1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * srmmu.c: SRMMU specific routines for memory management. 4 * 5 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) 6 * Copyright (C) 1995,2002 Pete Zaitcev (zaitcev@yahoo.com) 7 * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be) 8 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) 9 * Copyright (C) 1999,2000 Anton Blanchard (anton@samba.org) 10 */ 11 12 #include <linux/seq_file.h> 13 #include <linux/spinlock.h> 14 #include <linux/memblock.h> 15 #include <linux/pagemap.h> 16 #include <linux/vmalloc.h> 17 #include <linux/kdebug.h> 18 #include <linux/export.h> 19 #include <linux/kernel.h> 20 #include <linux/init.h> 21 #include <linux/log2.h> 22 #include <linux/gfp.h> 23 #include <linux/fs.h> 24 #include <linux/mm.h> 25 26 #include <asm/mmu_context.h> 27 #include <asm/cacheflush.h> 28 #include <asm/tlbflush.h> 29 #include <asm/io-unit.h> 30 #include <asm/pgalloc.h> 31 #include <asm/pgtable.h> 32 #include <asm/bitext.h> 33 #include <asm/vaddrs.h> 34 #include <asm/cache.h> 35 #include <asm/traps.h> 36 #include <asm/oplib.h> 37 #include <asm/mbus.h> 38 #include <asm/page.h> 39 #include <asm/asi.h> 40 #include <asm/smp.h> 41 #include <asm/io.h> 42 43 /* Now the cpu specific definitions. */ 44 #include <asm/turbosparc.h> 45 #include <asm/tsunami.h> 46 #include <asm/viking.h> 47 #include <asm/swift.h> 48 #include <asm/leon.h> 49 #include <asm/mxcc.h> 50 #include <asm/ross.h> 51 52 #include "mm_32.h" 53 54 enum mbus_module srmmu_modtype; 55 static unsigned int hwbug_bitmask; 56 int vac_cache_size; 57 EXPORT_SYMBOL(vac_cache_size); 58 int vac_line_size; 59 60 extern struct resource sparc_iomap; 61 62 extern unsigned long last_valid_pfn; 63 64 static pgd_t *srmmu_swapper_pg_dir; 65 66 const struct sparc32_cachetlb_ops *sparc32_cachetlb_ops; 67 EXPORT_SYMBOL(sparc32_cachetlb_ops); 68 69 #ifdef CONFIG_SMP 70 const struct sparc32_cachetlb_ops *local_ops; 71 72 #define FLUSH_BEGIN(mm) 73 #define FLUSH_END 74 #else 75 #define FLUSH_BEGIN(mm) if ((mm)->context != NO_CONTEXT) { 76 #define FLUSH_END } 77 #endif 78 79 int flush_page_for_dma_global = 1; 80 81 char *srmmu_name; 82 83 ctxd_t *srmmu_ctx_table_phys; 84 static ctxd_t *srmmu_context_table; 85 86 int viking_mxcc_present; 87 static DEFINE_SPINLOCK(srmmu_context_spinlock); 88 89 static int is_hypersparc; 90 91 static int srmmu_cache_pagetables; 92 93 /* these will be initialized in srmmu_nocache_calcsize() */ 94 static unsigned long srmmu_nocache_size; 95 static unsigned long srmmu_nocache_end; 96 97 /* 1 bit <=> 256 bytes of nocache <=> 64 PTEs */ 98 #define SRMMU_NOCACHE_BITMAP_SHIFT (PAGE_SHIFT - 4) 99 100 /* The context table is a nocache user with the biggest alignment needs. */ 101 #define SRMMU_NOCACHE_ALIGN_MAX (sizeof(ctxd_t)*SRMMU_MAX_CONTEXTS) 102 103 void *srmmu_nocache_pool; 104 static struct bit_map srmmu_nocache_map; 105 106 static inline int srmmu_pmd_none(pmd_t pmd) 107 { return !(pmd_val(pmd) & 0xFFFFFFF); } 108 109 /* XXX should we hyper_flush_whole_icache here - Anton */ 110 static inline void srmmu_ctxd_set(ctxd_t *ctxp, pgd_t *pgdp) 111 { 112 pte_t pte; 113 114 pte = __pte((SRMMU_ET_PTD | (__nocache_pa(pgdp) >> 4))); 115 set_pte((pte_t *)ctxp, pte); 116 } 117 118 /* 119 * Locations of MSI Registers. 120 */ 121 #define MSI_MBUS_ARBEN 0xe0001008 /* MBus Arbiter Enable register */ 122 123 /* 124 * Useful bits in the MSI Registers. 125 */ 126 #define MSI_ASYNC_MODE 0x80000000 /* Operate the MSI asynchronously */ 127 128 static void msi_set_sync(void) 129 { 130 __asm__ __volatile__ ("lda [%0] %1, %%g3\n\t" 131 "andn %%g3, %2, %%g3\n\t" 132 "sta %%g3, [%0] %1\n\t" : : 133 "r" (MSI_MBUS_ARBEN), 134 "i" (ASI_M_CTL), "r" (MSI_ASYNC_MODE) : "g3"); 135 } 136 137 void pmd_set(pmd_t *pmdp, pte_t *ptep) 138 { 139 unsigned long ptp; /* Physical address, shifted right by 4 */ 140 int i; 141 142 ptp = __nocache_pa(ptep) >> 4; 143 for (i = 0; i < PTRS_PER_PTE/SRMMU_REAL_PTRS_PER_PTE; i++) { 144 set_pte((pte_t *)&pmdp->pmdv[i], __pte(SRMMU_ET_PTD | ptp)); 145 ptp += (SRMMU_REAL_PTRS_PER_PTE * sizeof(pte_t) >> 4); 146 } 147 } 148 149 void pmd_populate(struct mm_struct *mm, pmd_t *pmdp, struct page *ptep) 150 { 151 unsigned long ptp; /* Physical address, shifted right by 4 */ 152 int i; 153 154 ptp = page_to_pfn(ptep) << (PAGE_SHIFT-4); /* watch for overflow */ 155 for (i = 0; i < PTRS_PER_PTE/SRMMU_REAL_PTRS_PER_PTE; i++) { 156 set_pte((pte_t *)&pmdp->pmdv[i], __pte(SRMMU_ET_PTD | ptp)); 157 ptp += (SRMMU_REAL_PTRS_PER_PTE * sizeof(pte_t) >> 4); 158 } 159 } 160 161 /* Find an entry in the third-level page table.. */ 162 pte_t *pte_offset_kernel(pmd_t *dir, unsigned long address) 163 { 164 void *pte; 165 166 pte = __nocache_va((dir->pmdv[0] & SRMMU_PTD_PMASK) << 4); 167 return (pte_t *) pte + 168 ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)); 169 } 170 171 /* 172 * size: bytes to allocate in the nocache area. 173 * align: bytes, number to align at. 174 * Returns the virtual address of the allocated area. 175 */ 176 static void *__srmmu_get_nocache(int size, int align) 177 { 178 int offset; 179 unsigned long addr; 180 181 if (size < SRMMU_NOCACHE_BITMAP_SHIFT) { 182 printk(KERN_ERR "Size 0x%x too small for nocache request\n", 183 size); 184 size = SRMMU_NOCACHE_BITMAP_SHIFT; 185 } 186 if (size & (SRMMU_NOCACHE_BITMAP_SHIFT - 1)) { 187 printk(KERN_ERR "Size 0x%x unaligned int nocache request\n", 188 size); 189 size += SRMMU_NOCACHE_BITMAP_SHIFT - 1; 190 } 191 BUG_ON(align > SRMMU_NOCACHE_ALIGN_MAX); 192 193 offset = bit_map_string_get(&srmmu_nocache_map, 194 size >> SRMMU_NOCACHE_BITMAP_SHIFT, 195 align >> SRMMU_NOCACHE_BITMAP_SHIFT); 196 if (offset == -1) { 197 printk(KERN_ERR "srmmu: out of nocache %d: %d/%d\n", 198 size, (int) srmmu_nocache_size, 199 srmmu_nocache_map.used << SRMMU_NOCACHE_BITMAP_SHIFT); 200 return NULL; 201 } 202 203 addr = SRMMU_NOCACHE_VADDR + (offset << SRMMU_NOCACHE_BITMAP_SHIFT); 204 return (void *)addr; 205 } 206 207 void *srmmu_get_nocache(int size, int align) 208 { 209 void *tmp; 210 211 tmp = __srmmu_get_nocache(size, align); 212 213 if (tmp) 214 memset(tmp, 0, size); 215 216 return tmp; 217 } 218 219 void srmmu_free_nocache(void *addr, int size) 220 { 221 unsigned long vaddr; 222 int offset; 223 224 vaddr = (unsigned long)addr; 225 if (vaddr < SRMMU_NOCACHE_VADDR) { 226 printk("Vaddr %lx is smaller than nocache base 0x%lx\n", 227 vaddr, (unsigned long)SRMMU_NOCACHE_VADDR); 228 BUG(); 229 } 230 if (vaddr + size > srmmu_nocache_end) { 231 printk("Vaddr %lx is bigger than nocache end 0x%lx\n", 232 vaddr, srmmu_nocache_end); 233 BUG(); 234 } 235 if (!is_power_of_2(size)) { 236 printk("Size 0x%x is not a power of 2\n", size); 237 BUG(); 238 } 239 if (size < SRMMU_NOCACHE_BITMAP_SHIFT) { 240 printk("Size 0x%x is too small\n", size); 241 BUG(); 242 } 243 if (vaddr & (size - 1)) { 244 printk("Vaddr %lx is not aligned to size 0x%x\n", vaddr, size); 245 BUG(); 246 } 247 248 offset = (vaddr - SRMMU_NOCACHE_VADDR) >> SRMMU_NOCACHE_BITMAP_SHIFT; 249 size = size >> SRMMU_NOCACHE_BITMAP_SHIFT; 250 251 bit_map_clear(&srmmu_nocache_map, offset, size); 