1 /* $NetBSD: pmap_bootstrap.c,v 1.67 2026/04/05 14:35:49 thorpej Exp $ */ 2 3 /* 4 * Copyright (c) 1991, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * the Systems Programming Group of the University of Utah Computer 9 * Science Department. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)pmap_bootstrap.c 8.1 (Berkeley) 6/10/93 36 */ 37 38 #include <sys/cdefs.h> 39 __KERNEL_RCSID(0, "$NetBSD: pmap_bootstrap.c,v 1.67 2026/04/05 14:35:49 thorpej Exp $"); 40 41 #include "opt_m68k_arch.h" 42 43 #include <sys/param.h> 44 #include <sys/kcore.h> 45 #include <uvm/uvm_extern.h> 46 47 #include <machine/cpu.h> 48 #include <machine/pte.h> 49 #include <machine/vmparam.h> 50 51 #define RELOC(v, t) *((t*)((uintptr_t)&(v) + firstpa)) 52 53 extern char *etext; 54 55 extern vaddr_t kernel_reloc_offset; 56 57 /* 58 * Special purpose kernel virtual addresses, used for mapping 59 * physical pages for a variety of temporary or permanent purposes: 60 * 61 * CADDR1, CADDR2: pmap zero/copy operations 62 * vmmap: /dev/mem, crash dumps, parity error checking 63 * msgbufaddr: kernel message buffer 64 */ 65 void *CADDR1, *CADDR2; 66 char *vmmap; 67 extern void *msgbufaddr; 68 69 paddr_t pmap_bootstrap1(paddr_t, paddr_t); 70 71 /* 72 * Bootstrap the VM system. 73 * 74 * Called with MMU off so we must relocate all global references by `firstpa' 75 * (don't call any functions here!) `nextpa' is the first available physical 76 * memory address. Returns an updated first PA reflecting the memory we 77 * have allocated. MMU is still off when we return. 78 * 79 * XXX assumes sizeof(u_int) == sizeof(pt_entry_t) 80 * XXX a PIC compiler would make this much easier. 81 */ 82 paddr_t __attribute__((no_instrument_function)) 83 pmap_bootstrap1(paddr_t nextpa, paddr_t firstpa) 84 { 85 paddr_t lwp0upa, kstpa, kptmpa, kptpa; 86 u_int nptpages, kstsize; 87 st_entry_t protoste, *ste, *este; 88 pt_entry_t protopte, *pte, *epte; 89 u_int iiomappages; 90 #if defined(M68040) || defined(M68060) 91 int i; 92 u_int stfree = 0; /* XXX: gcc -Wuninitialized */ 93 #endif 94 95 nextpa = m68k_round_page(nextpa); 96 97 /* 98 * Calculate important physical addresses: 99 * 100 * lwp0upa lwp0 u-area UPAGES pages 101 * 102 * kstpa kernel segment table 1 page (!040) 103 * N pages (040) 104 * 105 * kptmpa kernel PT map 1 page 106 * 107 * kptpa statically allocated 108 * kernel PT pages Sysptsize+ pages 109 * 110 * [ Sysptsize is the number of pages of PT, and iiomappages is the 111 * number of PTEs, hence we need to round the total to a page 112 * boundary with IO maps at the end. ] 113 * 114 * The KVA corresponding to any of these PAs is: 115 * (PA - firstpa + KERNBASE). 