arch/x86/include/asm/xor.h

   1 #ifdef CONFIG_KMEMCHECK
   2 /* kmemcheck doesn't handle MMX/SSE/SSE2 instructions */
   3 # include <asm-generic/xor.h>
   4 #elif !defined(_ASM_X86_XOR_H)
   5 #define _ASM_X86_XOR_H
   6
   7 /*
   8  * Optimized RAID-5 checksumming functions for SSE.
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2, or (at your option)
  13  * any later version.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * (for example /usr/src/linux/COPYING); if not, write to the Free
  17  * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18  */
  19
  20 /*
  21  * Cache avoiding checksumming functions utilizing KNI instructions
  22  * Copyright (C) 1999 Zach Brown (with obvious credit due Ingo)
  23  */
  24
  25 /*
  26  * Based on
  27  * High-speed RAID5 checksumming functions utilizing SSE instructions.
  28  * Copyright (C) 1998 Ingo Molnar.
  29  */
  30
  31 /*
  32  * x86-64 changes / gcc fixes from Andi Kleen.
  33  * Copyright 2002 Andi Kleen, SuSE Labs.
  34  *
  35  * This hasn't been optimized for the hammer yet, but there are likely
  36  * no advantages to be gotten from x86-64 here anyways.
  37  */
  38
  39 #include <asm/fpu/api.h>
  40
  41 #ifdef CONFIG_X86_32
  42 /* reduce register pressure */
  43 # define XOR_CONSTANT_CONSTRAINT "i"
  44 #else
  45 # define XOR_CONSTANT_CONSTRAINT "re"
  46 #endif
  47
  48 #define OFFS(x)         "16*("#x")"
  49 #define PF_OFFS(x)      "256+16*("#x")"
  50 #define PF0(x)          "       prefetchnta "PF_OFFS(x)"(%[p1])         ;\n"
  51 #define LD(x, y)        "       movaps "OFFS(x)"(%[p1]), %%xmm"#y"      ;\n"
  52 #define ST(x, y)        "       movaps %%xmm"#y", "OFFS(x)"(%[p1])      ;\n"
  53 #define PF1(x)          "       prefetchnta "PF_OFFS(x)"(%[p2])         ;\n"
  54 #define PF2(x)          "       prefetchnta "PF_OFFS(x)"(%[p3])         ;\n"
  55 #define PF3(x)          "       prefetchnta "PF_OFFS(x)"(%[p4])         ;\n"
  56 #define PF4(x)          "       prefetchnta "PF_OFFS(x)"(%[p5])         ;\n"
  57 #define XO1(x, y)       "       xorps "OFFS(x)"(%[p2]), %%xmm"#y"       ;\n"
  58 #define XO2(x, y)       "       xorps "OFFS(x)"(%[p3]), %%xmm"#y"       ;\n"
  59 #define XO3(x, y)       "       xorps "OFFS(x)"(%[p4]), %%xmm"#y"       ;\n"
  60 #define XO4(x, y)       "       xorps "OFFS(x)"(%[p5]), %%xmm"#y"       ;\n"
  61 #define NOP(x)
  62
  63 #define BLK64(pf, op, i)                                \
  64                 pf(i)                                   \
  65                 op(i, 0)                                \
  66                         op(i + 1, 1)                    \
  67                                 op(i + 2, 2)            \
  68                                         op(i + 3, 3)
  69
  70 static void
  71 xor_sse_2(unsigned long bytes, unsigned long *p1, unsigned long *p2)
  72 {
  73         unsigned long lines = bytes >> 8;
  74
  75         kernel_fpu_begin();
  76
  77         asm volatile(
  78 #undef BLOCK
  79 #define BLOCK(i)                                        \
  80                 LD(i, 0)                                \
  81                         LD(i + 1, 1)                    \
  82                 PF1(i)                                  \
  83                                 PF1(i + 2)              \
  84                                 LD(i + 2, 2)            \
  85                                         LD(i + 3, 3)    \
  86                 PF0(i + 4)                              \
  87                                 PF0(i + 6)              \
  88                 XO1(i, 0)                               \
  89                         XO1(i + 1, 1)                   \
  90                                 XO1(i + 2, 2)           \
  91                                         XO1(i + 3, 3)   \
  92                 ST(i, 0)                                \
