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/cacheops.h>
  20 #include <asm/cpu.h>
  21 #include <asm/cpu-features.h>
  22 #include <asm/io.h>
  23 #include <asm/page.h>
  24 #include <asm/pgtable.h>
  25 #include <asm/r4kcache.h>
  26 #include <asm/system.h>
  27 #include <asm/mmu_context.h>
  28 #include <asm/war.h>
  29
  30 static unsigned long icache_size, dcache_size, scache_size;
  31
  32 /*
  33  * Dummy cache handling routines for machines without boardcaches
  34  */
  35 static void no_sc_noop(void) {}
  36
  37 static struct bcache_ops no_sc_ops = {
  38         .bc_enable = (void *)no_sc_noop,
  39         .bc_disable = (void *)no_sc_noop,
  40         .bc_wback_inv = (void *)no_sc_noop,
  41         .bc_inv = (void *)no_sc_noop
  42 };
  43
  44 struct bcache_ops *bcops = &no_sc_ops;
  45
  46 #define cpu_is_r4600_v1_x()     ((read_c0_prid() & 0xfffffff0) == 0x2010)
  47 #define cpu_is_r4600_v2_x()     ((read_c0_prid() & 0xfffffff0) == 0x2020)
  48
  49 #define R4600_HIT_CACHEOP_WAR_IMPL                                      \
  50 do {                                                                    \
  51         if (R4600_V2_HIT_CACHEOP_WAR && cpu_is_r4600_v2_x())            \
  52                 *(volatile unsigned long *)CKSEG1;                      \
  53         if (R4600_V1_HIT_CACHEOP_WAR)                                   \
  54                 __asm__ __volatile__("nop;nop;nop;nop");                \
  55 } while (0)
  56
  57 static void (*r4k_blast_dcache_page)(unsigned long addr);
  58
  59 static inline void r4k_blast_dcache_page_dc32(unsigned long addr)
  60 {
  61         R4600_HIT_CACHEOP_WAR_IMPL;
  62         blast_dcache32_page(addr);
  63 }
  64
  65 static inline void r4k_blast_dcache_page_setup(void)
  66 {
  67         unsigned long  dc_lsize = cpu_dcache_line_size();
  68
  69         if (dc_lsize == 16)
  70                 r4k_blast_dcache_page = blast_dcache16_page;
  71         else if (dc_lsize == 32)
  72                 r4k_blast_dcache_page = r4k_blast_dcache_page_dc32;
  73 }
  74
  75 static void (* r4k_blast_dcache_page_indexed)(unsigned long addr);
  76
  77 static inline void r4k_blast_dcache_page_indexed_setup(void)
  78 {
  79         unsigned long dc_lsize = cpu_dcache_line_size();
  80
  81         if (dc_lsize == 16)
  82                 r4k_blast_dcache_page_indexed = blast_dcache16_page_indexed;
  83         else if (dc_lsize == 32)
  84                 r4k_blast_dcache_page_indexed = blast_dcache32_page_indexed;
  85 }
  86
  87 static void (* r4k_blast_dcache)(void);
  88
  89 static inline void r4k_blast_dcache_setup(void)
  90 {
  91         unsigned long dc_lsize = cpu_dcache_line_size();
  92
  93         if (dc_lsize == 16)
  94                 r4k_blast_dcache = blast_dcache16;
  95         else if (dc_lsize == 32)
  96                 r4k_blast_dcache = blast_dcache32;
  97 }
  98
  99 /* force code alignment (used for TX49XX_ICACHE_INDEX_INV_WAR) */
 100 #define JUMP_TO_ALIGN(order) \
 101         __asm__ __volatile__( \
 102                 "b\t1f\n\t" \
 103                 ".align\t" #order "\n\t" \
 104                 "1:\n\t" \
 105                 )
 106 #define CACHE32_UNROLL32_ALIGN  JUMP_TO_ALIGN(10) /* 32 * 32 = 1024 */
 107 #define CACHE32_UNROLL32_ALIGN2 JUMP_TO_ALIGN(11)
 108
 109 static inline void blast_r4600_v1_icache32(void)
 110 {
 111         unsigned long flags;
 112
 113         local_irq_save(flags);
 114         blast_icache32();
 115         local_irq_restore(flags);
 116 }
 117
 118 static inline void tx49_blast_icache32(void)
 119 {
 120         unsigned long start = INDEX_BASE;
 121         unsigned long end = start + current_cpu_data.icache.waysize;
 122         unsigned long ws_inc = 1UL << current_cpu_data.icache.waybit;
 123         unsigned long ws_end = current_cpu_data.icache.ways <<
 124                                current_cpu_data.icache.waybit;
 125         unsigned long ws, addr;
 126
 127         CACHE32_UNROLL32_ALIGN2;
 128         /* I'm in even chunk.  blast odd chunks */
 129         for (ws = 0; ws < ws_end; ws += ws_inc)
 130                 for (addr = start + 0x400; addr < end; addr += 0x400 * 2)
 131                         cache32_unroll32(addr|ws,Index_Invalidate_I);
 132         CACHE32_UNROLL32_ALIGN;
 133         /* I'm in odd chunk.  blast even chunks */
 134         for (ws = 0; ws < ws_end; ws += ws_inc)
 135                 for (addr = start; addr < end; addr += 0x400 * 2)
 136                         cache32_unroll32(addr|ws,Index_Invalidate_I);
 137 }
 138
 139 static inline void blast_icache32_r4600_v1_page_indexed(unsigned long page)
 140 {
 141         unsigned long flags;
 142
 143         local_irq_save(flags);
 144         blast_icache32_page_indexed(page);
 145         local_irq_restore(flags);
 146 }
 147
 148 static inline void tx49_blast_icache32_page_indexed(unsigned long page)
 149 {
 150         unsigned long start = page;
 151         unsigned long end = start + PAGE_SIZE;
 152         unsigned long ws_inc = 1UL << current_cpu_data.icache.waybit;
