3185 } 3186 3187 if (npte != opte) { 3188 ptes[arm_btop(va)] = npte; 3189 /* Flush the TLB entry if a current pmap. */ 3190 if (pmap_is_curpmap(pv->pv_pmap)) 3191 cpu_tlb_flushID_SE(pv->pv_va); 3192 } 3193 3194 pmap_unmap_ptes(pv->pv_pmap); /* unlocks pmap */ 3195 } 3196 cpu_cpwait(); 3197 3198 simple_unlock(&pg->mdpage.pvh_slock); 3199 PMAP_HEAD_TO_MAP_UNLOCK(); 3200 } 3201 3202 /* 3203 * pmap_clear_modify: 3204 * 3205 * Clear the "modified" attribute for a page. 3206 */ 3207 boolean_t 3208 pmap_clear_modify(struct vm_page *pg) 3209 { 3210 boolean_t rv; 3211 3212 if (pg->mdpage.pvh_attrs & PVF_MOD) { 3213 rv = TRUE; 3214 pmap_clearbit(pg, PVF_MOD); 3215 } else 3216 rv = FALSE; 3217 3218 PDEBUG(0, printf("pmap_clear_modify pa=%08lx -> %d\n", 3219 VM_PAGE_TO_PHYS(pg), rv)); 3220 3221 return (rv); 3222 } 3223 3224 /* 3225 * pmap_clear_reference: 3226 * 3227 * Clear the "referenced" attribute for a page. 3228 */ 3229 boolean_t 3230 pmap_clear_reference(struct vm_page *pg) 3231 { 3232 boolean_t rv; 3233 3234 if (pg->mdpage.pvh_attrs & PVF_REF) { 3235 rv = TRUE; 3236 pmap_clearbit(pg, PVF_REF); 3237 } else 3238 rv = FALSE; 3239 3240 PDEBUG(0, printf("pmap_clear_reference pa=%08lx -> %d\n", 3241 VM_PAGE_TO_PHYS(pg), rv)); 3242 3243 return (rv); 3244 } 3245 3246 /* 3247 * pmap_is_modified: 3248 * 3249 * Test if a page has the "modified" attribute. 3250 */ 3251 /* See <arm/arm32/pmap.h> */ 3252 3253 /* 3254 * pmap_is_referenced: 3255 * 3256 * Test if a page has the "referenced" attribute. 3257 */ 3258 /* See <arm/arm32/pmap.h> */ 3259 3260 int 3261 pmap_modified_emulation(struct pmap *pmap, vaddr_t va) 3262 { 3263 pt_entry_t *ptes; 3264 struct vm_page *pg; 3265 paddr_t pa; 3266 u_int flags; 3267 int rv = 0; 3268 3269 PDEBUG(2, printf("pmap_modified_emulation\n")); 3270 3271 PMAP_MAP_TO_HEAD_LOCK(); 3272 ptes = pmap_map_ptes(pmap); /* locks pmap */ 3273 3274 if (pmap_pde_v(pmap_pde(pmap, va)) == 0) { 3275 PDEBUG(2, printf("L1 PTE invalid\n")); 3276 goto out; 3277 } 3278 3279 PDEBUG(1, printf("pte=%08x\n", ptes[arm_btop(va)])); 3280 3281 /* Check for a invalid pte */ 3282 if (l2pte_valid(ptes[arm_btop(va)]) == 0) 3283 goto out; 3284 3285 /* This can happen if user code tries to access kernel memory. */ 3286 if ((ptes[arm_btop(va)] & L2_S_PROT_W) != 0) 3287 goto out; 3288 3289 /* Extract the physical address of the page */ 3290 pa = l2pte_pa(ptes[arm_btop(va)]); 3291 if ((pg = PHYS_TO_VM_PAGE(pa)) == NULL) 3292 goto out; 3293 3294 /* Get the current flags for this page. */ 3295 simple_lock(&pg->mdpage.pvh_slock); 3296 3297 flags = pmap_modify_pv(pmap, va, pg, 0, 0); 3298 PDEBUG(2, printf("pmap_modified_emulation: flags = %08x\n", flags)); 3299 3300 /* 3301 * Do the flags say this page is writable ? If not then it is a 3302 * genuine