arch/mips/include/asm/r4kcache.h

   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  * Inline assembly cache operations.
   7  *
   8  * Copyright (C) 1996 David S. Miller (davem@davemloft.net)
   9  * Copyright (C) 1997 - 2002 Ralf Baechle (ralf@gnu.org)
  10  * Copyright (C) 2004 Ralf Baechle (ralf@linux-mips.org)
  11  */
  12 #ifndef _ASM_R4KCACHE_H
  13 #define _ASM_R4KCACHE_H
  14
  15 #include <asm/asm.h>
  16 #include <asm/cacheops.h>
  17 #include <asm/cpu-features.h>
  18 #include <asm/cpu-type.h>
  19 #include <asm/mipsmtregs.h>
  20
  21 /*
  22  * This macro return a properly sign-extended address suitable as base address
  23  * for indexed cache operations.  Two issues here:
  24  *
  25  *  - The MIPS32 and MIPS64 specs permit an implementation to directly derive
  26  *    the index bits from the virtual address.  This breaks with tradition
  27  *    set by the R4000.  To keep unpleasant surprises from happening we pick
  28  *    an address in KSEG0 / CKSEG0.
  29  *  - We need a properly sign extended address for 64-bit code.  To get away
  30  *    without ifdefs we let the compiler do it by a type cast.
  31  */
  32 #define INDEX_BASE      CKSEG0
  33
  34 #define cache_op(op,addr)                                               \
  35         __asm__ __volatile__(                                           \
  36         "       .set    push                                    \n"     \
  37         "       .set    noreorder                               \n"     \
  38         "       .set    mips3\n\t                               \n"     \
  39         "       cache   %0, %1                                  \n"     \
  40         "       .set    pop                                     \n"     \
  41         :                                                               \
  42         : "i" (op), "R" (*(unsigned char *)(addr)))
  43
  44 #ifdef CONFIG_MIPS_MT
  45 /*
  46  * Temporary hacks for SMTC debug. Optionally force single-threaded
  47  * execution during I-cache flushes.
  48  */
  49
  50 #define PROTECT_CACHE_FLUSHES 1
  51
  52 #ifdef PROTECT_CACHE_FLUSHES
  53
  54 extern int mt_protiflush;
  55 extern int mt_protdflush;
  56 extern void mt_cflush_lockdown(void);
  57 extern void mt_cflush_release(void);
  58
  59 #define BEGIN_MT_IPROT \
  60         unsigned long flags = 0;                        \
  61         unsigned long mtflags = 0;                      \
  62         if(mt_protiflush) {                             \
  63                 local_irq_save(flags);                  \
  64                 ehb();                                  \
  65                 mtflags = dvpe();                       \
  66                 mt_cflush_lockdown();                   \
  67         }
  68
  69 #define END_MT_IPROT \
  70         if(mt_protiflush) {                             \
  71                 mt_cflush_release();                    \
  72                 evpe(mtflags);                          \
  73                 local_irq_restore(flags);               \
  74         }
  75
  76 #define BEGIN_MT_DPROT \
  77         unsigned long flags = 0;                        \
  78         unsigned long mtflags = 0;                      \
  79         if(mt_protdflush) {                             \
  80                 local_irq_save(flags);                  \
  81                 ehb();                                  \
  82                 mtflags = dvpe();                       \
  83                 mt_cflush_lockdown();                   \
  84         }
  85
  86 #define END_MT_DPROT \
  87         if(mt_protdflush) {                             \
  88                 mt_cflush_release();                    \
  89                 evpe(mtflags);                          \
  90                 local_irq_restore(flags);               \
  91         }
  92
  93 #else
  94
  95 #define BEGIN_MT_IPROT
  96 #define BEGIN_MT_DPROT
  97 #define END_MT_IPROT
  98 #define END_MT_DPROT
  99
 100 #endif /* PROTECT_CACHE_FLUSHES */
 101
 102 #define __iflush_prologue                                               \
 103         unsigned long redundance;                                       \