 153         unsigned long ws_end = current_cpu_data.icache.ways <<
 154                                current_cpu_data.icache.waybit;
 155         unsigned long ws, addr;
 156
 157         CACHE32_UNROLL32_ALIGN2;
 158         /* I'm in even chunk.  blast odd chunks */
 159         for (ws = 0; ws < ws_end; ws += ws_inc)
 160                 for (addr = start + 0x400; addr < end; addr += 0x400 * 2)
 161                         cache32_unroll32(addr|ws,Index_Invalidate_I);
 162         CACHE32_UNROLL32_ALIGN;
 163         /* I'm in odd chunk.  blast even chunks */
 164         for (ws = 0; ws < ws_end; ws += ws_inc)
 165                 for (addr = start; addr < end; addr += 0x400 * 2)
 166                         cache32_unroll32(addr|ws,Index_Invalidate_I);
 167 }
 168
 169 static void (* r4k_blast_icache_page)(unsigned long addr);
 170
 171 static inline void r4k_blast_icache_page_setup(void)
 172 {
 173         unsigned long ic_lsize = cpu_icache_line_size();
 174
 175         if (ic_lsize == 16)
 176                 r4k_blast_icache_page = blast_icache16_page;
 177         else if (ic_lsize == 32)
 178                 r4k_blast_icache_page = blast_icache32_page;
 179         else if (ic_lsize == 64)
 180                 r4k_blast_icache_page = blast_icache64_page;
 181 }
 182
 183
 184 static void (* r4k_blast_icache_page_indexed)(unsigned long addr);
 185
 186 static inline void r4k_blast_icache_page_indexed_setup(void)
 187 {
 188         unsigned long ic_lsize = cpu_icache_line_size();
 189
 190         if (ic_lsize == 16)
 191                 r4k_blast_icache_page_indexed = blast_icache16_page_indexed;
 192         else if (ic_lsize == 32) {
 193                 if (TX49XX_ICACHE_INDEX_INV_WAR)
 194                         r4k_blast_icache_page_indexed =
 195                                 tx49_blast_icache32_page_indexed;
 196                 else if (R4600_V1_INDEX_ICACHEOP_WAR && cpu_is_r4600_v1_x())
 197                         r4k_blast_icache_page_indexed =
 198                                 blast_icache32_r4600_v1_page_indexed;
 199                 else
 200                         r4k_blast_icache_page_indexed =
 201                                 blast_icache32_page_indexed;
 202         } else if (ic_lsize == 64)
 203                 r4k_blast_icache_page_indexed = blast_icache64_page_indexed;
 204 }
 205
 206 static void (* r4k_blast_icache)(void);
 207
 208 static inline void r4k_blast_icache_setup(void)
 209 {
 210         unsigned long ic_lsize = cpu_icache_line_size();
 211
 212         if (ic_lsize == 16)
 213                 r4k_blast_icache = blast_icache16;
 214         else if (ic_lsize == 32) {
 215                 if (R4600_V1_INDEX_ICACHEOP_WAR && cpu_is_r4600_v1_x())
 216                         r4k_blast_icache = blast_r4600_v1_icache32;
 217                 else if (TX49XX_ICACHE_INDEX_INV_WAR)
 218                         r4k_blast_icache = tx49_blast_icache32;
 219                 else
 220                         r4k_blast_icache = blast_icache32;
 221         } else if (ic_lsize == 64)
 222                 r4k_blast_icache = blast_icache64;
 223 }
 224
 225 static void (* r4k_blast_scache_page)(unsigned long addr);
 226
 227 static inline void r4k_blast_scache_page_setup(void)
 228 {
 229         unsigned long sc_lsize = cpu_scache_line_size();
 230
 231         if (sc_lsize == 16)
 232                 r4k_blast_scache_page = blast_scache16_page;
 233         else if (sc_lsize == 32)
 234                 r4k_blast_scache_page = blast_scache32_page;
 235         else if (sc_lsize == 64)
 236                 r4k_blast_scache_page = blast_scache64_page;
 237         else if (sc_lsize == 128)
 238                 r4k_blast_scache_page = blast_scache128_page;
 239 }
 240
 241 static void (* r4k_blast_scache_page_indexed)(unsigned long addr);
 242
 243 static inline void r4k_blast_scache_page_indexed_setup(void)
 244 {
 245         unsigned long sc_lsize = cpu_scache_line_size();
 246
 247         if (sc_lsize == 16)
 248                 r4k_blast_scache_page_indexed = blast_scache16_page_indexed;
 249         else if (sc_lsize == 32)
 250                 r4k_blast_scache_page_indexed = blast_scache32_page_indexed;
 251         else if (sc_lsize == 64)
 252                 r4k_blast_scache_page_indexed = blast_scache64_page_indexed;
 253         else if (sc_lsize == 128)
 254                 r4k_blast_scache_page_indexed = blast_scache128_page_indexed;
 255 }
 256
 257 static void (* r4k_blast_scache)(void);
 258
 259 static inline void r4k_blast_scache_setup(void)
 260 {
 261         unsigned long sc_lsize = cpu_scache_line_size();
 262
 263         if (sc_lsize == 16)
 264                 r4k_blast_scache = blast_scache16;
 265         else if (sc_lsize == 32)
 266                 r4k_blast_scache = blast_scache32;
 267         else if (sc_lsize == 64)
 268                 r4k_blast_scache = blast_scache64;
 269         else if (sc_lsize == 128)
 270                 r4k_blast_scache = blast_scache128;
 271 }
 272
 273 /*
 274  * This is former mm's flush_cache_all() which really should be
 275  * flush_cache_vunmap these days ...