  93                         ST(i + 1, 1)                    \
  94                                 ST(i + 2, 2)            \
  95                                         ST(i + 3, 3)    \
  96
  97
  98                 PF0(0)
  99                                 PF0(2)
 100
 101         " .align 32                     ;\n"
 102         " 1:                            ;\n"
 103
 104                 BLOCK(0)
 105                 BLOCK(4)
 106                 BLOCK(8)
 107                 BLOCK(12)
 108
 109         "       add %[inc], %[p1]       ;\n"
 110         "       add %[inc], %[p2]       ;\n"
 111         "       dec %[cnt]              ;\n"
 112         "       jnz 1b                  ;\n"
 113         : [cnt] "+r" (lines),
 114           [p1] "+r" (p1), [p2] "+r" (p2)
 115         : [inc] XOR_CONSTANT_CONSTRAINT (256UL)
 116         : "memory");
 117
 118         kernel_fpu_end();
 119 }
 120
 121 static void
 122 xor_sse_2_pf64(unsigned long bytes, unsigned long *p1, unsigned long *p2)
 123 {
 124         unsigned long lines = bytes >> 8;
 125
 126         kernel_fpu_begin();
 127
 128         asm volatile(
 129 #undef BLOCK
 130 #define BLOCK(i)                        \
 131                 BLK64(PF0, LD, i)       \
 132                 BLK64(PF1, XO1, i)      \
 133                 BLK64(NOP, ST, i)       \
 134
 135         " .align 32                     ;\n"
 136         " 1:                            ;\n"
 137
 138                 BLOCK(0)
 139                 BLOCK(4)
 140                 BLOCK(8)
 141                 BLOCK(12)
 142
 143         "       add %[inc], %[p1]       ;\n"
 144         "       add %[inc], %[p2]       ;\n"
 145         "       dec %[cnt]              ;\n"
 146         "       jnz 1b                  ;\n"
 147         : [cnt] "+r" (lines),
 148           [p1] "+r" (p1), [p2] "+r" (p2)
 149         : [inc] XOR_CONSTANT_CONSTRAINT (256UL)
 150         : "memory");
 151
 152         kernel_fpu_end();
 153 }
 154
 155 static void
 156 xor_sse_3(unsigned long bytes, unsigned long *p1, unsigned long *p2,
 157           unsigned long *p3)
 158 {
 159         unsigned long lines = bytes >> 8;
 160
 161         kernel_fpu_begin();
 162
 163         asm volatile(
 164 #undef BLOCK
 165 #define BLOCK(i) \
 166                 PF1(i)                                  \
 167                                 PF1(i + 2)              \
 168                 LD(i, 0)                                \
 169                         LD(i + 1, 1)                    \
 170                                 LD(i + 2, 2)            \
 171                                         LD(i + 3, 3)    \
 172                 PF2(i)                                  \
 173                                 PF2(i + 2)              \
 174                 PF0(i + 4)                              \
 175                                 PF0(i + 6)              \
 176                 XO1(i, 0)                               \
 177                         XO1(i + 1, 1)                   \
 178                                 XO1(i + 2, 2)           \
 179                                         XO1(i + 3, 3)   \
 180                 XO2(i, 0)                               \
 181                         XO2(i + 1, 1)                   \
 182                                 XO2(i + 2, 2)           \
 183                                         XO2(i + 3, 3)   \
 184                 ST(i, 0)                                \
 185                         ST(i + 1, 1)                    \
 186                                 ST(i + 2, 2)            \
 187                                         ST(i + 3, 3)    \
 188
 189
 190                 PF0(0)
 191                                 PF0(2)
 192
 193         " .align 32                     ;\n"
 194         " 1:                            ;\n"
 195
 196                 BLOCK(0)