 104         extern int mt_n_iflushes;                                       \
 105         BEGIN_MT_IPROT                                                  \
 106         for (redundance = 0; redundance < mt_n_iflushes; redundance++) {
 107
 108 #define __iflush_epilogue                                               \
 109         END_MT_IPROT                                                    \
 110         }
 111
 112 #define __dflush_prologue                                               \
 113         unsigned long redundance;                                       \
 114         extern int mt_n_dflushes;                                       \
 115         BEGIN_MT_DPROT                                                  \
 116         for (redundance = 0; redundance < mt_n_dflushes; redundance++) {
 117
 118 #define __dflush_epilogue \
 119         END_MT_DPROT     \
 120         }
 121
 122 #define __inv_dflush_prologue __dflush_prologue
 123 #define __inv_dflush_epilogue __dflush_epilogue
 124 #define __sflush_prologue {
 125 #define __sflush_epilogue }
 126 #define __inv_sflush_prologue __sflush_prologue
 127 #define __inv_sflush_epilogue __sflush_epilogue
 128
 129 #else /* CONFIG_MIPS_MT */
 130
 131 #define __iflush_prologue {
 132 #define __iflush_epilogue }
 133 #define __dflush_prologue {
 134 #define __dflush_epilogue }
 135 #define __inv_dflush_prologue {
 136 #define __inv_dflush_epilogue }
 137 #define __sflush_prologue {
 138 #define __sflush_epilogue }
 139 #define __inv_sflush_prologue {
 140 #define __inv_sflush_epilogue }
 141
 142 #endif /* CONFIG_MIPS_MT */
 143
 144 static inline void flush_icache_line_indexed(unsigned long addr)
 145 {
 146         __iflush_prologue
 147         cache_op(Index_Invalidate_I, addr);
 148         __iflush_epilogue
 149 }
 150
 151 static inline void flush_dcache_line_indexed(unsigned long addr)
 152 {
 153         __dflush_prologue
 154         cache_op(Index_Writeback_Inv_D, addr);
 155         __dflush_epilogue
 156 }
 157
 158 static inline void flush_scache_line_indexed(unsigned long addr)
 159 {
 160         cache_op(Index_Writeback_Inv_SD, addr);
 161 }
 162
 163 static inline void flush_icache_line(unsigned long addr)
 164 {
 165         __iflush_prologue
 166         switch (boot_cpu_type()) {
 167         case CPU_LOONGSON2:
 168                 cache_op(Hit_Invalidate_I_Loongson2, addr);
 169                 break;
 170
 171         default:
 172                 cache_op(Hit_Invalidate_I, addr);
 173                 break;
 174         }
 175         __iflush_epilogue
 176 }
 177
 178 static inline void flush_dcache_line(unsigned long addr)
 179 {
 180         __dflush_prologue
 181         cache_op(Hit_Writeback_Inv_D, addr);
 182         __dflush_epilogue
 183 }
 184
 185 static inline void invalidate_dcache_line(unsigned long addr)
 186 {
 187         __dflush_prologue
 188         cache_op(Hit_Invalidate_D, addr);
 189         __dflush_epilogue
 190 }
 191
 192 static inline void invalidate_scache_line(unsigned long addr)
 193 {
 194         cache_op(Hit_Invalidate_SD, addr);
 195 }
 196
 197 static inline void flush_scache_line(unsigned long addr)
 198 {
 199         cache_op(Hit_Writeback_Inv_SD, addr);
 200 }
 201
 202 #define protected_cache_op(op,addr)                             \
 203         __asm__ __volatile__(                                   \
 204         "       .set    push                    \n"             \
 205         "       .set    noreorder               \n"             \
 206         "       .set    mips3                   \n"             \
 207         "1:     cache   %0, (%1)                \n"             \
 208         "2:     .set    pop                     \n"             \
 209         "       .section __ex_table,\"a\"       \n"             \
 210         "       "STR(PTR)" 1b, 2b               \n"             \
 211         "       .previous"                                      \
 212         :                                                       \
 213         : "i" (op), "r" (addr))
 214
 215 /*
 216  * The next two are for badland addresses like signal trampolines.