 276  */
 277 static inline void local_r4k_flush_cache_all(void * args)
 278 {
 279         r4k_blast_dcache();
 280         r4k_blast_icache();
 281 }
 282
 283 static void r4k_flush_cache_all(void)
 284 {
 285         if (!cpu_has_dc_aliases)
 286                 return;
 287
 288         on_each_cpu(local_r4k_flush_cache_all, NULL, 1, 1);
 289 }
 290
 291 static inline void local_r4k___flush_cache_all(void * args)
 292 {
 293         r4k_blast_dcache();
 294         r4k_blast_icache();
 295
 296         switch (current_cpu_data.cputype) {
 297         case CPU_R4000SC:
 298         case CPU_R4000MC:
 299         case CPU_R4400SC:
 300         case CPU_R4400MC:
 301         case CPU_R10000:
 302         case CPU_R12000:
 303                 r4k_blast_scache();
 304         }
 305 }
 306
 307 static void r4k___flush_cache_all(void)
 308 {
 309         on_each_cpu(local_r4k___flush_cache_all, NULL, 1, 1);
 310 }
 311
 312 static inline void local_r4k_flush_cache_range(void * args)
 313 {
 314         struct vm_area_struct *vma = args;
 315         int exec;
 316
 317         if (!(cpu_context(smp_processor_id(), vma->vm_mm)))
 318                 return;
 319
 320         exec = vma->vm_flags & VM_EXEC;
 321         if (cpu_has_dc_aliases || exec)
 322                 r4k_blast_dcache();
 323         if (exec)
 324                 r4k_blast_icache();
 325 }
 326
 327 static void r4k_flush_cache_range(struct vm_area_struct *vma,
 328         unsigned long start, unsigned long end)
 329 {
 330         on_each_cpu(local_r4k_flush_cache_range, vma, 1, 1);
 331 }
 332
 333 static inline void local_r4k_flush_cache_mm(void * args)
 334 {
 335         struct mm_struct *mm = args;
 336
 337         if (!cpu_context(smp_processor_id(), mm))
 338                 return;
 339
 340         r4k_blast_dcache();
 341         r4k_blast_icache();
 342
 343         /*
 344          * Kludge alert.  For obscure reasons R4000SC and R4400SC go nuts if we
 345          * only flush the primary caches but R10000 and R12000 behave sane ...
 346          */
 347         if (current_cpu_data.cputype == CPU_R4000SC ||
 348             current_cpu_data.cputype == CPU_R4000MC ||
 349             current_cpu_data.cputype == CPU_R4400SC ||
 350             current_cpu_data.cputype == CPU_R4400MC)
 351                 r4k_blast_scache();
 352 }
 353
 354 static void r4k_flush_cache_mm(struct mm_struct *mm)
 355 {
 356         if (!cpu_has_dc_aliases)
 357                 return;
 358
 359         on_each_cpu(local_r4k_flush_cache_mm, mm, 1, 1);
 360 }
 361
 362 struct flush_cache_page_args {
 363         struct vm_area_struct *vma;
 364         unsigned long page;
 365 };
 366
 367 static inline void local_r4k_flush_cache_page(void *args)
 368 {
 369         struct flush_cache_page_args *fcp_args = args;
 370         struct vm_area_struct *vma = fcp_args->vma;
 371         unsigned long page = fcp_args->page;
 372         int exec = vma->vm_flags & VM_EXEC;
 373         struct mm_struct *mm = vma->vm_mm;
 374         pgd_t *pgdp;
 375         pmd_t *pmdp;
 376         pte_t *ptep;
 377
 378         page &= PAGE_MASK;
 379         pgdp = pgd_offset(mm, page);
 380         pmdp = pmd_offset(pgdp, page);
 381         ptep = pte_offset(pmdp, page);
 382
 383         /*
 384          * If the page isn't marked valid, the page cannot possibly be
 385          * in the cache.
 386          */
 387         if (!(pte_val(*ptep) & _PAGE_PRESENT))
 388                 return;
 389
 390         /*
 391          * Doing flushes for another ASID than the current one is
 392          * too difficult since stupid R4k caches do a TLB translation
 393          * for every cache flush operation.  So we do indexed flushes
 394          * in that case, which doesn't overly flush the cache too much.
 395          */
 396         if ((mm == current->active_mm) && (pte_val(*ptep) & _PAGE_VALID)) {
 397                 if (cpu_has_dc_aliases || (exec && !cpu_has_ic_fills_f_dc)) {
 398                         r4k_blast_dcache_page(page);
 399                         if (exec && !cpu_icache_snoops_remote_store)
 400                                 r4k_blast_scache_page(page);
 401                 }
 402                 if (exec)
 403                         r4k_blast_icache_page(page);
 404
 405                 return;
 406         }
 407
 408         /*
 409          * Do indexed flush, too much work to get the (possible) TLB refills
 410          * to work correctly.
 411          */
 412         page = INDEX_BASE + (page & (dcache_size - 1));
 413         if (cpu_has_dc_aliases || (exec && !cpu_has_ic_fills_f_dc)) {
 414                 r4k_blast_dcache_page_indexed(page);
 415                 if (exec && !cpu_icache_snoops_remote_store)
 416                         r4k_blast_scache_page_indexed(page);
 417         }
 418         if (exec) {
 419                 if (cpu_has_vtag_icache) {
 420                         int cpu = smp_processor_id();
 421
 422                         if (cpu_context(cpu, vma->vm_mm) != 0)
 423                                 drop_mmu_context(vma->vm_mm, cpu);
 424                 } else
 425                         r4k_blast_icache_page_indexed(page);
 426         }
 427 }
 428
 429 static void r4k_flush_cache_page(struct vm_area_struct *vma, unsigned long page, unsigned long pfn)
 430 {
 431         struct flush_cache_page_args args;
 432
 433         /*
 434          * If ownes no valid ASID yet, cannot possibly have gotten
 435          * this page into the cache.