252 } 253 254 static void srmmu_early_allocate_ptable_skeleton(unsigned long start, 255 unsigned long end); 256 257 /* Return how much physical memory we have. */ 258 static unsigned long __init probe_memory(void) 259 { 260 unsigned long total = 0; 261 int i; 262 263 for (i = 0; sp_banks[i].num_bytes; i++) 264 total += sp_banks[i].num_bytes; 265 266 return total; 267 } 268 269 /* 270 * Reserve nocache dynamically proportionally to the amount of 271 * system RAM. -- Tomas Szepe <szepe@pinerecords.com>, June 2002 272 */ 273 static void __init srmmu_nocache_calcsize(void) 274 { 275 unsigned long sysmemavail = probe_memory() / 1024; 276 int srmmu_nocache_npages; 277 278 srmmu_nocache_npages = 279 sysmemavail / SRMMU_NOCACHE_ALCRATIO / 1024 * 256; 280 281 /* P3 XXX The 4x overuse: corroborated by /proc/meminfo. */ 282 // if (srmmu_nocache_npages < 256) srmmu_nocache_npages = 256; 283 if (srmmu_nocache_npages < SRMMU_MIN_NOCACHE_PAGES) 284 srmmu_nocache_npages = SRMMU_MIN_NOCACHE_PAGES; 285 286 /* anything above 1280 blows up */ 287 if (srmmu_nocache_npages > SRMMU_MAX_NOCACHE_PAGES) 288 srmmu_nocache_npages = SRMMU_MAX_NOCACHE_PAGES; 289 290 srmmu_nocache_size = srmmu_nocache_npages * PAGE_SIZE; 291 srmmu_nocache_end = SRMMU_NOCACHE_VADDR + srmmu_nocache_size; 292 } 293 294 static void __init srmmu_nocache_init(void) 295 { 296 void *srmmu_nocache_bitmap; 297 unsigned int bitmap_bits; 298 pgd_t *pgd; 299 pmd_t *pmd; 300 pte_t *pte; 301 unsigned long paddr, vaddr; 302 unsigned long pteval; 303 304 bitmap_bits = srmmu_nocache_size >> SRMMU_NOCACHE_BITMAP_SHIFT; 305 306 srmmu_nocache_pool = memblock_alloc(srmmu_nocache_size, 307 SRMMU_NOCACHE_ALIGN_MAX); 308 if (!srmmu_nocache_pool) 309 panic("%s: Failed to allocate %lu bytes align=0x%x\n", 310 __func__, srmmu_nocache_size, SRMMU_NOCACHE_ALIGN_MAX); 311 memset(srmmu_nocache_pool, 0, srmmu_nocache_size); 312 313 srmmu_nocache_bitmap = 314 memblock_alloc(BITS_TO_LONGS(bitmap_bits) * sizeof(long), 315 SMP_CACHE_BYTES); 316 if (!srmmu_nocache_bitmap) 317 panic("%s: Failed to allocate %zu bytes\n", __func__, 318 BITS_TO_LONGS(bitmap_bits) * sizeof(long)); 319 bit_map_init(&srmmu_nocache_map, srmmu_nocache_bitmap, bitmap_bits); 320 321 srmmu_swapper_pg_dir = __srmmu_get_nocache(SRMMU_PGD_TABLE_SIZE, SRMMU_PGD_TABLE_SIZE); 322 memset(__nocache_fix(srmmu_swapper_pg_dir), 0, SRMMU_PGD_TABLE_SIZE); 323 init_mm.pgd = srmmu_swapper_pg_dir; 324 325 srmmu_early_allocate_ptable_skeleton(SRMMU_NOCACHE_VADDR, srmmu_nocache_end); 326 327 paddr = __pa((unsigned long)srmmu_nocache_pool); 328 vaddr = SRMMU_NOCACHE_VADDR; 329 330 while (vaddr < srmmu_nocache_end) { 331 pgd = pgd_offset_k(vaddr); 332 pmd = pmd_offset(__nocache_fix(pgd), vaddr); 333 pte = pte_offset_kernel(__nocache_fix(pmd), vaddr); 334 335 pteval = ((paddr >> 4) | SRMMU_ET_PTE | SRMMU_PRIV); 336 337 if (srmmu_cache_pagetables) 338 pteval |= SRMMU_CACHE; 339 340 set_pte(__nocache_fix(pte), __pte(pteval)); 341 342 vaddr += PAGE_SIZE; 343 paddr += PAGE_SIZE; 344 } 345 346 flush_cache_all(); 347 flush_tlb_all(); 348 } 349 350 pgd_t *get_pgd_fast(void) 351 { 352 pgd_t *pgd = NULL; 353 354 pgd = __srmmu_get_nocache(SRMMU_PGD_TABLE_SIZE, SRMMU_PGD_TABLE_SIZE); 355 if (pgd) { 356 pgd_t *init = pgd_offset_k(0); 357 memset(pgd, 0, USER_PTRS_PER_PGD * sizeof(pgd_t)); 358 memcpy(pgd + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD, 359 (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t)); 360 } 361 362 return pgd; 363 } 364 365 /* 366 * Hardware needs alignment to 256 only, but we align to whole page size 367 * to reduce fragmentation problems due to the buddy principle. 368 * XXX Provide actual fragmentation statistics in /proc. 369 * 370 * Alignments up to the page size are the same for physical and virtual 371 * addresses of the nocache area. 372 */ 373 pgtable_t pte_alloc_one(struct mm_struct *mm) 374 { 375 unsigned long pte; 376 struct page *page; 377 378 if ((pte = (unsigned long)pte_alloc_one_kernel(mm)) == 0) 379 return NULL; 380 page = pfn_to_page(__nocache_pa(pte) >> PAGE_SHIFT); 381 if (!pgtable_page_ctor(page)) { 382 __free_page(page); 383 return NULL; 384 } 385 return page; 386 } 387 388 void pte_free(struct mm_struct *mm, pgtable_t pte) 389 { 390 unsigned long p; 391 392 pgtable_page_dtor(pte); 393 p = (unsigned long)page_address(pte); /* Cached address (for test) */ 394 if (p == 0) 395 BUG(); 396 p = page_to_pfn(pte) << PAGE_SHIFT; /* Physical address */ 397 398 /* free non cached virtual address*/ 399 srmmu_free_nocache(__nocache_va(p), PTE_SIZE); 400 } 401 402 /* context handling - a dynamically sized pool is used */ 403 #define NO_CONTEXT -1 404 405 struct ctx_list { 406 struct ctx_list *next; 407 struct ctx_list *prev; 408 unsigned int ctx_number; 409 struct mm_struct *ctx_mm; 410 }; 411 412 static struct ctx_list *ctx_list_pool; 413 static struct ctx_list ctx_free; 414 static struct ctx_list ctx_used; 415 416 /* At boot time we determine the number of contexts */ 417 static int num_contexts; 418 419 static inline void remove_from_ctx_list(struct ctx_list *entry) 420 { 421 entry->next->prev = entry->prev; 422 entry->prev->next = entry->next; 423 } 424 425 static inline void add_to_ctx_list(struct ctx_list *head, struct ctx_list *entry) 426 { 427 entry->next = head; 428 (entry->prev = head->prev)->next = entry; 429 head->prev = entry; 430 } 431 #define add_to_free_ctxlist(entry) add_to_ctx_list(&ctx_free, entry) 432 #define add_to_used_ctxlist(entry) add_to_ctx_list(&ctx_used, entry) 433 434 435 static inline void alloc_context(struct mm_struct *old_mm, struct mm_struct *mm) 436 { 437 struct ctx_list *ctxp; 438 439 ctxp = ctx_free.next; 440 if (ctxp != &ctx_free) { 441 remove_from_ctx_list(ctxp); 442 add_to_used_ctxlist(ctxp); 443 mm->context = ctxp->ctx_number; 444 ctxp->ctx_mm = mm; 445 return; 446 } 447 ctxp = ctx_used.next; 448 if (ctxp->ctx_mm == old_mm) 449 ctxp = ctxp->next; 450 if (ctxp == &ctx_used) 451 panic("out of mmu contexts"); 452 flush_cache_mm(ctxp->ctx_mm); 453 flush_tlb_mm(ctxp->ctx_mm); 454 remove_from_ctx_list(ctxp); 455 add_to_used_ctxlist(ctxp); 456 ctxp->ctx_mm->context = NO_CONTEXT; 457 ctxp->ctx_mm = mm; 458 mm->context = ctxp->ctx_number; 459 } 460 461 static inline void free_context(int context) 462 { 463 struct ctx_list *ctx_old; 464 465 ctx_old = ctx_list_pool + context; 466 remove_from_ctx_list(ctx_old); 467 add_to_free_ctxlist(ctx_old); 468 } 469 470 static void __init sparc_context_init(int numctx) 471 { 472 int ctx; 473 unsigned long size; 474 475 size = numctx * sizeof(struct ctx_list); 476 ctx_list_pool = memblock_alloc(size, SMP_CACHE_BYTES); 477 if (!ctx_list_pool) 478 panic("%s: Failed to allocate %lu bytes\n", __func__, size); 479 480 for (ctx = 0; ctx < numctx; ctx++) { 481 struct ctx_list *clist; 482 483 clist = (ctx_list_pool + ctx); 484 clist->ctx_number = ctx; 485 clist->ctx_mm = NULL; 486 } 487 ctx_free.next = ctx_free.prev = &ctx_free; 488 ctx_used.next = ctx_used.prev = &ctx_used; 489 for (ctx = 0; ctx < numctx; ctx++) 490 add_to_free_ctxlist(ctx_list_pool + ctx); 491 } 492 493 void switch_mm(struct