write fault. If yes then the write fault is our fault 3303 * as we did not reflect the write access in the PTE. Now we know 3304 * a write has occurred we can correct this and also set the 3305 * modified bit 3306 */ 3307 if (~flags & PVF_WRITE) { 3308 simple_unlock(&pg->mdpage.pvh_slock); 3309 goto out; 3310 } 3311 3312 PDEBUG(0, 3313 printf("pmap_modified_emulation: Got a hit va=%08lx, pte = %08x\n", 3314 va, ptes[arm_btop(va)])); 3315 pg->mdpage.pvh_attrs |= PVF_REF | PVF_MOD; 3316 3317 /* 3318 * Re-enable write permissions for the page. No need to call 3319 * pmap_vac_me_harder(), since this is just a 3320 * modified-emulation fault, and the PVF_WRITE bit isn't changing. 3321 * We've already set the cacheable bits based on the assumption 3322 * that we can write to this page. 3323 */ 3324 ptes[arm_btop(va)] = 3325 (ptes[arm_btop(va)] & ~L2_TYPE_MASK) | L2_S_PROTO | L2_S_PROT_W; 3326 PDEBUG(0, printf("->(%08x)\n", ptes[arm_btop(va)])); 3327 3328 simple_unlock(&pg->mdpage.pvh_slock); 3329 3330 cpu_tlb_flushID_SE(va); 3331 cpu_cpwait(); 3332 rv = 1; 3333 out: 3334 pmap_unmap_ptes(pmap); /* unlocks pmap */ 3335 PMAP_MAP_TO_HEAD_UNLOCK(); 3336 return (rv); 3337 } 3338 3339 int 3340 pmap_handled_emulation(struct pmap *pmap, vaddr_t va) 3341 { 3342 pt_entry_t *ptes; 3343 struct vm_page *pg; 3344 paddr_t pa; 3345 int rv = 0; 3346 3347 PDEBUG(2, printf("pmap_handled_emulation\n")); 3348 3349 PMAP_MAP_TO_HEAD_LOCK(); 3350 ptes = pmap_map_ptes(pmap); /* locks pmap */ 3351 3352 if (pmap_pde_v(pmap_pde(pmap, va)) == 0) { 3353 PDEBUG(2, printf("L1 PTE invalid\n")); 3354 goto out; 3355 } 3356 3357 PDEBUG(1, printf("pte=%08x\n", ptes[arm_btop(va)])); 3358 3359 /* Check for invalid pte */ 3360 if (l2pte_valid(ptes[arm_btop(va)]) == 0) 3361 goto out; 3362 3363 /* This can happen if user code tries to access kernel memory. */ 3364 if ((ptes[arm_btop(va)] & L2_TYPE_MASK) != L2_TYPE_INV) 3365 goto out; 3366 3367 /* Extract the physical address of the page */ 3368 pa = l2pte_pa(ptes[arm_btop(va)]); 3369 if ((pg = PHYS_TO_VM_PAGE(pa)) == NULL) 3370 goto out; 3371 3372 simple_lock(&pg->mdpage.pvh_slock); 3373 3374 /* 3375 * Ok we just enable the pte and mark the attibs as handled 3376 * XXX Should we traverse the PV list and enable all PTEs? 3377 */ 3378 PDEBUG(0, 3379 printf("pmap_handled_emulation: Got a hit va=%08lx pte = %08x\n", 3380 va, ptes[arm_btop(va)])); 3381 pg->mdpage.pvh_attrs |= PVF_REF; 3382 3383 ptes[arm_btop(va)] = (ptes[arm_btop(va)] & ~L2_TYPE_MASK) | L2_S_PROTO; 3384 PDEBUG(0, printf("->(%08x)\n", ptes[arm_btop(va)])); 3385 3386 simple_unlock(&pg->mdpage.pvh_slock); 3387 3388 cpu_tlb_flushID_SE(va); 3389 cpu_cpwait(); 3390 rv = 1; 3391 out: 3392 pmap_unmap_ptes(pmap); /* unlocks pmap */ 3393 PMAP_MAP_TO_HEAD_UNLOCK(); 3394 return (rv); 3395 } 3396 3397 /* 3398 * pmap_collect: free resources held by a pmap 3399 * 3400 * => optional function. 