 436          */
 437         if (cpu_context(smp_processor_id(), vma->vm_mm) == 0)
 438                 return;
 439
 440         args.vma = vma;
 441         args.page = page;
 442
 443         on_each_cpu(local_r4k_flush_cache_page, &args, 1, 1);
 444 }
 445
 446 static inline void local_r4k_flush_data_cache_page(void * addr)
 447 {
 448         r4k_blast_dcache_page((unsigned long) addr);
 449 }
 450
 451 static void r4k_flush_data_cache_page(unsigned long addr)
 452 {
 453         on_each_cpu(local_r4k_flush_data_cache_page, (void *) addr, 1, 1);
 454 }
 455
 456 struct flush_icache_range_args {
 457         unsigned long start;
 458         unsigned long end;
 459 };
 460
 461 static inline void local_r4k_flush_icache_range(void *args)
 462 {
 463         struct flush_icache_range_args *fir_args = args;
 464         unsigned long dc_lsize = current_cpu_data.dcache.linesz;
 465         unsigned long ic_lsize = current_cpu_data.icache.linesz;
 466         unsigned long sc_lsize = current_cpu_data.scache.linesz;
 467         unsigned long start = fir_args->start;
 468         unsigned long end = fir_args->end;
 469         unsigned long addr, aend;
 470
 471         if (!cpu_has_ic_fills_f_dc) {
 472                 if (end - start > dcache_size) {
 473                         r4k_blast_dcache();
 474                 } else {
 475                         addr = start & ~(dc_lsize - 1);
 476                         aend = (end - 1) & ~(dc_lsize - 1);
 477
 478                         while (1) {
 479                                 /* Hit_Writeback_Inv_D */
 480                                 protected_writeback_dcache_line(addr);
 481                                 if (addr == aend)
 482                                         break;
 483                                 addr += dc_lsize;
 484                         }
 485                 }
 486
 487                 if (!cpu_icache_snoops_remote_store) {
 488                         if (end - start > scache_size) {
 489                                 r4k_blast_scache();
 490                         } else {
 491                                 addr = start & ~(sc_lsize - 1);
 492                                 aend = (end - 1) & ~(sc_lsize - 1);
 493
 494                                 while (1) {
 495                                         /* Hit_Writeback_Inv_D */
 496                                         protected_writeback_scache_line(addr);
 497                                         if (addr == aend)
 498                                                 break;
 499                                         addr += sc_lsize;
 500                                 }
 501                         }
 502                 }
 503         }
 504
 505         if (end - start > icache_size)
 506                 r4k_blast_icache();
 507         else {
 508                 addr = start & ~(ic_lsize - 1);
 509                 aend = (end - 1) & ~(ic_lsize - 1);
 510                 while (1) {
 511                         /* Hit_Invalidate_I */
 512                         protected_flush_icache_line(addr);
 513                         if (addr == aend)
 514                                 break;
 515                         addr += ic_lsize;
 516                 }
 517         }
 518 }
 519
 520 static void r4k_flush_icache_range(unsigned long start, unsigned long end)
 521 {
 522         struct flush_icache_range_args args;
 523
 524         args.start = start;
 525         args.end = end;
 526
 527         on_each_cpu(local_r4k_flush_icache_range, &args, 1, 1);
 528 }
 529
 530 /*
 531  * Ok, this seriously sucks.  We use them to flush a user page but don't
 532  * know the virtual address, so we have to blast away the whole icache
 533  * which is significantly more expensive than the real thing.  Otoh we at
 534  * least know the kernel address of the page so we can flush it
 535  * selectivly.
 536  */
 537
 538 struct flush_icache_page_args {
 539         struct vm_area_struct *vma;
 540         struct page *page;
 541 };
 542
 543 static inline void local_r4k_flush_icache_page(void *args)
 544 {
 545         struct flush_icache_page_args *fip_args = args;
 546         struct vm_area_struct *vma = fip_args->vma;
 547         struct page *page = fip_args->page;
 548
 549         /*
 550          * Tricky ...  Because we don't know the virtual address we've got the
 551          * choice of either invalidating the entire primary and secondary
 552          * caches or invalidating the secondary caches also.  With the subset
 553          * enforcment on R4000SC, R4400SC, R10000 and R12000 invalidating the
 554          * secondary cache will result in any entries in the primary caches
 555          * also getting invalidated which hopefully is a bit more economical.
 556          */
 557         if (cpu_has_subset_pcaches) {
 558                 unsigned long addr = (unsigned long) page_address(page);
 559
 560                 r4k_blast_scache_page(addr);
 561                 ClearPageDcacheDirty(page);
 562
 563                 return;
 564         }
 565
 566         if (!cpu_has_ic_fills_f_dc) {
 567                 unsigned long addr = (unsigned long) page_address(page);
 568                 r4k_blast_dcache_page(addr);
 569                 if (!cpu_icache_snoops_remote_store)
 570                         r4k_blast_scache_page(addr);
 571                 ClearPageDcacheDirty(page);
 572         }
 573
 574         /*
 575          * We're not sure of the virtual address(es) involved here, so
 576          * we have to flush the entire I-cache.
 577          */
 578         if (cpu_has_vtag_icache) {
 579                 int cpu = smp_processor_id();
 580
 581                 if (cpu_context(cpu, vma->vm_mm) != 0)
 582                         drop_mmu_context(vma->vm_mm, cpu);
 583         } else
 584                 r4k_blast_icache();
 585 }
 586
 587 static void r4k_flush_icache_page(struct vm_area_struct *vma,
 588         struct page *page)
 589 {
 590         struct flush_icache_page_args args;
 591
 592         /*
 593          * If there's no context yet, or the page isn't executable, no I-cache
 594          * flush is needed.
