git.oblomov.eu Git - linux-2.6/blob - arch/mips/mm/c-r4k.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
   7  * Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Ralf Baechle (ralf@gnu.org)
   8  * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
   9  */
  10 #include <linux/config.h>
  11 #include <linux/init.h>
  12 #include <linux/kernel.h>
  13 #include <linux/sched.h>
  14 #include <linux/mm.h>
  15 #include <linux/bitops.h>
  16
  17 #include <asm/bcache.h>
  18 #include <asm/bootinfo.h>
  19 #include <asm/cache.h>
  20 #include <asm/cacheops.h>
  21 #include <asm/cpu.h>
  22 #include <asm/cpu-features.h>
  23 #include <asm/io.h>
  24 #include <asm/page.h>
  25 #include <asm/pgtable.h>
  26 #include <asm/r4kcache.h>
  27 #include <asm/system.h>
  28 #include <asm/mmu_context.h>
  29 #include <asm/war.h>
  30 #include <asm/cacheflush.h> /* for run_uncached() */
  31
  32 /*
  33  * Must die.
  34  */
  35 static unsigned long icache_size __read_mostly;
  36 static unsigned long dcache_size __read_mostly;
  37 static unsigned long scache_size __read_mostly;
  38
  39 /*
  40  * Dummy cache handling routines for machines without boardcaches
  41  */
  42 static void no_sc_noop(void) {}
  43
  44 static struct bcache_ops no_sc_ops = {
  45         .bc_enable = (void *)no_sc_noop,
  46         .bc_disable = (void *)no_sc_noop,
  47         .bc_wback_inv = (void *)no_sc_noop,
  48         .bc_inv = (void *)no_sc_noop
  49 };
  50
  51 struct bcache_ops *bcops = &no_sc_ops;
  52
  53 #define cpu_is_r4600_v1_x()     ((read_c0_prid() & 0xfffffff0) == 0x00002010)
  54 #define cpu_is_r4600_v2_x()     ((read_c0_prid() & 0xfffffff0) == 0x00002020)
  55
  56 #define R4600_HIT_CACHEOP_WAR_IMPL                                      \
  57 do {                                                                    \
  58         if (R4600_V2_HIT_CACHEOP_WAR && cpu_is_r4600_v2_x())            \
  59                 *(volatile unsigned long *)CKSEG1;                      \
  60         if (R4600_V1_HIT_CACHEOP_WAR)                                   \
  61                 __asm__ __volatile__("nop;nop;nop;nop");                \
  62 } while (0)
  63
  64 static void (*r4k_blast_dcache_page)(unsigned long addr);
  65
  66 static inline void r4k_blast_dcache_page_dc32(unsigned long addr)
  67 {
  68         R4600_HIT_CACHEOP_WAR_IMPL;
  69         blast_dcache32_page(addr);
  70 }
  71
  72 static inline void r4k_blast_dcache_page_setup(void)
  73 {
  74         unsigned long  dc_lsize = cpu_dcache_line_size();
  75
  76         if (dc_lsize == 16)
  77                 r4k_blast_dcache_page = blast_dcache16_page;
  78         else if (dc_lsize == 32)
  79                 r4k_blast_dcache_page = r4k_blast_dcache_page_dc32;
  80 }
  81
  82 static void (* r4k_blast_dcache_page_indexed)(unsigned long addr);
  83
  84 static inline void r4k_blast_dcache_page_indexed_setup(void)
  85 {
  86         unsigned long dc_lsize = cpu_dcache_line_size();
  87
  88         if (dc_lsize == 16)
  89                 r4k_blast_dcache_page_indexed = blast_dcache16_page_indexed;
  90         else if (dc_lsize == 32)
  91                 r4k_blast_dcache_page_indexed = blast_dcache32_page_indexed;
  92 }
  93
  94 static void (* r4k_blast_dcache)(void);
  95
  96 static inline void r4k_blast_dcache_setup(void)
  97 {
  98         unsigned long dc_lsize = cpu_dcache_line_size();
  99
 100         if (dc_lsize == 16)
 101                 r4k_blast_dcache = blast_dcache16;
 102         else if (dc_lsize == 32)
 103                 r4k_blast_dcache = blast_dcache32;
 104 }
 105
 106 /* force code alignment (used for TX49XX_ICACHE_INDEX_INV_WAR) */
 107 #define JUMP_TO_ALIGN(order) \
 108         __asm__ __volatile__( \
 109                 "b\t1f\n\t" \
 110                 ".align\t" #order "\n\t" \
 111                 "1:\n\t" \
 112                 )
 113 #define CACHE32_UNROLL32_ALIGN  JUMP_TO_ALIGN(10) /* 32 * 32 = 1024 */
 114 #define CACHE32_UNROLL32_ALIGN2 JUMP_TO_ALIGN(11)
 115
 116 static inline void blast_r4600_v1_icache32(void)
 117 {
 118         unsigned long flags;
 119
 120         local_irq_save(flags);
 121         blast_icache32();
 122         local_irq_restore(flags);
 123 }
 124
 125 static inline void tx49_blast_icache32(void)
 126 {
 127         unsigned long start = INDEX_BASE;
 128         unsigned long end = start + current_cpu_data.icache.waysize;
 129         unsigned long ws_inc = 1UL << current_cpu_data.icache.waybit;
 130         unsigned long ws_end = current_cpu_data.icache.ways <<
 131                                current_cpu_data.icache.waybit;
 132         unsigned long ws, addr;
 133
 134         CACHE32_UNROLL32_ALIGN2;
 135         /* I'm in even chunk.  blast odd chunks */
 136         for (ws = 0; ws < ws_end; ws += ws_inc)
 137                 for (addr = start + 0x400; addr < end; addr += 0x400 * 2)
 138                         cache32_unroll32(addr|ws,Index_Invalidate_I);
 139         CACHE32_UNROLL32_ALIGN;
 140         /* I'm in odd chunk.  blast even chunks */
 141         for (ws = 0; ws < ws_end; ws += ws_inc)
 142                 for (addr = start; addr < end; addr += 0x400 * 2)
 143                         cache32_unroll32(addr|ws,Index_Invalidate_I);
 144 }
 145
 146 static inline void blast_icache32_r4600_v1_page_indexed(unsigned long page)
 147 {
 148         unsigned long flags;
 149
 150         local_irq_save(flags);
 151         blast_icache32_page_indexed(page);