mm_struct *old_mm, struct mm_struct *mm, 494 struct task_struct *tsk) 495 { 496 unsigned long flags; 497 498 if (mm->context == NO_CONTEXT) { 499 spin_lock_irqsave(&srmmu_context_spinlock, flags); 500 alloc_context(old_mm, mm); 501 spin_unlock_irqrestore(&srmmu_context_spinlock, flags); 502 srmmu_ctxd_set(&srmmu_context_table[mm->context], mm->pgd); 503 } 504 505 if (sparc_cpu_model == sparc_leon) 506 leon_switch_mm(); 507 508 if (is_hypersparc) 509 hyper_flush_whole_icache(); 510 511 srmmu_set_context(mm->context); 512 } 513 514 /* Low level IO area allocation on the SRMMU. */ 515 static inline void srmmu_mapioaddr(unsigned long physaddr, 516 unsigned long virt_addr, int bus_type) 517 { 518 pgd_t *pgdp; 519 pmd_t *pmdp; 520 pte_t *ptep; 521 unsigned long tmp; 522 523 physaddr &= PAGE_MASK; 524 pgdp = pgd_offset_k(virt_addr); 525 pmdp = pmd_offset(pgdp, virt_addr); 526 ptep = pte_offset_kernel(pmdp, virt_addr); 527 tmp = (physaddr >> 4) | SRMMU_ET_PTE; 528 529 /* I need to test whether this is consistent over all 530 * sun4m's. The bus_type represents the upper 4 bits of 531 * 36-bit physical address on the I/O space lines... 532 */ 533 tmp |= (bus_type << 28); 534 tmp |= SRMMU_PRIV; 535 __flush_page_to_ram(virt_addr); 536 set_pte(ptep, __pte(tmp)); 537 } 538 539 void srmmu_mapiorange(unsigned int bus, unsigned long xpa, 540 unsigned long xva, unsigned int len) 541 { 542 while (len != 0) { 543 len -= PAGE_SIZE; 544 srmmu_mapioaddr(xpa, xva, bus); 545 xva += PAGE_SIZE; 546 xpa += PAGE_SIZE; 547 } 548 flush_tlb_all(); 549 } 550 551 static inline void srmmu_unmapioaddr(unsigned long virt_addr) 552 { 553 pgd_t *pgdp; 554 pmd_t *pmdp; 555 pte_t *ptep; 556 557 pgdp = pgd_offset_k(virt_addr); 558 pmdp = pmd_offset(pgdp, virt_addr); 559 ptep = pte_offset_kernel(pmdp, virt_addr); 560 561 /* No need to flush uncacheable page. */ 562 __pte_clear(ptep); 563 } 564 565 void srmmu_unmapiorange(unsigned long virt_addr, unsigned int len) 566 { 567 while (len != 0) { 568 len -= PAGE_SIZE; 569 srmmu_unmapioaddr(virt_addr); 570 virt_addr += PAGE_SIZE; 571 } 572 flush_tlb_all(); 573 } 574 575 /* tsunami.S */ 576 extern void tsunami_flush_cache_all(void); 577 extern void tsunami_flush_cache_mm(struct mm_struct *mm); 578 extern void tsunami_flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned long end); 579 extern void tsunami_flush_cache_page(struct vm_area_struct *vma, unsigned long page); 580 extern void tsunami_flush_page_to_ram(unsigned long page); 581 extern void tsunami_flush_page_for_dma(unsigned long page); 582 extern void tsunami_flush_sig_insns(struct mm_struct *mm, unsigned long insn_addr); 583 extern void tsunami_flush_tlb_all(void); 584 extern void tsunami_flush_tlb_mm(struct mm_struct *mm); 585 extern void tsunami_flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end); 586 extern void tsunami_flush_tlb_page(struct vm_area_struct *vma, unsigned long page); 587 extern void tsunami_setup_blockops(void); 588 589 /* swift.S */ 590 extern void swift_flush_cache_all(void); 591 extern void swift_flush_cache_mm(struct mm_struct *mm); 592 extern void swift_flush_cache_range(struct vm_area_struct *vma, 593 unsigned long start, unsigned long end); 594 extern void swift_flush_cache_page(struct vm_area_struct *vma, unsigned long page); 595 extern void swift_flush_page_to_ram(unsigned long page); 596 extern void swift_flush_page_for_dma(unsigned long page); 597 extern void swift_flush_sig_insns(struct mm_struct *mm, unsigned long insn_addr); 598 extern void swift_flush_tlb_all(void); 599 extern void swift_flush_tlb_mm(struct mm_struct *mm); 600 extern void swift_flush_tlb_range(struct vm_area_struct *vma, 601 unsigned long start, unsigned long end); 602 extern void swift_flush_tlb_page(struct vm_area_struct *vma, unsigned long page); 603 604 #if 0 /* P3: deadwood to debug precise flushes on Swift. */ 605 void swift_flush_tlb_page(struct vm_area_struct *vma, unsigned long page) 606 { 607 int cctx, ctx1; 608 609 page &= PAGE_MASK; 610 if ((ctx1 = vma->vm_mm->context) != -1) { 611 cctx = srmmu_get_context(); 612 /* Is context # ever different from current context? P3 */ 613 if (cctx != ctx1) { 614 printk("flush ctx %02x curr %02x\n", ctx1, cctx); 615 srmmu_set_context(ctx1); 616 swift_flush_page(page); 617 __asm__ __volatile__("sta %%g0, [%0] %1\n\t" : : 618 "r" (page), "i" (ASI_M_FLUSH_PROBE)); 619 srmmu_set_context(cctx); 620 } else { 621 /* Rm. prot. bits from virt. c. */ 622 /* swift_flush_cache_all(); */ 623 /* swift_flush_cache_page(vma, page); */ 624 swift_flush_page(page); 625 626 __asm__ __volatile__("sta %%g0, [%0] %1\n\t" : : 627 "r" (page), "i" (ASI_M_FLUSH_PROBE)); 628 /* same as above: srmmu_flush_tlb_page() */ 629 } 630 } 631 } 632 #endif 633 634 /* 635 * The following are all MBUS based SRMMU modules, and therefore could 636 * be found in a multiprocessor configuration. On the whole, these 637 * chips seems to be much more touchy about DVMA and page tables 638 * with respect to cache coherency. 639 */ 640 641 /* viking.S */ 642 extern void viking_flush_cache_all(void); 643 extern void viking_flush_cache_mm(struct mm_struct *mm); 644 extern void viking_flush_cache_range(struct vm_area_struct *vma, unsigned long start, 645 unsigned long end); 646 extern void viking_flush_cache_page(struct vm_area_struct *vma, unsigned long page); 647 extern void viking_flush_page_to_ram(unsigned long page); 648 extern void viking_flush_page_for_dma(unsigned long page); 649 extern void viking_flush_sig_insns(struct mm_struct *mm, unsigned long addr); 650 extern void viking_flush_page(unsigned long page); 651 extern void viking_mxcc_flush_page(unsigned long page); 652 extern void viking_flush_tlb_all(void); 653 extern void viking_flush_tlb_mm(struct mm_struct *mm); 654 extern void viking_flush_tlb_range(struct vm_area_struct *vma, unsigned long start, 655 unsigned long end); 656 extern void viking_flush_tlb_page(struct vm_area_struct *vma, 657 unsigned long page); 658 extern void sun4dsmp_flush_tlb_all(void); 659 extern void sun4dsmp_flush_tlb_mm(struct mm_struct *mm); 660 extern void sun4dsmp_flush_tlb_range(struct vm_area_struct *vma, unsigned long start, 661 unsigned long end); 662 extern void sun4dsmp_flush_tlb_page(struct vm_area_struct *vma, 663 unsigned long page); 664 665 /* hypersparc.S */ 666 extern void hypersparc_flush_cache_all(void); 667 extern void hypersparc_flush_cache_mm(struct mm_struct *mm); 668 extern void hypersparc_flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned long end); 669 extern void hypersparc_flush_cache_page(struct vm_area_struct *vma, unsigned long page); 670 extern void hypersparc_flush_page_to_ram(unsigned long page); 671 extern void hypersparc_flush_page_for_dma(unsigned long page); 672 extern void hypersparc_flush_sig_insns(struct mm_struct *mm, unsigned long insn_addr); 673 extern void hypersparc_flush_tlb_all(void); 674 extern void hypersparc_flush_tlb_mm(struct mm_struct *mm); 675 extern void hypersparc_flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end); 676 extern void hypersparc_flush_tlb_page(struct vm_area_struct *vma, unsigned long page); 677 extern void hypersparc_setup_blockops(void); 678 679 /* 680 * NOTE: All of this startup code assumes the low 16mb (approx.) of 681 * kernel mappings are done with one single contiguous chunk of 682 * ram. On small ram machines (classics mainly) we only get 683 * around 8mb mapped for us. 684 */ 685 686 static void __init early_pgtable_allocfail(char *type) 687 { 688 prom_printf("inherit_prom_mappings: Cannot alloc kernel %s.