1 /* $NetBSD: pmap_bootstrap.c,v 1.75 2008/12/28 05:15:59 tsutsui 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 1.75 2008/12/28 05:15:59 tsutsui Exp $"); 40 41 #include "opt_ddb.h" 42 #include "opt_kgdb.h" 43 #include "zsc.h" 44 45 #include <sys/param.h> 46 #include <sys/systm.h> 47 #include <sys/reboot.h> 48 49 #include <uvm/uvm_extern.h> 50 51 #include <machine/pte.h> 52 #include <machine/vmparam.h> 53 #include <machine/cpu.h> 54 #include <machine/pmap.h> 55 #include <machine/autoconf.h> 56 #include <machine/video.h> 57 58 #include <mac68k/mac68k/macrom.h> 59 60 #define PA2VA(v, t) (t)((u_int)(v) - firstpa) 61 62 extern char *etext; 63 extern int Sysptsize; 64 extern char *extiobase, *proc0paddr; 65 extern st_entry_t *Sysseg; 66 extern pt_entry_t *Sysptmap, *Sysmap; 67 68 extern int physmem; 69 extern paddr_t avail_start; 70 extern paddr_t avail_end; 71 extern vaddr_t virtual_avail, virtual_end; 72 extern vsize_t mem_size; 73 extern int protection_codes[]; 74 75 #if NZSC > 0 76 extern int zsinited; 77 #endif 78 79 /* 80 * These are used to map the RAM: 81 */ 82 int numranges; /* = 0 == don't use the ranges */ 83 u_long low[8]; 84 u_long high[8]; 85 u_long maxaddr; /* PA of the last physical page */ 86 int vidlen; 87 #define VIDMAPSIZE btoc(vidlen) 88 static vaddr_t newvideoaddr; 89 90 extern void * ROMBase; 91 92 /* 93 * Special purpose kernel virtual addresses, used for mapping 94 * physical pages for a variety of temporary or permanent purposes: 95 * 96 * CADDR1, CADDR2: pmap zero/copy operations 97 * vmmap: /dev/mem, crash dumps, parity error checking 98 * msgbufaddr: kernel message buffer 99 */ 100 void *CADDR1, *CADDR2; 101 char *vmmap; 102 void *msgbufaddr; 103 104 void pmap_bootstrap(paddr_t, paddr_t); 105 void bootstrap_mac68k(int); 106 107 /* 108 * Bootstrap the VM system. 109 * 110 * This is called with the MMU either on or off. If it's on, we assume 111 * that it's mapped with the same PA <=> LA mapping that we eventually 112 * want. The page sizes and the protections will be wrong, anyway. 113 * 114 * nextpa is the first address following the loaded kernel. On a IIsi 115 * on 12 May 1996, that was 0xf9000 beyond firstpa. 116 */ 117 void 118 pmap_bootstrap(paddr_t nextpa, paddr_t firstpa) 119 { 120 paddr_t kstpa, kptpa, kptmpa, lkptpa, p0upa; 121 u_int nptpages, kstsize; 122 paddr_t avail_next; 123 int avail_remaining; 124 int avail_range; 125 int i; 126 st_entry_t protoste, *ste; 127 pt_entry_t protopte, *pte, *epte; 128 extern char start[]; 129 130 vidlen = m68k_round_page(mac68k_video.mv_height * 131 mac68k_video.mv_stride + m68k_page_offset(mac68k_video.mv_phys)); 132 133 /* 134 * Calculate important physical addresses: 135 * 136 * kstpa kernel segment table 1 page (!040) 137 * N pages (040) 138 * 139 * kptpa statically allocated 140 * kernel PT pages Sysptsize+ pages 141 * 142 * [ Sysptsize is the number of pages of