 197                 BLOCK(4)
 198                 BLOCK(8)
 199                 BLOCK(12)
 200
 201         "       add %[inc], %[p1]       ;\n"
 202         "       add %[inc], %[p2]       ;\n"
 203         "       add %[inc], %[p3]       ;\n"
 204         "       dec %[cnt]              ;\n"
 205         "       jnz 1b                  ;\n"
 206         : [cnt] "+r" (lines),
 207           [p1] "+r" (p1), [p2] "+r" (p2), [p3] "+r" (p3)
 208         : [inc] XOR_CONSTANT_CONSTRAINT (256UL)
 209         : "memory");
 210
 211         kernel_fpu_end();
 212 }
 213
 214 static void
 215 xor_sse_3_pf64(unsigned long bytes, unsigned long *p1, unsigned long *p2,
 216                unsigned long *p3)
 217 {
 218         unsigned long lines = bytes >> 8;
 219
 220         kernel_fpu_begin();
 221
 222         asm volatile(
 223 #undef BLOCK
 224 #define BLOCK(i)                        \
 225                 BLK64(PF0, LD, i)       \
 226                 BLK64(PF1, XO1, i)      \
 227                 BLK64(PF2, XO2, i)      \
 228                 BLK64(NOP, ST, i)       \
 229
 230         " .align 32                     ;\n"
 231         " 1:                            ;\n"
 232
 233                 BLOCK(0)
 234                 BLOCK(4)
 235                 BLOCK(8)
 236                 BLOCK(12)
 237
 238         "       add %[inc], %[p1]       ;\n"
 239         "       add %[inc], %[p2]       ;\n"
 240         "       add %[inc], %[p3]       ;\n"
 241         "       dec %[cnt]              ;\n"
 242         "       jnz 1b                  ;\n"
 243         : [cnt] "+r" (lines),
 244           [p1] "+r" (p1), [p2] "+r" (p2), [p3] "+r" (p3)
 245         : [inc] XOR_CONSTANT_CONSTRAINT (256UL)
 246         : "memory");
 247
 248         kernel_fpu_end();
 249 }
 250
 251 static void
 252 xor_sse_4(unsigned long bytes, unsigned long *p1, unsigned long *p2,
 253           unsigned long *p3, unsigned long *p4)
 254 {
 255         unsigned long lines = bytes >> 8;
 256
 257         kernel_fpu_begin();
 258
 259         asm volatile(
 260 #undef BLOCK
 261 #define BLOCK(i) \
 262                 PF1(i)                                  \
 263                                 PF1(i + 2)              \
 264                 LD(i, 0)                                \
 265                         LD(i + 1, 1)                    \
 266                                 LD(i + 2, 2)            \
 267                                         LD(i + 3, 3)    \
 268                 PF2(i)                                  \
 269                                 PF2(i + 2)              \
 270                 XO1(i, 0)                               \
 271                         XO1(i + 1, 1)                   \
 272                                 XO1(i + 2, 2)           \
 273                                         XO1(i + 3, 3)   \
 274                 PF3(i)                                  \
 275                                 PF3(i + 2)              \
 276                 PF0(i + 4)                              \
 277                                 PF0(i + 6)              \
 278                 XO2(i, 0)                               \
 279                         XO2(i + 1, 1)                   \
 280                                 XO2(i + 2, 2)           \
 281                                         XO2(i + 3, 3)   \
 282                 XO3(i, 0)                               \
 283                         XO3(i + 1, 1)                   \
 284                                 XO3(i + 2, 2)           \
 285                                         XO3(i + 3, 3)   \
 286                 ST(i, 0)                                \
 287                         ST(i + 1, 1)                    \
 288                                 ST(i + 2, 2)            \
 289                                         ST(i + 3, 3)    \
 290
 291