\n", type); 689 prom_halt(); 690 } 691 692 static void __init srmmu_early_allocate_ptable_skeleton(unsigned long start, 693 unsigned long end) 694 { 695 pgd_t *pgdp; 696 pmd_t *pmdp; 697 pte_t *ptep; 698 699 while (start < end) { 700 pgdp = pgd_offset_k(start); 701 if (pgd_none(*(pgd_t *)__nocache_fix(pgdp))) { 702 pmdp = __srmmu_get_nocache( 703 SRMMU_PMD_TABLE_SIZE, SRMMU_PMD_TABLE_SIZE); 704 if (pmdp == NULL) 705 early_pgtable_allocfail("pmd"); 706 memset(__nocache_fix(pmdp), 0, SRMMU_PMD_TABLE_SIZE); 707 pgd_set(__nocache_fix(pgdp), pmdp); 708 } 709 pmdp = pmd_offset(__nocache_fix(pgdp), start); 710 if (srmmu_pmd_none(*(pmd_t *)__nocache_fix(pmdp))) { 711 ptep = __srmmu_get_nocache(PTE_SIZE, PTE_SIZE); 712 if (ptep == NULL) 713 early_pgtable_allocfail("pte"); 714 memset(__nocache_fix(ptep), 0, PTE_SIZE); 715 pmd_set(__nocache_fix(pmdp), ptep); 716 } 717 if (start > (0xffffffffUL - PMD_SIZE)) 718 break; 719 start = (start + PMD_SIZE) & PMD_MASK; 720 } 721 } 722 723 static void __init srmmu_allocate_ptable_skeleton(unsigned long start, 724 unsigned long end) 725 { 726 pgd_t *pgdp; 727 pmd_t *pmdp; 728 pte_t *ptep; 729 730 while (start < end) { 731 pgdp = pgd_offset_k(start); 732 if (pgd_none(*pgdp)) { 733 pmdp = __srmmu_get_nocache(SRMMU_PMD_TABLE_SIZE, SRMMU_PMD_TABLE_SIZE); 734 if (pmdp == NULL) 735 early_pgtable_allocfail("pmd"); 736 memset(pmdp, 0, SRMMU_PMD_TABLE_SIZE); 737 pgd_set(pgdp, pmdp); 738 } 739 pmdp = pmd_offset(pgdp, start); 740 if (srmmu_pmd_none(*pmdp)) { 741 ptep = __srmmu_get_nocache(PTE_SIZE, 742 PTE_SIZE); 743 if (ptep == NULL) 744 early_pgtable_allocfail("pte"); 745 memset(ptep, 0, PTE_SIZE); 746 pmd_set(pmdp, ptep); 747 } 748 if (start > (0xffffffffUL - PMD_SIZE)) 749 break; 750 start = (start + PMD_SIZE) & PMD_MASK; 751 } 752 } 753 754 /* These flush types are not available on all chips... */ 755 static inline unsigned long srmmu_probe(unsigned long vaddr) 756 { 757 unsigned long retval; 758 759 if (sparc_cpu_model != sparc_leon) { 760 761 vaddr &= PAGE_MASK; 762 __asm__ __volatile__("lda [%1] %2, %0\n\t" : 763 "=r" (retval) : 764 "r" (vaddr | 0x400), "i" (ASI_M_FLUSH_PROBE)); 765 } else { 766 retval = leon_swprobe(vaddr, NULL); 767 } 768 return retval; 769 } 770 771 /* 772 * This is much cleaner than poking around physical address space 773 * looking at the prom's page table directly which is what most 774 * other OS's do. Yuck... this is much better. 775 */ 776 static void __init srmmu_inherit_prom_mappings(unsigned long start, 777 unsigned long end) 778 { 779 unsigned long probed; 780 unsigned long addr; 781 pgd_t *pgdp; 782 pmd_t *pmdp; 783 pte_t *ptep; 784 int what; /* 0 = normal-pte, 1 = pmd-level pte, 2 = pgd-level pte */ 785 786 while (start <= end) { 787 if (start == 0) 788 break; /* probably wrap around */ 789 if (start == 0xfef00000) 790 start = KADB_DEBUGGER_BEGVM; 791 probed = srmmu_probe(start); 792 if (!probed) { 793 /* continue probing until we find an entry */ 794 start += PAGE_SIZE; 795 continue; 796 } 797 798 /* A red snapper, see what it really is. */ 799 what = 0; 800 addr = start - PAGE_SIZE; 801 802 if (!(start & ~(SRMMU_REAL_PMD_MASK))) { 803 if (srmmu_probe(addr + SRMMU_REAL_PMD_SIZE) == probed) 804 what = 1; 805 } 806 807 if (!(start & ~(SRMMU_PGDIR_MASK))) { 808 if (srmmu_probe(addr + SRMMU_PGDIR_SIZE) == probed) 809 what = 2; 810 } 811 812 pgdp = pgd_offset_k(start); 813 if (what == 2) { 814 *(pgd_t *)__nocache_fix(pgdp) = __pgd(probed); 815 start += SRMMU_PGDIR_SIZE; 816 continue; 817 } 818 if (pgd_none(*(pgd_t *)__nocache_fix(pgdp))) { 819 pmdp = __srmmu_get_nocache(SRMMU_PMD_TABLE_SIZE, 820 SRMMU_PMD_TABLE_SIZE); 821 if (pmdp == NULL) 822 early_pgtable_allocfail("pmd"); 823 memset(__nocache_fix(pmdp), 0, SRMMU_PMD_TABLE_SIZE); 824 pgd_set(__nocache_fix(pgdp), pmdp); 825 } 826 pmdp = pmd_offset(__nocache_fix(pgdp), start); 827 if (srmmu_pmd_none(*(pmd_t *)__nocache_fix(pmdp))) { 828 ptep = __srmmu_get_nocache(PTE_SIZE, PTE_SIZE); 829 if (ptep == NULL) 830 early_pgtable_allocfail("pte"); 831 memset(__nocache_fix(ptep), 0, PTE_SIZE); 832 pmd_set(__nocache_fix(pmdp), ptep); 833 } 834 if (what == 1) { 835 /* We bend the rule where all 16 PTPs in a pmd_t point 836 * inside the same PTE page, and we leak a perfectly 837 * good hardware PTE piece. Alternatives seem worse. 838 */ 839 unsigned int x; /* Index of HW PMD in soft cluster */ 840 unsigned long *val; 841 x = (start >> PMD_SHIFT) & 15; 842 val = &pmdp->pmdv[x]; 843 *(unsigned long *)__nocache_fix(val) = probed; 844 start += SRMMU_REAL_PMD_SIZE; 845 continue; 846 } 847 ptep = pte_offset_kernel(__nocache_fix(pmdp), start); 848 *(pte_t *)__nocache_fix(ptep) = __pte(probed); 849 start += PAGE_SIZE; 850 } 851 } 852 853 #define KERNEL_PTE(page_shifted) ((page_shifted)|SRMMU_CACHE|SRMMU_PRIV|SRMMU_VALID) 854 855 /* Create a third-level SRMMU 16MB page mapping. */ 856 static void __init do_large_mapping(unsigned long vaddr, unsigned long phys_base) 857 { 858 pgd_t *pgdp = pgd_offset_k(vaddr); 859 unsigned long big_pte; 860 861 big_pte = KERNEL_PTE(phys_base >> 4); 862 *(pgd_t *)__nocache_fix(pgdp) = __pgd(big_pte); 863 } 864 865 /* Map sp_bank entry SP_ENTRY, starting at virtual address VBASE. */ 866 static unsigned long __init map_spbank(unsigned long vbase, int sp_entry) 867 { 868 unsigned long pstart = (sp_banks[sp_entry].base_addr & SRMMU_PGDIR_MASK); 869 unsigned long vstart = (vbase & SRMMU_PGDIR_MASK); 870 unsigned long vend = SRMMU_PGDIR_ALIGN(vbase + sp_banks[sp_entry].num_bytes); 871 /* Map "low" memory only */ 872 const unsigned long min_vaddr = PAGE_OFFSET; 873 const unsigned long max_vaddr = PAGE_OFFSET + SRMMU_MAXMEM; 874 875 if (vstart < min_vaddr || vstart >= max_vaddr) 876 return vstart; 877 878 if (vend > max_vaddr || vend < min_vaddr) 879 vend = max_vaddr; 880 881 while (vstart < vend) { 882 do_large_mapping(vstart, pstart); 883 vstart += SRMMU_PGDIR_SIZE; pstart += SRMMU_PGDIR_SIZE; 884 } 885 return vstart; 886 } 887 888 static void __init map_kernel(void) 889 { 890 int i; 891 892 if (phys_base > 0) { 893 do_large_mapping(PAGE_OFFSET, phys_base); 894 } 895 896 for (i = 0; sp_banks[i].num_bytes != 0; i++) { 897 map_spbank((unsigned long)__va(sp_banks[i].base_addr), i); 898 } 899 } 900 901 void (*poke_srmmu)(void) = NULL; 902 903 void __init srmmu_paging_init(void) 904 { 905 int i; 906 phandle cpunode; 907 char node_str[128]; 908 pgd_t *pgd; 909 pmd_t *pmd; 910 pte_t *pte; 911 unsigned long pages_avail; 912 913 init_mm.context = (unsigned long) NO_CONTEXT; 914 sparc_iomap.start = SUN4M_IOBASE_VADDR; /* 16MB of IOSPACE on all sun4m's. */ 915 916 if (sparc_cpu_model == sun4d) 917 num_contexts = 65536; /* We know it is Viking */ 918 else { 919 /* Find the number of contexts on the srmmu. */ 920 cpunode = prom_getchild(prom_root_node); 921 num_contexts = 0; 922 while (cpunode != 0) { 923 prom_getstring(cpunode, "device_type", node_str, sizeof(node_str)); 924 if (!strcmp(node_str, "cpu")) { 925 num_contexts = prom_getintdefault(cpunode, "mmu-nctx", 0x8); 926 break; 927 } 928 cpunode = prom_getsibling(cpunode); 929 } 930 } 931 932 if (!num_contexts) { 933 prom_printf("Something wrong, can't find cpu node in paging_init.