PT, IIOMAPSIZE and 143 * NBMAPSIZE are the number of PTEs, hence we need to round 144 * the total to a page boundary with IO maps at the end. ] 145 * 146 * kptmpa kernel PT map 1 page 147 * 148 * lkptpa last kernel PT page 1 page 149 * 150 * p0upa proc 0 u-area UPAGES pages 151 * 152 */ 153 if (mmutype == MMU_68040) 154 kstsize = MAXKL2SIZE / (NPTEPG/SG4_LEV2SIZE); 155 else 156 kstsize = 1; 157 kstpa = nextpa; 158 nextpa += kstsize * PAGE_SIZE; 159 kptmpa = nextpa; 160 nextpa += PAGE_SIZE; 161 lkptpa = nextpa; 162 nextpa += PAGE_SIZE; 163 p0upa = nextpa; 164 nextpa += USPACE; 165 kptpa = nextpa; 166 nptpages = Sysptsize + 167 (IIOMAPSIZE + ROMMAPSIZE + VIDMAPSIZE + NPTEPG - 1) / NPTEPG; 168 nextpa += nptpages * PAGE_SIZE; 169 170 for (i = 0; i < numranges; i++) 171 if (low[i] <= firstpa && firstpa < high[i]) 172 break; 173 if (i >= numranges || nextpa > high[i]) { 174 if (mac68k_machine.do_graybars) { 175 printf("Failure in NetBSD boot; "); 176 if (i < numranges) 177 printf("nextpa=0x%lx, high[%d]=0x%lx.\n", 178 nextpa, i, high[i]); 179 else 180 printf("can't find kernel RAM segment.\n"); 181 printf("You're hosed! Try booting with 32-bit "); 182 printf("addressing enabled in the memory control "); 183 printf("panel.\n"); 184 printf("Older machines may need Mode32 to get that "); 185 printf("option.\n"); 186 } 187 panic("Cannot work with the current memory mappings."); 188 } 189 190 /* 191 * Initialize segment table and kernel page table map. 192 * 193 * On 68030s and earlier MMUs the two are identical except for 194 * the valid bits so both are initialized with essentially the 195 * same values. On the 68040, which has a mandatory 3-level 196 * structure, the segment table holds the level 1 table and part 197 * (or all) of the level 2 table and hence is considerably 198 * different. Here the first level consists of 128 descriptors 199 * (512 bytes) each mapping 32mb of address space. Each of these 200 * points to blocks of 128 second level descriptors (512 bytes) 201 * each mapping 256kb. Note that there may be additional "segment 202 * table" pages depending on how large MAXKL2SIZE is. 203 * 204 * XXX cramming two levels of mapping into the single "segment" 205 * table on the 68040 is intended as a temporary hack to get things 206 * working. The 224mb of address space that this allows will most 207 * likely be insufficient in the future (at least for the kernel). 208 */ 209 if (mmutype == MMU_68040) { 210 int num; 211 212 /* 213 * First invalidate the entire "segment table" pages 214 * (levels 1 and 2 have the same "invalid" value). 