3401 * => called when a process is swapped out to free memory. 3402 */ 3403 3404 void 3405 pmap_collect(struct pmap *pmap) 3406 { 3407 } 3408 3409 /* 3410 * Routine: pmap_procwr 3411 * 3412 * Function: 3413 * Synchronize caches corresponding to [addr, addr+len) in p. 3414 * 3415 */ 3416 void 3417 pmap_procwr(struct proc *p, vaddr_t va, int len) 3418 { 3419 /* We only need to do anything if it is the current process. */ 3420 if (p == curproc) 3421 cpu_icache_sync_range(va, len); 3422 } 3423 /* 3424 * PTP functions 3425 */ 3426 3427 /* 3428 * pmap_get_ptp: get a PTP (if there isn't one, allocate a new one) 3429 * 3430 * => pmap should NOT be pmap_kernel() 3431 * => pmap should be locked 3432 */ 3433 3434 static struct vm_page * 3435 pmap_get_ptp(struct pmap *pmap, vaddr_t va) 3436 { 3437 struct vm_page *ptp; 3438 3439 if (pmap_pde_page(pmap_pde(pmap, va))) { 3440 3441 /* valid... check hint (saves us a PA->PG lookup) */ 3442 if (pmap->pm_ptphint && 3443 (pmap->pm_pdir[pmap_pdei(va)] & L2_S_FRAME) == 3444 VM_PAGE_TO_PHYS(pmap->pm_ptphint)) 3445 return (pmap->pm_ptphint); 3446 ptp = uvm_pagelookup(&pmap->pm_obj, va); 3447 #ifdef DIAGNOSTIC 3448 if (ptp == NULL) 3449 panic("pmap_get_ptp: unmanaged user PTP"); 3450 #endif 3451 pmap->pm_ptphint = ptp; 3452 return(ptp); 3453 } 3454 3455 /* allocate a new PTP (updates ptphint) */ 3456 return(pmap_alloc_ptp(pmap, va)); 3457 } 3458 3459 /* 3460 * pmap_alloc_ptp: allocate a PTP for a PMAP 3461 * 3462 * => pmap should already be locked by caller 3463 * => we use the ptp's wire_count to count the number of active mappings 3464 * in the PTP (we start it at one to prevent any chance this PTP 3465 * will ever leak onto the active/inactive queues) 3466 */ 3467 3468 /*__inline */ static struct vm_page * 3469 pmap_alloc_ptp(struct pmap *pmap, vaddr_t va) 3470 { 3471 struct vm_page *ptp; 3472 3473 ptp = uvm_pagealloc(&pmap->pm_obj, va, NULL, 3474 UVM_PGA_USERESERVE|UVM_PGA_ZERO); 3475 if (ptp == NULL) 3476 return (NULL); 3477 3478 /* got one! */ 3479 ptp->flags &= ~PG_BUSY; /* never busy */ 3480 ptp->wire_count = 1; /* no mappings yet */ 3481 pmap_map_in_l1(pmap, va, VM_PAGE_TO_PHYS(ptp), TRUE); 3482 pmap->pm_stats.resident_count++; /* count PTP as resident */ 3483 pmap->pm_ptphint = ptp; 3484 return (ptp); 3485 } 3486 3487 vaddr_t 3488 pmap_growkernel(vaddr_t maxkvaddr) 3489 { 3490 struct pmap *kpm = pmap_kernel(), *pm; 3491 int s; 3492 paddr_t ptaddr; 3493 struct vm_page *ptp; 3494 3495 if (maxkvaddr <= pmap_curmaxkvaddr) 3496 goto out; /* we are OK */ 3497 NPDEBUG(PDB_GROWKERN, printf("pmap_growkernel: growing kernel from %lx to %lx\n", 3498 pmap_curmaxkvaddr, maxkvaddr)); 3499 