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/init.h>
  11 #include <linux/kernel.h>
  12 #include <linux/sched.h>
  13 #include <linux/mm.h>
  14 #include <linux/bitops.h>
  15
  16 #include <asm/bcache.h>
  17 #include <asm/bootinfo.h>
  18 #include <asm/cache.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 #include <asm/cacheflush.h> /* for run_uncached() */
  30
  31
  32 /*
  33  * Special Variant of smp_call_function for use by cache functions:
  34  *
  35  *  o No return value
  36  *  o collapses to normal function call on UP kernels
  37  *  o collapses to normal function call on systems with a single shared
  38  *    primary cache.
  39  */
  40 static inline void r4k_on_each_cpu(void (*func) (void *info), void *info,
  41                                    int retry, int wait)
  42 {
  43         preempt_disable();
  44
  45 #if !defined(CONFIG_MIPS_MT_SMP) && !defined(CONFIG_MIPS_MT_SMTC)
  46         smp_call_function(func, info, retry, wait);
  47 #endif
  48         func(info);
  49         preempt_enable();
  50 }
  51
  52 /*
  53  * Must die.
  54  */
  55 static unsigned long icache_size __read_mostly;
  56 static unsigned long dcache_size __read_mostly;
  57 static unsigned long scache_size __read_mostly;
  58
  59 /*
  60  * Dummy cache handling routines for machines without boardcaches
  61  */
  62 static void cache_noop(void) {}
  63
  64 static struct bcache_ops no_sc_ops = {
  65         .bc_enable = (void *)cache_noop,
  66         .bc_disable = (void *)cache_noop,
  67         .bc_wback_inv = (void *)cache_noop,
  68         .bc_inv = (void *)cache_noop
  69 };
  70
  71 struct bcache_ops *bcops = &no_sc_ops;
  72
  73 #define cpu_is_r4600_v1_x()     ((read_c0_prid() & 0xfffffff0) == 0x00002010)
  74 #define cpu_is_r4600_v2_x()     ((read_c0_prid() & 0xfffffff0) == 0x00002020)
  75
  76 #define R4600_HIT_CACHEOP_WAR_IMPL                                      \
  77 do {                                                                    \
  78         if (R4600_V2_HIT_CACHEOP_WAR && cpu_is_r4600_v2_x())            \
  79                 *(volatile unsigned long *)CKSEG1;                      \
  80         if (R4600_V1_HIT_CACHEOP_WAR)                                   \
  81                 __asm__ __volatile__("nop;nop;nop;nop");                \
  82 } while (0)
  83
  84 static void (*r4k_blast_dcache_page)(unsigned long addr);
  85
  86 static inline void r4k_blast_dcache_page_dc32(unsigned long addr)
  87 {
  88         R4600_HIT_CACHEOP_WAR_IMPL;
  89         blast_dcache32_page(addr);
  90 }
  91
  92 static void __init r4k_blast_dcache_page_setup(void)
  93 {
  94         unsigned long  dc_lsize = cpu_dcache_line_size();
  95
  96         if (dc_lsize == 0)
  97                 r4k_blast_dcache_page = (void *)cache_noop;
  98         else if (dc_lsize == 16)
  99                 r4k_blast_dcache_page = blast_dcache16_page;
 100         else if (dc_lsize == 32)
 101                 r4k_blast_dcache_page = r4k_blast_dcache_page_dc32;
 102 }
 103
 104 static void (* r4k_blast_dcache_page_indexed)(unsigned long addr);
 105
 106 static void __init r4k_blast_dcache_page_indexed_setup(void)
 107 {
 108         unsigned long dc_lsize = cpu_dcache_line_size();
 109
 110         if (dc_lsize == 0)
 111                 r4k_blast_dcache_page_indexed = (void *)cache_noop;
 112         else if (dc_lsize == 16)
 113                 r4k_blast_dcache_page_indexed = blast_dcache16_page_indexed;
 114         else if (dc_lsize == 32)
 115                 r4k_blast_dcache_page_indexed = blast_dcache32_page_indexed;
 116 }
 117
 118 static void (* r4k_blast_dcache)(void);
 119
 120 static void __init r4k_blast_dcache_setup(void)
 121 {
 122         unsigned long dc_lsize = cpu_dcache_line_size();
 123
 124         if (dc_lsize == 0)
 125                 r4k_blast_dcache = (void *)cache_noop;
 126         else if (dc_lsize == 16)
 127                 r4k_blast_dcache = blast_dcache16;
 128         else if (dc_lsize == 32)
 129                 r4k_blast_dcache = blast_dcache32;
 130 }
 131
 132 /* force code alignment (used for TX49XX_ICACHE_INDEX_INV_WAR) */
 133 #define JUMP_TO_ALIGN(order) \
 134         __asm__ __volatile__( \
 135                 "b\t1f\n\t" \
 136                 ".align\t" #order "\n\t" \
 137                 "1:\n\t" \
 138                 )
 139 #define CACHE32_UNROLL32_ALIGN  JUMP_TO_ALIGN(10) /* 32 * 32 = 1024 */
 140 #define CACHE32_UNROLL32_ALIGN2 JUMP_TO_ALIGN(11)
 141
 142 static inline void blast_r4600_v1_icache32(void)
 143 {
 144         unsigned long flags;
 145
 146         local_irq_save(flags);
 147         blast_icache32();
 148         local_irq_restore(flags);
 149 }
 150
 151 static inline void tx49_blast_icache32(void)
 152 {
 153         unsigned long start = INDEX_BASE;
 154         unsigned long end = start + current_cpu_data.icache.waysize;
 155         unsigned long ws_inc = 1UL << current_cpu_data.icache.waybit;
 156         unsigned long ws_end = current_cpu_data.icache.ways <<
 157                                current_cpu_data.icache.waybit;
 158         unsigned long ws, addr;
 159
 160         CACHE32_UNROLL32_ALIGN2;
 161         /* I'm in even chunk.  blast odd chunks */
 162         for (ws = 0; ws < ws_end; ws += ws_inc)
 163                 for (addr = start + 0x400; addr < end; addr += 0x400 * 2)
 164                         cache32_unroll32(addr|ws,Index_Invalidate_I);
 165         CACHE32_UNROLL32_ALIGN;
 166         /* I'm in odd chunk.  blast even chunks */
 167         for (ws = 0; ws < ws_end; ws += ws_inc)
 168                 for (addr = start; addr < end; addr += 0x400 * 2)
 169                         cache32_unroll32(addr|ws,Index_Invalidate_I);
 170 }
 171
 172 static inline void blast_icache32_r4600_v1_page_indexed(unsigned long page)
 173 {
 174         unsigned long flags;
 175
 176         local_irq_save(flags);
 177         blast_icache32_page_indexed(page);
 178         local_irq_restore(flags);
 179 }
 180
 181 static inline void tx49_blast_icache32_page_indexed(unsigned long page)