 152         local_irq_restore(flags);
 153 }
 154
 155 static inline void tx49_blast_icache32_page_indexed(unsigned long page)
 156 {
 157         unsigned long start = page;
 158         unsigned long end = start + PAGE_SIZE;
 159         unsigned long ws_inc = 1UL << current_cpu_data.icache.waybit;
 160         unsigned long ws_end = current_cpu_data.icache.ways <<
 161                                current_cpu_data.icache.waybit;
 162         unsigned long ws, addr;
 163
 164         CACHE32_UNROLL32_ALIGN2;
 165         /* I'm in even chunk.  blast odd chunks */
 166         for (ws = 0; ws < ws_end; ws += ws_inc)
 167                 for (addr = start + 0x400; addr < end; addr += 0x400 * 2)
 168                         cache32_unroll32(addr|ws,Index_Invalidate_I);
 169         CACHE32_UNROLL32_ALIGN;
 170         /* I'm in odd chunk.  blast even chunks */
 171         for (ws = 0; ws < ws_end; ws += ws_inc)
 172                 for (addr = start; addr < end; addr += 0x400 * 2)
 173                         cache32_unroll32(addr|ws,Index_Invalidate_I);
 174 }
 175
 176 static void (* r4k_blast_icache_page)(unsigned long addr);
 177
 178 static inline void r4k_blast_icache_page_setup(void)
 179 {
 180         unsigned long ic_lsize = cpu_icache_line_size();
 181
 182         if (ic_lsize == 16)
 183                 r4k_blast_icache_page = blast_icache16_page;
 184         else if (ic_lsize == 32)
 185                 r4k_blast_icache_page = blast_icache32_page;
 186         else if (ic_lsize == 64)
 187                 r4k_blast_icache_page = blast_icache64_page;
 188 }
 189
 190
 191 static void (* r4k_blast_icache_page_indexed)(unsigned long addr);
 192
 193 static inline void r4k_blast_icache_page_indexed_setup(void)
 194 {
 195         unsigned long ic_lsize = cpu_icache_line_size();
 196
 197         if (ic_lsize == 16)
 198                 r4k_blast_icache_page_indexed = blast_icache16_page_indexed;
 199         else if (ic_lsize == 32) {
 200                 if (R4600_V1_INDEX_ICACHEOP_WAR && cpu_is_r4600_v1_x())
 201                         r4k_blast_icache_page_indexed =
 202                                 blast_icache32_r4600_v1_page_indexed;
 203                 else if (TX49XX_ICACHE_INDEX_INV_WAR)
 204                         r4k_blast_icache_page_indexed =
 205                                 tx49_blast_icache32_page_indexed;
 206                 else
 207                         r4k_blast_icache_page_indexed =
 208                                 blast_icache32_page_indexed;
 209         } else if (ic_lsize == 64)
 210                 r4k_blast_icache_page_indexed = blast_icache64_page_indexed;
 211 }
 212
 213 static void (* r4k_blast_icache)(void);
 214
 215 static inline void r4k_blast_icache_setup(void)
 216 {
 217         unsigned long ic_lsize = cpu_icache_line_size();
 218
 219         if (ic_lsize == 16)
 220                 r4k_blast_icache = blast_icache16;
 221         else if (ic_lsize == 32) {
 222                 if (R4600_V1_INDEX_ICACHEOP_WAR && cpu_is_r4600_v1_x())
 223                         r4k_blast_icache = blast_r4600_v1_icache32;
 224                 else if (TX49XX_ICACHE_INDEX_INV_WAR)
 225                         r4k_blast_icache = tx49_blast_icache32;
 226                 else
 227                         r4k_blast_icache = blast_icache32;
 228         } else if (ic_lsize == 64)
 229                 r4k_blast_icache = blast_icache64;
 230 }
 231
 232 static void (* r4k_blast_scache_page)(unsigned long addr);
 233
 234 static inline void r4k_blast_scache_page_setup(void)
 235 {
 236         unsigned long sc_lsize = cpu_scache_line_size();
 237
 238         if (sc_lsize == 16)
 239                 r4k_blast_scache_page = blast_scache16_page;
 240         else if (sc_lsize == 32)
 241                 r4k_blast_scache_page = blast_scache32_page;
 242         else if (sc_lsize == 64)
 243                 r4k_blast_scache_page = blast_scache64_page;
 244         else if (sc_lsize == 128)
 245                 r4k_blast_scache_page = blast_scache128_page;
 246 }
 247
 248 static void (* r4k_blast_scache_page_indexed)(unsigned long addr);
 249
 250 static inline void r4k_blast_scache_page_indexed_setup(void)
 251 {
 252         unsigned long sc_lsize = cpu_scache_line_size();
 253
 254         if (sc_lsize == 16)
 255                 r4k_blast_scache_page_indexed = blast_scache16_page_indexed;
 256         else if (sc_lsize == 32)
 257                 r4k_blast_scache_page_indexed = blast_scache32_page_indexed;
 258         else if (sc_lsize == 64)
 259                 r4k_blast_scache_page_indexed = blast_scache64_page_indexed;
 260         else if (sc_lsize == 128)
 261                 r4k_blast_scache_page_indexed = blast_scache128_page_indexed;
 262 }
 263
 264 static void (* r4k_blast_scache)(void);
 265
 266 static inline void r4k_blast_scache_setup(void)
 267 {
 268         unsigned long sc_lsize = cpu_scache_line_size();
 269
 270         if (sc_lsize == 16)
 271                 r4k_blast_scache = blast_scache16;
 272         else if (sc_lsize == 32)
 273                 r4k_blast_scache = blast_scache32;
 274         else if (sc_lsize == 64)
 275                 r4k_blast_scache = blast_scache64;
 276         else if (sc_lsize == 128)
 277                 r4k_blast_scache = blast_scache128;
 278 }
 279
 280 /*
 281  * This is former mm's flush_cache_all() which really should be
 282  * flush_cache_vunmap these days ...