3500 /* 3501 * whoops! we need to add kernel PTPs 3502 */ 3503 3504 s = splhigh(); /* to be safe */ 3505 simple_lock(&kpm->pm_obj.vmobjlock); 3506 /* due to the way the arm pmap works we map 4MB at a time */ 3507 for (/*null*/ ; pmap_curmaxkvaddr < maxkvaddr; 3508 pmap_curmaxkvaddr += 4 * L1_S_SIZE) { 3509 3510 if (uvm.page_init_done == FALSE) { 3511 3512 /* 3513 * we're growing the kernel pmap early (from 3514 * uvm_pageboot_alloc()). this case must be 3515 * handled a little differently. 3516 */ 3517 3518 if (uvm_page_physget(&ptaddr) == FALSE) 3519 panic("pmap_growkernel: out of memory"); 3520 pmap_zero_page(ptaddr); 3521 3522 /* map this page in */ 3523 pmap_map_in_l1(kpm, pmap_curmaxkvaddr, ptaddr, TRUE); 3524 3525 /* count PTP as resident */ 3526 kpm->pm_stats.resident_count++; 3527 continue; 3528 } 3529 3530 /* 3531 * THIS *MUST* BE CODED SO AS TO WORK IN THE 3532 * pmap_initialized == FALSE CASE! WE MAY BE 3533 * INVOKED WHILE pmap_init() IS RUNNING! 3534 */ 3535 3536 if ((ptp = pmap_alloc_ptp(kpm, pmap_curmaxkvaddr)) == NULL) 3537 panic("pmap_growkernel: alloc ptp failed"); 3538 3539 /* distribute new kernel PTP to all active pmaps */ 3540 simple_lock(&pmaps_lock); 3541 LIST_FOREACH(pm, &pmaps, pm_list) { 3542 pmap_map_in_l1(pm, pmap_curmaxkvaddr, 3543 VM_PAGE_TO_PHYS(ptp), TRUE); 3544 } 3545 3546 simple_unlock(&pmaps_lock); 3547 } 3548 3549 /* 3550 * flush out the cache, expensive but growkernel will happen so 3551 * rarely 3552 */ 3553 cpu_tlb_flushD(); 3554 cpu_cpwait(); 3555 3556 simple_unlock(&kpm->pm_obj.vmobjlock); 3557 splx(s); 3558 3559 out: 3560 return (pmap_curmaxkvaddr); 3561 } 3562 3563 /************************ Utility routines ****************************/ 3564 3565 /* 3566 * vector_page_setprot: 3567 * 3568 * Manipulate the protection of the vector page. 3569 */ 3570 void 3571 vector_page_setprot(int prot) 3572 { 3573 pt_entry_t *pte; 3574 3575 pte = vtopte(vector_page); 3576 3577 *pte = (*pte & ~L1_S_PROT_MASK) | L2_S_PROT(PTE_KERNEL, prot); 3578 cpu_tlb_flushD_SE(vector_page); 3579 cpu_cpwait(); 3580 } 3581 3582 /************************ Bootstrapping routines ****************************/ 3583 3584 /* 3585 * This list exists for the benefit of pmap_map_chunk(). It keeps track 3586 * of the kernel L2 tables during bootstrap, so that pmap_map_chunk() can 3587 * find them as necessary. 3588 * 3589 * Note that the data on this list is not valid after initarm() returns. 3590 */ 3591 SLIST_HEAD(, pv_addr) kernel_pt_list = SLIST_HEAD_INITIALIZER(kernel_pt_list); 3592 3593 static vaddr_t 3594 kernel_pt_lookup(paddr_t pa) 3595 { 3596 pv_addr_t *pv; 3597 3598 SLIST_FOREACH(pv, &kernel_pt_list, pv_list) { 3599 if (pv->pv_pa == pa) 3600 return (pv->pv_va); 3601 } 3602 return (0); 3603 } 3604 3605 /* 3606 * pmap_map_section: 3607 * 3608 * Create a single section mapping. 