 217  */
 218 static inline void protected_flush_icache_line(unsigned long addr)
 219 {
 220         switch (boot_cpu_type()) {
 221         case CPU_LOONGSON2:
 222                 protected_cache_op(Hit_Invalidate_I_Loongson2, addr);
 223                 break;
 224
 225         default:
 226                 protected_cache_op(Hit_Invalidate_I, addr);
 227                 break;
 228         }
 229 }
 230
 231 /*
 232  * R10000 / R12000 hazard - these processors don't support the Hit_Writeback_D
 233  * cacheop so we use Hit_Writeback_Inv_D which is supported by all R4000-style
 234  * caches.  We're talking about one cacheline unnecessarily getting invalidated
 235  * here so the penalty isn't overly hard.
 236  */
 237 static inline void protected_writeback_dcache_line(unsigned long addr)
 238 {
 239         protected_cache_op(Hit_Writeback_Inv_D, addr);
 240 }
 241
 242 static inline void protected_writeback_scache_line(unsigned long addr)
 243 {
 244         protected_cache_op(Hit_Writeback_Inv_SD, addr);
 245 }
 246
 247 /*
 248  * This one is RM7000-specific
 249  */
 250 static inline void invalidate_tcache_page(unsigned long addr)
 251 {
 252         cache_op(Page_Invalidate_T, addr);
 253 }
 254
 255 #define cache16_unroll32(base,op)                                       \
 256         __asm__ __volatile__(                                           \
 257         "       .set push                                       \n"     \
 258         "       .set noreorder                                  \n"     \
 259         "       .set mips3                                      \n"     \
 260         "       cache %1, 0x000(%0); cache %1, 0x010(%0)        \n"     \
 261         "       cache %1, 0x020(%0); cache %1, 0x030(%0)        \n"     \
 262         "       cache %1, 0x040(%0); cache %1, 0x050(%0)        \n"     \
 263         "       cache %1, 0x060(%0); cache %1, 0x070(%0)        \n"     \
 264         "       cache %1, 0x080(%0); cache %1, 0x090(%0)        \n"     \
 265         "       cache %1, 0x0a0(%0); cache %1, 0x0b0(%0)        \n"     \
 266         "       cache %1, 0x0c0(%0); cache %1, 0x0d0(%0)        \n"     \
 267         "       cache %1, 0x0e0(%0); cache %1, 0x0f0(%0)        \n"     \
 268         "       cache %1, 0x100(%0); cache %1, 0x110(%0)        \n"     \
 269         "       cache %1, 0x120(%0); cache %1, 0x130(%0)        \n"     \
 270         "       cache %1, 0x140(%0); cache %1, 0x150(%0)        \n"     \
 271         "       cache %1, 0x160(%0); cache %1, 0x170(%0)        \n"     \
 272         "       cache %1, 0x180(%0); cache %1, 0x190(%0)        \n"     \
 273         "       cache %1, 0x1a0(%0); cache %1, 0x1b0(%0)        \n"     \
 274         "       cache %1, 0x1c0(%0); cache %1, 0x1d0(%0)        \n"     \
 275         "       cache %1, 0x1e0(%0); cache %1, 0x1f0(%0)        \n"     \
 276         "       .set pop                                        \n"     \
 277                 :                                                       \
 278                 : "r" (base),                                           \
 279                   "i" (op));
 280
 281 #define cache32_unroll32(base,op)                                       \
 282         __asm__ __volatile__(                                           \
 283         "       .set push                                       \n"     \
 284         "       .set noreorder                                  \n"     \
 285         "       .set mips3                                      \n"     \
 286         "       cache %1, 0x000(%0); cache %1, 0x020(%0)        \n"     \
 287         "       cache %1, 0x040(%0); cache %1, 0x060(%0)        \n"     \
 288         "       cache %1, 0x080(%0); cache %1, 0x0a0(%0)        \n"     \
 289         "       cache %1, 0x0c0(%0); cache %1, 0x0e0(%0)        \n"     \
 290         "       cache %1, 0x100(%0); cache %1, 0x120(%0)        \n"     \
 291         "       cache %1, 0x140(%0); cache %1, 0x160(%0)        \n"     \
 292         "       cache %1, 0x180(%0); cache %1, 0x1a0(%0)        \n"     \
 293         "       cache %1, 0x1c0(%0); cache %1, 0x1e0(%0)        \n"     \