 182 {
 183         unsigned long indexmask = current_cpu_data.icache.waysize - 1;
 184         unsigned long start = INDEX_BASE + (page & indexmask);
 185         unsigned long end = start + PAGE_SIZE;
 186         unsigned long ws_inc = 1UL << current_cpu_data.icache.waybit;
 187         unsigned long ws_end = current_cpu_data.icache.ways <<
 188                                current_cpu_data.icache.waybit;
 189         unsigned long ws, addr;
 190
 191         CACHE32_UNROLL32_ALIGN2;
 192         /* I'm in even chunk.  blast odd chunks */
 193         for (ws = 0; ws < ws_end; ws += ws_inc)
 194                 for (addr = start + 0x400; addr < end; addr += 0x400 * 2)
 195                         cache32_unroll32(addr|ws,Index_Invalidate_I);
 196         CACHE32_UNROLL32_ALIGN;
 197         /* I'm in odd chunk.  blast even chunks */
 198         for (ws = 0; ws < ws_end; ws += ws_inc)
 199                 for (addr = start; addr < end; addr += 0x400 * 2)
 200                         cache32_unroll32(addr|ws,Index_Invalidate_I);
 201 }
 202
 203 static void (* r4k_blast_icache_page)(unsigned long addr);
 204
 205 static void __init r4k_blast_icache_page_setup(void)
 206 {
 207         unsigned long ic_lsize = cpu_icache_line_size();
 208
 209         if (ic_lsize == 0)
 210                 r4k_blast_icache_page = (void *)cache_noop;
 211         else if (ic_lsize == 16)
 212                 r4k_blast_icache_page = blast_icache16_page;
 213         else if (ic_lsize == 32)
 214                 r4k_blast_icache_page = blast_icache32_page;
 215         else if (ic_lsize == 64)
 216                 r4k_blast_icache_page = blast_icache64_page;
 217 }
 218
 219
 220 static void (* r4k_blast_icache_page_indexed)(unsigned long addr);
 221
 222 static void __init r4k_blast_icache_page_indexed_setup(void)
 223 {
 224         unsigned long ic_lsize = cpu_icache_line_size();
 225
 226         if (ic_lsize == 0)
 227                 r4k_blast_icache_page_indexed = (void *)cache_noop;
 228         else if (ic_lsize == 16)
 229                 r4k_blast_icache_page_indexed = blast_icache16_page_indexed;
 230         else if (ic_lsize == 32) {
 231                 if (R4600_V1_INDEX_ICACHEOP_WAR && cpu_is_r4600_v1_x())
 232                         r4k_blast_icache_page_indexed =
 233                                 blast_icache32_r4600_v1_page_indexed;
 234                 else if (TX49XX_ICACHE_INDEX_INV_WAR)
 235                         r4k_blast_icache_page_indexed =
 236                                 tx49_blast_icache32_page_indexed;
 237                 else
 238                         r4k_blast_icache_page_indexed =
 239                                 blast_icache32_page_indexed;
 240         } else if (ic_lsize == 64)
 241                 r4k_blast_icache_page_indexed = blast_icache64_page_indexed;
 242 }
 243
 244 static void (* r4k_blast_icache)(void);
 245
 246 static void __init r4k_blast_icache_setup(void)
 247 {
 248         unsigned long ic_lsize = cpu_icache_line_size();
 249
 250         if (ic_lsize == 0)
 251                 r4k_blast_icache = (void *)cache_noop;
 252         else if (ic_lsize == 16)
 253                 r4k_blast_icache = blast_icache16;
 254         else if (ic_lsize == 32) {
 255                 if (R4600_V1_INDEX_ICACHEOP_WAR && cpu_is_r4600_v1_x())
 256                         r4k_blast_icache = blast_r4600_v1_icache32;
 257                 else if (TX49XX_ICACHE_INDEX_INV_WAR)
 258                         r4k_blast_icache = tx49_blast_icache32;
 259                 else
 260                         r4k_blast_icache = blast_icache32;
 261         } else if (ic_lsize == 64)
 262                 r4k_blast_icache = blast_icache64;
 263 }
 264
 265 static void (* r4k_blast_scache_page)(unsigned long addr);
 266
 267 static void __init r4k_blast_scache_page_setup(void)
 268 {
 269         unsigned long sc_lsize = cpu_scache_line_size();
 270
 271         if (scache_size == 0)
 272                 r4k_blast_scache_page = (void *)cache_noop;
 273         else if (sc_lsize == 16)
 274                 r4k_blast_scache_page = blast_scache16_page;
 275         else if (sc_lsize == 32)
 276                 r4k_blast_scache_page = blast_scache32_page;
 277         else if (sc_lsize == 64)
 278                 r4k_blast_scache_page = blast_scache64_page;
 279         else if (sc_lsize == 128)
 280                 r4k_blast_scache_page = blast_scache128_page;
 281 }
 282
 283 static void (* r4k_blast_scache_page_indexed)(unsigned long addr);
 284
 285 static void __init r4k_blast_scache_page_indexed_setup(void)
 286 {
 287         unsigned long sc_lsize = cpu_scache_line_size();
 288
 289         if (scache_size == 0)
 290                 r4k_blast_scache_page_indexed = (void *)cache_noop;
 291         else if (sc_lsize == 16)
 292                 r4k_blast_scache_page_indexed = blast_scache16_page_indexed;
 293         else if (sc_lsize == 32)
 294                 r4k_blast_scache_page_indexed = blast_scache32_page_indexed;
 295         else if (sc_lsize == 64)
 296                 r4k_blast_scache_page_indexed = blast_scache64_page_indexed;
 297         else if (sc_lsize == 128)
 298                 r4k_blast_scache_page_indexed = blast_scache128_page_indexed;
 299 }
 300
 301 static void (* r4k_blast_scache)(void);
 302
 303 static void __init r4k_blast_scache_setup(void)
 304 {
 305         unsigned long sc_lsize = cpu_scache_line_size();
 306
 307         if (scache_size == 0)
 308                 r4k_blast_scache = (void *)cache_noop;
 309         else if (sc_lsize == 16)
 310                 r4k_blast_scache = blast_scache16;
 311         else if (sc_lsize == 32)
 312                 r4k_blast_scache = blast_scache32;
 313         else if (sc_lsize == 64)
 314                 r4k_blast_scache = blast_scache64;
 315         else if (sc_lsize == 128)
 316                 r4k_blast_scache = blast_scache128;
 317 }
 318
 319 /*
 320  * This is former mm's flush_cache_all() which really should be
 321  * flush_cache_vunmap these days ...