3609 */ 3610 void 3611 pmap_map_section(vaddr_t l1pt, vaddr_t va, paddr_t pa, int prot, int cache) 3612 { 3613 pd_entry_t *pde = (pd_entry_t *) l1pt; 3614 pd_entry_t fl = (cache == PTE_CACHE) ? pte_l1_s_cache_mode : 0; 3615 3616 KASSERT(((va | pa) & L1_S_OFFSET) == 0); 3617 3618 pde[va >> L1_S_SHIFT] = L1_S_PROTO | pa | 3619 L1_S_PROT(PTE_KERNEL, prot) | fl; 3620 } 3621 3622 /* 3623 * pmap_map_entry: 3624 * 3625 * Create a single page mapping. 3626 */ 3627 void 3628 pmap_map_entry(vaddr_t l1pt, vaddr_t va, paddr_t pa, int prot, int cache) 3629 { 3630 pd_entry_t *pde = (pd_entry_t *) l1pt; 3631 pt_entry_t fl = (cache == PTE_CACHE) ? pte_l2_s_cache_mode : 0; 3632 pt_entry_t *pte; 3633 3634 KASSERT(((va | pa) & PGOFSET) == 0); 3635 3636 if ((pde[va >> L1_S_SHIFT] & L1_TYPE_MASK) != L1_TYPE_C) 3637 panic("pmap_map_entry: no L2 table for VA 0x%08lx", va); 3638 3639 pte = (pt_entry_t *) 3640 kernel_pt_lookup(pde[va >> L1_S_SHIFT] & L2_S_FRAME); 3641 if (pte == NULL) 3642 panic("pmap_map_entry: can't find L2 table for VA 0x%08lx", va); 3643 3644 pte[(va >> PGSHIFT) & 0x3ff] = L2_S_PROTO | pa | 3645 L2_S_PROT(PTE_KERNEL, prot) | fl; 3646 } 3647 3648 /* 3649 * pmap_link_l2pt: 3650 * 3651 * Link the L2 page table specified by "pa" into the L1 3652 * page table at the slot for "va". 3653 */ 3654 void 3655 pmap_link_l2pt(vaddr_t l1pt, vaddr_t va, pv_addr_t *l2pv) 3656 { 3657 pd_entry_t *pde = (pd_entry_t *) l1pt; 3658 u_int slot = va >> L1_S_SHIFT; 3659 3660 KASSERT((l2pv->pv_pa & PGOFSET) == 0); 3661 3662 pde[slot + 0] = L1_C_PROTO | (l2pv->pv_pa + 0x000); 3663 pde[slot + 1] = L1_C_PROTO | (l2pv->pv_pa + 0x400); 3664 pde[slot + 2] = L1_C_PROTO | (l2pv->pv_pa + 0x800); 3665 pde[slot + 3] = L1_C_PROTO | (l2pv->pv_pa + 0xc00); 3666 3667 SLIST_INSERT_HEAD(&kernel_pt_list, l2pv, pv_list); 3668 } 3669 3670 /* 3671 * pmap_map_chunk: 3672 * 3673 * Map a chunk of memory using the most efficient mappings 3674 * possible (section, large page, small page) into the 3675 * provided L1 and L2 tables at the specified virtual address. 3676 */ 3677 vsize_t 3678 pmap_map_chunk(vaddr_t l1pt, vaddr_t va, paddr_t pa, vsize_t size, 3679 int prot, int cache) 3680 { 3681 pd_entry_t *pde = (pd_entry_t *) l1pt; 3682 pt_entry_t *pte, fl; 3683 vsize_t resid; 3684 int i; 3685 3686 resid = (size + (NBPG - 1)) & ~(NBPG - 1); 3687 3688 if (l1pt == 0) 3689 panic("pmap_map_chunk: no L1 table provided"); 3690 3691 #ifdef VERBOSE_INIT_ARM 3692 printf("pmap_map_chunk: pa=0x%lx va=0x%lx size=0x%lx resid=0x%lx " 3693 "prot=0x%x cache=%d\n", pa, va, size, resid, prot, cache); 3694 #endif 3695 3696 size = resid; 3697 3698 while (resid > 0) { 3699 /* See if we can use a section mapping. */ 3700 if (((pa | va) & L1_S_OFFSET) == 