 292                 PF0(0)
 293                                 PF0(2)
 294
 295         " .align 32                     ;\n"
 296         " 1:                            ;\n"
 297
 298                 BLOCK(0)
 299                 BLOCK(4)
 300                 BLOCK(8)
 301                 BLOCK(12)
 302
 303         "       add %[inc], %[p1]       ;\n"
 304         "       add %[inc], %[p2]       ;\n"
 305         "       add %[inc], %[p3]       ;\n"
 306         "       add %[inc], %[p4]       ;\n"
 307         "       dec %[cnt]              ;\n"
 308         "       jnz 1b                  ;\n"
 309         : [cnt] "+r" (lines), [p1] "+r" (p1),
 310           [p2] "+r" (p2), [p3] "+r" (p3), [p4] "+r" (p4)
 311         : [inc] XOR_CONSTANT_CONSTRAINT (256UL)
 312         : "memory");
 313
 314         kernel_fpu_end();
 315 }
 316
 317 static void
 318 xor_sse_4_pf64(unsigned long bytes, unsigned long *p1, unsigned long *p2,
 319                unsigned long *p3, unsigned long *p4)
 320 {
 321         unsigned long lines = bytes >> 8;
 322
 323         kernel_fpu_begin();
 324
 325         asm volatile(
 326 #undef BLOCK
 327 #define BLOCK(i)                        \
 328                 BLK64(PF0, LD, i)       \
 329                 BLK64(PF1, XO1, i)      \
 330                 BLK64(PF2, XO2, i)      \
 331                 BLK64(PF3, XO3, i)      \
 332                 BLK64(NOP, ST, i)       \
 333
 334         " .align 32                     ;\n"
 335         " 1:                            ;\n"
 336
 337                 BLOCK(0)
 338                 BLOCK(4)
 339                 BLOCK(8)
 340                 BLOCK(12)
 341
 342         "       add %[inc], %[p1]       ;\n"
 343         "       add %[inc], %[p2]       ;\n"
 344         "       add %[inc], %[p3]       ;\n"
 345         "       add %[inc], %[p4]       ;\n"
 346         "       dec %[cnt]              ;\n"
 347         "       jnz 1b                  ;\n"
 348         : [cnt] "+r" (lines), [p1] "+r" (p1),
 349           [p2] "+r" (p2), [p3] "+r" (p3), [p4] "+r" (p4)
 350         : [inc] XOR_CONSTANT_CONSTRAINT (256UL)
 351         : "memory");
 352
 353         kernel_fpu_end();
 354 }
 355
 356 static void
 357 xor_sse_5(unsigned long bytes, unsigned long *p1, unsigned long *p2,
 358           unsigned long *p3, unsigned long *p4, unsigned long *p5)
 359 {
 360         unsigned long lines = bytes >> 8;
 361
 362         kernel_fpu_begin();
 363
 364         asm volatile(
 365 #undef BLOCK
 366 #define BLOCK(i) \
 367                 PF1(i)                                  \
 368                                 PF1(i + 2)              \
 369                 LD(i, 0)                                \
 370                         LD(i + 1, 1)                    \
 371                                 LD(i + 2, 2)            \
 372                                         LD(i + 3, 3)    \
 373                 PF2(i)                                  \
 374                                 PF2(i + 2)              \
 375                 XO1(i, 0)                               \
 376                         XO1(i + 1, 1)                   \
 377                                 XO1(i + 2, 2)           \
 378                                         XO1(i + 3, 3)   \
 379                 PF3(i)                                  \
 380                                 PF3(i + 2)              \
 381                 XO2(i, 0)                               \
 382                         XO2(i + 1, 1)                   \
 383                                 XO2(i + 2, 2)           \
 384                                         XO2(i + 3, 3)   \
 385                 PF4(i)                                  \
 386                                 PF4(i + 2)              \
 387                 PF0(i + 4)                              \