 595          */
 596         if (!(vma->vm_flags & VM_EXEC))
 597                 return;
 598
 599         args.vma = vma;
 600         args.page = page;
 601
 602         on_each_cpu(local_r4k_flush_icache_page, &args, 1, 1);
 603 }
 604
 605
 606 #ifdef CONFIG_DMA_NONCOHERENT
 607
 608 static void r4k_dma_cache_wback_inv(unsigned long addr, unsigned long size)
 609 {
 610         unsigned long end, a;
 611
 612         /* Catch bad driver code */
 613         BUG_ON(size == 0);
 614
 615         if (cpu_has_subset_pcaches) {
 616                 unsigned long sc_lsize = current_cpu_data.scache.linesz;
 617
 618                 if (size >= scache_size) {
 619                         r4k_blast_scache();
 620                         return;
 621                 }
 622
 623                 a = addr & ~(sc_lsize - 1);
 624                 end = (addr + size - 1) & ~(sc_lsize - 1);
 625                 while (1) {
 626                         flush_scache_line(a);   /* Hit_Writeback_Inv_SD */
 627                         if (a == end)
 628                                 break;
 629                         a += sc_lsize;
 630                 }
 631                 return;
 632         }
 633
 634         /*
 635          * Either no secondary cache or the available caches don't have the
 636          * subset property so we have to flush the primary caches
 637          * explicitly
 638          */
 639         if (size >= dcache_size) {
 640                 r4k_blast_dcache();
 641         } else {
 642                 unsigned long dc_lsize = current_cpu_data.dcache.linesz;
 643
 644                 R4600_HIT_CACHEOP_WAR_IMPL;
 645                 a = addr & ~(dc_lsize - 1);
 646                 end = (addr + size - 1) & ~(dc_lsize - 1);
 647                 while (1) {
 648                         flush_dcache_line(a);   /* Hit_Writeback_Inv_D */
 649                         if (a == end)
 650                                 break;
 651                         a += dc_lsize;
 652                 }
 653         }
 654
 655         bc_wback_inv(addr, size);
 656 }
 657
 658 static void r4k_dma_cache_inv(unsigned long addr, unsigned long size)
 659 {
 660         unsigned long end, a;
 661
 662         /* Catch bad driver code */
 663         BUG_ON(size == 0);
 664
 665         if (cpu_has_subset_pcaches) {
 666                 unsigned long sc_lsize = current_cpu_data.scache.linesz;
 667
 668                 if (size >= scache_size) {
 669                         r4k_blast_scache();
 670                         return;
 671                 }
 672
 673                 a = addr & ~(sc_lsize - 1);
 674                 end = (addr + size - 1) & ~(sc_lsize - 1);
 675                 while (1) {
 676                         flush_scache_line(a);   /* Hit_Writeback_Inv_SD */
 677                         if (a == end)
 678                                 break;
 679                         a += sc_lsize;
 680                 }
 681                 return;
 682         }
 683
 684         if (size >= dcache_size) {
 685                 r4k_blast_dcache();
 686         } else {
 687                 unsigned long dc_lsize = current_cpu_data.dcache.linesz;
 688
 689                 R4600_HIT_CACHEOP_WAR_IMPL;
 690                 a = addr & ~(dc_lsize - 1);
 691                 end = (addr + size - 1) & ~(dc_lsize - 1);
 692                 while (1) {
 693                         flush_dcache_line(a);   /* Hit_Writeback_Inv_D */
 694                         if (a == end)
 695                                 break;
 696                         a += dc_lsize;
 697                 }
 698         }
 699
 700         bc_inv(addr, size);
 701 }
 702 #endif /* CONFIG_DMA_NONCOHERENT */
 703
 704 /*
 705  * While we're protected against bad userland addresses we don't care
 706  * very much about what happens in that case.  Usually a segmentation
 707  * fault will dump the process later on anyway ...
 708  */
 709 static void local_r4k_flush_cache_sigtramp(void * arg)
 710 {
 711         unsigned long ic_lsize = current_cpu_data.icache.linesz;
 712         unsigned long dc_lsize = current_cpu_data.dcache.linesz;
 713         unsigned long sc_lsize = current_cpu_data.scache.linesz;
 714         unsigned long addr = (unsigned long) arg;
 715
 716         R4600_HIT_CACHEOP_WAR_IMPL;
 717         protected_writeback_dcache_line(addr & ~(dc_lsize - 1));
 718         if (!cpu_icache_snoops_remote_store)
 719                 protected_writeback_scache_line(addr & ~(sc_lsize - 1));
 720         protected_flush_icache_line(addr & ~(ic_lsize - 1));
 721         if (MIPS4K_ICACHE_REFILL_WAR) {
 722                 __asm__ __volatile__ (
 723                         ".set push\n\t"
 724                         ".set noat\n\t"
 725                         ".set mips3\n\t"
 726 #ifdef CONFIG_MIPS32
 727                         "la     $at,1f\n\t"
 728 #endif
 729 #ifdef CONFIG_MIPS64
 730                         "dla    $at,1f\n\t"
 731 #endif
 732                         "cache  %0,($at)\n\t"
 733                         "nop; nop; nop\n"
 734                         "1:\n\t"
 735                         ".set pop"
 736                         :
 737                         : "i" (Hit_Invalidate_I));
 738         }
 739         if (MIPS_CACHE_SYNC_WAR)
 740                 __asm__ __volatile__ ("sync");
 741 }
 742
 743 static void r4k_flush_cache_sigtramp(unsigned long addr)
 744 {
 745         on_each_cpu(local_r4k_flush_cache_sigtramp, (void *) addr, 1, 1);
 746 }
 747
 748 static void r4k_flush_icache_all(void)
 749 {
 750         if (cpu_has_vtag_icache)
 751                 r4k_blast_icache();
 752 }
 753
 754 static inline void rm7k_erratum31(void)
 755 {
 756         const unsigned long ic_lsize = 32;
 757         unsigned long addr;
 758
 759         /* RM7000 erratum #31. The icache is screwed at startup. */
 760         write_c0_taglo(0);
 761         write_c0_taghi(0);
 762
 763         for (addr = INDEX_BASE; addr <= INDEX_BASE + 4096; addr += ic_lsize) {
 764                 __asm__ __volatile__ (
 765                         ".set noreorder\n\t"
 766                         ".set mips3\n\t"
 767                         "cache\t%1, 0(%0)\n\t"
 768                         "cache\t%1, 0x1000(%0)\n\t"
 769                         "cache\t%1, 0x2000(%0)\n\t"
 770                         "cache\t%1, 0x3000(%0)\n\t"
 771                         "cache\t%2, 0(%0)\n\t"
 772                         "cache\t%2, 0x1000(%0)\n\t"
 773                         "cache\t%2, 0x2000(%0)\n\t"
 774                         "cache\t%2, 0x3000(%0)\n\t"
 775                         "cache\t%1, 0(%0)\n\t"
 776                         "cache\t%1, 0x1000(%0)\n\t"
 777                         "cache\t%1, 0x2000(%0)\n\t"
 778                         "cache\t%1, 0x3000(%0)\n\t"
 779                         ".set\tmips0\n\t"
 780                         ".set\treorder\n\t"
 781                         :
 782                         : "r" (addr), "i" (Index_Store_Tag_I), "i" (Fill));
 783         }
 784 }
 785
 786 static char *way_string[] __initdata = { NULL, "direct mapped", "2-way",
 787         "3-way", "4-way", "5-way", "6-way", "7-way", "8-way"
 788 };
 789
 790 static void __init probe_pcache(void)
 791 {
 792         struct cpuinfo_mips *c = &current_cpu_data;
 793         unsigned int config = read_c0_config();
 794         unsigned int prid = read_c0_prid();
 795         unsigned long config1;