215 */ 216 pte = PA2VA(kstpa, u_int *); 217 epte = &pte[kstsize * NPTEPG]; 218 while (pte < epte) 219 *pte++ = SG_NV; 220 /* 221 * Initialize level 2 descriptors (which immediately 222 * follow the level 1 table). We need: 223 * NPTEPG / SG4_LEV3SIZE 224 * level 2 descriptors to map each of the nptpages 225 * pages of PTEs. Note that we set the "used" bit 226 * now to save the HW the expense of doing it. 227 */ 228 num = nptpages * (NPTEPG / SG4_LEV3SIZE); 229 pte = &(PA2VA(kstpa, u_int *))[SG4_LEV1SIZE]; 230 epte = &pte[num]; 231 protoste = kptpa | SG_U | SG_RW | SG_V; 232 while (pte < epte) { 233 *pte++ = protoste; 234 protoste += (SG4_LEV3SIZE * sizeof(st_entry_t)); 235 } 236 /* 237 * Initialize level 1 descriptors. We need: 238 * roundup(num, SG4_LEV2SIZE) / SG4_LEV2SIZE 239 * level 1 descriptors to map the `num' level 2's. 240 */ 241 pte = PA2VA(kstpa, u_int *); 242 epte = &pte[roundup(num, SG4_LEV2SIZE) / SG4_LEV2SIZE]; 243 protoste = (u_int)&pte[SG4_LEV1SIZE] | SG_U | SG_RW | SG_V; 244 while (pte < epte) { 245 *pte++ = protoste; 246 protoste += (SG4_LEV2SIZE * sizeof(st_entry_t)); 247 } 248 /* 249 * Initialize the final level 1 descriptor to map the last 250 * block of level 2 descriptors. 251 */ 252 ste = &(PA2VA(kstpa, u_int*))[SG4_LEV1SIZE-1]; 253 pte = &(PA2VA(kstpa, u_int*))[kstsize*NPTEPG - SG4_LEV2SIZE]; 254 *ste = (u_int)pte | SG_U | SG_RW | SG_V; 255 /* 256 * Now initialize the final portion of that block of 257 * descriptors to map kptmpa and the "last PT page". 258 */ 259 pte = &(PA2VA(kstpa, u_int*)) 260 [kstsize*NPTEPG - NPTEPG/SG4_LEV3SIZE*2]; 261 epte = &pte[NPTEPG/SG4_LEV3SIZE]; 262 protoste = kptmpa | SG_U | SG_RW | SG_V; 263 while (pte < epte) { 264 *pte++ = protoste; 265 protoste += (SG4_LEV3SIZE * sizeof(st_entry_t)); 266 } 267 epte = &pte[NPTEPG/SG4_LEV3SIZE]; 268 protoste = lkptpa | SG_U | SG_RW | SG_V; 269 while (pte < epte) { 270 *pte++ = protoste; 271 protoste += (SG4_LEV3SIZE * sizeof(st_entry_t)); 272 } 273 /* 274 * Initialize Sysptmap 275 */ 276 pte = PA2VA(kptmpa, u_int *); 277 epte = &pte[nptpages]; 278 protopte = kptpa | PG_RW | PG_CI | PG_V; 279 while (pte < epte) { 280 *pte++ = protopte; 281 protopte += PAGE_SIZE; 282 } 283 /* 284 * Invalidate all but the last two remaining entries. 285 */ 286 epte = &(PA2VA(kptmpa, u_int *))[NPTEPG-2]; 287 while (pte < epte) { 288 *pte++ = PG_NV; 289 } 290 /* 291 * Initialize the last ones to point to Sysptmap and the page 292 * table page allocated earlier. 293 */ 294 *pte = kptmpa | PG_RW | PG_CI | PG_V; 295 pte++; 296 *pte = lkptpa | PG_RW | PG_CI | PG_V; 297 } else { 298 /* 299 * Map the page table pages in both the HW segment table 300 * and the software Sysptmap. 301 */ 302 ste = PA2VA(kstpa, u_int*); 303 pte = PA2VA(kptmpa, u_int*); 304 epte = &pte[nptpages]; 305 protoste = kptpa | SG_RW | SG_V; 306 protopte = kptpa | PG_RW | PG_CI | PG_V; 307 while (pte < epte) { 308 *ste++ = protoste; 309 *pte++ = protopte; 310 protoste += PAGE_SIZE; 311 protopte += PAGE_SIZE; 312 } 313 /* 314 * Invalidate all but the last two remaining entries in both. 315 */ 316 epte = &(PA2VA(kptmpa, u_int *))[NPTEPG-2]; 317 while (pte < epte) { 318 *ste++ = SG_NV; 319 *pte++ = PG_NV; 320 } 321 /* 322 * Initialize the last ones to point to Sysptmap and the page 323 * table page allocated earlier. 