 388                                 PF0(i + 6)              \
 389                 XO3(i, 0)                               \
 390                         XO3(i + 1, 1)                   \
 391                                 XO3(i + 2, 2)           \
 392                                         XO3(i + 3, 3)   \
 393                 XO4(i, 0)                               \
 394                         XO4(i + 1, 1)                   \
 395                                 XO4(i + 2, 2)           \
 396                                         XO4(i + 3, 3)   \
 397                 ST(i, 0)                                \
 398                         ST(i + 1, 1)                    \
 399                                 ST(i + 2, 2)            \
 400                                         ST(i + 3, 3)    \
 401
 402
 403                 PF0(0)
 404                                 PF0(2)
 405
 406         " .align 32                     ;\n"
 407         " 1:                            ;\n"
 408
 409                 BLOCK(0)
 410                 BLOCK(4)
 411                 BLOCK(8)
 412                 BLOCK(12)
 413
 414         "       add %[inc], %[p1]       ;\n"
 415         "       add %[inc], %[p2]       ;\n"
 416         "       add %[inc], %[p3]       ;\n"
 417         "       add %[inc], %[p4]       ;\n"
 418         "       add %[inc], %[p5]       ;\n"
 419         "       dec %[cnt]              ;\n"
 420         "       jnz 1b                  ;\n"
 421         : [cnt] "+r" (lines), [p1] "+r" (p1), [p2] "+r" (p2),
 422           [p3] "+r" (p3), [p4] "+r" (p4), [p5] "+r" (p5)
 423         : [inc] XOR_CONSTANT_CONSTRAINT (256UL)
 424         : "memory");
 425
 426         kernel_fpu_end();
 427 }
 428
 429 static void
 430 xor_sse_5_pf64(unsigned long bytes, unsigned long *p1, unsigned long *p2,
 431                unsigned long *p3, unsigned long *p4, unsigned long *p5)
 432 {
 433         unsigned long lines = bytes >> 8;
 434
 435         kernel_fpu_begin();
 436
 437         asm volatile(
 438 #undef BLOCK
 439 #define BLOCK(i)                        \
 440                 BLK64(PF0, LD, i)       \
 441                 BLK64(PF1, XO1, i)      \
 442                 BLK64(PF2, XO2, i)      \
 443                 BLK64(PF3, XO3, i)      \
 444                 BLK64(PF4, XO4, i)      \
 445                 BLK64(NOP, ST, i)       \
 446
 447         " .align 32                     ;\n"
 448         " 1:                            ;\n"
 449
 450                 BLOCK(0)
 451                 BLOCK(4)
 452                 BLOCK(8)
 453                 BLOCK(12)
 454
 455         "       add %[inc], %[p1]       ;\n"
 456         "       add %[inc], %[p2]       ;\n"
 457         "       add %[inc], %[p3]       ;\n"
 458         "       add %[inc], %[p4]       ;\n"
 459         "       add %[inc], %[p5]       ;\n"
 460         "       dec %[cnt]              ;\n"
 461         "       jnz 1b                  ;\n"
 462         : [cnt] "+r" (lines), [p1] "+r" (p1), [p2] "+r" (p2),
 463           [p3] "+r" (p3), [p4] "+r" (p4), [p5] "+r" (p5)
 464         : [inc] XOR_CONSTANT_CONSTRAINT (256UL)
 465         : "memory");
 466
 467         kernel_fpu_end();
 468 }
 469
 470 static struct xor_block_template xor_block_sse_pf64 = {
 471         .name = "prefetch64-sse",
 472         .do_2 = xor_sse_2_pf64,
 473         .do_3 = xor_sse_3_pf64,
 474         .do_4 = xor_sse_4_pf64,
 475         .do_5 = xor_sse_5_pf64,
 476 };
 477
 478 #undef LD
 479 #undef XO1
 480 #undef XO2
 481 #undef XO3
 482 #undef XO4
 483 #undef ST
 484 #undef NOP
 485 #undef BLK64
 486 #undef BLOCK
 487
 488 #undef XOR_CONSTANT_CONSTRAINT
 489
 490 #ifdef CONFIG_X86_32
 491 # include <asm/xor_32.h>
 492 #else
 493 # include <asm/xor_64.h>
 494 #endif
 495
 496 #define XOR_SELECT_TEMPLATE(FASTEST) \
 497         AVX_SELECT(FASTEST)
 498
 499 #endif /* _ASM_X86_XOR_H */