 283  */
 284 static inline void local_r4k_flush_cache_all(void * args)
 285 {
 286         r4k_blast_dcache();
 287         r4k_blast_icache();
 288 }
 289
 290 static void r4k_flush_cache_all(void)
 291 {
 292         if (!cpu_has_dc_aliases)
 293                 return;
 294
 295         on_each_cpu(local_r4k_flush_cache_all, NULL, 1, 1);
 296 }
 297
 298 static inline void local_r4k___flush_cache_all(void * args)
 299 {
 300         r4k_blast_dcache();
 301         r4k_blast_icache();
 302
 303         switch (current_cpu_data.cputype) {
 304         case CPU_R4000SC:
 305         case CPU_R4000MC:
 306         case CPU_R4400SC:
 307         case CPU_R4400MC:
 308         case CPU_R10000:
 309         case CPU_R12000:
 310                 r4k_blast_scache();
 311         }
 312 }
 313
 314 static void r4k___flush_cache_all(void)
 315 {
 316         on_each_cpu(local_r4k___flush_cache_all, NULL, 1, 1);
 317 }
 318
 319 static inline void local_r4k_flush_cache_range(void * args)
 320 {
 321         struct vm_area_struct *vma = args;
 322         int exec;
 323
 324         if (!(cpu_context(smp_processor_id(), vma->vm_mm)))
 325                 return;
 326
 327         exec = vma->vm_flags & VM_EXEC;
 328         if (cpu_has_dc_aliases || exec)
 329                 r4k_blast_dcache();
 330         if (exec)
 331                 r4k_blast_icache();
 332 }
 333
 334 static void r4k_flush_cache_range(struct vm_area_struct *vma,
 335         unsigned long start, unsigned long end)
 336 {
 337         on_each_cpu(local_r4k_flush_cache_range, vma, 1, 1);
 338 }
 339
 340 static inline void local_r4k_flush_cache_mm(void * args)
 341 {
 342         struct mm_struct *mm = args;
 343
 344         if (!cpu_context(smp_processor_id(), mm))
 345                 return;
 346
 347         r4k_blast_dcache();
 348         r4k_blast_icache();
 349
 350         /*
 351          * Kludge alert.  For obscure reasons R4000SC and R4400SC go nuts if we
 352          * only flush the primary caches but R10000 and R12000 behave sane ...
 353          */
 354         if (current_cpu_data.cputype == CPU_R4000SC ||
 355             current_cpu_data.cputype == CPU_R4000MC ||
 356             current_cpu_data.cputype == CPU_R4400SC ||
 357             current_cpu_data.cputype == CPU_R4400MC)
 358                 r4k_blast_scache();
 359 }
 360
 361 static void r4k_flush_cache_mm(struct mm_struct *mm)
 362 {
 363         if (!cpu_has_dc_aliases)
 364                 return;
 365
 366         on_each_cpu(local_r4k_flush_cache_mm, mm, 1, 1);
 367 }
 368
 369 struct flush_cache_page_args {
 370         struct vm_area_struct *vma;
 371         unsigned long addr;
 372 };
 373
 374 static inline void local_r4k_flush_cache_page(void *args)
 375 {
 376         struct flush_cache_page_args *fcp_args = args;
 377         struct vm_area_struct *vma = fcp_args->vma;
 378         unsigned long addr = fcp_args->addr;
 379         int exec = vma->vm_flags & VM_EXEC;
 380         struct mm_struct *mm = vma->vm_mm;
 381         pgd_t *pgdp;
 382         pud_t *pudp;
 383         pmd_t *pmdp;
 384         pte_t *ptep;
 385
 386         /*
 387          * If ownes no valid ASID yet, cannot possibly have gotten
 388          * this page into the cache.
 389          */
 390         if (cpu_context(smp_processor_id(), mm) == 0)
 391                 return;
 392
 393         addr &= PAGE_MASK;
 394         pgdp = pgd_offset(mm, addr);
 395         pudp = pud_offset(pgdp, addr);
 396         pmdp = pmd_offset(pudp, addr);
 397         ptep = pte_offset(pmdp, addr);
 398
 399         /*
 400          * If the page isn't marked valid, the page cannot possibly be
 401          * in the cache.
 402          */
 403         if (!(pte_val(*ptep) & _PAGE_PRESENT))
 404                 return;
 405
 406         /*
 407          * Doing flushes for another ASID than the current one is
 408          * too difficult since stupid R4k caches do a TLB translation
 409          * for every cache flush operation.  So we do indexed flushes
 410          * in that case, which doesn't overly flush the cache too much.
 411          */
 412         if ((mm == current->active_mm) && (pte_val(*ptep) & _PAGE_VALID)) {
 413                 if (cpu_has_dc_aliases || (exec && !cpu_has_ic_fills_f_dc)) {
 414                         r4k_blast_dcache_page(addr);
 415                         if (exec && !cpu_icache_snoops_remote_store)
 416                                 r4k_blast_scache_page(addr);
 417                 }
 418                 if (exec)
 419                         r4k_blast_icache_page(addr);
 420
 421                 return;
 422         }
 423
 424         /*
 425          * Do indexed flush, too much work to get the (possible) TLB refills
 426          * to work correctly.