324 */ 325 *ste = kptmpa | SG_RW | SG_V; 326 *pte = kptmpa | PG_RW | PG_CI | PG_V; 327 ste++; 328 pte++; 329 *ste = lkptpa | SG_RW | SG_V; 330 *pte = lkptpa | PG_RW | PG_CI | PG_V; 331 } 332 /* 333 * Invalidate all entries in the last kernel PT page 334 * (u-area PTEs will be validated later). 335 */ 336 pte = PA2VA(lkptpa, u_int *); 337 epte = &pte[NPTEPG]; 338 while (pte < epte) 339 *pte++ = PG_NV; 340 341 /* 342 * Initialize kernel page table. 343 * Start by invalidating the `nptpages' that we have allocated. 344 */ 345 pte = PA2VA(kptpa, u_int *); 346 epte = &pte[nptpages * NPTEPG]; 347 while (pte < epte) 348 *pte++ = PG_NV; 349 350 /* 351 * Validate PTEs for kernel text (RO). 352 * Pages up to "start" must be writable for the ROM. 353 */ 354 pte = &(PA2VA(kptpa, u_int *))[m68k_btop(KERNBASE)]; 355 /* XXX why KERNBASE relative? */ 356 epte = &pte[m68k_btop(m68k_round_page(start))]; 357 protopte = firstpa | PG_RW | PG_V; 358 while (pte < epte) { 359 *pte++ = protopte; 360 protopte += PAGE_SIZE; 361 } 362 /* XXX why KERNBASE relative? */ 363 epte = &pte[m68k_btop(m68k_trunc_page(&etext))]; 364 protopte = (protopte & ~PG_PROT) | PG_RO; 365 while (pte < epte) { 366 *pte++ = protopte; 367 protopte += PAGE_SIZE; 368 } 369 /* 370 * Validate PTEs for kernel data/bss, dynamic data allocated 371 * by us so far (nextpa - firstpa bytes), and pages for proc0 372 * u-area and page table allocated below (RW). 373 */ 374 epte = &(PA2VA(kptpa, u_int *))[m68k_btop(nextpa - firstpa)]; 375 protopte = (protopte & ~PG_PROT) | PG_RW; 376 /* 377 * Enable copy-back caching of data pages 378 */ 379 if (mmutype == MMU_68040) 380 protopte |= PG_CCB; 381 while (pte < epte) { 382 *pte++ = protopte; 383 protopte += PAGE_SIZE; 384 } 385 386 #define PTE2VA(pte) m68k_ptob(pte - PA2VA(kptpa, pt_entry_t *)) 387 388 protopte = IOBase | PG_RW | PG_CI | PG_V; 389 IOBase = PTE2VA(pte); 390 epte = &pte[IIOMAPSIZE]; 391 while (pte < epte) { 392 *pte++ = protopte; 393 protopte += PAGE_SIZE; 394 } 395 396 protopte = (pt_entry_t)ROMBase | PG_RO | PG_V; 397 ROMBase = (void *)PTE2VA(pte); 398 epte = &pte[ROMMAPSIZE]; 399 while (pte < epte) { 400 *pte++ = protopte; 401 protopte += PAGE_SIZE; 402 } 403 404 if (vidlen) { 405 protopte = m68k_trunc_page(mac68k_video.mv_phys) | 406 PG_RW | PG_V | PG_CI; 407 newvideoaddr = PTE2VA(pte) 408 + m68k_page_offset(mac68k_video.mv_phys); 409 epte = &pte[VIDMAPSIZE]; 410 while (pte < epte) { 411 *pte++ = protopte; 412 protopte += PAGE_SIZE; 413 } 414 } 415 virtual_avail = PTE2VA(pte); 416 417 /* 418 * Calculate important exported kernel virtual addresses 419 */ 420 /* 421 * Sysseg: base of kernel segment table 422 */ 423 Sysseg = PA2VA(kstpa, st_entry_t *); 424 /* 425 * Sysptmap: base of kernel page table map 426 */ 427 Sysptmap = PA2VA(kptmpa, pt_entry_t *); 428 /* 429 * Sysmap: kernel page table (as mapped through Sysptmap) 430 * Allocated at the end of KVA space. 