 294         "       cache %1, 0x200(%0); cache %1, 0x220(%0)        \n"     \
 295         "       cache %1, 0x240(%0); cache %1, 0x260(%0)        \n"     \
 296         "       cache %1, 0x280(%0); cache %1, 0x2a0(%0)        \n"     \
 297         "       cache %1, 0x2c0(%0); cache %1, 0x2e0(%0)        \n"     \
 298         "       cache %1, 0x300(%0); cache %1, 0x320(%0)        \n"     \
 299         "       cache %1, 0x340(%0); cache %1, 0x360(%0)        \n"     \
 300         "       cache %1, 0x380(%0); cache %1, 0x3a0(%0)        \n"     \
 301         "       cache %1, 0x3c0(%0); cache %1, 0x3e0(%0)        \n"     \
 302         "       .set pop                                        \n"     \
 303                 :                                                       \
 304                 : "r" (base),                                           \
 305                   "i" (op));
 306
 307 #define cache64_unroll32(base,op)                                       \
 308         __asm__ __volatile__(                                           \
 309         "       .set push                                       \n"     \
 310         "       .set noreorder                                  \n"     \
 311         "       .set mips3                                      \n"     \
 312         "       cache %1, 0x000(%0); cache %1, 0x040(%0)        \n"     \
 313         "       cache %1, 0x080(%0); cache %1, 0x0c0(%0)        \n"     \
 314         "       cache %1, 0x100(%0); cache %1, 0x140(%0)        \n"     \
 315         "       cache %1, 0x180(%0); cache %1, 0x1c0(%0)        \n"     \
 316         "       cache %1, 0x200(%0); cache %1, 0x240(%0)        \n"     \
 317         "       cache %1, 0x280(%0); cache %1, 0x2c0(%0)        \n"     \
 318         "       cache %1, 0x300(%0); cache %1, 0x340(%0)        \n"     \
 319         "       cache %1, 0x380(%0); cache %1, 0x3c0(%0)        \n"     \
 320         "       cache %1, 0x400(%0); cache %1, 0x440(%0)        \n"     \
 321         "       cache %1, 0x480(%0); cache %1, 0x4c0(%0)        \n"     \
 322         "       cache %1, 0x500(%0); cache %1, 0x540(%0)        \n"     \
 323         "       cache %1, 0x580(%0); cache %1, 0x5c0(%0)        \n"     \
 324         "       cache %1, 0x600(%0); cache %1, 0x640(%0)        \n"     \
 325         "       cache %1, 0x680(%0); cache %1, 0x6c0(%0)        \n"     \
 326         "       cache %1, 0x700(%0); cache %1, 0x740(%0)        \n"     \
 327         "       cache %1, 0x780(%0); cache %1, 0x7c0(%0)        \n"     \
 328         "       .set pop                                        \n"     \
 329                 :                                                       \
 330                 : "r" (base),                                           \
 331                   "i" (op));
 332
 333 #define cache128_unroll32(base,op)                                      \
 334         __asm__ __volatile__(                                           \
 335         "       .set push                                       \n"     \
 336         "       .set noreorder                                  \n"     \
 337         "       .set mips3                                      \n"     \
 338         "       cache %1, 0x000(%0); cache %1, 0x080(%0)        \n"     \
 339         "       cache %1, 0x100(%0); cache %1, 0x180(%0)        \n"     \
 340         "       cache %1, 0x200(%0); cache %1, 0x280(%0)        \n"     \
 341         "       cache %1, 0x300(%0); cache %1, 0x380(%0)        \n"     \
 342         "       cache %1, 0x400(%0); cache %1, 0x480(%0)        \n"     \
 343         "       cache %1, 0x500(%0); cache %1, 0x580(%0)        \n"     \
 344         "       cache %1, 0x600(%0); cache %1, 0x680(%0)        \n"     \
 345         "       cache %1, 0x700(%0); cache %1, 0x780(%0)        \n"     \
 346         "       cache %1, 0x800(%0); cache %1, 0x880(%0)        \n"     \
 347         "       cache %1, 0x900(%0); cache %1, 0x980(%0)        \n"     \
 348         "       cache %1, 0xa00(%0); cache %1, 0xa80(%0)        \n"     \
 349         "       cache %1, 0xb00(%0); cache %1, 0xb80(%0)        \n"     \