 322  */
 323 static inline void local_r4k_flush_cache_all(void * args)
 324 {
 325         r4k_blast_dcache();
 326         r4k_blast_icache();
 327 }
 328
 329 static void r4k_flush_cache_all(void)
 330 {
 331         if (!cpu_has_dc_aliases)
 332                 return;
 333
 334         r4k_on_each_cpu(local_r4k_flush_cache_all, NULL, 1, 1);
 335 }
 336
 337 static inline void local_r4k___flush_cache_all(void * args)
 338 {
 339         r4k_blast_dcache();
 340         r4k_blast_icache();
 341
 342         switch (current_cpu_data.cputype) {
 343         case CPU_R4000SC:
 344         case CPU_R4000MC:
 345         case CPU_R4400SC:
 346         case CPU_R4400MC:
 347         case CPU_R10000:
 348         case CPU_R12000:
 349         case CPU_R14000:
 350                 r4k_blast_scache();
 351         }
 352 }
 353
 354 static void r4k___flush_cache_all(void)
 355 {
 356         r4k_on_each_cpu(local_r4k___flush_cache_all, NULL, 1, 1);
 357 }
 358
 359 static inline void local_r4k_flush_cache_range(void * args)
 360 {
 361         struct vm_area_struct *vma = args;
 362         int exec;
 363
 364         if (!(cpu_context(smp_processor_id(), vma->vm_mm)))
 365                 return;
 366
 367         exec = vma->vm_flags & VM_EXEC;
 368         if (cpu_has_dc_aliases || exec)
 369                 r4k_blast_dcache();
 370         if (exec)
 371                 r4k_blast_icache();
 372 }
 373
 374 static void r4k_flush_cache_range(struct vm_area_struct *vma,
 375         unsigned long start, unsigned long end)
 376 {
 377         r4k_on_each_cpu(local_r4k_flush_cache_range, vma, 1, 1);
 378 }
 379
 380 static inline void local_r4k_flush_cache_mm(void * args)
 381 {
 382         struct mm_struct *mm = args;
 383
 384         if (!cpu_context(smp_processor_id(), mm))
 385                 return;
 386
 387         r4k_blast_dcache();
 388         r4k_blast_icache();
 389
 390         /*
 391          * Kludge alert.  For obscure reasons R4000SC and R4400SC go nuts if we
 392          * only flush the primary caches but R10000 and R12000 behave sane ...
 393          */
 394         if (current_cpu_data.cputype == CPU_R4000SC ||
 395             current_cpu_data.cputype == CPU_R4000MC ||
 396             current_cpu_data.cputype == CPU_R4400SC ||
 397             current_cpu_data.cputype == CPU_R4400MC)
 398                 r4k_blast_scache();
 399 }
 400
 401 static void r4k_flush_cache_mm(struct mm_struct *mm)
 402 {
 403         if (!cpu_has_dc_aliases)
 404                 return;
 405
 406         r4k_on_each_cpu(local_r4k_flush_cache_mm, mm, 1, 1);
 407 }
 408
 409 struct flush_cache_page_args {
 410         struct vm_area_struct *vma;
 411         unsigned long addr;
 412         unsigned long pfn;
 413 };
 414
 415 static inline void local_r4k_flush_cache_page(void *args)
 416 {
 417         struct flush_cache_page_args *fcp_args = args;
 418         struct vm_area_struct *vma = fcp_args->vma;
 419         unsigned long addr = fcp_args->addr;
 420         unsigned long paddr = fcp_args->pfn << PAGE_SHIFT;
 421         int exec = vma->vm_flags & VM_EXEC;
 422         struct mm_struct *mm = vma->vm_mm;
 423         pgd_t *pgdp;
 424         pud_t *pudp;
 425         pmd_t *pmdp;
 426         pte_t *ptep;
 427
 428         /*
 429          * If ownes no valid ASID yet, cannot possibly have gotten
 430          * this page into the cache.
 431          */
 432         if (cpu_context(smp_processor_id(), mm) == 0)
 433                 return;
 434
 435         addr &= PAGE_MASK;
 436         pgdp = pgd_offset(mm, addr);
 437         pudp = pud_offset(pgdp, addr);
 438         pmdp = pmd_offset(pudp, addr);
 439         ptep = pte_offset(pmdp, addr);
 440
 441         /*
 442          * If the page isn't marked valid, the page cannot possibly be
 443          * in the cache.
 444          */
 445         if (!(pte_val(*ptep) & _PAGE_PRESENT))
 446                 return;
 447
 448         /*
 449          * Doing flushes for another ASID than the current one is
 450          * too difficult since stupid R4k caches do a TLB translation
 451          * for every cache flush operation.  So we do indexed flushes
 452          * in that case, which doesn't overly flush the cache too much.