\n"); 934 prom_halt(); 935 } 936 937 pages_avail = 0; 938 last_valid_pfn = bootmem_init(&pages_avail); 939 940 srmmu_nocache_calcsize(); 941 srmmu_nocache_init(); 942 srmmu_inherit_prom_mappings(0xfe400000, (LINUX_OPPROM_ENDVM - PAGE_SIZE)); 943 map_kernel(); 944 945 /* ctx table has to be physically aligned to its size */ 946 srmmu_context_table = __srmmu_get_nocache(num_contexts * sizeof(ctxd_t), num_contexts * sizeof(ctxd_t)); 947 srmmu_ctx_table_phys = (ctxd_t *)__nocache_pa(srmmu_context_table); 948 949 for (i = 0; i < num_contexts; i++) 950 srmmu_ctxd_set((ctxd_t *)__nocache_fix(&srmmu_context_table[i]), srmmu_swapper_pg_dir); 951 952 flush_cache_all(); 953 srmmu_set_ctable_ptr((unsigned long)srmmu_ctx_table_phys); 954 #ifdef CONFIG_SMP 955 /* Stop from hanging here... */ 956 local_ops->tlb_all(); 957 #else 958 flush_tlb_all(); 959 #endif 960 poke_srmmu(); 961 962 srmmu_allocate_ptable_skeleton(sparc_iomap.start, IOBASE_END); 963 srmmu_allocate_ptable_skeleton(DVMA_VADDR, DVMA_END); 964 965 srmmu_allocate_ptable_skeleton( 966 __fix_to_virt(__end_of_fixed_addresses - 1), FIXADDR_TOP); 967 srmmu_allocate_ptable_skeleton(PKMAP_BASE, PKMAP_END); 968 969 pgd = pgd_offset_k(PKMAP_BASE); 970 pmd = pmd_offset(pgd, PKMAP_BASE); 971 pte = pte_offset_kernel(pmd, PKMAP_BASE); 972 pkmap_page_table = pte; 973 974 flush_cache_all(); 975 flush_tlb_all(); 976 977 sparc_context_init(num_contexts); 978 979 kmap_init(); 980 981 { 982 unsigned long zones_size[MAX_NR_ZONES]; 983 unsigned long zholes_size[MAX_NR_ZONES]; 984 unsigned long npages; 985 int znum; 986 987 for (znum = 0; znum < MAX_NR_ZONES; znum++) 988 zones_size[znum] = zholes_size[znum] = 0; 989 990 npages = max_low_pfn - pfn_base; 991 992 zones_size[ZONE_DMA] = npages; 993 zholes_size[ZONE_DMA] = npages - pages_avail; 994 995 npages = highend_pfn - max_low_pfn; 996 zones_size[ZONE_HIGHMEM] = npages; 997 zholes_size[ZONE_HIGHMEM] = npages - calc_highpages(); 998 999 free_area_init_node(0, zones_size, pfn_base, zholes_size); 1000 } 1001 } 1002 1003 void mmu_info(struct seq_file *m) 1004 { 1005 seq_printf(m, 1006 "MMU type\t: %s\n" 1007 "contexts\t: %d\n" 1008 "nocache total\t: %ld\n" 1009 "nocache used\t: %d\n", 1010 srmmu_name, 1011 num_contexts, 1012 srmmu_nocache_size, 1013 srmmu_nocache_map.used << SRMMU_NOCACHE_BITMAP_SHIFT); 1014 } 1015 1016 int init_new_context(struct task_struct *tsk, struct mm_struct *mm) 1017 { 1018 mm->context = NO_CONTEXT; 1019 return 0; 1020 } 1021 1022 void destroy_context(struct mm_struct *mm) 1023 { 1024 unsigned long flags; 1025 1026 if (mm->context != NO_CONTEXT) { 1027 flush_cache_mm(mm); 1028 srmmu_ctxd_set(&srmmu_context_table[mm->context], srmmu_swapper_pg_dir); 1029 flush_tlb_mm(mm); 1030 spin_lock_irqsave(&srmmu_context_spinlock, flags); 1031 free_context(mm->context); 1032 spin_unlock_irqrestore(&srmmu_context_spinlock, flags); 1033 mm->context = NO_CONTEXT; 1034 } 1035 } 1036 1037 /* Init various srmmu chip types. */ 1038 static void __init srmmu_is_bad(void) 1039 { 1040 prom_printf("Could not determine SRMMU chip type.\n"); 1041 prom_halt(); 1042 } 1043 1044 static void __init init_vac_layout(void) 1045 { 1046 phandle nd; 1047 int cache_lines; 1048 char node_str[128]; 1049 #ifdef CONFIG_SMP 1050 int cpu = 0; 1051 unsigned long max_size = 0; 1052 unsigned long min_line_size = 0x10000000; 1053 #endif 1054 1055 nd = prom_getchild(prom_root_node); 1056 while ((nd = prom_getsibling(nd)) != 0) { 1057 prom_getstring(nd, "device_type", node_str, sizeof(node_str)); 1058 if (!strcmp(node_str, "cpu")) { 1059 vac_line_size = prom_getint(nd, "cache-line-size"); 1060 if (vac_line_size == -1) { 1061 prom_printf("can't determine cache-line-size, halting.\n"); 1062 prom_halt(); 1063 } 1064 cache_lines = prom_getint(nd, "cache-nlines"); 1065 if (cache_lines == -1) { 1066 prom_printf("can't determine cache-nlines, halting.\n"); 1067 prom_halt(); 1068 } 1069 1070 vac_cache_size = cache_lines * vac_line_size; 1071 #ifdef CONFIG_SMP 1072 if (vac_cache_size > max_size) 1073 max_size = vac_cache_size; 1074 if (vac_line_size < min_line_size) 1075 min_line_size = vac_line_size; 1076 //FIXME: cpus not contiguous!! 1077 cpu++; 1078 if (cpu >= nr_cpu_ids || !cpu_online(cpu)) 1079 break; 1080 #else 1081 break; 1082 #endif 1083 } 1084 } 1085 if (nd == 0) { 1086 prom_printf("No CPU nodes found, halting.\n"); 1087 prom_halt(); 1088 } 1089 #ifdef CONFIG_SMP 1090 vac_cache_size = max_size; 1091 vac_line_size = min_line_size; 1092 #endif 1093 printk("SRMMU: Using VAC size of %d bytes, line size %d bytes.\n", 1094 (int)vac_cache_size, (int)vac_line_size); 1095 } 1096 1097 static void poke_hypersparc(void) 1098 { 1099 volatile unsigned long clear; 1100 unsigned long mreg = srmmu_get_mmureg(); 1101 1102 hyper_flush_unconditional_combined(); 1103 1104 mreg &= ~(HYPERSPARC_CWENABLE); 1105 mreg |= (HYPERSPARC_CENABLE | HYPERSPARC_WBENABLE); 1106 mreg |= (HYPERSPARC_CMODE); 1107 1108 srmmu_set_mmureg(mreg); 1109 1110 #if 0 /* XXX I think this is bad news... -DaveM */ 1111 hyper_clear_all_tags(); 1112 #endif 1113 1114 put_ross_icr(HYPERSPARC_ICCR_FTD | HYPERSPARC_ICCR_ICE); 1115 hyper_flush_whole_icache(); 1116 clear = srmmu_get_faddr(); 1117 clear = srmmu_get_fstatus(); 1118 } 1119 1120 static const struct sparc32_cachetlb_ops hypersparc_ops = { 1121 .cache_all = hypersparc_flush_cache_all, 1122 .cache_mm = hypersparc_flush_cache_mm, 1123 .cache_page = hypersparc_flush_cache_page, 1124 .cache_range = hypersparc_flush_cache_range, 1125 .tlb_all = hypersparc_flush_tlb_all, 1126 .tlb_mm = hypersparc_flush_tlb_mm, 1127 .tlb_page = hypersparc_flush_tlb_page, 1128 .tlb_range = hypersparc_flush_tlb_range, 1129 .page_to_ram = hypersparc_flush_page_to_ram, 1130 .sig_insns = hypersparc_flush_sig_insns, 1131 .page_for_dma = hypersparc_flush_page_for_dma, 1132 }; 1133 1134 static void __init init_hypersparc(void) 1135 { 1136 srmmu_name = "ROSS HyperSparc"; 1137 srmmu_modtype = HyperSparc; 1138 1139 init_vac_layout(); 1140 1141 is_hypersparc = 1; 1142 sparc32_cachetlb_ops = &hypersparc_ops; 1143 1144 poke_srmmu = poke_hypersparc; 1145 1146 hypersparc_setup_blockops(); 1147 } 1148 1149 static void poke_swift(void) 1150 { 1151 unsigned long mreg; 1152 1153 /* Clear any crap from the cache or else... */ 1154 swift_flush_cache_all(); 1155 1156 /* Enable I & D caches */ 1157 mreg = srmmu_get_mmureg(); 1158 mreg |= (SWIFT_IE | SWIFT_DE); 1159 /* 1160 * The Swift branch folding logic is completely broken. At 1161 * trap time, if things are just right, if can mistakenly 1162 * think that a trap is coming from kernel mode when in fact 1163 * it is coming from user mode (it mis-executes the branch in 1164 * the trap code). So you see things like crashme completely 1165 * hosing your machine which is completely unacceptable. Turn 1166 * this shit off... nice job Fujitsu. 