 427          */
 428         addr = INDEX_BASE + (addr & (dcache_size - 1));
 429         if (cpu_has_dc_aliases || (exec && !cpu_has_ic_fills_f_dc)) {
 430                 r4k_blast_dcache_page_indexed(addr);
 431                 if (exec && !cpu_icache_snoops_remote_store)
 432                         r4k_blast_scache_page_indexed(addr);
 433         }
 434         if (exec) {
 435                 if (cpu_has_vtag_icache) {
 436                         int cpu = smp_processor_id();
 437
 438                         if (cpu_context(cpu, mm) != 0)
 439                                 drop_mmu_context(mm, cpu);
 440                 } else
 441                         r4k_blast_icache_page_indexed(addr);
 442         }
 443 }
 444
 445 static void r4k_flush_cache_page(struct vm_area_struct *vma,
 446         unsigned long addr, unsigned long pfn)
 447 {
 448         struct flush_cache_page_args args;
 449
 450         args.vma = vma;
 451         args.addr = addr;
 452
 453         on_each_cpu(local_r4k_flush_cache_page, &args, 1, 1);
 454 }
 455
 456 static inline void local_r4k_flush_data_cache_page(void * addr)
 457 {
 458         r4k_blast_dcache_page((unsigned long) addr);
 459 }
 460
 461 static void r4k_flush_data_cache_page(unsigned long addr)
 462 {
 463         on_each_cpu(local_r4k_flush_data_cache_page, (void *) addr, 1, 1);
 464 }
 465
 466 struct flush_icache_range_args {
 467         unsigned long start;
 468         unsigned long end;
 469 };
 470
 471 static inline void local_r4k_flush_icache_range(void *args)
 472 {
 473         struct flush_icache_range_args *fir_args = args;
 474         unsigned long dc_lsize = cpu_dcache_line_size();
 475         unsigned long ic_lsize = cpu_icache_line_size();
 476         unsigned long sc_lsize = cpu_scache_line_size();
 477         unsigned long start = fir_args->start;
 478         unsigned long end = fir_args->end;
 479         unsigned long addr, aend;
 480
 481         if (!cpu_has_ic_fills_f_dc) {
 482                 if (end - start > dcache_size) {
 483                         r4k_blast_dcache();
 484                 } else {
 485                         R4600_HIT_CACHEOP_WAR_IMPL;
 486                         addr = start & ~(dc_lsize - 1);
 487                         aend = (end - 1) & ~(dc_lsize - 1);
 488
 489                         while (1) {
 490                                 /* Hit_Writeback_Inv_D */
 491                                 protected_writeback_dcache_line(addr);
 492                                 if (addr == aend)
 493                                         break;
 494                                 addr += dc_lsize;
 495                         }
 496                 }
 497
 498                 if (!cpu_icache_snoops_remote_store) {
 499                         if (end - start > scache_size) {
 500                                 r4k_blast_scache();
 501                         } else {
 502                                 addr = start & ~(sc_lsize - 1);
 503                                 aend = (end - 1) & ~(sc_lsize - 1);
 504
 505                                 while (1) {
 506                                         /* Hit_Writeback_Inv_SD */
 507                                         protected_writeback_scache_line(addr);
 508                                         if (addr == aend)
 509                                                 break;
 510                                         addr += sc_lsize;
 511                                 }
 512                         }
 513                 }
 514         }
 515
 516         if (end - start > icache_size)
 517                 r4k_blast_icache();
 518         else {
 519                 addr = start & ~(ic_lsize - 1);
 520                 aend = (end - 1) & ~(ic_lsize - 1);
 521                 while (1) {
 522                         /* Hit_Invalidate_I */
 523                         protected_flush_icache_line(addr);
 524                         if (addr == aend)
 525                                 break;
 526                         addr += ic_lsize;
 527                 }
 528         }
 529 }
 530
 531 static void r4k_flush_icache_range(unsigned long start, unsigned long end)
 532 {
 533         struct flush_icache_range_args args;
 534
 535         args.start = start;
 536         args.end = end;
 537
 538         on_each_cpu(local_r4k_flush_icache_range, &args, 1, 1);
 539         instruction_hazard();
 540 }
 541
 542 /*
 543  * Ok, this seriously sucks.  We use them to flush a user page but don't
 544  * know the virtual address, so we have to blast away the whole icache
 545  * which is significantly more expensive than the real thing.  Otoh we at
 546  * least know the kernel address of the page so we can flush it
 547  * selectivly.
 548  */
 549
 550 struct flush_icache_page_args {
 551         struct vm_area_struct *vma;
 552         struct page *page;
 553 };
 554
 555 static inline void local_r4k_flush_icache_page(void *args)
 556 {
 557         struct flush_icache_page_args *fip_args = args;
 558         struct vm_area_struct *vma = fip_args->vma;
 559         struct page *page = fip_args->page;
 560
 561         /*
 562          * Tricky ...  Because we don't know the virtual address we've got the
 563          * choice of either invalidating the entire primary and secondary
 564          * caches or invalidating the secondary caches also.  With the subset
 565          * enforcment on R4000SC, R4400SC, R10000 and R12000 invalidating the
 566          * secondary cache will result in any entries in the primary caches
 567          * also getting invalidated which hopefully is a bit more economical.
 568          */
 569         if (cpu_has_subset_pcaches) {
 570                 unsigned long addr = (unsigned long) page_address(page);
 571
 572                 r4k_blast_scache_page(addr);
 573                 ClearPageDcacheDirty(page);
 574
 575                 return;
 576         }
 577
 578         if (!cpu_has_ic_fills_f_dc) {
 579                 unsigned long addr = (unsigned long) page_address(page);
 580                 r4k_blast_dcache_page(addr);
 581                 if (!cpu_icache_snoops_remote_store)
 582                         r4k_blast_scache_page(addr);
 583                 ClearPageDcacheDirty(page);
 584         }
 585
 586         /*
 587          * We're not sure of the virtual address(es) involved here, so
 588          * we have to flush the entire I-cache.
 589          */
 590         if (cpu_has_vtag_icache) {
 591                 int cpu = smp_processor_id();
 592
 593                 if (cpu_context(cpu, vma->vm_mm) != 0)
 594                         drop_mmu_context(vma->vm_mm, cpu);
 595         } else
 596                 r4k_blast_icache();
 597 }
 598
 599 static void r4k_flush_icache_page(struct vm_area_struct *vma,
 600         struct page *page)
 601 {
 602         struct flush_icache_page_args args;
 603
 604         /*
 605          * If there's no context yet, or the page isn't executable, no I-cache
 606          * flush is needed.