 453          */
 454         if ((mm == current->active_mm) && (pte_val(*ptep) & _PAGE_VALID)) {
 455                 if (cpu_has_dc_aliases || (exec && !cpu_has_ic_fills_f_dc)) {
 456                         r4k_blast_dcache_page(addr);
 457                         if (exec && !cpu_icache_snoops_remote_store)
 458                                 r4k_blast_scache_page(addr);
 459                 }
 460                 if (exec)
 461                         r4k_blast_icache_page(addr);
 462
 463                 return;
 464         }
 465
 466         /*
 467          * Do indexed flush, too much work to get the (possible) TLB refills
 468          * to work correctly.
 469          */
 470         if (cpu_has_dc_aliases || (exec && !cpu_has_ic_fills_f_dc)) {
 471                 r4k_blast_dcache_page_indexed(cpu_has_pindexed_dcache ?
 472                                               paddr : addr);
 473                 if (exec && !cpu_icache_snoops_remote_store) {
 474                         r4k_blast_scache_page_indexed(paddr);
 475                 }
 476         }
 477         if (exec) {
 478                 if (cpu_has_vtag_icache && mm == current->active_mm) {
 479                         int cpu = smp_processor_id();
 480
 481                         if (cpu_context(cpu, mm) != 0)
 482                                 drop_mmu_context(mm, cpu);
 483                 } else
 484                         r4k_blast_icache_page_indexed(addr);
 485         }
 486 }
 487
 488 static void r4k_flush_cache_page(struct vm_area_struct *vma,
 489         unsigned long addr, unsigned long pfn)
 490 {
 491         struct flush_cache_page_args args;
 492
 493         args.vma = vma;
 494         args.addr = addr;
 495         args.pfn = pfn;
 496
 497         r4k_on_each_cpu(local_r4k_flush_cache_page, &args, 1, 1);
 498 }
 499
 500 static inline void local_r4k_flush_data_cache_page(void * addr)
 501 {
 502         r4k_blast_dcache_page((unsigned long) addr);
 503 }
 504
 505 static void r4k_flush_data_cache_page(unsigned long addr)
 506 {
 507         r4k_on_each_cpu(local_r4k_flush_data_cache_page, (void *) addr, 1, 1);
 508 }
 509
 510 struct flush_icache_range_args {
 511         unsigned long start;
 512         unsigned long end;
 513 };
 514
 515 static inline void local_r4k_flush_icache_range(void *args)
 516 {
 517         struct flush_icache_range_args *fir_args = args;
 518         unsigned long start = fir_args->start;
 519         unsigned long end = fir_args->end;
 520
 521         if (!cpu_has_ic_fills_f_dc) {
 522                 if (end - start >= dcache_size) {
 523                         r4k_blast_dcache();
 524                 } else {
 525                         R4600_HIT_CACHEOP_WAR_IMPL;
 526                         protected_blast_dcache_range(start, end);
 527                 }
 528
 529                 if (!cpu_icache_snoops_remote_store && scache_size) {
 530                         if (end - start > scache_size)
 531                                 r4k_blast_scache();
 532                         else
 533                                 protected_blast_scache_range(start, end);
 534                 }
 535         }
 536
 537         if (end - start > icache_size)
 538                 r4k_blast_icache();
 539         else
 540                 protected_blast_icache_range(start, end);
 541 }
 542
 543 static void r4k_flush_icache_range(unsigned long start, unsigned long end)
 544 {
 545         struct flush_icache_range_args args;
 546
 547         args.start = start;
 548         args.end = end;
 549
 550         r4k_on_each_cpu(local_r4k_flush_icache_range, &args, 1, 1);
 551         instruction_hazard();
 552 }
 553
 554 #ifdef CONFIG_DMA_NONCOHERENT
 555
 556 static void r4k_dma_cache_wback_inv(unsigned long addr, unsigned long size)
 557 {
 558         /* Catch bad driver code */
 559         BUG_ON(size == 0);
 560
 561         if (cpu_has_inclusive_pcaches) {
 562                 if (size >= scache_size)
 563                         r4k_blast_scache();
 564                 else
 565                         blast_scache_range(addr, addr + size);
 566                 return;
 567         }
 568
 569         /*
 570          * Either no secondary cache or the available caches don't have the
 571          * subset property so we have to flush the primary caches
 572          * explicitly
 573          */
 574         if (size >= dcache_size) {
 575                 r4k_blast_dcache();
 576         } else {
 577                 R4600_HIT_CACHEOP_WAR_IMPL;
 578                 blast_dcache_range(addr, addr + size);
 579         }
 580
 581         bc_wback_inv(addr, size);
 582 }
 583
 584 static void r4k_dma_cache_inv(unsigned long addr, unsigned long size)
 585 {
 586         /* Catch bad driver code */
 587         BUG_ON(size == 0);
 588
 589         if (cpu_has_inclusive_pcaches) {
 590                 if (size >= scache_size)
 591                         r4k_blast_scache();
 592                 else
 593                         blast_scache_range(addr, addr + size);
 594                 return;
 595         }
 596
 597         if (size >= dcache_size) {
 598                 r4k_blast_dcache();
 599         } else {
 600                 R4600_HIT_CACHEOP_WAR_IMPL;
 601                 blast_dcache_range(addr, addr + size);
 602         }
 603
 604         bc_inv(addr, size);
 605 }
 606 #endif /* CONFIG_DMA_NONCOHERENT */
 607
 608 /*
 609  * While we're protected against bad userland addresses we don't care
 610  * very much about what happens in that case.  Usually a segmentation
 611  * fault will dump the process later on anyway ...