0 && 3701 resid >= L1_S_SIZE) { 3702 fl = (cache == PTE_CACHE) ? pte_l1_s_cache_mode : 0; 3703 #ifdef VERBOSE_INIT_ARM 3704 printf("S"); 3705 #endif 3706 pde[va >> L1_S_SHIFT] = L1_S_PROTO | pa | 3707 L1_S_PROT(PTE_KERNEL, prot) | fl; 3708 va += L1_S_SIZE; 3709 pa += L1_S_SIZE; 3710 resid -= L1_S_SIZE; 3711 continue; 3712 } 3713 3714 /* 3715 * Ok, we're going to use an L2 table. Make sure 3716 * one is actually in the corresponding L1 slot 3717 * for the current VA. 3718 */ 3719 if ((pde[va >> L1_S_SHIFT] & L1_TYPE_MASK) != L1_TYPE_C) 3720 panic("pmap_map_chunk: no L2 table for VA 0x%08lx", va); 3721 3722 pte = (pt_entry_t *) 3723 kernel_pt_lookup(pde[va >> L1_S_SHIFT] & L2_S_FRAME); 3724 if (pte == NULL) 3725 panic("pmap_map_chunk: can't find L2 table for VA" 3726 "0x%08lx", va); 3727 3728 /* See if we can use a L2 large page mapping. */ 3729 if (((pa | va) & L2_L_OFFSET) == 0 && 3730 resid >= L2_L_SIZE) { 3731 fl = (cache == PTE_CACHE) ? pte_l2_l_cache_mode : 0; 3732 #ifdef VERBOSE_INIT_ARM 3733 printf("L"); 3734 #endif 3735 for (i = 0; i < 16; i++) { 3736 pte[((va >> PGSHIFT) & 0x3f0) + i] = 3737 L2_L_PROTO | pa | 3738 L2_L_PROT(PTE_KERNEL, prot) | fl; 3739 } 3740 va += L2_L_SIZE; 3741 pa += L2_L_SIZE; 3742 resid -= L2_L_SIZE; 3743 continue; 3744 } 3745 3746 /* Use a small page mapping. */ 3747 fl = (cache == PTE_CACHE) ? pte_l2_s_cache_mode : 0; 3748 #ifdef VERBOSE_INIT_ARM 3749 printf("P"); 3750 #endif 3751 pte[(va >> PGSHIFT) & 0x3ff] = L2_S_PROTO | pa | 3752 L2_S_PROT(PTE_KERNEL, prot) | fl; 3753 va += NBPG; 3754 pa += NBPG; 3755 resid -= NBPG; 3756 } 3757 #ifdef VERBOSE_INIT_ARM 3758 printf("\n"); 3759 #endif 3760 return (size); 3761 } 3762 3763 /********************** PTE initialization routines **************************/ 3764 3765 /* 3766 * These routines are called when the CPU type is identified to set up 3767 * the PTE prototypes, cache modes, etc. 3768 * 3769 * The variables are always here, just in case LKMs need to reference 3770 * them (though, they shouldn't). 3771 */ 3772 3773 pt_entry_t pte_l1_s_cache_mode; 3774 pt_entry_t pte_l1_s_cache_mask; 3775 3776 pt_entry_t pte_l2_l_cache_mode; 3777 pt_entry_t pte_l2_l_cache_mask; 3778 3779 pt_entry_t pte_l2_s_cache_mode; 3780 pt_entry_t pte_l2_s_cache_mask; 3781 3782 pt_entry_t pte_l2_s_prot_u; 3783 pt_entry_t pte_l2_s_prot_w; 3784 pt_entry_t pte_l2_s_prot_mask; 3785 3786 pt_entry_t pte_l1_s_proto; 3787 pt_entry_t pte_l1_c_proto; 3788 pt_entry_t pte_l2_s_proto; 3789 3790 void (*pmap_copy_page_func)(paddr_t, paddr_t); 3791 void (*pmap_zero_page_func)(paddr_t); 3792 3793 #if ARM_MMU_GENERIC == 1 3794 void 3795 pmap_pte_init_generic(void) 3796 { 3797 3798 pte_l1_s_cache_mode = L1_S_B|L1_S_C; 3799 pte_l1_s_cache_mask = L1_S_CACHE_MASK_generic; 3800 3801 