 607          */
 608         if (!(vma->vm_flags & VM_EXEC))
 609                 return;
 610
 611         args.vma = vma;
 612         args.page = page;
 613
 614         on_each_cpu(local_r4k_flush_icache_page, &args, 1, 1);
 615 }
 616
 617
 618 #ifdef CONFIG_DMA_NONCOHERENT
 619
 620 static void r4k_dma_cache_wback_inv(unsigned long addr, unsigned long size)
 621 {
 622         unsigned long end, a;
 623
 624         /* Catch bad driver code */
 625         BUG_ON(size == 0);
 626
 627         if (cpu_has_subset_pcaches) {
 628                 unsigned long sc_lsize = cpu_scache_line_size();
 629
 630                 if (size >= scache_size) {
 631                         r4k_blast_scache();
 632                         return;
 633                 }
 634
 635                 a = addr & ~(sc_lsize - 1);
 636                 end = (addr + size - 1) & ~(sc_lsize - 1);
 637                 while (1) {
 638                         flush_scache_line(a);   /* Hit_Writeback_Inv_SD */
 639                         if (a == end)
 640                                 break;
 641                         a += sc_lsize;
 642                 }
 643                 return;
 644         }
 645
 646         /*
 647          * Either no secondary cache or the available caches don't have the
 648          * subset property so we have to flush the primary caches
 649          * explicitly
 650          */
 651         if (size >= dcache_size) {
 652                 r4k_blast_dcache();
 653         } else {
 654                 unsigned long dc_lsize = cpu_dcache_line_size();
 655
 656                 R4600_HIT_CACHEOP_WAR_IMPL;
 657                 a = addr & ~(dc_lsize - 1);
 658                 end = (addr + size - 1) & ~(dc_lsize - 1);
 659                 while (1) {
 660                         flush_dcache_line(a);   /* Hit_Writeback_Inv_D */
 661                         if (a == end)
 662                                 break;
 663                         a += dc_lsize;
 664                 }
 665         }
 666
 667         bc_wback_inv(addr, size);
 668 }
 669
 670 static void r4k_dma_cache_inv(unsigned long addr, unsigned long size)
 671 {
 672         unsigned long end, a;
 673
 674         /* Catch bad driver code */
 675         BUG_ON(size == 0);
 676
 677         if (cpu_has_subset_pcaches) {
 678                 unsigned long sc_lsize = cpu_scache_line_size();
 679
 680                 if (size >= scache_size) {
 681                         r4k_blast_scache();
 682                         return;
 683                 }
 684
 685                 a = addr & ~(sc_lsize - 1);
 686                 end = (addr + size - 1) & ~(sc_lsize - 1);
 687                 while (1) {
 688                         flush_scache_line(a);   /* Hit_Writeback_Inv_SD */
 689                         if (a == end)
 690                                 break;
 691                         a += sc_lsize;
 692                 }
 693                 return;
 694         }
 695
 696         if (size >= dcache_size) {
 697                 r4k_blast_dcache();
 698         } else {
 699                 unsigned long dc_lsize = cpu_dcache_line_size();
 700
 701                 R4600_HIT_CACHEOP_WAR_IMPL;
 702                 a = addr & ~(dc_lsize - 1);
 703                 end = (addr + size - 1) & ~(dc_lsize - 1);
 704                 while (1) {
 705                         flush_dcache_line(a);   /* Hit_Writeback_Inv_D */
 706                         if (a == end)
 707                                 break;
 708                         a += dc_lsize;
 709                 }
 710         }
 711
 712         bc_inv(addr, size);
 713 }
 714 #endif /* CONFIG_DMA_NONCOHERENT */
 715
 716 /*
 717  * While we're protected against bad userland addresses we don't care
 718  * very much about what happens in that case.  Usually a segmentation
 719  * fault will dump the process later on anyway ...
 720  */
 721 static void local_r4k_flush_cache_sigtramp(void * arg)
 722 {
 723         unsigned long ic_lsize = cpu_icache_line_size();
 724         unsigned long dc_lsize = cpu_dcache_line_size();
 725         unsigned long sc_lsize = cpu_scache_line_size();
 726         unsigned long addr = (unsigned long) arg;
 727
 728         R4600_HIT_CACHEOP_WAR_IMPL;
 729         protected_writeback_dcache_line(addr & ~(dc_lsize - 1));
 730         if (!cpu_icache_snoops_remote_store)
 731                 protected_writeback_scache_line(addr & ~(sc_lsize - 1));
 732         protected_flush_icache_line(addr & ~(ic_lsize - 1));
 733         if (MIPS4K_ICACHE_REFILL_WAR) {
 734                 __asm__ __volatile__ (
 735                         ".set push\n\t"
 736                         ".set noat\n\t"
 737                         ".set mips3\n\t"
 738 #ifdef CONFIG_32BIT
 739                         "la     $at,1f\n\t"
 740 #endif
 741 #ifdef CONFIG_64BIT
 742                         "dla    $at,1f\n\t"
 743 #endif
 744                         "cache  %0,($at)\n\t"
 745                         "nop; nop; nop\n"
 746                         "1:\n\t"
 747                         ".set pop"
 748                         :
 749                         : "i" (Hit_Invalidate_I));
 750         }
 751         if (MIPS_CACHE_SYNC_WAR)
 752                 __asm__ __volatile__ ("sync");
 753 }
 754
 755 static void r4k_flush_cache_sigtramp(unsigned long addr)
 756 {
 757         on_each_cpu(local_r4k_flush_cache_sigtramp, (void *) addr, 1, 1);
 758 }
 759
 760 static void r4k_flush_icache_all(void)
 761 {
 762         if (cpu_has_vtag_icache)
 763                 r4k_blast_icache();
 764 }
 765
 766 static inline void rm7k_erratum31(void)
 767 {
 768         const unsigned long ic_lsize = 32;
 769         unsigned long addr;
 770
 771         /* RM7000 erratum #31. The icache is screwed at startup. */
 772         write_c0_taglo(0);
 773         write_c0_taghi(0);
 774
 775         for (addr = INDEX_BASE; addr <= INDEX_BASE + 4096; addr += ic_lsize) {
 776                 __asm__ __volatile__ (
 777                         ".set push\n\t"
 778                         ".set noreorder\n\t"
 779                         ".set mips3\n\t"
 780                         "cache\t%1, 0(%0)\n\t"
 781                         "cache\t%1, 0x1000(%0)\n\t"
 782                         "cache\t%1, 0x2000(%0)\n\t"
 783                         "cache\t%1, 0x3000(%0)\n\t"
 784                         "cache\t%2, 0(%0)\n\t"
 785                         "cache\t%2, 0x1000(%0)\n\t"
 786                         "cache\t%2, 0x2000(%0)\n\t"
 787                         "cache\t%2, 0x3000(%0)\n\t"
 788                         "cache\t%1, 0(%0)\n\t"
 789                         "cache\t%1, 0x1000(%0)\n\t"
 790                         "cache\t%1, 0x2000(%0)\n\t"
 791                         "cache\t%1, 0x3000(%0)\n\t"
 792                         ".set pop\n"
 793                         :
 794                         : "r" (addr), "i" (Index_Store_Tag_I), "i" (Fill));
 795         }
 796 }
 797
 798 static char *way_string[] __initdata = { NULL, "direct mapped", "2-way",
 799         "3-way", "4-way", "5-way", "6-way", "7-way", "8-way"
 800 };
 801
 802 static void __init probe_pcache(void)
 803 {
 804         struct cpuinfo_mips *c = &current_cpu_data;
 805         unsigned int config = read_c0_config();
 806         unsigned int prid = read_c0_prid();
 807         unsigned long config1;
 808         unsigned int lsize;
 809