1167 */ 1168 mreg &= ~(SWIFT_BF); 1169 srmmu_set_mmureg(mreg); 1170 } 1171 1172 static const struct sparc32_cachetlb_ops swift_ops = { 1173 .cache_all = swift_flush_cache_all, 1174 .cache_mm = swift_flush_cache_mm, 1175 .cache_page = swift_flush_cache_page, 1176 .cache_range = swift_flush_cache_range, 1177 .tlb_all = swift_flush_tlb_all, 1178 .tlb_mm = swift_flush_tlb_mm, 1179 .tlb_page = swift_flush_tlb_page, 1180 .tlb_range = swift_flush_tlb_range, 1181 .page_to_ram = swift_flush_page_to_ram, 1182 .sig_insns = swift_flush_sig_insns, 1183 .page_for_dma = swift_flush_page_for_dma, 1184 }; 1185 1186 #define SWIFT_MASKID_ADDR 0x10003018 1187 static void __init init_swift(void) 1188 { 1189 unsigned long swift_rev; 1190 1191 __asm__ __volatile__("lda [%1] %2, %0\n\t" 1192 "srl %0, 0x18, %0\n\t" : 1193 "=r" (swift_rev) : 1194 "r" (SWIFT_MASKID_ADDR), "i" (ASI_M_BYPASS)); 1195 srmmu_name = "Fujitsu Swift"; 1196 switch (swift_rev) { 1197 case 0x11: 1198 case 0x20: 1199 case 0x23: 1200 case 0x30: 1201 srmmu_modtype = Swift_lots_o_bugs; 1202 hwbug_bitmask |= (HWBUG_KERN_ACCBROKEN | HWBUG_KERN_CBITBROKEN); 1203 /* 1204 * Gee george, I wonder why Sun is so hush hush about 1205 * this hardware bug... really braindamage stuff going 1206 * on here. However I think we can find a way to avoid 1207 * all of the workaround overhead under Linux. Basically, 1208 * any page fault can cause kernel pages to become user 1209 * accessible (the mmu gets confused and clears some of 1210 * the ACC bits in kernel ptes). Aha, sounds pretty 1211 * horrible eh? But wait, after extensive testing it appears 1212 * that if you use pgd_t level large kernel pte's (like the 1213 * 4MB pages on the Pentium) the bug does not get tripped 1214 * at all. This avoids almost all of the major overhead. 1215 * Welcome to a world where your vendor tells you to, 1216 * "apply this kernel patch" instead of "sorry for the 1217 * broken hardware, send it back and we'll give you 1218 * properly functioning parts" 1219 */ 1220 break; 1221 case 0x25: 1222 case 0x31: 1223 srmmu_modtype = Swift_bad_c; 1224 hwbug_bitmask |= HWBUG_KERN_CBITBROKEN; 1225 /* 1226 * You see Sun allude to this hardware bug but never 1227 * admit things directly, they'll say things like, 1228 * "the Swift chip cache problems" or similar. 1229 */ 1230 break; 1231 default: 1232 srmmu_modtype = Swift_ok; 1233 break; 1234 } 1235 1236 sparc32_cachetlb_ops = &swift_ops; 1237 flush_page_for_dma_global = 0; 1238 1239 /* 1240 * Are you now convinced that the Swift is one of the 1241 * biggest VLSI abortions of all time? Bravo Fujitsu! 1242 * Fujitsu, the !#?!%$'d up processor people. I bet if 1243 * you examined the microcode of the Swift you'd find 1244 * XXX's all over the place. 1245 */ 1246 poke_srmmu = poke_swift; 1247 } 1248 1249 static void turbosparc_flush_cache_all(void) 1250 { 1251 flush_user_windows(); 1252 turbosparc_idflash_clear(); 1253 } 1254 1255 static void turbosparc_flush_cache_mm(struct mm_struct *mm) 1256 { 1257 FLUSH_BEGIN(mm) 1258 flush_user_windows(); 1259 turbosparc_idflash_clear(); 1260 FLUSH_END 1261 } 1262 1263 static void turbosparc_flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned long end) 1264 { 1265 FLUSH_BEGIN(vma->vm_mm) 1266 flush_user_windows(); 1267 turbosparc_idflash_clear(); 1268 FLUSH_END 1269 } 1270 1271 static void turbosparc_flush_cache_page(struct vm_area_struct *vma, unsigned long page) 1272 { 1273 FLUSH_BEGIN(vma->vm_mm) 1274 flush_user_windows(); 1275 if (vma->vm_flags & VM_EXEC) 1276 turbosparc_flush_icache(); 1277 turbosparc_flush_dcache(); 1278 FLUSH_END 1279 } 1280 1281 /* TurboSparc is copy-back, if we turn it on, but this does not work. */ 1282 static void turbosparc_flush_page_to_ram(unsigned long page) 1283 { 1284 #ifdef TURBOSPARC_WRITEBACK 1285 volatile unsigned long clear; 1286 1287 if (srmmu_probe(page)) 1288 turbosparc_flush_page_cache(page); 1289 clear = srmmu_get_fstatus(); 1290 #endif 1291 } 1292 1293 static void turbosparc_flush_sig_insns(struct mm_struct *mm, unsigned long insn_addr) 1294 { 1295 } 1296 1297 static void turbosparc_flush_page_for_dma(unsigned long page) 1298 { 1299 turbosparc_flush_dcache(); 1300 } 1301 1302 static void turbosparc_flush_tlb_all(void) 1303 { 1304 srmmu_flush_whole_tlb(); 1305 } 1306 1307 static void turbosparc_flush_tlb_mm(struct mm_struct *mm) 1308 { 1309 FLUSH_BEGIN(mm) 1310 srmmu_flush_whole_tlb(); 1311 FLUSH_END 1312 } 1313 1314 static void turbosparc_flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end) 1315 { 1316 FLUSH_BEGIN(vma->vm_mm) 1317 srmmu_flush_whole_tlb(); 1318 FLUSH_END 1319 } 1320 1321 static void turbosparc_flush_tlb_page(struct vm_area_struct *vma, unsigned long page) 1322 { 1323 FLUSH_BEGIN(vma->vm_mm) 1324 srmmu_flush_whole_tlb(); 1325 FLUSH_END 1326 } 1327 1328 1329 static void poke_turbosparc(void) 1330 { 1331 unsigned long mreg = srmmu_get_mmureg(); 1332 unsigned long ccreg; 1333 1334 /* Clear any crap from the cache or else... */ 1335 turbosparc_flush_cache_all(); 1336 /* Temporarily disable I & D caches */ 1337 mreg &= ~(TURBOSPARC_ICENABLE | TURBOSPARC_DCENABLE); 1338 mreg &= ~(TURBOSPARC_PCENABLE); /* Don't check parity */ 1339 srmmu_set_mmureg(mreg); 1340 1341 ccreg = turbosparc_get_ccreg(); 1342 1343 #ifdef TURBOSPARC_WRITEBACK 1344 ccreg |= (TURBOSPARC_SNENABLE); /* Do DVMA snooping in Dcache */ 1345 ccreg &= ~(TURBOSPARC_uS2 | TURBOSPARC_WTENABLE); 1346 /* Write-back D-cache, emulate VLSI 1347 * abortion number three, not number one */ 1348 #else 1349 /* For now let's play safe, optimize later */ 1350 ccreg |= (TURBOSPARC_SNENABLE | TURBOSPARC_WTENABLE); 1351 /* Do DVMA snooping in Dcache, Write-thru D-cache */ 1352 ccreg &= ~(TURBOSPARC_uS2); 1353 /* Emulate VLSI abortion number three, not number one */ 1354 #endif 1355 1356 switch (ccreg & 7) { 1357 case 0: /* No SE cache */ 1358 case 7: /* Test mode */ 1359 break; 1360 default: 1361 ccreg |= (TURBOSPARC_SCENABLE); 1362 } 1363 turbosparc_set_ccreg(ccreg); 1364 1365 mreg |= (TURBOSPARC_ICENABLE | TURBOSPARC_DCENABLE); /* I & D caches on */ 1366 mreg |= (TURBOSPARC_ICSNOOP); /* Icache snooping on */ 1367 srmmu_set_mmureg(mreg); 1368 } 1369 1370 static const struct sparc32_cachetlb_ops turbosparc_ops = { 1371 .cache_all = turbosparc_flush_cache_all, 1372 .cache_mm = turbosparc_flush_cache_mm, 1373 .cache_page = turbosparc_flush_cache_page, 1374 .cache_range = turbosparc_flush_cache_range, 1375 .tlb_all = turbosparc_flush_tlb_all, 1376 .tlb_mm = turbosparc_flush_tlb_mm, 1377 .tlb_page = turbosparc_flush_tlb_page, 1378 .tlb_range = turbosparc_flush_tlb_range, 1379 .page_to_ram = turbosparc_flush_page_to_ram, 1380 .sig_insns = turbosparc_flush_sig_insns, 1381 .page_for_dma = turbosparc_flush_page_for_dma, 1382 }; 1383 1384 static void __init init_turbosparc(void) 1385 { 1386 srmmu_name = "Fujitsu TurboSparc"; 1387 srmmu_modtype = TurboSparc; 1388 sparc32_cachetlb_ops = &turbosparc_ops; 1389 poke_srmmu = poke_turbosparc; 1390 } 1391 1392 static void poke_tsunami(void) 1393 { 1394 unsigned long mreg = srmmu_get_mmureg(); 1395 1396 tsunami_flush_icache(); 1397 tsunami_flush_dcache(); 1398 mreg &= ~TSUNAMI_ITD; 1399 mreg |= (TSUNAMI_IENAB | TSUNAMI_DENAB); 1400 srmmu_set_mmureg(mreg); 1401 } 1402 1403 static const struct sparc32_cachetlb_ops tsunami_ops = { 1404 .cache_all = tsunami_flush_cache_all, 1405 .cache_mm = tsunami_flush_cache_mm, 1406 .cache_page = tsunami_flush_cache_page, 1407 .cache_range = tsunami_flush_cache_range, 1408 .tlb_all = tsunami_flush_tlb_all, 1409 .tlb_mm = tsunami_flush_tlb_mm, 1410 .tlb_page = tsunami_flush_tlb_page, 1411 .tlb_range = tsunami_flush_tlb_range, 1412 .page_to_ram = tsunami_flush_page_to_ram, 1413 .sig_insns = tsunami_flush_sig_insns, 1414 .page_for_dma = tsunami_flush_page_for_dma, 1415 }; 1416 1417 static void __init init_tsunami(void) 1418 { 1419 /* 1420 * Tsunami's pretty sane, Sun and TI actually got it 1421 * somewhat right this time. Fujitsu should have 1422 * taken some lessons from them. 1423 */ 1424 1425 srmmu_name = "TI Tsunami"; 1426 srmmu_modtype = Tsunami; 1427 sparc32_cachetlb_ops = &tsunami_ops; 1428 poke_srmmu = poke_tsunami; 1429 1430 tsunami_setup_blockops(); 1431 } 1432 1433 static void poke_viking(void) 1434 { 1435 unsigned long mreg = srmmu_get_mmureg(); 1436 static int smp_catch; 1437 1438 if (viking_mxcc_present) { 1439 unsigned long mxcc_control = mxcc_get_creg(); 1440 1441 mxcc_control |= (MXCC_CTL_ECE | MXCC_CTL_PRE | MXCC_CTL_MCE); 1442 mxcc_control &= ~(MXCC_CTL_RRC); 1443 mxcc_set_creg(mxcc_control); 1444 1445 /* 1446 * We don't need memory parity checks. 1447 * XXX This is a mess, have to dig out later. ecd. 1448 viking_mxcc_turn_off_parity(&mreg, &mxcc_control); 1449 */ 1450 1451 /* We do cache ptables on MXCC. */ 1452 mreg |= VIKING_TCENABLE; 1453 } else { 1454 unsigned long bpreg; 1455 1456 mreg &= ~(VIKING_TCENABLE); 1457 if (smp_catch++) { 1458 /* Must disable mixed-cmd mode here for other cpu's. */ 1459 bpreg = viking_get_bpreg(); 1460 bpreg &= ~(VIKING_ACTION_MIX); 1461 viking_set_bpreg(bpreg); 1462 1463 /* Just in case PROM does something funny. */ 1464 msi_set_sync(); 1465 } 1466 } 1467 1468 mreg |= VIKING_SPENABLE; 1469 mreg |= (VIKING_ICENABLE | VIKING_DCENABLE); 1470 mreg |= VIKING_SBENABLE; 1471 mreg &= ~(VIKING_ACENABLE); 1472 srmmu_set_mmureg(mreg); 1473 } 1474 1475 static struct sparc32_cachetlb_ops viking_ops __ro_after_init = { 1476 .cache_all = viking_flush_cache_all, 1477 .cache_mm = viking_flush_cache_mm, 1478 .cache_page = viking_flush_cache_page, 1479 .cache_range = viking_flush_cache_range, 1480 .tlb_all = viking_flush_tlb_all, 1481 .tlb_mm = viking_flush_tlb_mm, 1482 .tlb_page = viking_flush_tlb_page, 1483 .tlb_range = viking_flush_tlb_range, 1484 .page_to_ram = viking_flush_page_to_ram, 1485 .sig_insns = viking_flush_sig_insns, 1486 .page_for_dma = viking_flush_page_for_dma, 1487 }; 1488 1489 #ifdef CONFIG_SMP 1490 /* On sun4d the cpu broadcasts local TLB flushes, so we can just 1491 * perform the local TLB flush and all the other cpus will see it. 1492 * But, unfortunately, there is a bug in the sun4d XBUS backplane 1493 * that requires that we add some synchronization to these flushes. 1494 * 1495 * The bug is that the fifo which keeps track of all the pending TLB 1496 * broadcasts in the system is an entry or two too small, so if we 1497 * have too many going at once we'll overflow that fifo and lose a TLB 1498 * flush resulting in corruption. 1499 * 1500 * Our workaround is to take a global spinlock around the TLB flushes, 1501 * which guarentees we won't ever have too many pending. It's a big 1502 * hammer, but a semaphore like system to make sure we only have N TLB 1503 * flushes going at once will require SMP locking anyways so there's 1504 * no real value in trying any harder than this. 1505 */ 1506 static struct sparc32_cachetlb_ops viking_sun4d_smp_ops __ro_after_init = { 1507 .cache_all = viking_flush_cache_all, 1508 .cache_mm = viking_flush_cache_mm, 1509 .cache_page = viking_flush_cache_page, 1510 .cache_range = viking_flush_cache_range, 1511 .tlb_all = sun4dsmp_flush_tlb_all, 1512 .tlb_mm = sun4dsmp_flush_tlb_mm, 1513 .tlb_page = sun4dsmp_flush_tlb_page, 1514 .tlb_range = sun4dsmp_flush_tlb_range, 1515 .page_to_ram = viking_flush_page_to_ram, 1516 .sig_insns = viking_flush_sig_insns, 1517 .page_for_dma = viking_flush_page_for_dma, 1518 }; 1519 #endif 1520 1521 static void __init init_viking(void) 1522 { 1523 unsigned long mreg = srmmu_get_mmureg(); 1524 1525 /* Ahhh, the viking. SRMMU VLSI abortion number two... */ 1526 if (mreg & VIKING_MMODE) { 1527 srmmu_name = "TI Viking"; 1528 viking_mxcc_present = 0; 1529 msi_set_sync(); 1530 1531 /* 1532 * We need this to make sure old viking takes no hits 1533 * on it's cache for dma snoops to workaround the 1534 * "load from non-cacheable memory" interrupt bug. 1535 * This is only necessary because of the new way in 1536 * which we use the IOMMU. 1537 */ 1538 viking_ops.page_for_dma = viking_flush_page; 1539 #ifdef CONFIG_SMP 1540 viking_sun4d_smp_ops.page_for_dma = viking_flush_page; 1541 #endif 1542 flush_page_for_dma_global = 0; 1543 } else { 1544 srmmu_name = "TI Viking/MXCC"; 1545 viking_mxcc_present = 1; 1546 srmmu_cache_pagetables = 1; 1547 } 1548 1549 sparc32_cachetlb_ops = (const struct sparc32_cachetlb_ops *) 1550 &viking_ops; 1551 #ifdef CONFIG_SMP 1552 if (sparc_cpu_model == sun4d) 1553 sparc32_cachetlb_ops = (const struct sparc32_cachetlb_ops *) 1554 &viking_sun4d_smp_ops; 1555 #endif 1556 1557 poke_srmmu = poke_viking; 1558 } 1559 1560 /* Probe for the srmmu chip version. */ 1561 static void __init get_srmmu_type(void) 1562 { 1563 unsigned long mreg, psr; 1564 unsigned long mod_typ, mod_rev, psr_typ, psr_vers; 1565 1566 srmmu_modtype = SRMMU_INVAL_MOD; 1567 hwbug_bitmask = 0; 1568 1569 mreg = srmmu_get_mmureg(); psr = get_psr(); 1570 mod_typ = (mreg & 0xf0000000) >> 28; 1571 mod_rev = (mreg & 0x0f000000) >> 24; 1572 psr_typ = (psr >> 28) & 0xf; 1573 psr_vers = (psr >> 24) & 0xf; 1574 1575 /* First, check for sparc-leon. */ 1576 if (sparc_cpu_model == sparc_leon) { 1577 init_leon(); 1578 return; 1579 } 1580 1581 /* Second, check for HyperSparc or Cypress. */ 1582 if (mod_typ == 1) { 1583 switch (mod_rev) { 1584 case 7: 1585 /* UP or MP Hypersparc */ 1586 init_hypersparc(); 1587 break; 1588 case 0: 1589 case 2: 1590 case 10: 1591 case 11: 1592 case 12: 1593 case 13: 1594 case 14: 1595 case 15: 1596 default: 1597 prom_printf("Sparc-Linux Cypress support does not longer exit.\n"); 1598 prom_halt(); 1599 break; 1600 } 1601 return; 1602 } 1603 1604 /* Now Fujitsu TurboSparc. It might happen that it is 1605 * in Swift emulation mode, so we will check later... 