pte_l2_l_cache_mode = L2_B|L2_C; 3802 pte_l2_l_cache_mask = L2_L_CACHE_MASK_generic; 3803 3804 pte_l2_s_cache_mode = L2_B|L2_C; 3805 pte_l2_s_cache_mask = L2_S_CACHE_MASK_generic; 3806 3807 pte_l2_s_prot_u = L2_S_PROT_U_generic; 3808 pte_l2_s_prot_w = L2_S_PROT_W_generic; 3809 pte_l2_s_prot_mask = L2_S_PROT_MASK_generic; 3810 3811 pte_l1_s_proto = L1_S_PROTO_generic; 3812 pte_l1_c_proto = L1_C_PROTO_generic; 3813 pte_l2_s_proto = L2_S_PROTO_generic; 3814 3815 pmap_copy_page_func = pmap_copy_page_generic; 3816 pmap_zero_page_func = pmap_zero_page_generic; 3817 } 3818 3819 #if defined(CPU_ARM9) 3820 void 3821 pmap_pte_init_arm9(void) 3822 { 3823 3824 /* 3825 * ARM9 is compatible with generic, but we want to use 3826 * write-through caching for now. 3827 */ 3828 pmap_pte_init_generic(); 3829 3830 pte_l1_s_cache_mode = L1_S_C; 3831 pte_l2_l_cache_mode = L2_C; 3832 pte_l2_s_cache_mode = L2_C; 3833 } 3834 #endif /* CPU_ARM9 */ 3835 #endif /* ARM_MMU_GENERIC == 1 */ 3836 3837 #if ARM_MMU_XSCALE == 1 3838 void 3839 pmap_pte_init_xscale(void) 3840 { 3841 uint32_t auxctl; 3842 3843 pte_l1_s_cache_mode = L1_S_B|L1_S_C; 3844 pte_l1_s_cache_mask = L1_S_CACHE_MASK_xscale; 3845 3846 pte_l2_l_cache_mode = L2_B|L2_C; 3847 pte_l2_l_cache_mask = L2_L_CACHE_MASK_xscale; 3848 3849 pte_l2_s_cache_mode = L2_B|L2_C; 3850 pte_l2_s_cache_mask = L2_S_CACHE_MASK_xscale; 3851 3852 #ifdef XSCALE_CACHE_READ_WRITE_ALLOCATE 3853 /* 3854 * The XScale core has an enhanced mode where writes that 3855 * miss the cache cause a cache line to be allocated. This 3856 * is significantly faster than the traditional, write-through 3857 * behavior of this case. 3858 * 3859 * However, there is a bug lurking in this pmap module, or in 3860 * other parts of the VM system, or both, which causes corruption 3861 * of NFS-backed files when this cache mode is used. We have 3862 * an ugly work-around for this problem (disable r/w-allocate 3863 * for managed kernel mappings), but the bug is still evil enough 3864 * to consider this cache mode "experimental". 3865 */ 3866 pte_l1_s_cache_mode |= L1_S_XSCALE_TEX(TEX_XSCALE_X); 3867 pte_l2_l_cache_mode |= L2_XSCALE_L_TEX(TEX_XSCALE_X); 3868 pte_l2_s_cache_mode |= L2_XSCALE_T_TEX(TEX_XSCALE_X); 3869 #endif /* XSCALE_CACHE_READ_WRITE_ALLOCATE */ 3870 3871 #ifdef XSCALE_CACHE_WRITE_THROUGH 3872 /* 3873 * Some versions of the XScale core have various bugs in 3874 * their cache units, the work-around for which is to run 3875 * the cache in write-through mode. Unfortunately, this 3876 * has a major (negative) impact on performance. So, we 3877 * go ahead and run fast-and-loose, in the hopes that we 3878 * don't line up the planets in a way that will trip the 3879 * bugs. 3880 * 3881 * However, we give you the option to be slow-but-correct. 