 810         switch (c->cputype) {
 811         case CPU_R4600:                 /* QED style two way caches? */
 812         case CPU_R4700:
 813         case CPU_R5000:
 814         case CPU_NEVADA:
 815                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 816                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 817                 c->icache.ways = 2;
 818                 c->icache.waybit = ffs(icache_size/2) - 1;
 819
 820                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
 821                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 822                 c->dcache.ways = 2;
 823                 c->dcache.waybit= ffs(dcache_size/2) - 1;
 824
 825                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 826                 break;
 827
 828         case CPU_R5432:
 829         case CPU_R5500:
 830                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 831                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 832                 c->icache.ways = 2;
 833                 c->icache.waybit= 0;
 834
 835                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
 836                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 837                 c->dcache.ways = 2;
 838                 c->dcache.waybit = 0;
 839
 840                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 841                 break;
 842
 843         case CPU_TX49XX:
 844                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 845                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 846                 c->icache.ways = 4;
 847                 c->icache.waybit= 0;
 848
 849                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
 850                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 851                 c->dcache.ways = 4;
 852                 c->dcache.waybit = 0;
 853
 854                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 855                 break;
 856
 857         case CPU_R4000PC:
 858         case CPU_R4000SC:
 859         case CPU_R4000MC:
 860         case CPU_R4400PC:
 861         case CPU_R4400SC:
 862         case CPU_R4400MC:
 863         case CPU_R4300:
 864                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 865                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 866                 c->icache.ways = 1;
 867                 c->icache.waybit = 0;   /* doesn't matter */
 868
 869                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
 870                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 871                 c->dcache.ways = 1;
 872                 c->dcache.waybit = 0;   /* does not matter */
 873
 874                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 875                 break;
 876
 877         case CPU_R10000:
 878         case CPU_R12000:
 879                 icache_size = 1 << (12 + ((config & R10K_CONF_IC) >> 29));
 880                 c->icache.linesz = 64;
 881                 c->icache.ways = 2;
 882                 c->icache.waybit = 0;
 883
 884                 dcache_size = 1 << (12 + ((config & R10K_CONF_DC) >> 26));
 885                 c->dcache.linesz = 32;
 886                 c->dcache.ways = 2;
 887                 c->dcache.waybit = 0;
 888
 889                 c->options |= MIPS_CPU_PREFETCH;
 890                 break;
 891
 892         case CPU_VR4133:
 893                 write_c0_config(config & ~CONF_EB);
 894         case CPU_VR4131:
 895                 /* Workaround for cache instruction bug of VR4131 */
 896                 if (c->processor_id == 0x0c80U || c->processor_id == 0x0c81U ||
 897                     c->processor_id == 0x0c82U) {
 898                         config &= ~0x00000030U;
 899                         config |= 0x00410000U;
 900                         write_c0_config(config);
 901                 }
 902                 icache_size = 1 << (10 + ((config & CONF_IC) >> 9));
 903                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 904                 c->icache.ways = 2;
 905                 c->icache.waybit = ffs(icache_size/2) - 1;
 906
 907                 dcache_size = 1 << (10 + ((config & CONF_DC) >> 6));
 908                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 909                 c->dcache.ways = 2;
 910                 c->dcache.waybit = ffs(dcache_size/2) - 1;
 911
 912                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 913                 break;
 914
 915         case CPU_VR41XX:
 916         case CPU_VR4111:
 917         case CPU_VR4121:
 918         case CPU_VR4122:
 919         case CPU_VR4181:
 920         case CPU_VR4181A:
 921                 icache_size = 1 << (10 + ((config & CONF_IC) >> 9));
 922                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 923                 c->icache.ways = 1;
 924                 c->icache.waybit = 0;   /* doesn't matter */
 925
 926                 dcache_size = 1 << (10 + ((config & CONF_DC) >> 6));
 927                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 928                 c->dcache.ways = 1;
 929                 c->dcache.waybit = 0;   /* does not matter */
 930
 931                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 932                 break;
 933
 934         case CPU_RM7000:
 935                 rm7k_erratum31();
 936
 937         case CPU_RM9000:
 938                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 939                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 940                 c->icache.ways = 4;
 941                 c->icache.waybit = ffs(icache_size / c->icache.ways) - 1;
 942
 943                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
 944                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 945                 c->dcache.ways = 4;
 946                 c->dcache.waybit = ffs(dcache_size / c->dcache.ways) - 1;
 947
 948 #if !defined(CONFIG_SMP) || !defined(RM9000_CDEX_SMP_WAR)
 949                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 950 #endif
 951                 c->options |= MIPS_CPU_PREFETCH;
 952                 break;
 953
 954         default:
 955                 if (!(config & MIPS_CONF_M))
 956                         panic("Don't know how to probe P-caches on this cpu.");
 957
 958                 /*
 959                  * So we seem to be a MIPS32 or MIPS64 CPU
 960                  * So let's probe the I-cache ...
 961                  */
 962                 config1 = read_c0_config1();
 963
 964                 if ((lsize = ((config1 >> 19) & 7)))
 965                         c->icache.linesz = 2 << lsize;
 966                 else
 967                         c->icache.linesz = lsize;
 968                 c->icache.sets = 64 << ((config1 >> 22) & 7);
 969                 c->icache.ways = 1 + ((config1 >> 16) & 7);
 970
 971                 icache_size = c->icache.sets *
 972                               c->icache.ways *
 973                               c->icache.linesz;
 974                 c->icache.waybit = ffs(icache_size/c->icache.ways) - 1;
 975
 976                 if (config & 0x8)               /* VI bit */
 977                         c->icache.flags |= MIPS_CACHE_VTAG;
 978
 979                 /*
 980                  * Now probe the MIPS32 / MIPS64 data cache.