431 */ 432 Sysmap = (pt_entry_t *)m68k_ptob((NPTEPG - 2) * NPTEPG); 433 434 /* 435 * Setup u-area for process 0. 436 */ 437 /* 438 * Zero the u-area. 439 * NOTE: `pte' and `epte' aren't PTEs here. 440 */ 441 pte = PA2VA(p0upa, u_int *); 442 epte = (u_int *)(PA2VA(p0upa, u_int) + USPACE); 443 while (pte < epte) 444 *pte++ = 0; 445 /* 446 * Remember the u-area address so it can be loaded in the 447 * proc struct p_addr field later. 448 */ 449 proc0paddr = PA2VA(p0upa, char *); 450 451 /* 452 * VM data structures are now initialized, set up data for 453 * the pmap module. 454 * 455 * Note about avail_end: msgbuf is initialized just after 456 * avail_end in machdep.c. Since the last page is used 457 * for rebooting the system (code is copied there and 458 * excution continues from copied code before the MMU 459 * is disabled), the msgbuf will get trounced between 460 * reboots if it's placed in the last physical page. 461 * To work around this, we move avail_end back one more 462 * page so the msgbuf can be preserved. 463 */ 464 avail_next = avail_start = m68k_round_page(nextpa); 465 avail_remaining = 0; 466 avail_range = -1; 467 for (i = 0; i < numranges; i++) { 468 if (low[i] <= avail_next && avail_next < high[i]) { 469 avail_range = i; 470 avail_remaining = high[i] - avail_next; 471 } else if (avail_range != -1) { 472 avail_remaining += (high[i] - low[i]); 473 } 474 } 475 physmem = m68k_btop(avail_remaining + nextpa - firstpa); 476 477 maxaddr = high[numranges - 1] - m68k_ptob(1); 478 high[numranges - 1] -= (m68k_round_page(MSGBUFSIZE) + m68k_ptob(1)); 479 avail_end = high[numranges - 1]; 480 mem_size = m68k_ptob(physmem); 481 virtual_end = VM_MAX_KERNEL_ADDRESS; 482 483 /* 484 * Initialize protection array. 485 * XXX don't use a switch statement, it might produce an 486 * absolute "jmp" table. 487 */ 488 { 489 int *kp; 490 491 kp = (int *)&protection_codes; 492 kp[VM_PROT_NONE|VM_PROT_NONE|VM_PROT_NONE] = 0; 493 kp[VM_PROT_READ|VM_PROT_NONE|VM_PROT_NONE] = PG_RO; 494 kp[VM_PROT_READ|VM_PROT_NONE|VM_PROT_EXECUTE] = PG_RO; 495 kp[VM_PROT_NONE|VM_PROT_NONE|VM_PROT_EXECUTE] = PG_RO; 496 kp[VM_PROT_NONE|VM_PROT_WRITE|VM_PROT_NONE] = PG_RW; 497 kp[VM_PROT_NONE|VM_PROT_WRITE|VM_PROT_EXECUTE] = PG_RW; 498 kp[VM_PROT_READ|VM_PROT_WRITE|VM_PROT_NONE] = PG_RW; 499 kp[VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE] = PG_RW; 500 } 501 502 /* 503 * Kernel page/segment table allocated above, 504 * just initialize pointers. 