 796         unsigned int lsize;
 797
 798         switch (c->cputype) {
 799         case CPU_R4600:                 /* QED style two way caches? */
 800         case CPU_R4700:
 801         case CPU_R5000:
 802         case CPU_NEVADA:
 803                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 804                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 805                 c->icache.ways = 2;
 806                 c->icache.waybit = ffs(icache_size/2) - 1;
 807
 808                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
 809                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 810                 c->dcache.ways = 2;
 811                 c->dcache.waybit= ffs(dcache_size/2) - 1;
 812
 813                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 814                 break;
 815
 816         case CPU_R5432:
 817         case CPU_R5500:
 818                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 819                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 820                 c->icache.ways = 2;
 821                 c->icache.waybit= 0;
 822
 823                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
 824                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 825                 c->dcache.ways = 2;
 826                 c->dcache.waybit = 0;
 827
 828                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 829                 break;
 830
 831         case CPU_TX49XX:
 832                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 833                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 834                 c->icache.ways = 4;
 835                 c->icache.waybit= 0;
 836
 837                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
 838                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 839                 c->dcache.ways = 4;
 840                 c->dcache.waybit = 0;
 841
 842                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 843                 break;
 844
 845         case CPU_R4000PC:
 846         case CPU_R4000SC:
 847         case CPU_R4000MC:
 848         case CPU_R4400PC:
 849         case CPU_R4400SC:
 850         case CPU_R4400MC:
 851         case CPU_R4300:
 852                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 853                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 854                 c->icache.ways = 1;
 855                 c->icache.waybit = 0;   /* doesn't matter */
 856
 857                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
 858                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 859                 c->dcache.ways = 1;
 860                 c->dcache.waybit = 0;   /* does not matter */
 861
 862                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 863                 break;
 864
 865         case CPU_R10000:
 866         case CPU_R12000:
 867                 icache_size = 1 << (12 + ((config & R10K_CONF_IC) >> 29));
 868                 c->icache.linesz = 64;
 869                 c->icache.ways = 2;
 870                 c->icache.waybit = 0;
 871
 872                 dcache_size = 1 << (12 + ((config & R10K_CONF_DC) >> 26));
 873                 c->dcache.linesz = 32;
 874                 c->dcache.ways = 2;
 875                 c->dcache.waybit = 0;
 876
 877                 c->options |= MIPS_CPU_PREFETCH;
 878                 break;
 879
 880         case CPU_VR4133:
 881                 write_c0_config(config & ~CONF_EB);
 882         case CPU_VR4131:
 883                 /* Workaround for cache instruction bug of VR4131 */
 884                 if (c->processor_id == 0x0c80U || c->processor_id == 0x0c81U ||
 885                     c->processor_id == 0x0c82U) {
 886                         config &= ~0x00000030U;
 887                         config |= 0x00410000U;
 888                         write_c0_config(config);
 889                 }
 890                 icache_size = 1 << (10 + ((config & CONF_IC) >> 9));
 891                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 892                 c->icache.ways = 2;
 893                 c->icache.waybit = ffs(icache_size/2) - 1;
 894
 895                 dcache_size = 1 << (10 + ((config & CONF_DC) >> 6));
 896                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 897                 c->dcache.ways = 2;
 898                 c->dcache.waybit = ffs(dcache_size/2) - 1;
 899
 900                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 901                 break;
 902
 903         case CPU_VR41XX:
 904         case CPU_VR4111:
 905         case CPU_VR4121:
 906         case CPU_VR4122:
 907         case CPU_VR4181:
 908         case CPU_VR4181A:
 909                 icache_size = 1 << (10 + ((config & CONF_IC) >> 9));
 910                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 911                 c->icache.ways = 1;
 912                 c->icache.waybit = 0;   /* doesn't matter */
 913
 914                 dcache_size = 1 << (10 + ((config & CONF_DC) >> 6));
 915                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 916                 c->dcache.ways = 1;
 917                 c->dcache.waybit = 0;   /* does not matter */
 918
 919                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 920                 break;
 921
 922         case CPU_RM7000:
 923                 rm7k_erratum31();
 924
 925         case CPU_RM9000:
 926                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 927                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 928                 c->icache.ways = 4;
 929                 c->icache.waybit = ffs(icache_size / c->icache.ways) - 1;
 930
 931                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
 932                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 933                 c->dcache.ways = 4;
 934                 c->dcache.waybit = ffs(dcache_size / c->dcache.ways) - 1;
 935
 936 #if !defined(CONFIG_SMP) || !defined(RM9000_CDEX_SMP_WAR)
 937                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 938 #endif
 939                 c->options |= MIPS_CPU_PREFETCH;
 940                 break;
 941
 942         default:
 943                 if (!(config & MIPS_CONF_M))
 944                         panic("Don't know how to probe P-caches on this cpu.");
 945
 946                 /*
 947                  * So we seem to be a MIPS32 or MIPS64 CPU
 948                  * So let's probe the I-cache ...
 949                  */
 950                 config1 = read_c0_config1();
 951
 952                 if ((lsize = ((config1 >> 19) & 7)))
 953                         c->icache.linesz = 2 << lsize;
 954                 else
 955                         c->icache.linesz = lsize;
 956                 c->icache.sets = 64 << ((config1 >> 22) & 7);
 957                 c->icache.ways = 1 + ((config1 >> 16) & 7);
 958
 959                 icache_size = c->icache.sets *
 960                               c->icache.ways *
 961                               c->icache.linesz;
 962                 c->icache.waybit = ffs(icache_size/c->icache.ways) - 1;
 963
 964                 if (config & 0x8)               /* VI bit */
 965                         c->icache.flags |= MIPS_CACHE_VTAG;
 966
 967                 /*
 968                  * Now probe the MIPS32 / MIPS64 data cache.