 981                  */
 982                 c->dcache.flags = 0;
 983
 984                 if ((lsize = ((config1 >> 10) & 7)))
 985                         c->dcache.linesz = 2 << lsize;
 986                 else
 987                         c->dcache.linesz= lsize;
 988                 c->dcache.sets = 64 << ((config1 >> 13) & 7);
 989                 c->dcache.ways = 1 + ((config1 >> 7) & 7);
 990
 991                 dcache_size = c->dcache.sets *
 992                               c->dcache.ways *
 993                               c->dcache.linesz;
 994                 c->dcache.waybit = ffs(dcache_size/c->dcache.ways) - 1;
 995
 996                 c->options |= MIPS_CPU_PREFETCH;
 997                 break;
 998         }
 999
1000         /*
1001          * Processor configuration sanity check for the R4000SC erratum
1002          * #5.  With page sizes larger than 32kB there is no possibility
1003          * to get a VCE exception anymore so we don't care about this
1004          * misconfiguration.  The case is rather theoretical anyway;
1005          * presumably no vendor is shipping his hardware in the "bad"
1006          * configuration.
1007          */
1008         if ((prid & 0xff00) == PRID_IMP_R4000 && (prid & 0xff) < 0x40 &&
1009             !(config & CONF_SC) && c->icache.linesz != 16 &&
1010             PAGE_SIZE <= 0x8000)
1011                 panic("Improper R4000SC processor configuration detected");
1012
1013         /* compute a couple of other cache variables */
1014         c->icache.waysize = icache_size / c->icache.ways;
1015         c->dcache.waysize = dcache_size / c->dcache.ways;
1016
1017         c->icache.sets = icache_size / (c->icache.linesz * c->icache.ways);
1018         c->dcache.sets = dcache_size / (c->dcache.linesz * c->dcache.ways);
1019
1020         /*
1021          * R10000 and R12000 P-caches are odd in a positive way.  They're 32kB
1022          * 2-way virtually indexed so normally would suffer from aliases.  So
1023          * normally they'd suffer from aliases but magic in the hardware deals
1024          * with that for us so we don't need to take care ourselves.
1025          */
1026         switch (c->cputype) {
1027         case CPU_20KC:
1028         case CPU_25KF:
1029         case CPU_R10000:
1030         case CPU_R12000:
1031         case CPU_SB1:
1032                 break;
1033         case CPU_24K:
1034                 if (!(read_c0_config7() & (1 << 16)))
1035         default:
1036                         if (c->dcache.waysize > PAGE_SIZE)
1037                                 c->dcache.flags |= MIPS_CACHE_ALIASES;
1038         }
1039
1040         switch (c->cputype) {
1041         case CPU_20KC:
1042                 /*
1043                  * Some older 20Kc chips doesn't have the 'VI' bit in
1044                  * the config register.
1045                  */
1046                 c->icache.flags |= MIPS_CACHE_VTAG;
1047                 break;
1048
1049         case CPU_AU1000:
1050         case CPU_AU1500:
1051         case CPU_AU1100:
1052         case CPU_AU1550:
1053         case CPU_AU1200:
1054                 c->icache.flags |= MIPS_CACHE_IC_F_DC;
1055                 break;
1056         }
1057
1058         printk("Primary instruction cache %ldkB, %s, %s, linesize %d bytes.\n",
1059                icache_size >> 10,
1060                cpu_has_vtag_icache ? "virtually tagged" : "physically tagged",
1061                way_string[c->icache.ways], c->icache.linesz);
1062
1063         printk("Primary data cache %ldkB, %s, linesize %d bytes.\n",
1064                dcache_size >> 10, way_string[c->dcache.ways], c->dcache.linesz);
1065 }
1066
1067 /*
1068  * If you even _breathe_ on this function, look at the gcc output and make sure
1069  * it does not pop things on and off the stack for the cache sizing loop that
1070  * executes in KSEG1 space or else you will crash and burn badly.  You have
1071  * been warned.
1072  */
1073 static int __init probe_scache(void)
1074 {
1075         extern unsigned long stext;
1076         unsigned long flags, addr, begin, end, pow2;
1077         unsigned int config = read_c0_config();
1078         struct cpuinfo_mips *c = &current_cpu_data;
1079         int tmp;
1080
1081         if (config & CONF_SC)
1082                 return 0;
1083
1084         begin = (unsigned long) &stext;
1085         begin &= ~((4 * 1024 * 1024) - 1);
1086         end = begin + (4 * 1024 * 1024);
1087
1088         /*
1089          * This is such a bitch, you'd think they would make it easy to do
1090          * this.  Away you daemons of stupidity!
1091          */
1092         local_irq_save(flags);
1093
1094         /* Fill each size-multiple cache line with a valid tag. */
1095         pow2 = (64 * 1024);
1096         for (addr = begin; addr < end; addr = (begin + pow2)) {
1097                 unsigned long *p = (unsigned long *) addr;
1098                 __asm__ __volatile__("nop" : : "r" (*p)); /* whee... */
1099                 pow2 <<= 1;
1100         }
1101
1102         /* Load first line with zero (therefore invalid) tag. */
1103         write_c0_taglo(0);
1104         write_c0_taghi(0);
1105         __asm__ __volatile__("nop; nop; nop; nop;"); /* avoid the hazard */
1106         cache_op(Index_Store_Tag_I, begin);
1107         cache_op(Index_Store_Tag_D, begin);
1108         cache_op(Index_Store_Tag_SD, begin);
1109
1110         /* Now search for the wrap around point. */
1111         pow2 = (128 * 1024);
1112         tmp = 0;
1113         for (addr = begin + (128 * 1024); addr < end; addr = begin + pow2) {
1114                 cache_op(Index_Load_Tag_SD, addr);
1115                 __asm__ __volatile__("nop; nop; nop; nop;"); /* hazard... */
1116                 if (!read_c0_taglo())
1117                         break;
1118                 pow2 <<= 1;
1119         }
1120         local_irq_restore(flags);
1121         addr -= begin;
1122
1123         scache_size = addr;
1124         c->scache.linesz = 16 << ((config & R4K_CONF_SB) >> 22);
1125         c->scache.ways = 1;
1126         c->dcache.waybit = 0;           /* does not matter */
1127
1128         return 1;
1129 }
1130
1131 extern int r5k_sc_init(void);
1132 extern int rm7k_sc_init(void);
1133
1134 static void __init setup_scache(void)
1135 {
1136         struct cpuinfo_mips *c = &current_cpu_data;
1137         unsigned int config = read_c0_config();
1138         int sc_present = 0;
1139
1140         /*
1141          * Do the probing thing on R4000SC and R4400SC processors.  Other
1142          * processors don't have a S-cache that would be relevant to the
1143          * Linux memory managment.