505 */ 506 { 507 struct pmap *kpm = kernel_pmap_ptr; 508 509 kpm->pm_stab = Sysseg; 510 kpm->pm_ptab = Sysmap; 511 simple_lock_init(&kpm->pm_lock); 512 kpm->pm_count = 1; 513 kpm->pm_stpa = (st_entry_t *)kstpa; 514 /* 515 * For the 040 we also initialize the free level 2 516 * descriptor mask noting that we have used: 517 * 0: level 1 table 518 * 1 to `num': map page tables 519 * MAXKL2SIZE-1: maps kptmpa and last-page page table 520 */ 521 if (mmutype == MMU_68040) { 522 int num; 523 524 kpm->pm_stfree = ~l2tobm(0); 525 num = roundup(nptpages * (NPTEPG / SG4_LEV3SIZE), 526 SG4_LEV2SIZE) / SG4_LEV2SIZE; 527 while (num) 528 kpm->pm_stfree &= ~l2tobm(num--); 529 kpm->pm_stfree &= ~l2tobm(MAXKL2SIZE-1); 530 for (num = MAXKL2SIZE; 531 num < sizeof(kpm->pm_stfree)*NBBY; 532 num++) 533 kpm->pm_stfree &= ~l2tobm(num); 534 } 535 } 536 537 /* 538 * Allocate some fixed, special purpose kernel virtual addresses 539 */ 540 { 541 vaddr_t va = virtual_avail; 542 543 CADDR1 = (void *)va; 544 va += PAGE_SIZE; 545 CADDR2 = (void *)va; 546 va += PAGE_SIZE; 547 vmmap = (void *)va; 548 va += PAGE_SIZE; 549 msgbufaddr = (void *)va; 550 va += m68k_round_page(MSGBUFSIZE); 551 virtual_avail = va; 552 } 553 } 554 555 void 556 bootstrap_mac68k(int tc) 557 { 558 #if NZSC > 0 559 extern void zs_init(void); 560 #endif 561 extern int *esym; 562 paddr_t nextpa; 563 void *oldROMBase; 564 565 if (mac68k_machine.do_graybars) 566 printf("Bootstrapping NetBSD/mac68k.\n"); 567 568 oldROMBase = ROMBase; 569 mac68k_video.mv_phys = mac68k_video.mv_kvaddr; 570 571 if (((tc & 0x80000000) && (mmutype == MMU_68030)) || 572 ((tc & 0x8000) && (mmutype == MMU_68040))) { 573 if (mac68k_machine.do_graybars) 574 printf("Getting mapping from MMU.\n"); 575 (void) get_mapping(); 576 if (mac68k_machine.do_graybars) 577 printf("Done.\n"); 578 } else { 579 /* MMU not enabled. Fake up ranges. */ 580 numranges = 1; 581 low[0] = 0; 582 high[0] = mac68k_machine.mach_memsize * (1024 * 1024); 583 if (mac68k_machine.do_graybars) 584 printf("Faked range to byte 0x%lx.\n", high[0]); 585 } 586 nextpa = load_addr + m68k_round_page(esym); 587 588 if (mac68k_machine.do_graybars) 589 printf("Bootstrapping the pmap system.\n"); 590 591 pmap_bootstrap(nextpa, load_addr); 592 593 if (mac68k_machine.do_graybars) 594 printf("Pmap bootstrapped.\n"); 595 596 if (!vidlen) 597 panic("Don't know how to relocate video!"); 598 599 if (mac68k_machine.do_graybars) 600 printf("Moving ROMBase from %p to %p.\n", oldROMBase, ROMBase); 601 602 mrg_fixupROMBase(oldROMBase, ROMBase); 603 604 if (mac68k_machine.do_graybars) 605 printf("Video address 0x%p -> 0x%p.\n", 606 (void *)mac68k_video.mv_kvaddr, (void *)newvideoaddr); 607 608 mac68k_set_io_offsets(IOBase); 609 610 /* 611 * If the serial ports are going (for console or 'echo'), then 612 * we need to make sure the IO change gets propagated properly. 613 * This resets the base addresses for the 8530 (serial) driver. 614 * 615 * WARNING!!! No printfs() (etc) BETWEEN zs_init() and the end 616 * of this function (where we start using the MMU, so the new 617 * address is correct. 618 */ 619 #if NZSC > 0 620 if (zsinited != 0) 621 zs_init(); 622 #endif 623 624 mac68k_video.mv_kvaddr = newvideoaddr; 625 } 626