 350         "       cache %1, 0xc00(%0); cache %1, 0xc80(%0)        \n"     \
 351         "       cache %1, 0xd00(%0); cache %1, 0xd80(%0)        \n"     \
 352         "       cache %1, 0xe00(%0); cache %1, 0xe80(%0)        \n"     \
 353         "       cache %1, 0xf00(%0); cache %1, 0xf80(%0)        \n"     \
 354         "       .set pop                                        \n"     \
 355                 :                                                       \
 356                 : "r" (base),                                           \
 357                   "i" (op));
 358
 359 /* build blast_xxx, blast_xxx_page, blast_xxx_page_indexed */
 360 #define __BUILD_BLAST_CACHE(pfx, desc, indexop, hitop, lsize, extra)    \
 361 static inline void extra##blast_##pfx##cache##lsize(void)               \
 362 {                                                                       \
 363         unsigned long start = INDEX_BASE;                               \
 364         unsigned long end = start + current_cpu_data.desc.waysize;      \
 365         unsigned long ws_inc = 1UL << current_cpu_data.desc.waybit;     \
 366         unsigned long ws_end = current_cpu_data.desc.ways <<            \
 367                                current_cpu_data.desc.waybit;            \
 368         unsigned long ws, addr;                                         \
 369                                                                         \
 370         __##pfx##flush_prologue                                         \
 371                                                                         \
 372         for (ws = 0; ws < ws_end; ws += ws_inc)                         \
 373                 for (addr = start; addr < end; addr += lsize * 32)      \
 374                         cache##lsize##_unroll32(addr|ws, indexop);      \
 375                                                                         \
 376         __##pfx##flush_epilogue                                         \
 377 }                                                                       \
 378                                                                         \
 379 static inline void extra##blast_##pfx##cache##lsize##_page(unsigned long page) \
 380 {                                                                       \
 381         unsigned long start = page;                                     \
 382         unsigned long end = page + PAGE_SIZE;                           \
 383                                                                         \
 384         __##pfx##flush_prologue                                         \
 385                                                                         \
 386         do {                                                            \
 387                 cache##lsize##_unroll32(start, hitop);                  \
 388                 start += lsize * 32;                                    \
 389         } while (start < end);                                          \
 390                                                                         \
 391         __##pfx##flush_epilogue                                         \
 392 }                                                                       \
 393                                                                         \
 394 static inline void extra##blast_##pfx##cache##lsize##_page_indexed(unsigned long page) \
 395 {                                                                       \
 396         unsigned long indexmask = current_cpu_data.desc.waysize - 1;    \
 397         unsigned long start = INDEX_BASE + (page & indexmask);          \
 398         unsigned long end = start + PAGE_SIZE;                          \
 399         unsigned long ws_inc = 1UL << current_cpu_data.desc.waybit;     \
 400         unsigned long ws_end = current_cpu_data.desc.ways <<            \
 401                                current_cpu_data.desc.waybit;            \
 402         unsigned long ws, addr;                                         \
 403                                                                         \
 404         __##pfx##flush_prologue                                         \