 969                  */
 970                 c->dcache.flags = 0;
 971
 972                 if ((lsize = ((config1 >> 10) & 7)))
 973                         c->dcache.linesz = 2 << lsize;
 974                 else
 975                         c->dcache.linesz= lsize;
 976                 c->dcache.sets = 64 << ((config1 >> 13) & 7);
 977                 c->dcache.ways = 1 + ((config1 >> 7) & 7);
 978
 979                 dcache_size = c->dcache.sets *
 980                               c->dcache.ways *
 981                               c->dcache.linesz;
 982                 c->dcache.waybit = ffs(dcache_size/c->dcache.ways) - 1;
 983
 984                 c->options |= MIPS_CPU_PREFETCH;
 985                 break;
 986         }
 987
 988         /*
 989          * Processor configuration sanity check for the R4000SC erratum
 990          * #5.  With page sizes larger than 32kB there is no possibility
 991          * to get a VCE exception anymore so we don't care about this
 992          * misconfiguration.  The case is rather theoretical anyway;
 993          * presumably no vendor is shipping his hardware in the "bad"
 994          * configuration.
 995          */
 996         if ((prid & 0xff00) == PRID_IMP_R4000 && (prid & 0xff) < 0x40 &&
 997             !(config & CONF_SC) && c->icache.linesz != 16 &&
 998             PAGE_SIZE <= 0x8000)
 999                 panic("Improper R4000SC processor configuration detected");
1000
1001         /* compute a couple of other cache variables */
1002         c->icache.waysize = icache_size / c->icache.ways;
1003         c->dcache.waysize = dcache_size / c->dcache.ways;
1004
1005         c->icache.sets = icache_size / (c->icache.linesz * c->icache.ways);
1006         c->dcache.sets = dcache_size / (c->dcache.linesz * c->dcache.ways);
1007
1008         /*
1009          * R10000 and R12000 P-caches are odd in a positive way.  They're 32kB
1010          * 2-way virtually indexed so normally would suffer from aliases.  So
1011          * normally they'd suffer from aliases but magic in the hardware deals
1012          * with that for us so we don't need to take care ourselves.
1013          */
1014         if (c->cputype != CPU_R10000 && c->cputype != CPU_R12000)
1015                 if (c->dcache.waysize > PAGE_SIZE)
1016                         c->dcache.flags |= MIPS_CACHE_ALIASES;
1017
1018         switch (c->cputype) {
1019         case CPU_20KC:
1020                 /*
1021                  * Some older 20Kc chips doesn't have the 'VI' bit in
1022                  * the config register.
1023                  */
1024                 c->icache.flags |= MIPS_CACHE_VTAG;
1025                 break;
1026
1027         case CPU_AU1500:
1028                 c->icache.flags |= MIPS_CACHE_IC_F_DC;
1029                 break;
1030         }
1031
1032         printk("Primary instruction cache %ldkB, %s, %s, linesize %d bytes.\n",
1033                icache_size >> 10,
1034                cpu_has_vtag_icache ? "virtually tagged" : "physically tagged",
1035                way_string[c->icache.ways], c->icache.linesz);
1036
1037         printk("Primary data cache %ldkB, %s, linesize %d bytes.\n",
1038                dcache_size >> 10, way_string[c->dcache.ways], c->dcache.linesz);
1039 }
1040
1041 /*
1042  * If you even _breathe_ on this function, look at the gcc output and make sure
1043  * it does not pop things on and off the stack for the cache sizing loop that
1044  * executes in KSEG1 space or else you will crash and burn badly.  You have
1045  * been warned.
1046  */
1047 static int __init probe_scache(void)
1048 {
1049         extern unsigned long stext;
1050         unsigned long flags, addr, begin, end, pow2;
1051         unsigned int config = read_c0_config();
1052         struct cpuinfo_mips *c = &current_cpu_data;
1053         int tmp;
1054
1055         if (config & CONF_SC)
1056                 return 0;
1057
1058         begin = (unsigned long) &stext;
1059         begin &= ~((4 * 1024 * 1024) - 1);
1060         end = begin + (4 * 1024 * 1024);
1061
1062         /*
1063          * This is such a bitch, you'd think they would make it easy to do
1064          * this.  Away you daemons of stupidity!
1065          */
1066         local_irq_save(flags);
1067
1068         /* Fill each size-multiple cache line with a valid tag. */
1069         pow2 = (64 * 1024);
1070         for (addr = begin; addr < end; addr = (begin + pow2)) {
1071                 unsigned long *p = (unsigned long *) addr;
1072                 __asm__ __volatile__("nop" : : "r" (*p)); /* whee... */
1073                 pow2 <<= 1;
1074         }
1075
1076         /* Load first line with zero (therefore invalid) tag. */
1077         write_c0_taglo(0);
1078         write_c0_taghi(0);
1079         __asm__ __volatile__("nop; nop; nop; nop;"); /* avoid the hazard */
1080         cache_op(Index_Store_Tag_I, begin);
1081         cache_op(Index_Store_Tag_D, begin);
1082         cache_op(Index_Store_Tag_SD, begin);
1083
1084         /* Now search for the wrap around point. */
1085         pow2 = (128 * 1024);
1086         tmp = 0;
1087         for (addr = begin + (128 * 1024); addr < end; addr = begin + pow2) {
1088                 cache_op(Index_Load_Tag_SD, addr);
1089                 __asm__ __volatile__("nop; nop; nop; nop;"); /* hazard... */
1090                 if (!read_c0_taglo())
1091                         break;
1092                 pow2 <<= 1;
1093         }
1094         local_irq_restore(flags);
1095         addr -= begin;
1096
1097         scache_size = addr;
1098         c->scache.linesz = 16 << ((config & R4K_CONF_SB) >> 22);
1099         c->scache.ways = 1;
1100         c->dcache.waybit = 0;           /* does not matter */
1101
1102         return 1;
1103 }
1104
1105 typedef int (*probe_func_t)(unsigned long);
1106 extern int r5k_sc_init(void);
1107 extern int rm7k_sc_init(void);
1108
1109 static void __init setup_scache(void)
1110 {
1111         struct cpuinfo_mips *c = &current_cpu_data;
1112         unsigned int config = read_c0_config();
1113         probe_func_t probe_scache_kseg1;
1114         int sc_present = 0;
1115
1116         /*
1117          * Do the probing thing on R4000SC and R4400SC processors.  Other
1118          * processors don't have a S-cache that would be relevant to the
1119          * Linux memory managment.