116 */ 117 RELOC(kernel_reloc_offset, vaddr_t) = firstpa; 118 119 u_int intio_endpa = 120 RELOC(intiobase_phys, u_int) + RELOC(intiosize, u_int); 121 iiomappages = m68k_btop(intio_endpa - RELOC(intiobase_phys, u_int)); 122 123 lwp0upa = nextpa; 124 nextpa += USPACE; 125 #if defined(M68040) || defined(M68060) 126 if (RELOC(mmutype, int) == MMU_68040) 127 kstsize = MAXKL2SIZE / (NPTEPG/SG4_LEV2SIZE); 128 else 129 #endif 130 kstsize = 1; 131 kstpa = nextpa; 132 nextpa += kstsize * PAGE_SIZE; 133 kptmpa = nextpa; 134 nextpa += PAGE_SIZE; 135 kptpa = nextpa; 136 nptpages = RELOC(Sysptsize, int) + 137 howmany(RELOC(physmem, psize_t), NPTEPG) + 138 (iiomappages + NPTEPG - 1) / NPTEPG; 139 nextpa += nptpages * PAGE_SIZE; 140 141 /* 142 * Clear all PTEs to zero 143 */ 144 for (pte = (pt_entry_t *)kstpa; pte < (pt_entry_t *)nextpa; pte++) 145 *pte = 0; 146 147 /* 148 * Initialize segment table and kernel page table map. 149 * 150 * On 68030s and earlier MMUs the two are identical except for 151 * the valid bits so both are initialized with essentially the 152 * same values. On the 68040, which has a mandatory 3-level 153 * structure, the segment table holds the level 1 table and part 154 * (or all) of the level 2 table and hence is considerably 155 * different. Here the first level consists of 128 descriptors 156 * (512 bytes) each mapping 32mb of address space. Each of these 157 * points to blocks of 128 second level descriptors (512 bytes) 158 * each mapping 256kb. Note that there may be additional "segment 159 * table" pages depending on how large MAXKL2SIZE is. 160 * 161 * Portions of the last segment of KVA space (0xFFC00000 - 162 * 0xFFFFFFFF) are mapped for the kernel page tables. 163 * 164 * XXX cramming two levels of mapping into the single "segment" 165 * table on the 68040 is intended as a temporary hack to get things 166 * working. The 224mb of address space that this allows will most 167 * likely be insufficient in the future (at least for the kernel). 168 */ 169 #if defined(M68040) || defined(M68060) 170 if (RELOC(mmutype, int) == MMU_68040) { 171 int nl1desc, nl2desc; 172 173 /* 174 * First invalidate the entire "segment table" pages 175 * (levels 1 and 2 have the same "invalid" value). 176 */ 177 ste = (st_entry_t *)kstpa; 178 este = &ste[kstsize * NPTEPG]; 179 while (ste < este) 180 *ste++ = SG_NV; 181 /* 182 * Initialize level 2 descriptors (which immediately 183 * follow the level 1 table). We need: 184 * NPTEPG / SG4_LEV3SIZE 185 * level 2 descriptors to map each of the nptpages 186 * pages of PTEs. Note that we set the "used" bit 187 * now to save the HW the expense of doing it. 188 */ 189 nl2desc = nptpages * (NPTEPG / SG4_LEV3SIZE); 190 ste = (st_entry_t *)kstpa; 191 ste = &ste[SG4_LEV1SIZE]; 192 este = &ste[nl2desc]; 193 protoste = kptpa | SG_U | SG_RW | SG_V; 194 while (ste < este) { 195 *ste++ = protoste; 196 protoste += (SG4_LEV3SIZE * sizeof(st_entry_t)); 197 } 198 /* 199 * Initialize level 1 descriptors. We need: 200 * howmany(nl2desc, SG4_LEV2SIZE) 201 * level 1 descriptors to map the `nl2desc' level 2's. 202 */ 203 nl1desc = howmany(nl2desc, SG4_LEV2SIZE); 204 ste = (st_entry_t *)kstpa; 205 este = &ste[nl1desc]; 206 protoste = (paddr_t)&ste[SG4_LEV1SIZE] | SG_U | SG_RW | SG_V; 207 while (ste < este) { 208 *ste++ = protoste; 209 protoste += (SG4_LEV2SIZE * sizeof(st_entry_t)); 210 } 211 /* 212 * Initialize the final level 1 descriptor to map the next 213 * block of level 2 descriptors for Sysptmap. 