1144          */
1145         switch (c->cputype) {
1146         case CPU_R4000SC:
1147         case CPU_R4000MC:
1148         case CPU_R4400SC:
1149         case CPU_R4400MC:
1150                 sc_present = run_uncached(probe_scache);
1151                 if (sc_present)
1152                         c->options |= MIPS_CPU_CACHE_CDEX_S;
1153                 break;
1154
1155         case CPU_R10000:
1156         case CPU_R12000:
1157                 scache_size = 0x80000 << ((config & R10K_CONF_SS) >> 16);
1158                 c->scache.linesz = 64 << ((config >> 13) & 1);
1159                 c->scache.ways = 2;
1160                 c->scache.waybit= 0;
1161                 sc_present = 1;
1162                 break;
1163
1164         case CPU_R5000:
1165         case CPU_NEVADA:
1166 #ifdef CONFIG_R5000_CPU_SCACHE
1167                 r5k_sc_init();
1168 #endif
1169                 return;
1170
1171         case CPU_RM7000:
1172         case CPU_RM9000:
1173 #ifdef CONFIG_RM7000_CPU_SCACHE
1174                 rm7k_sc_init();
1175 #endif
1176                 return;
1177
1178         default:
1179                 sc_present = 0;
1180         }
1181
1182         if (!sc_present)
1183                 return;
1184
1185         if ((c->isa_level == MIPS_CPU_ISA_M32R1 ||
1186              c->isa_level == MIPS_CPU_ISA_M64R1) &&
1187             !(c->scache.flags & MIPS_CACHE_NOT_PRESENT))
1188                 panic("Dunno how to handle MIPS32 / MIPS64 second level cache");
1189
1190         /* compute a couple of other cache variables */
1191         c->scache.waysize = scache_size / c->scache.ways;
1192
1193         c->scache.sets = scache_size / (c->scache.linesz * c->scache.ways);
1194
1195         printk("Unified secondary cache %ldkB %s, linesize %d bytes.\n",
1196                scache_size >> 10, way_string[c->scache.ways], c->scache.linesz);
1197
1198         c->options |= MIPS_CPU_SUBSET_CACHES;
1199 }
1200
1201 static inline void coherency_setup(void)
1202 {
1203         change_c0_config(CONF_CM_CMASK, CONF_CM_DEFAULT);
1204
1205         /*
1206          * c0_status.cu=0 specifies that updates by the sc instruction use
1207          * the coherency mode specified by the TLB; 1 means cachable
1208          * coherent update on write will be used.  Not all processors have
1209          * this bit and; some wire it to zero, others like Toshiba had the
1210          * silly idea of putting something else there ...
1211          */
1212         switch (current_cpu_data.cputype) {
1213         case CPU_R4000PC:
1214         case CPU_R4000SC:
1215         case CPU_R4000MC:
1216         case CPU_R4400PC:
1217         case CPU_R4400SC:
1218         case CPU_R4400MC:
1219                 clear_c0_config(CONF_CU);
1220                 break;
1221         }
1222 }
1223
1224 void __init r4k_cache_init(void)
1225 {
1226         extern void build_clear_page(void);
1227         extern void build_copy_page(void);
1228         extern char except_vec2_generic;
1229         struct cpuinfo_mips *c = &current_cpu_data;
1230
1231         /* Default cache error handler for R4000 and R5000 family */
1232         set_uncached_handler (0x100, &except_vec2_generic, 0x80);
1233
1234         probe_pcache();
1235         setup_scache();
1236
1237         r4k_blast_dcache_page_setup();
1238         r4k_blast_dcache_page_indexed_setup();
1239         r4k_blast_dcache_setup();
1240         r4k_blast_icache_page_setup();
1241         r4k_blast_icache_page_indexed_setup();
1242         r4k_blast_icache_setup();
1243         r4k_blast_scache_page_setup();
1244         r4k_blast_scache_page_indexed_setup();
1245         r4k_blast_scache_setup();
1246
1247         /*
1248          * Some MIPS32 and MIPS64 processors have physically indexed caches.
1249          * This code supports virtually indexed processors and will be
1250          * unnecessarily inefficient on physically indexed processors.
1251          */
1252         shm_align_mask = max_t( unsigned long,
1253                                 c->dcache.sets * c->dcache.linesz - 1,
1254                                 PAGE_SIZE - 1);
1255
1256         flush_cache_all         = r4k_flush_cache_all;
1257         __flush_cache_all       = r4k___flush_cache_all;
1258         flush_cache_mm          = r4k_flush_cache_mm;
1259         flush_cache_page        = r4k_flush_cache_page;
1260         flush_icache_page       = r4k_flush_icache_page;
1261         flush_cache_range       = r4k_flush_cache_range;
1262
1263         flush_cache_sigtramp    = r4k_flush_cache_sigtramp;
1264         flush_icache_all        = r4k_flush_icache_all;
1265         flush_data_cache_page   = r4k_flush_data_cache_page;
1266         flush_icache_range      = r4k_flush_icache_range;
1267
1268 #ifdef CONFIG_DMA_NONCOHERENT
1269         _dma_cache_wback_inv    = r4k_dma_cache_wback_inv;
1270         _dma_cache_wback        = r4k_dma_cache_wback_inv;
1271         _dma_cache_inv          = r4k_dma_cache_inv;
1272 #endif
1273
1274         build_clear_page();
1275         build_copy_page();
1276         local_r4k___flush_cache_all(NULL);
1277         coherency_setup();
1278 }