1606 */ 1607 if (psr_typ == 0 && psr_vers == 5) { 1608 init_turbosparc(); 1609 return; 1610 } 1611 1612 /* Next check for Fujitsu Swift. */ 1613 if (psr_typ == 0 && psr_vers == 4) { 1614 phandle cpunode; 1615 char node_str[128]; 1616 1617 /* Look if it is not a TurboSparc emulating Swift... */ 1618 cpunode = prom_getchild(prom_root_node); 1619 while ((cpunode = prom_getsibling(cpunode)) != 0) { 1620 prom_getstring(cpunode, "device_type", node_str, sizeof(node_str)); 1621 if (!strcmp(node_str, "cpu")) { 1622 if (!prom_getintdefault(cpunode, "psr-implementation", 1) && 1623 prom_getintdefault(cpunode, "psr-version", 1) == 5) { 1624 init_turbosparc(); 1625 return; 1626 } 1627 break; 1628 } 1629 } 1630 1631 init_swift(); 1632 return; 1633 } 1634 1635 /* Now the Viking family of srmmu. */ 1636 if (psr_typ == 4 && 1637 ((psr_vers == 0) || 1638 ((psr_vers == 1) && (mod_typ == 0) && (mod_rev == 0)))) { 1639 init_viking(); 1640 return; 1641 } 1642 1643 /* Finally the Tsunami. */ 1644 if (psr_typ == 4 && psr_vers == 1 && (mod_typ || mod_rev)) { 1645 init_tsunami(); 1646 return; 1647 } 1648 1649 /* Oh well */ 1650 srmmu_is_bad(); 1651 } 1652 1653 #ifdef CONFIG_SMP 1654 /* Local cross-calls. */ 1655 static void smp_flush_page_for_dma(unsigned long page) 1656 { 1657 xc1((smpfunc_t) local_ops->page_for_dma, page); 1658 local_ops->page_for_dma(page); 1659 } 1660 1661 static void smp_flush_cache_all(void) 1662 { 1663 xc0((smpfunc_t) local_ops->cache_all); 1664 local_ops->cache_all(); 1665 } 1666 1667 static void smp_flush_tlb_all(void) 1668 { 1669 xc0((smpfunc_t) local_ops->tlb_all); 1670 local_ops->tlb_all(); 1671 } 1672 1673 static void smp_flush_cache_mm(struct mm_struct *mm) 1674 { 1675 if (mm->context != NO_CONTEXT) { 1676 cpumask_t cpu_mask; 1677 cpumask_copy(&cpu_mask, mm_cpumask(mm)); 1678 cpumask_clear_cpu(smp_processor_id(), &cpu_mask); 1679 if (!cpumask_empty(&cpu_mask)) 1680 xc1((smpfunc_t) local_ops->cache_mm, (unsigned long) mm); 1681 local_ops->cache_mm(mm); 1682 } 1683 } 1684 1685 static void smp_flush_tlb_mm(struct mm_struct *mm) 1686 { 1687 if (mm->context != NO_CONTEXT) { 1688 cpumask_t cpu_mask; 1689 cpumask_copy(&cpu_mask, mm_cpumask(mm)); 1690 cpumask_clear_cpu(smp_processor_id(), &cpu_mask); 1691 if (!cpumask_empty(&cpu_mask)) { 1692 xc1((smpfunc_t) local_ops->tlb_mm, (unsigned long) mm); 1693 if (atomic_read(&mm->mm_users) == 1 && current->active_mm == mm) 1694 cpumask_copy(mm_cpumask(mm), 1695 cpumask_of(smp_processor_id())); 1696 } 1697 local_ops->tlb_mm(mm); 1698 } 1699 } 1700 1701 static void smp_flush_cache_range(struct vm_area_struct *vma, 1702 unsigned long start, 1703 unsigned long end) 1704 { 1705 struct mm_struct *mm = vma->vm_mm; 1706 1707 if (mm->context != NO_CONTEXT) { 1708 cpumask_t cpu_mask; 1709 cpumask_copy(&cpu_mask, mm_cpumask(mm)); 1710 cpumask_clear_cpu(smp_processor_id(), &cpu_mask); 1711 if (!cpumask_empty(&cpu_mask)) 1712 xc3((smpfunc_t) local_ops->cache_range, 1713 (unsigned long) vma, start, end); 1714 local_ops->cache_range(vma, start, end); 1715 } 1716 } 1717 1718 static void smp_flush_tlb_range(struct vm_area_struct *vma, 1719 unsigned long start, 1720 unsigned long end) 1721 { 1722 struct mm_struct *mm = vma->vm_mm; 1723 1724 if (mm->context != NO_CONTEXT) { 1725 cpumask_t cpu_mask; 1726 cpumask_copy(&cpu_mask, mm_cpumask(mm)); 1727 cpumask_clear_cpu(smp_processor_id(), &cpu_mask); 1728 if (!cpumask_empty(&cpu_mask)) 1729 xc3((smpfunc_t) local_ops->tlb_range, 1730 (unsigned long) vma, start, end); 1731 local_ops->tlb_range(vma, start, end); 1732 } 1733 } 1734 1735 static void smp_flush_cache_page(struct vm_area_struct *vma, unsigned long page) 1736 { 1737 struct mm_struct *mm = vma->vm_mm; 1738 1739 if (mm->context != NO_CONTEXT) { 1740 cpumask_t cpu_mask; 1741 cpumask_copy(&cpu_mask, mm_cpumask(mm)); 1742 cpumask_clear_cpu(smp_processor_id(), &cpu_mask); 1743 if (!cpumask_empty(&cpu_mask)) 1744 xc2((smpfunc_t) local_ops->cache_page, 1745 (unsigned long) vma, page); 1746 local_ops->cache_page(vma, page); 1747 } 1748 } 1749 1750 static void smp_flush_tlb_page(struct vm_area_struct *vma, unsigned long page) 1751 { 1752 struct mm_struct *mm = vma->vm_mm; 1753 1754 if (mm->context != NO_CONTEXT) { 1755 cpumask_t cpu_mask; 1756 cpumask_copy(&cpu_mask, mm_cpumask(mm)); 1757 cpumask_clear_cpu(smp_processor_id(), &cpu_mask); 1758 if (!cpumask_empty(&cpu_mask)) 1759 xc2((smpfunc_t) local_ops->tlb_page, 1760 (unsigned long) vma, page); 1761 local_ops->tlb_page(vma, page); 1762 } 1763 } 1764 1765 static void smp_flush_page_to_ram(unsigned long page) 1766 { 1767 /* Current theory is that those who call this are the one's 1768 * who have just dirtied their cache with the pages contents 1769 * in kernel space, therefore we only run this on local cpu. 1770 * 1771 * XXX This experiment failed, research further... -DaveM 1772 */ 1773 #if 1 1774 xc1((smpfunc_t) local_ops->page_to_ram, page); 1775 #endif 1776 local_ops->page_to_ram(page); 1777 } 1778 1779 static void smp_flush_sig_insns(struct mm_struct *mm, unsigned long insn_addr) 1780 { 1781 cpumask_t cpu_mask; 1782 cpumask_copy(&cpu_mask, mm_cpumask(mm)); 1783 cpumask_clear_cpu(smp_processor_id(), &cpu_mask); 1784 if (!cpumask_empty(&cpu_mask)) 1785 xc2((smpfunc_t) local_ops->sig_insns, 1786 (unsigned long) mm, insn_addr); 1787 local_ops->sig_insns(mm, insn_addr); 1788 } 1789 1790 static struct sparc32_cachetlb_ops smp_cachetlb_ops __ro_after_init = { 1791 .cache_all = smp_flush_cache_all, 1792 .cache_mm = smp_flush_cache_mm, 1793 .cache_page = smp_flush_cache_page, 1794 .cache_range = smp_flush_cache_range, 1795 .tlb_all = smp_flush_tlb_all, 1796 .tlb_mm = smp_flush_tlb_mm, 1797 .tlb_page = smp_flush_tlb_page, 1798 .tlb_range = smp_flush_tlb_range, 1799 .page_to_ram = smp_flush_page_to_ram, 1800 .sig_insns = smp_flush_sig_insns, 1801 .page_for_dma = smp_flush_page_for_dma, 1802 }; 1803 #endif 1804 1805 /* Load up routines and constants for sun4m and sun4d mmu */ 1806 void __init load_mmu(void) 1807 { 1808 /* Functions */ 1809 get_srmmu_type(); 1810 1811 #ifdef CONFIG_SMP 1812 /* El switcheroo... */ 1813 local_ops = sparc32_cachetlb_ops; 1814 1815 if (sparc_cpu_model == sun4d || sparc_cpu_model == sparc_leon) { 1816 smp_cachetlb_ops.tlb_all = local_ops->tlb_all; 1817 smp_cachetlb_ops.tlb_mm = local_ops->tlb_mm; 1818 smp_cachetlb_ops.tlb_range = local_ops->tlb_range; 1819 smp_cachetlb_ops.tlb_page = local_ops->tlb_page; 1820 } 1821 1822 if (poke_srmmu == poke_viking) { 1823 /* Avoid unnecessary cross calls. */ 1824 smp_cachetlb_ops.cache_all = local_ops->cache_all; 1825 smp_cachetlb_ops.cache_mm = local_ops->cache_mm; 1826 smp_cachetlb_ops.cache_range = local_ops->cache_range; 1827 smp_cachetlb_ops.cache_page = local_ops->cache_page; 1828 1829 smp_cachetlb_ops.page_to_ram = local_ops->page_to_ram; 1830 smp_cachetlb_ops.sig_insns = local_ops->sig_insns; 1831 smp_cachetlb_ops.page_for_dma = local_ops->page_for_dma; 1832 } 1833 1834 /* It really is const after this point. */ 1835 sparc32_cachetlb_ops = (const struct sparc32_cachetlb_ops *) 1836 &smp_cachetlb_ops; 1837 #endif 1838 1839 if (sparc_cpu_model == sun4d) 1840 ld_mmu_iounit(); 1841 else 1842 ld_mmu_iommu(); 1843 #ifdef CONFIG_SMP 1844 if (sparc_cpu_model == sun4d) 1845 sun4d_init_smp(); 1846 else if (sparc_cpu_model == sparc_leon) 1847 leon_init_smp(); 1848 else 1849 sun4m_init_smp(); 1850 #endif 1851 } 1852