 612  */
 613 static void local_r4k_flush_cache_sigtramp(void * arg)
 614 {
 615         unsigned long ic_lsize = cpu_icache_line_size();
 616         unsigned long dc_lsize = cpu_dcache_line_size();
 617         unsigned long sc_lsize = cpu_scache_line_size();
 618         unsigned long addr = (unsigned long) arg;
 619
 620         R4600_HIT_CACHEOP_WAR_IMPL;
 621         if (dc_lsize)
 622                 protected_writeback_dcache_line(addr & ~(dc_lsize - 1));
 623         if (!cpu_icache_snoops_remote_store && scache_size)
 624                 protected_writeback_scache_line(addr & ~(sc_lsize - 1));
 625         if (ic_lsize)
 626                 protected_flush_icache_line(addr & ~(ic_lsize - 1));
 627         if (MIPS4K_ICACHE_REFILL_WAR) {
 628                 __asm__ __volatile__ (
 629                         ".set push\n\t"
 630                         ".set noat\n\t"
 631                         ".set mips3\n\t"
 632 #ifdef CONFIG_32BIT
 633                         "la     $at,1f\n\t"
 634 #endif
 635 #ifdef CONFIG_64BIT
 636                         "dla    $at,1f\n\t"
 637 #endif
 638                         "cache  %0,($at)\n\t"
 639                         "nop; nop; nop\n"
 640                         "1:\n\t"
 641                         ".set pop"
 642                         :
 643                         : "i" (Hit_Invalidate_I));
 644         }
 645         if (MIPS_CACHE_SYNC_WAR)
 646                 __asm__ __volatile__ ("sync");
 647 }
 648
 649 static void r4k_flush_cache_sigtramp(unsigned long addr)
 650 {
 651         r4k_on_each_cpu(local_r4k_flush_cache_sigtramp, (void *) addr, 1, 1);
 652 }
 653
 654 static void r4k_flush_icache_all(void)
 655 {
 656         if (cpu_has_vtag_icache)
 657                 r4k_blast_icache();
 658 }
 659
 660 static inline void rm7k_erratum31(void)
 661 {
 662         const unsigned long ic_lsize = 32;
 663         unsigned long addr;
 664
 665         /* RM7000 erratum #31. The icache is screwed at startup. */
 666         write_c0_taglo(0);
 667         write_c0_taghi(0);
 668
 669         for (addr = INDEX_BASE; addr <= INDEX_BASE + 4096; addr += ic_lsize) {
 670                 __asm__ __volatile__ (
 671                         ".set push\n\t"
 672                         ".set noreorder\n\t"
 673                         ".set mips3\n\t"
 674                         "cache\t%1, 0(%0)\n\t"
 675                         "cache\t%1, 0x1000(%0)\n\t"
 676                         "cache\t%1, 0x2000(%0)\n\t"
 677                         "cache\t%1, 0x3000(%0)\n\t"
 678                         "cache\t%2, 0(%0)\n\t"
 679                         "cache\t%2, 0x1000(%0)\n\t"
 680                         "cache\t%2, 0x2000(%0)\n\t"
 681                         "cache\t%2, 0x3000(%0)\n\t"
 682                         "cache\t%1, 0(%0)\n\t"
 683                         "cache\t%1, 0x1000(%0)\n\t"
 684                         "cache\t%1, 0x2000(%0)\n\t"
 685                         "cache\t%1, 0x3000(%0)\n\t"
 686                         ".set pop\n"
 687                         :
 688                         : "r" (addr), "i" (Index_Store_Tag_I), "i" (Fill));
 689         }
 690 }
 691
 692 static char *way_string[] __initdata = { NULL, "direct mapped", "2-way",
 693         "3-way", "4-way", "5-way", "6-way", "7-way", "8-way"
 694 };
 695
 696 static void __init probe_pcache(void)
 697 {
 698         struct cpuinfo_mips *c = &current_cpu_data;
 699         unsigned int config = read_c0_config();
 700         unsigned int prid = read_c0_prid();
 701         unsigned long config1;
 702         unsigned int lsize;
 703
 704         switch (c->cputype) {
 705         case CPU_R4600:                 /* QED style two way caches? */
 706         case CPU_R4700:
 707         case CPU_R5000:
 708         case CPU_NEVADA:
 709                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 710                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 711                 c->icache.ways = 2;
 712                 c->icache.waybit = __ffs(icache_size/2);
 713
 714                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
 715                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 716                 c->dcache.ways = 2;
 717                 c->dcache.waybit= __ffs(dcache_size/2);
 718
 719                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 720                 break;
 721
 722         case CPU_R5432:
 723         case CPU_R5500:
 724                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 725                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 726                 c->icache.ways = 2;
 727                 c->icache.waybit= 0;
 728
 729                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
 730                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 731                 c->dcache.ways = 2;
 732                 c->dcache.waybit = 0;
 733
 734                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 735                 break;
 736
 737         case CPU_TX49XX:
 738                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 739                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 740                 c->icache.ways = 4;
 741                 c->icache.waybit= 0;
 742
 743                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
 744                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 745                 c->dcache.ways = 4;
 746                 c->dcache.waybit = 0;
 747
 748                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 749                 c->options |= MIPS_CPU_PREFETCH;
 750                 break;
 751
 752         case CPU_R4000PC:
 753         case CPU_R4000SC:
 754         case CPU_R4000MC:
 755         case CPU_R4400PC:
 756         case CPU_R4400SC:
 757         case CPU_R4400MC:
 758         case CPU_R4300:
 759                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 760                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 761                 c->icache.ways = 1;
 762                 c->icache.waybit = 0;   /* doesn't matter */
 763
 764                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
 765                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 766                 c->dcache.ways = 1;
 767                 c->dcache.waybit = 0;   /* does not matter */
 768
 769                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 770                 break;
 771
 772         case CPU_R10000:
 773         case CPU_R12000:
 774         case CPU_R14000:
 775                 icache_size = 1 << (12 + ((config & R10K_CONF_IC) >> 29));
 776                 c->icache.linesz = 64;
 777                 c->icache.ways = 2;
 778                 c->icache.waybit = 0;
 779
 780                 dcache_size = 1 << (12 + ((config & R10K_CONF_DC) >> 26));
 781                 c->dcache.linesz = 32;
 782                 c->dcache.ways = 2;
 783                 c->dcache.waybit = 0;
 784
 785                 c->options |= MIPS_CPU_PREFETCH;
 786                 break;
 787
 788         case CPU_VR4133:
 789                 write_c0_config(config & ~VR41_CONF_P4K);