1120          */
1121         switch (c->cputype) {
1122         case CPU_R4000SC:
1123         case CPU_R4000MC:
1124         case CPU_R4400SC:
1125         case CPU_R4400MC:
1126                 probe_scache_kseg1 = (probe_func_t) (CKSEG1ADDR(&probe_scache));
1127                 sc_present = probe_scache_kseg1(config);
1128                 if (sc_present)
1129                         c->options |= MIPS_CPU_CACHE_CDEX_S;
1130                 break;
1131
1132         case CPU_R10000:
1133         case CPU_R12000:
1134                 scache_size = 0x80000 << ((config & R10K_CONF_SS) >> 16);
1135                 c->scache.linesz = 64 << ((config >> 13) & 1);
1136                 c->scache.ways = 2;
1137                 c->scache.waybit= 0;
1138                 sc_present = 1;
1139                 break;
1140
1141         case CPU_R5000:
1142         case CPU_NEVADA:
1143 #ifdef CONFIG_R5000_CPU_SCACHE
1144                 r5k_sc_init();
1145 #endif
1146                 return;
1147
1148         case CPU_RM7000:
1149         case CPU_RM9000:
1150 #ifdef CONFIG_RM7000_CPU_SCACHE
1151                 rm7k_sc_init();
1152 #endif
1153                 return;
1154
1155         default:
1156                 sc_present = 0;
1157         }
1158
1159         if (!sc_present)
1160                 return;
1161
1162         if ((c->isa_level == MIPS_CPU_ISA_M32 ||
1163              c->isa_level == MIPS_CPU_ISA_M64) &&
1164             !(c->scache.flags & MIPS_CACHE_NOT_PRESENT))
1165                 panic("Dunno how to handle MIPS32 / MIPS64 second level cache");
1166
1167         /* compute a couple of other cache variables */
1168         c->scache.waysize = scache_size / c->scache.ways;
1169
1170         c->scache.sets = scache_size / (c->scache.linesz * c->scache.ways);
1171
1172         printk("Unified secondary cache %ldkB %s, linesize %d bytes.\n",
1173                scache_size >> 10, way_string[c->scache.ways], c->scache.linesz);
1174
1175         c->options |= MIPS_CPU_SUBSET_CACHES;
1176 }
1177
1178 static inline void coherency_setup(void)
1179 {
1180         change_c0_config(CONF_CM_CMASK, CONF_CM_DEFAULT);
1181
1182         /*
1183          * c0_status.cu=0 specifies that updates by the sc instruction use
1184          * the coherency mode specified by the TLB; 1 means cachable
1185          * coherent update on write will be used.  Not all processors have
1186          * this bit and; some wire it to zero, others like Toshiba had the
1187          * silly idea of putting something else there ...
1188          */
1189         switch (current_cpu_data.cputype) {
1190         case CPU_R4000PC:
1191         case CPU_R4000SC:
1192         case CPU_R4000MC:
1193         case CPU_R4400PC:
1194         case CPU_R4400SC:
1195         case CPU_R4400MC:
1196                 clear_c0_config(CONF_CU);
1197                 break;
1198         }
1199 }
1200
1201 void __init ld_mmu_r4xx0(void)
1202 {
1203         extern void build_clear_page(void);
1204         extern void build_copy_page(void);
1205         extern char except_vec2_generic;
1206         struct cpuinfo_mips *c = &current_cpu_data;
1207
1208         /* Default cache error handler for R4000 and R5000 family */
1209         memcpy((void *)(CAC_BASE   + 0x100), &except_vec2_generic, 0x80);
1210         memcpy((void *)(UNCAC_BASE + 0x100), &except_vec2_generic, 0x80);
1211
1212         probe_pcache();
1213         setup_scache();
1214
1215         if (c->dcache.sets * c->dcache.ways > PAGE_SIZE)
1216                 c->dcache.flags |= MIPS_CACHE_ALIASES;
1217
1218         r4k_blast_dcache_page_setup();
1219         r4k_blast_dcache_page_indexed_setup();
1220         r4k_blast_dcache_setup();
1221         r4k_blast_icache_page_setup();
1222         r4k_blast_icache_page_indexed_setup();
1223         r4k_blast_icache_setup();
1224         r4k_blast_scache_page_setup();
1225         r4k_blast_scache_page_indexed_setup();
1226         r4k_blast_scache_setup();
1227
1228         /*
1229          * Some MIPS32 and MIPS64 processors have physically indexed caches.
1230          * This code supports virtually indexed processors and will be
1231          * unnecessarily inefficient on physically indexed processors.
1232          */
1233         shm_align_mask = max_t( unsigned long,
1234                                 c->dcache.sets * c->dcache.linesz - 1,
1235                                 PAGE_SIZE - 1);
1236
1237         flush_cache_all         = r4k_flush_cache_all;
1238         __flush_cache_all       = r4k___flush_cache_all;
1239         flush_cache_mm          = r4k_flush_cache_mm;
1240         flush_cache_page        = r4k_flush_cache_page;
1241         flush_icache_page       = r4k_flush_icache_page;
1242         flush_cache_range       = r4k_flush_cache_range;
1243
1244         flush_cache_sigtramp    = r4k_flush_cache_sigtramp;
1245         flush_icache_all        = r4k_flush_icache_all;
1246         flush_data_cache_page   = r4k_flush_data_cache_page;
1247         flush_icache_range      = r4k_flush_icache_range;
1248
1249 #ifdef CONFIG_DMA_NONCOHERENT
1250         _dma_cache_wback_inv    = r4k_dma_cache_wback_inv;
1251         _dma_cache_wback        = r4k_dma_cache_wback_inv;
1252         _dma_cache_inv          = r4k_dma_cache_inv;
1253 #endif
1254
1255         __flush_cache_all();
1256         coherency_setup();
1257
1258         build_clear_page();
1259         build_copy_page();
1260 }