 405                                                                         \
 406         for (ws = 0; ws < ws_end; ws += ws_inc)                         \
 407                 for (addr = start; addr < end; addr += lsize * 32)      \
 408                         cache##lsize##_unroll32(addr|ws, indexop);      \
 409                                                                         \
 410         __##pfx##flush_epilogue                                         \
 411 }
 412
 413 __BUILD_BLAST_CACHE(d, dcache, Index_Writeback_Inv_D, Hit_Writeback_Inv_D, 16, )
 414 __BUILD_BLAST_CACHE(i, icache, Index_Invalidate_I, Hit_Invalidate_I, 16, )
 415 __BUILD_BLAST_CACHE(s, scache, Index_Writeback_Inv_SD, Hit_Writeback_Inv_SD, 16, )
 416 __BUILD_BLAST_CACHE(d, dcache, Index_Writeback_Inv_D, Hit_Writeback_Inv_D, 32, )
 417 __BUILD_BLAST_CACHE(i, icache, Index_Invalidate_I, Hit_Invalidate_I, 32, )
 418 __BUILD_BLAST_CACHE(i, icache, Index_Invalidate_I, Hit_Invalidate_I_Loongson2, 32, loongson2_)
 419 __BUILD_BLAST_CACHE(s, scache, Index_Writeback_Inv_SD, Hit_Writeback_Inv_SD, 32, )
 420 __BUILD_BLAST_CACHE(d, dcache, Index_Writeback_Inv_D, Hit_Writeback_Inv_D, 64, )
 421 __BUILD_BLAST_CACHE(i, icache, Index_Invalidate_I, Hit_Invalidate_I, 64, )
 422 __BUILD_BLAST_CACHE(s, scache, Index_Writeback_Inv_SD, Hit_Writeback_Inv_SD, 64, )
 423 __BUILD_BLAST_CACHE(s, scache, Index_Writeback_Inv_SD, Hit_Writeback_Inv_SD, 128, )
 424
 425 __BUILD_BLAST_CACHE(inv_d, dcache, Index_Writeback_Inv_D, Hit_Invalidate_D, 16, )
 426 __BUILD_BLAST_CACHE(inv_d, dcache, Index_Writeback_Inv_D, Hit_Invalidate_D, 32, )
 427 __BUILD_BLAST_CACHE(inv_s, scache, Index_Writeback_Inv_SD, Hit_Invalidate_SD, 16, )
 428 __BUILD_BLAST_CACHE(inv_s, scache, Index_Writeback_Inv_SD, Hit_Invalidate_SD, 32, )
 429 __BUILD_BLAST_CACHE(inv_s, scache, Index_Writeback_Inv_SD, Hit_Invalidate_SD, 64, )
 430 __BUILD_BLAST_CACHE(inv_s, scache, Index_Writeback_Inv_SD, Hit_Invalidate_SD, 128, )
 431
 432 /* build blast_xxx_range, protected_blast_xxx_range */
 433 #define __BUILD_BLAST_CACHE_RANGE(pfx, desc, hitop, prot, extra)        \
 434 static inline void prot##extra##blast_##pfx##cache##_range(unsigned long start, \
 435                                                     unsigned long end)  \
 436 {                                                                       \
 437         unsigned long lsize = cpu_##desc##_line_size();                 \
 438         unsigned long addr = start & ~(lsize - 1);                      \
 439         unsigned long aend = (end - 1) & ~(lsize - 1);                  \
 440                                                                         \
 441         __##pfx##flush_prologue                                         \
 442                                                                         \
 443         while (1) {                                                     \
 444                 prot##cache_op(hitop, addr);                            \
 445                 if (addr == aend)                                       \
 446                         break;                                          \
 447                 addr += lsize;                                          \
 448         }                                                               \
 449                                                                         \
 450         __##pfx##flush_epilogue                                         \
 451 }
 452
 453 __BUILD_BLAST_CACHE_RANGE(d, dcache, Hit_Writeback_Inv_D, protected_, )
 454 __BUILD_BLAST_CACHE_RANGE(s, scache, Hit_Writeback_Inv_SD, protected_, )
 455 __BUILD_BLAST_CACHE_RANGE(i, icache, Hit_Invalidate_I, protected_, )
 456 __BUILD_BLAST_CACHE_RANGE(i, icache, Hit_Invalidate_I_Loongson2, \
 457         protected_, loongson2_)
 458 __BUILD_BLAST_CACHE_RANGE(d, dcache, Hit_Writeback_Inv_D, , )
 459 __BUILD_BLAST_CACHE_RANGE(s, scache, Hit_Writeback_Inv_SD, , )
 460 /* blast_inv_dcache_range */
 461 __BUILD_BLAST_CACHE_RANGE(inv_d, dcache, Hit_Invalidate_D, , )
 462 __BUILD_BLAST_CACHE_RANGE(inv_s, scache, Hit_Invalidate_SD, , )
 463
 464 #endif /* _ASM_R4KCACHE_H */