3882 */ 3883 pte_l1_s_cache_mode = L1_S_C; 3884 pte_l2_l_cache_mode = L2_C; 3885 pte_l2_s_cache_mode = L2_C; 3886 #endif /* XSCALE_CACHE_WRITE_THROUGH */ 3887 3888 pte_l2_s_prot_u = L2_S_PROT_U_xscale; 3889 pte_l2_s_prot_w = L2_S_PROT_W_xscale; 3890 pte_l2_s_prot_mask = L2_S_PROT_MASK_xscale; 3891 3892 pte_l1_s_proto = L1_S_PROTO_xscale; 3893 pte_l1_c_proto = L1_C_PROTO_xscale; 3894 pte_l2_s_proto = L2_S_PROTO_xscale; 3895 3896 pmap_copy_page_func = pmap_copy_page_xscale; 3897 pmap_zero_page_func = pmap_zero_page_xscale; 3898 3899 /* 3900 * Disable ECC protection of page table access, for now. 3901 */ 3902 __asm __volatile("mrc p15, 0, %0, c1, c0, 1" 3903 : "=r" (auxctl)); 3904 auxctl &= ~XSCALE_AUXCTL_P; 3905 __asm __volatile("mcr p15, 0, %0, c1, c0, 1" 3906 : 3907 : "r" (auxctl)); 3908 } 3909 3910 /* 3911 * xscale_setup_minidata: 3912 * 3913 * Set up the mini-data cache clean area. We require the 3914 * caller to allocate the right amount of physically and 3915 * virtually contiguous space. 3916 */ 3917 void 3918 xscale_setup_minidata(vaddr_t l1pt, vaddr_t va, paddr_t pa) 3919 { 3920 extern vaddr_t xscale_minidata_clean_addr; 3921 extern vsize_t xscale_minidata_clean_size; /* already initialized */ 3922 pd_entry_t *pde = (pd_entry_t *) l1pt; 3923 pt_entry_t *pte; 3924 vsize_t size; 3925 uint32_t auxctl; 3926 3927 xscale_minidata_clean_addr = va; 3928 3929 /* Round it to page size. */ 3930 size = (xscale_minidata_clean_size + L2_S_OFFSET) & L2_S_FRAME; 3931 3932 for (; size != 0; 3933 va += L2_S_SIZE, pa += L2_S_SIZE, size -= L2_S_SIZE) { 3934 pte = (pt_entry_t *) 3935 kernel_pt_lookup(pde[va >> L1_S_SHIFT] & L2_S_FRAME); 3936 if (pte == NULL) 3937 panic("xscale_setup_minidata: can't find L2 table for " 3938 "VA 0x%08lx", va); 3939 pte[(va >> PGSHIFT) & 0x3ff] = L2_S_PROTO | pa | 3940 L2_S_PROT(PTE_KERNEL, VM_PROT_READ) | 3941 L2_C | L2_XSCALE_T_TEX(TEX_XSCALE_X); 3942 } 3943 3944 /* 3945 * Configure the mini-data cache for write-back with 3946 * read/write-allocate. 3947 * 3948 * NOTE: In order to reconfigure the mini-data cache, we must 3949 * make sure it contains no valid data! In order to do that, 3950 * we must issue a global data cache invalidate command! 3951 * 3952 * WE ASSUME WE ARE RUNNING UN-CACHED WHEN THIS ROUTINE IS CALLED! 3953 * THIS IS VERY IMPORTANT! 3954 */ 3955 3956 /* Invalidate data and mini-data. */ 3957 __asm __volatile("mcr p15, 0, %0, c7, c6, 0" 3958 : 3959 : "r" (auxctl)); 3960 3961 3962 __asm __volatile("mrc p15, 0, %0, c1, c0, 1" 3963 : "=r" (auxctl)); 3964 auxctl = (auxctl & ~XSCALE_AUXCTL_MD_MASK) | XSCALE_AUXCTL_MD_WB_RWA; 3965 __asm __volatile("mcr p15, 0, %0, c1, c0, 1" 3966 : 3967 : "r" (auxctl)); 3968 } 3969 #endif /* ARM_MMU_XSCALE == 1 */ 3970
Indexes created Mon Sep 29 21:09:56 GMT 2025