 790         case CPU_VR4131:
 791                 /* Workaround for cache instruction bug of VR4131 */
 792                 if (c->processor_id == 0x0c80U || c->processor_id == 0x0c81U ||
 793                     c->processor_id == 0x0c82U) {
 794                         config |= 0x00400000U;
 795                         if (c->processor_id == 0x0c80U)
 796                                 config |= VR41_CONF_BP;
 797                         write_c0_config(config);
 798                 } else
 799                         c->options |= MIPS_CPU_CACHE_CDEX_P;
 800
 801                 icache_size = 1 << (10 + ((config & CONF_IC) >> 9));
 802                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 803                 c->icache.ways = 2;
 804                 c->icache.waybit = __ffs(icache_size/2);
 805
 806                 dcache_size = 1 << (10 + ((config & CONF_DC) >> 6));
 807                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 808                 c->dcache.ways = 2;
 809                 c->dcache.waybit = __ffs(dcache_size/2);
 810                 break;
 811
 812         case CPU_VR41XX:
 813         case CPU_VR4111:
 814         case CPU_VR4121:
 815         case CPU_VR4122:
 816         case CPU_VR4181:
 817         case CPU_VR4181A:
 818                 icache_size = 1 << (10 + ((config & CONF_IC) >> 9));
 819                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 820                 c->icache.ways = 1;
 821                 c->icache.waybit = 0;   /* doesn't matter */
 822
 823                 dcache_size = 1 << (10 + ((config & CONF_DC) >> 6));
 824                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 825                 c->dcache.ways = 1;
 826                 c->dcache.waybit = 0;   /* does not matter */
 827
 828                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 829                 break;
 830
 831         case CPU_RM7000:
 832                 rm7k_erratum31();
 833
 834         case CPU_RM9000:
 835                 icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 836                 c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 837                 c->icache.ways = 4;
 838                 c->icache.waybit = __ffs(icache_size / c->icache.ways);
 839
 840                 dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
 841                 c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
 842                 c->dcache.ways = 4;
 843                 c->dcache.waybit = __ffs(dcache_size / c->dcache.ways);
 844
 845 #if !defined(CONFIG_SMP) || !defined(RM9000_CDEX_SMP_WAR)
 846                 c->options |= MIPS_CPU_CACHE_CDEX_P;
 847 #endif
 848                 c->options |= MIPS_CPU_PREFETCH;
 849                 break;
 850
 851         default:
 852                 if (!(config & MIPS_CONF_M))
 853                         panic("Don't know how to probe P-caches on this cpu.");
 854
 855                 /*
 856                  * So we seem to be a MIPS32 or MIPS64 CPU
 857                  * So let's probe the I-cache ...
 858                  */
 859                 config1 = read_c0_config1();
 860
 861                 if ((lsize = ((config1 >> 19) & 7)))
 862                         c->icache.linesz = 2 << lsize;
 863                 else
 864                         c->icache.linesz = lsize;
 865                 c->icache.sets = 64 << ((config1 >> 22) & 7);
 866                 c->icache.ways = 1 + ((config1 >> 16) & 7);
 867
 868                 icache_size = c->icache.sets *
 869                               c->icache.ways *
 870                               c->icache.linesz;
 871                 c->icache.waybit = __ffs(icache_size/c->icache.ways);
 872
 873                 if (config & 0x8)               /* VI bit */
 874                         c->icache.flags |= MIPS_CACHE_VTAG;
 875
 876                 /*
 877                  * Now probe the MIPS32 / MIPS64 data cache.
 878                  */
 879                 c->dcache.flags = 0;
 880
 881                 if ((lsize = ((config1 >> 10) & 7)))
 882                         c->dcache.linesz = 2 << lsize;
 883                 else
 884                         c->dcache.linesz= lsize;
 885                 c->dcache.sets = 64 << ((config1 >> 13) & 7);
 886                 c->dcache.ways = 1 + ((config1 >> 7) & 7);
 887
 888                 dcache_size = c->dcache.sets *
 889                               c->dcache.ways *
 890                               c->dcache.linesz;
 891                 c->dcache.waybit = __ffs(dcache_size/c->dcache.ways);
 892
 893                 c->options |= MIPS_CPU_PREFETCH;
 894                 break;
 895         }
 896
 897         /*
 898          * Processor configuration sanity check for the R4000SC erratum
 899          * #5.  With page sizes larger than 32kB there is no possibility
 900          * to get a VCE exception anymore so we don't care about this
 901          * misconfiguration.  The case is rather theoretical anyway;
 902          * presumably no vendor is shipping his hardware in the "bad"
 903          * configuration.
 904          */
 905         if ((prid & 0xff00) == PRID_IMP_R4000 && (prid & 0xff) < 0x40 &&
 906             !(config & CONF_SC) && c->icache.linesz != 16 &&
 907             PAGE_SIZE <= 0x8000)
 908                 panic("Improper R4000SC processor configuration detected");
 909
 910         /* compute a couple of other cache variables */
 911         c->icache.waysize = icache_size / c->icache.ways;
 912         c->dcache.waysize = dcache_size / c->dcache.ways;
 913
 914         c->icache.sets = c->icache.linesz ?
 915                 icache_size / (c->icache.linesz * c->icache.ways) : 0;
 916         c->dcache.sets = c->dcache.linesz ?
 917                 dcache_size / (c->dcache.linesz * c->dcache.ways) : 0;
 918
 919         /*
 920          * R10000 and R12000 P-caches are odd in a positive way.  They're 32kB
 921          * 2-way virtually indexed so normally would suffer from aliases.  So
 922          * normally they'd suffer from aliases but magic in the hardware deals
 923          * with that for us so we don't need to take care ourselves.
 924          */
 925         switch (c->cputype) {
 926         case CPU_20KC:
 927         case CPU_25KF:
 928                 c->dcache.flags |= MIPS_CACHE_PINDEX;
 929         case CPU_R10000:
 930         case CPU_R12000:
 931         case CPU_R14000:
 932         case CPU_SB1:
 933                 break;
 934         case CPU_24K:
 935         case CPU_34K:
 936         case CPU_74K:
 937                 if ((read_c0_config7() & (1 << 16))) {
 938                         /* effectively physically indexed dcache,
 939                            thus no virtual aliases. */
 940                         c->dcache.flags |= MIPS_CACHE_PINDEX;
 941                         break;
 942                 }
 943         default:
 944                 if (c->dcache.waysize > PAGE_SIZE)
 945                         c->dcache.flags |= MIPS_CACHE_ALIASES;
 946         }
 947
 948         switch (c->cputype) {
 949         case CPU_20KC:
 950                 /*
 951                  * Some older 20Kc chips doesn't have the 'VI' bit in
 952                  * the config register.