214 */ 215 ste = (st_entry_t *)kstpa; 216 ste = &ste[SG4_LEV1SIZE - 1]; 217 *ste = protoste; 218 /* 219 * Now initialize the final portion of that block of 220 * descriptors to map Sysmap. 221 */ 222 i = SG4_LEV1SIZE + (nl1desc * SG4_LEV2SIZE); 223 ste = (st_entry_t *)kstpa; 224 ste = &ste[i + SG4_LEV2SIZE - (NPTEPG / SG4_LEV3SIZE)]; 225 este = &ste[NPTEPG / SG4_LEV3SIZE]; 226 protoste = kptmpa | SG_U | SG_RW | SG_V; 227 while (ste < este) { 228 *ste++ = protoste; 229 protoste += (SG4_LEV3SIZE * sizeof(st_entry_t)); 230 } 231 /* 232 * Calculate the free level 2 descriptor mask 233 * noting that we have used: 234 * 0: level 1 table 235 * 1 to nl1desc: map page tables 236 * nl1desc + 1: maps kptmpa and last-page page table 237 */ 238 /* mark an entry for level 1 table */ 239 stfree = ~l2tobm(0); 240 /* mark entries for map page tables */ 241 for (i = 1; i <= nl1desc; i++) 242 stfree &= ~l2tobm(i); 243 /* mark an entry for kptmpa and lkptpa */ 244 stfree &= ~l2tobm(i); 245 /* mark entries not available */ 246 for (i = MAXKL2SIZE; i < sizeof(stfree) * NBBY; i++) 247 stfree &= ~l2tobm(i); 248 249 /* 250 * Initialize Sysptmap 251 */ 252 pte = (pt_entry_t *)kptmpa; 253 epte = &pte[nptpages]; 254 protopte = kptpa | PG_RW | PG_CI | PG_U | PG_V; 255 while (pte < epte) { 256 *pte++ = protopte; 257 protopte += PAGE_SIZE; 258 } 259 /* 260 * Invalidate all remaining entries. 261 */ 262 epte = (pt_entry_t *)kptmpa; 263 epte = &epte[TIB_SIZE]; 264 while (pte < epte) { 265 *pte++ = PG_NV; 266 } 267 /* 268 * Initialize the last one to point to Sysptmap. 269 */ 270 pte = (pt_entry_t *)kptmpa; 271 pte = &pte[SYSMAP_VA >> SEGSHIFT]; 272 *pte = kptmpa | PG_RW | PG_CI | PG_V; 273 } else 274 #endif /* M68040 || M68060 */ 275 { 276 /* 277 * Map the page table pages in both the HW segment table 278 * and the software Sysptmap. 279 */ 280 ste = (st_entry_t *)kstpa; 281 pte = (pt_entry_t *)kptmpa; 282 epte = &pte[nptpages]; 283 protoste = kptpa | SG_RW | SG_V; 284 protopte = kptpa | PG_RW | PG_CI | PG_V; 285 while (pte < epte) { 286 *ste++ = protoste; 287 *pte++ = protopte; 288 protoste += PAGE_SIZE; 289 protopte += PAGE_SIZE; 290 } 291 /* 292 * Invalidate all remaining entries in both. 293 */ 294 este = (st_entry_t *)kstpa; 295 este = &este[TIA_SIZE]; 296 while (ste < este) 297 *ste++ = SG_NV; 298 epte = (pt_entry_t *)kptmpa; 299 epte = &epte[TIB_SIZE]; 300 while (pte < epte) 301 *pte++ = PG_NV; 302 /* 303 * Initialize the last one to point to Sysptmap. 304 */ 305 ste = (st_entry_t *)kstpa; 306 ste = &ste[SYSMAP_VA >> SEGSHIFT]; 307 pte = (pt_entry_t *)kptmpa; 308 pte = &pte[SYSMAP_VA >> SEGSHIFT]; 309 *ste = kptmpa | SG_RW | SG_V; 310 *pte = kptmpa | PG_RW | PG_CI | PG_V; 311 } 312 313 /* 314 * Initialize kernel page table. 315 * Start by invalidating the `nptpages' that we have allocated. 316 */ 317 pte = (pt_entry_t *)kptpa; 318 epte = &pte[nptpages * NPTEPG]; 319 while (pte < epte) 320 *pte++ = PG_NV; 321 /* 322 * Validate PTEs for kernel text (RO). 