 953                  */
 954                 c->icache.flags |= MIPS_CACHE_VTAG;
 955                 break;
 956
 957         case CPU_AU1000:
 958         case CPU_AU1500:
 959         case CPU_AU1100:
 960         case CPU_AU1550:
 961         case CPU_AU1200:
 962                 c->icache.flags |= MIPS_CACHE_IC_F_DC;
 963                 break;
 964         }
 965
 966         printk("Primary instruction cache %ldkB, %s, %s, linesize %d bytes.\n",
 967                icache_size >> 10,
 968                cpu_has_vtag_icache ? "virtually tagged" : "physically tagged",
 969                way_string[c->icache.ways], c->icache.linesz);
 970
 971         printk("Primary data cache %ldkB, %s, linesize %d bytes.\n",
 972                dcache_size >> 10, way_string[c->dcache.ways], c->dcache.linesz);
 973 }
 974
 975 /*
 976  * If you even _breathe_ on this function, look at the gcc output and make sure
 977  * it does not pop things on and off the stack for the cache sizing loop that
 978  * executes in KSEG1 space or else you will crash and burn badly.  You have
 979  * been warned.
 980  */
 981 static int __init probe_scache(void)
 982 {
 983         extern unsigned long stext;
 984         unsigned long flags, addr, begin, end, pow2;
 985         unsigned int config = read_c0_config();
 986         struct cpuinfo_mips *c = &current_cpu_data;
 987         int tmp;
 988
 989         if (config & CONF_SC)
 990                 return 0;
 991
 992         begin = (unsigned long) &stext;
 993         begin &= ~((4 * 1024 * 1024) - 1);
 994         end = begin + (4 * 1024 * 1024);
 995
 996         /*
 997          * This is such a bitch, you'd think they would make it easy to do
 998          * this.  Away you daemons of stupidity!
 999          */
1000         local_irq_save(flags);
1001
1002         /* Fill each size-multiple cache line with a valid tag. */
1003         pow2 = (64 * 1024);
1004         for (addr = begin; addr < end; addr = (begin + pow2)) {
1005                 unsigned long *p = (unsigned long *) addr;
1006                 __asm__ __volatile__("nop" : : "r" (*p)); /* whee... */
1007                 pow2 <<= 1;
1008         }
1009
1010         /* Load first line with zero (therefore invalid) tag. */
1011         write_c0_taglo(0);
1012         write_c0_taghi(0);
1013         __asm__ __volatile__("nop; nop; nop; nop;"); /* avoid the hazard */
1014         cache_op(Index_Store_Tag_I, begin);
1015         cache_op(Index_Store_Tag_D, begin);
1016         cache_op(Index_Store_Tag_SD, begin);
1017
1018         /* Now search for the wrap around point. */
1019         pow2 = (128 * 1024);
1020         tmp = 0;
1021         for (addr = begin + (128 * 1024); addr < end; addr = begin + pow2) {
1022                 cache_op(Index_Load_Tag_SD, addr);
1023                 __asm__ __volatile__("nop; nop; nop; nop;"); /* hazard... */
1024                 if (!read_c0_taglo())
1025                         break;
1026                 pow2 <<= 1;
1027         }
1028         local_irq_restore(flags);
1029         addr -= begin;
1030
1031         scache_size = addr;
1032         c->scache.linesz = 16 << ((config & R4K_CONF_SB) >> 22);
1033         c->scache.ways = 1;
1034         c->dcache.waybit = 0;           /* does not matter */
1035
1036         return 1;
1037 }
1038
1039 extern int r5k_sc_init(void);
1040 extern int rm7k_sc_init(void);
1041 extern int mips_sc_init(void);
1042
1043 static void __init setup_scache(void)
1044 {
1045         struct cpuinfo_mips *c = &current_cpu_data;
1046         unsigned int config = read_c0_config();
1047         int sc_present = 0;
1048
1049         /*
1050          * Do the probing thing on R4000SC and R4400SC processors.  Other
1051          * processors don't have a S-cache that would be relevant to the
1052          * Linux memory managment.
1053          */
1054         switch (c->cputype) {
1055         case CPU_R4000SC:
1056         case CPU_R4000MC:
1057         case CPU_R4400SC:
1058         case CPU_R4400MC:
1059                 sc_present = run_uncached(probe_scache);
1060                 if (sc_present)
1061                         c->options |= MIPS_CPU_CACHE_CDEX_S;
1062                 break;
1063
1064         case CPU_R10000:
1065         case CPU_R12000:
1066         case CPU_R14000:
1067                 scache_size = 0x80000 << ((config & R10K_CONF_SS) >> 16);
1068                 c->scache.linesz = 64 << ((config >> 13) & 1);
1069                 c->scache.ways = 2;
1070                 c->scache.waybit= 0;
1071                 sc_present = 1;
1072                 break;
1073
1074         case CPU_R5000:
1075         case CPU_NEVADA:
1076 #ifdef CONFIG_R5000_CPU_SCACHE
1077                 r5k_sc_init();
1078 #endif
1079                 return;
1080
1081         case CPU_RM7000:
1082         case CPU_RM9000:
1083 #ifdef CONFIG_RM7000_CPU_SCACHE
1084                 rm7k_sc_init();
1085 #endif
1086                 return;
1087
1088         default:
1089                 if (c->isa_level == MIPS_CPU_ISA_M32R1 ||
1090                     c->isa_level == MIPS_CPU_ISA_M32R2 ||
1091                     c->isa_level == MIPS_CPU_ISA_M64R1 ||
1092                     c->isa_level == MIPS_CPU_ISA_M64R2) {
1093 #ifdef CONFIG_MIPS_CPU_SCACHE
1094                         if (mips_sc_init ()) {
1095                                 scache_size = c->scache.ways * c->scache.sets * c->scache.linesz;
1096                                 printk("MIPS secondary cache %ldkB, %s, linesize %d bytes.\n",
1097                                        scache_size >> 10,
1098                                        way_string[c->scache.ways], c->scache.linesz);
1099                         }
1100 #else
1101                         if (!(c->scache.flags & MIPS_CACHE_NOT_PRESENT))
1102                                 panic("Dunno how to handle MIPS32 / MIPS64 second level cache");
1103 #endif
1104                         return;
1105                 }
1106                 sc_present = 0;
1107         }
1108
1109         if (!sc_present)
1110                 return;
1111
1112         /* compute a couple of other cache variables */
1113         c->scache.waysize = scache_size / c->scache.ways;
1114
1115         c->scache.sets = scache_size / (c->scache.linesz * c->scache.ways);
1116
1117         printk("Unified secondary cache %ldkB %s, linesize %d bytes.\n",
1118                scache_size >> 10, way_string[c->scache.ways], c->scache.linesz);
1119
1120         c->options |= MIPS_CPU_INCLUSIVE_CACHES;
1121 }
1122
1123 void au1x00_fixup_config_od(void)
1124 {
1125         /*
1126          * c0_config.od (bit 19) was write only (and read as 0)
1127          * on the early revisions of Alchemy SOCs.  It disables the bus
1128          * transaction overlapping and needs to be set to fix various errata.
1129          */
1130         switch (read_c0_prid()) {
1131         case 0x00030100: /* Au1000 DA */
1132         case 0x00030201: /* Au1000 HA */
1133         case 0x00030202: /* Au1000 HB */
1134         case 0x01030200: /* Au1500 AB */
1135         /*
1136          * Au1100 errata actually keeps silence about this bit, so we set it
1137          * just in case for those revisions that require it to be set according
1138          * to arch/mips/au1000/common/cputable.c
1139          */
1140         case 0x02030200: /* Au1100 AB */
1141         case 0x02030201: /* Au1100 BA */
1142         case 0x02030202: /* Au1100 BC */
1143                 set_c0_config(1 << 19);
1144                 break;
1145         }
1146 }
1147
1148 static void __init coherency_setup(void)
1149 {
1150         change_c0_config(CONF_CM_CMASK, CONF_CM_DEFAULT);
1151
1152         /*
1153          * c0_status.cu=0 specifies that updates by the sc instruction use
1154          * the coherency mode specified by the TLB; 1 means cachable
1155          * coherent update on write will be used.  Not all processors have
1156          * this bit and; some wire it to zero, others like Toshiba had the
1157          * silly idea of putting something else there ...
1158          */
1159         switch (current_cpu_data.cputype) {
1160         case CPU_R4000PC:
1161         case CPU_R4000SC:
1162         case CPU_R4000MC:
1163         case CPU_R4400PC:
1164         case CPU_R4400SC:
1165         case CPU_R4400MC:
1166                 clear_c0_config(CONF_CU);
1167                 break;
1168         /*
1169          * We need to catch the early Alchemy SOCs with
1170          * the write-only co_config.od bit and set it back to one...
1171          */
1172         case CPU_AU1000: /* rev. DA, HA, HB */
1173         case CPU_AU1100: /* rev. AB, BA, BC ?? */
1174         case CPU_AU1500: /* rev. AB */
1175                 au1x00_fixup_config_od();
1176                 break;
1177         }
1178 }
1179
1180 void __init r4k_cache_init(void)
1181 {
1182         extern void build_clear_page(void);
1183         extern void build_copy_page(void);
1184         extern char except_vec2_generic;
1185         struct cpuinfo_mips *c = &current_cpu_data;
1186
1187         /* Default cache error handler for R4000 and R5000 family */
1188         set_uncached_handler (0x100, &except_vec2_generic, 0x80);
1189
1190         probe_pcache();
1191         setup_scache();
1192
1193         r4k_blast_dcache_page_setup();
1194         r4k_blast_dcache_page_indexed_setup();
1195         r4k_blast_dcache_setup();
1196         r4k_blast_icache_page_setup();
1197         r4k_blast_icache_page_indexed_setup();
1198         r4k_blast_icache_setup();
1199         r4k_blast_scache_page_setup();
1200         r4k_blast_scache_page_indexed_setup();
1201         r4k_blast_scache_setup();
1202
1203         /*
1204          * Some MIPS32 and MIPS64 processors have physically indexed caches.
1205          * This code supports virtually indexed processors and will be
1206          * unnecessarily inefficient on physically indexed processors.
1207          */
1208         if (c->dcache.linesz)
1209                 shm_align_mask = max_t( unsigned long,
1210                                         c->dcache.sets * c->dcache.linesz - 1,
1211                                         PAGE_SIZE - 1);
1212         else
1213                 shm_align_mask = PAGE_SIZE-1;
1214         flush_cache_all         = r4k_flush_cache_all;
1215         __flush_cache_all       = r4k___flush_cache_all;
1216         flush_cache_mm          = r4k_flush_cache_mm;
1217         flush_cache_page        = r4k_flush_cache_page;
1218         flush_cache_range       = r4k_flush_cache_range;
1219
1220         flush_cache_sigtramp    = r4k_flush_cache_sigtramp;
1221         flush_icache_all        = r4k_flush_icache_all;
1222         local_flush_data_cache_page     = local_r4k_flush_data_cache_page;
1223         flush_data_cache_page   = r4k_flush_data_cache_page;
1224         flush_icache_range      = r4k_flush_icache_range;
1225
1226 #ifdef CONFIG_DMA_NONCOHERENT
1227         _dma_cache_wback_inv    = r4k_dma_cache_wback_inv;
1228         _dma_cache_wback        = r4k_dma_cache_wback_inv;
1229         _dma_cache_inv          = r4k_dma_cache_inv;
1230 #endif
1231
1232         build_clear_page();
1233         build_copy_page();
1234         local_r4k___flush_cache_all(NULL);
1235         coherency_setup();
1236 }