323 */ 324 pte = (pt_entry_t *)kptpa; 325 pte = &pte[m68k_btop(KERNBASE)]; 326 epte = &pte[m68k_btop(m68k_trunc_page(&etext))]; 327 protopte = firstpa | PG_RO | PG_U | PG_V; 328 while (pte < epte) { 329 *pte++ = protopte; 330 protopte += PAGE_SIZE; 331 } 332 /* 333 * Validate PTEs for kernel data/bss, dynamic data allocated 334 * by us so far (kstpa - firstpa bytes), and pages for lwp0 335 * u-area and page table allocated below (RW). 336 */ 337 epte = (pt_entry_t *)kptpa; 338 epte = &epte[m68k_btop(kstpa - firstpa)]; 339 protopte = (protopte & ~PG_PROT) | PG_RW; 340 /* 341 * Enable copy-back caching of data pages 342 */ 343 if (RELOC(mmutype, int) == MMU_68040) 344 protopte |= PG_CCB; 345 while (pte < epte) { 346 *pte++ = protopte; 347 protopte += PAGE_SIZE; 348 } 349 /* 350 * Map the kernel segment table cache invalidated for 68040/68060. 351 * (for the 68040 not strictly necessary, but recommended by Motorola; 352 * for the 68060 mandatory) 353 */ 354 epte = (pt_entry_t *)kptpa; 355 epte = &epte[m68k_btop(nextpa - firstpa)]; 356 protopte = (protopte & ~PG_PROT) | PG_RW; 357 if (RELOC(mmutype, int) == MMU_68040) { 358 protopte &= ~PG_CMASK; 359 protopte |= PG_CI; 360 } 361 while (pte < epte) { 362 *pte++ = protopte; 363 protopte += PAGE_SIZE; 364 } 365 366 /* 367 * Finally, validate the internal IO space PTEs (RW+CI). 368 */ 369 370 #define PTE2VA(pte) m68k_ptob(pte - ((pt_entry_t *)kptpa)) 371 372 protopte = RELOC(intiobase_phys, u_int) | PG_RW | PG_CI | PG_U | PG_V; 373 epte = &pte[iiomappages]; 374 RELOC(intiobase, uint8_t *) = (uint8_t *)PTE2VA(pte); 375 while (pte < epte) { 376 *pte++ = protopte; 377 protopte += PAGE_SIZE; 378 } 379 RELOC(virtual_avail, vaddr_t) = PTE2VA(pte); 380 381 /* 382 * Calculate important exported kernel addresses and related values. 383 */ 384 /* 385 * Sysseg: base of kernel segment table 386 */ 387 RELOC(Sysseg, st_entry_t *) = (st_entry_t *)(kstpa - firstpa); 388 RELOC(Sysseg_pa, paddr_t) = kstpa; 389 #if defined(M68040) || defined(M68060) 390 if (RELOC(mmutype, int) == MMU_68040) 391 RELOC(protostfree, u_int) = stfree; 392 #endif 393 /* 394 * Sysptmap: base of kernel page table map 395 */ 396 RELOC(Sysptmap, pt_entry_t *) = (pt_entry_t *)(kptmpa - firstpa); 397 /* 398 * Sysmap: kernel page table (as mapped through Sysptmap) 399 * Allocated at the end of KVA space. 400 */ 401 RELOC(Sysmap, pt_entry_t *) = (pt_entry_t *)SYSMAP_VA; 402 403 /* 404 * Remember the u-area address so it can be loaded in the lwp0 405 * via uvm_lwp_setuarea() later in pmap_bootstrap2(). 406 */ 407 RELOC(lwp0uarea, vaddr_t) = lwp0upa - firstpa; 408 409 RELOC(virtual_end, vaddr_t) = VM_MAX_KERNEL_ADDRESS; 410 411 /* 412 * Allocate some fixed, special purpose kernel virtual addresses 413 */ 414 { 415 vaddr_t va = RELOC(virtual_avail, vaddr_t); 416 417 RELOC(CADDR1, void *) = (void *)va; 418 va += PAGE_SIZE; 419 RELOC(CADDR2, void *) = (void *)va; 420 va += PAGE_SIZE; 421 RELOC(vmmap, void *) = (void *)va; 422 va += PAGE_SIZE; 423 RELOC(msgbufaddr, void *) = (void *)va; 424 va += m68k_round_page(MSGBUFSIZE); 425 RELOC(virtual_avail, vaddr_t) = va; 426 } 427 428 return nextpa; 429 } 430
Indexes created Sun Oct 25 00:26:45 UTC 2026