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) 2003, 04, 05 Ralf Baechle (ralf@linux-mips.org) 7 * Copyright (C) 2007 Maciej W. Rozycki 8 * Copyright (C) 2008 Thiemo Seufer 9 * Copyright (C) 2012 MIPS Technologies, Inc. 10 */ 11 #include <linux/kernel.h> 12 #include <linux/sched.h> 13 #include <linux/smp.h> 14 #include <linux/mm.h> 15 #include <linux/proc_fs.h> 16 17 #include <asm/bugs.h> 18 #include <asm/cacheops.h> 19 #include <asm/cpu-type.h> 20 #include <asm/inst.h> 21 #include <asm/io.h> 22 #include <asm/page.h> 23 #include <asm/pgtable.h> 24 #include <asm/prefetch.h> 25 #include <asm/bootinfo.h> 26 #include <asm/mipsregs.h> 27 #include <asm/mmu_context.h> 28 #include <asm/cpu.h> 29 #include <asm/war.h> 30 31 #ifdef CONFIG_SIBYTE_DMA_PAGEOPS 32 #include <asm/sibyte/sb1250.h> 33 #include <asm/sibyte/sb1250_regs.h> 34 #include <asm/sibyte/sb1250_dma.h> 35 #endif 36 37 #include <asm/uasm.h> 38 39 /* Registers used in the assembled routines. */ 40 #define ZERO 0 41 #define AT 2 42 #define A0 4 43 #define A1 5 44 #define A2 6 45 #define T0 8 46 #define T1 9 47 #define T2 10 48 #define T3 11 49 #define T9 25 50 #define RA 31 51 52 /* Handle labels (which must be positive integers). */ 53 enum label_id { 54 label_clear_nopref = 1, 55 label_clear_pref, 56 label_copy_nopref, 57 label_copy_pref_both, 58 label_copy_pref_store, 59 }; 60 61 UASM_L_LA(_clear_nopref) 62 UASM_L_LA(_clear_pref) 63 UASM_L_LA(_copy_nopref) 64 UASM_L_LA(_copy_pref_both) 65 UASM_L_LA(_copy_pref_store) 66 67 /* We need one branch and therefore one relocation per target label. */ 68 static struct uasm_label labels[5]; 69 static struct uasm_reloc relocs[5]; 70 71 #define cpu_is_r4600_v1_x() ((read_c0_prid() & 0xfffffff0) == 0x00002010) 72 #define cpu_is_r4600_v2_x() ((read_c0_prid() & 0xfffffff0) == 0x00002020) 73 74 /* 75 * R6 has a limited offset of the pref instruction. 76 * Skip it if the offset is more than 9 bits. 77 */ 78 #define _uasm_i_pref(a, b, c, d) \ 79 do { \ 80 if (cpu_has_mips_r6) { \ 81 if (c <= 0xff && c >= -0x100) \ 82 uasm_i_pref(a, b, c, d);\ 83 } else { \ 84 uasm_i_pref(a, b, c, d); \ 85 } \ 86 } while(0) 87 88 static int pref_bias_clear_store; 89 static int pref_bias_copy_load; 90 static int pref_bias_copy_store; 91 92 static u32 pref_src_mode; 93 static u32 pref_dst_mode; 94 95 static int clear_word_size; 96 static int copy_word_size; 97 98 static int half_clear_loop_size; 99 static int half_copy_loop_size; 100 101 static int cache_line_size; 102 #define cache_line_mask() (cache_line_size - 1) 103 104 static inline void 105 pg_addiu(u32 **buf, unsigned int reg1, unsigned int reg2, unsigned int off) 106 { 107 if (cpu_has_64bit_gp_regs && DADDI_WAR && r4k_daddiu_bug()) { 108 if (off > 0x7fff) { 109 uasm_i_lui(buf, T9, uasm_rel_hi(off)); 110 uasm_i_addiu(buf, T9, T9, uasm_rel_lo(off)); 111 } else 112 uasm_i_addiu(buf, T9, ZERO, off); 113 uasm_i_daddu(buf, reg1, reg2, T9); 114 } else { 115 if (off > 0x7fff) { 116 uasm_i_lui(buf, T9, uasm_rel_hi(off)); 117 uasm_i_addiu(buf, T9, T9, uasm_rel_lo(off)); 118 UASM_i_ADDU(buf, reg1, reg2, T9); 119 } else 120 UASM_i_ADDIU(buf, reg1, reg2, off); 121 } 122 } 123 124 static void set_prefetch_parameters(void) 125 { 126 if (cpu_has_64bit_gp_regs || cpu_has_64bit_zero_reg) 127 clear_word_size = 8; 128 else 129 clear_word_size = 4; 130 131 if (cpu_has_64bit_gp_regs) 132 copy_word_size = 8; 133 else 134 copy_word_size = 4; 135 136 /* 137 * The pref's used here are using "streaming" hints, which cause the 138 * copied data to be kicked out of the cache sooner. A page copy often 139 * ends up copying a lot more data than is commonly used, so this seems 140 * to make sense in terms of reducing cache pollution, but I've no real 141 * performance data to back this up. 142 */ 143 if (cpu_has_prefetch) { 144 /* 145 * XXX: Most prefetch bias values in here are based on 146 * guesswork. 147 */ 148 cache_line_size = cpu_dcache_line_size(); 149 switch (current_cpu_type()) { 150 case CPU_R5500: 151 case CPU_TX49XX: 152 /* These processors only support the Pref_Load. */ 153 pref_bias_copy_load = 256; 154 break; 155 156 case CPU_R10000: 157 case CPU_R12000: 158 case CPU_R14000: 159 case CPU_R16000: 160 /* 161 * Those values have been experimentally tuned for an 162 * Origin 200. 163 */ 164 pref_bias_clear_store = 512; 165 pref_bias_copy_load = 256; 166 pref_bias_copy_store = 256; 167 pref_src_mode = Pref_LoadStreamed; 168 pref_dst_mode = Pref_StoreStreamed; 169 break; 170 171 case CPU_SB1: 172 case CPU_SB1A: 173 pref_bias_clear_store = 128; 174 pref_bias_copy_load = 128; 175 pref_bias_copy_store = 128; 176 /* 177 * SB1 pass1 Pref_LoadStreamed/Pref_StoreStreamed 178 * hints are broken. 179 */ 180 if (current_cpu_type() == CPU_SB1 && 181 (current_cpu_data.processor_id & 0xff) < 0x02) { 182 pref_src_mode = Pref_Load; 183 pref_dst_mode = Pref_Store; 184 } else { 185 pref_src_mode = Pref_LoadStreamed; 186 pref_dst_mode = Pref_StoreStreamed; 187 } 188 break; 189 190 case CPU_LOONGSON64: 191 /* Loongson-3 only support the Pref_Load/Pref_Store. */ 192 pref_bias_clear_store = 128; 193 pref_bias_copy_load = 128; 194 pref_bias_copy_store = 128; 195 pref_src_mode = Pref_Load; 196 pref_dst_mode = Pref_Store; 197 break; 198 199 default: 200 pref_bias_clear_store = 128; 201 pref_bias_copy_load = 256; 202 pref_bias_copy_store = 128; 203 pref_src_mode = Pref_LoadStreamed; 204 if (cpu_has_mips_r6) 205 /* 206 * Bit 30 (Pref_PrepareForStore) has been 207 * removed from MIPS R6. Use bit 5 208 * (Pref_StoreStreamed). 209 */ 210 pref_dst_mode = Pref_StoreStreamed; 211 else 212 pref_dst_mode = Pref_PrepareForStore; 213 break; 214 } 215 } else { 216 if (cpu_has_cache_cdex_s) 217 cache_line_size = cpu_scache_line_size(); 218 else if (cpu_has_cache_cdex_p) 219 cache_line_size = cpu_dcache_line_size(); 220 } 221 /* 222 * Too much unrolling will overflow the available space in 223 * clear_space_array / copy_page_array. 224 */ 225 half_clear_loop_size = min(16 * clear_word_size, 226 max(cache_line_size >> 1, 227 4 * clear_word_size)); 228 half_copy_loop_size = min(16 * copy_word_size, 229 max(cache_line_size >> 1, 230 4 * copy_word_size)); 231 } 232 233 static void build_clear_store(u32 **buf, int off) 234 { 235 if (cpu_has_64bit_gp_regs || cpu_has_64bit_zero_reg) { 236 uasm_i_sd(buf, ZERO, off, A0); 237 } else { 238 uasm_i_sw(buf, ZERO, off, A0); 239 } 240 } 241 242 static inline void build_clear_pref(u32 **buf, int off) 243 { 244 if (off & cache_line_mask()) 245 return; 246 247 if (pref_bias_clear_store) { 248 _uasm_i_pref(buf, pref_dst_mode, pref_bias_clear_store + off, 249 A0); 250 } else if (cache_line_size == (half_clear_loop_size << 1)) { 251 if (cpu_has_cache_cdex_s) { 252 uasm_i_cache(buf, Create_Dirty_Excl_SD, off, A0); 253 } else if (cpu_has_cache_cdex_p) { 254 if (R4600_V1_HIT_CACHEOP_WAR && cpu_is_r4600_v1_x()) { 255 uasm_i_nop(buf); 256 uasm_i_nop(buf); 257 uasm_i_nop(buf); 258 uasm_i_nop(buf); 259 } 260 261 if (R4600_V2_HIT_CACHEOP_WAR && cpu_is_r4600_v2_x()) 262 uasm_i_lw(buf, ZERO, ZERO, AT); 263 264 uasm_i_cache(buf, Create_Dirty_Excl_D, off, A0); 265 } 266 } 267 } 268 269 extern u32 __clear_page_start; 270 extern u32 __clear_page_end; 271 extern u32 __copy_page_start; 272 extern u32 __copy_page_end; 273 274 void build_clear_page(void) 275 { 276 int off; 277 u32 *buf = &__clear_page_start; 278 struct uasm_label *l = labels; 279 struct uasm_reloc *r = relocs; 280 int i; 281 static atomic_t run_once = ATOMIC_INIT(0); 282 283 if (atomic_xchg(&run_once, 1)) { 284 return; 285 } 286 287 memset(labels, 0, sizeof(labels)); 288 memset(relocs, 0, sizeof(relocs)); 289 290 set_prefetch_parameters(); 291 292 /* 293 * This algorithm makes the following assumptions: 294 * - The prefetch bias is a multiple of 2 words. 295 * - The prefetch bias is less than one page. 296 */ 297 BUG_ON(pref_bias_clear_store % (2 * clear_word_size)); 298 BUG_ON(PAGE_SIZE < pref_bias_clear_store); 299 300 off = PAGE_SIZE - pref_bias_clear_store; 301 if (off > 0xffff || !pref_bias_clear_store) 302 pg_addiu(&buf, A2, A0, off); 303 else 304 uasm_i_ori(&buf, A2, A0, off); 305 306 if (R4600_V2_HIT_CACHEOP_WAR && cpu_is_r4600_v2_x()) 307 uasm_i_lui(&buf, AT, uasm_rel_hi(0xa0000000)); 308 309 off = cache_line_size ? min(8, pref_bias_clear_store / cache_line_size) 310 * cache_line_size : 0; 311 while (off) { 312 build_clear_pref(&buf, -off); 313 off -= cache_line_size; 314 } 315 uasm_l_clear_pref(&l, buf); 316 do { 317 build_clear_pref(&buf, off); 318 build_clear_store(&buf, off); 319 off += clear_word_size; 320 } while (off < half_clear_loop_size); 321 pg_addiu(&buf, A0, A0, 2 * off); 322 off = -off; 323 do { 324 build_clear_pref(&buf, off); 325 if (off == -clear_word_size) 326 uasm_il_bne(&buf, &r, A0, A2, label_clear_pref); 327 build_clear_store(&buf, off); 328 off += clear_word_size; 329 } while (off < 0); 330 331 if (pref_bias_clear_store) { 332 pg_addiu(&buf, A2, A0, pref_bias_clear_store); 333 uasm_l_clear_nopref(&l, buf); 334 off = 0; 335 do { 336 build_clear_store(&buf, off); 337 off += clear_word_size; 338 } while (off < half_clear_loop_size); 339 pg_addiu(&buf, A0, A0, 2 * off); 340 off = -off; 341 do { 342 if (off == -clear_word_size) 343 uasm_il_bne(&buf, &r, A0, A2, 344 label_clear_nopref); 345 build_clear_store(&buf, off); 346 off += clear_word_size; 347 } while (off < 0); 348 } 349 350 uasm_i_jr(&buf, RA); 351 uasm_i_nop(&buf); 352 353 BUG_ON(buf > &__clear_page_end); 354 355 uasm_resolve_relocs(relocs, labels); 356 357 pr_debug("Synthesized clear page handler (%u instructions).\n", 358 (u32)(buf - &__clear_page_start)); 359 360 pr_debug("\t.set push\n"); 361 pr_debug("\t.set noreorder\n"); 362 for (i = 0; i < (buf - &__clear_page_start); i++) 363 pr_debug("\t.word 0x%08x\n", (&__clear_page_start)[i]); 364 pr_debug("\t.set pop\n"); 365 } 366 367 static void build_copy_load(u32 **buf, int reg, int off) 368 { 369 if (cpu_has_64bit_gp_regs) { 370 uasm_i_ld(buf, reg, off, A1); 371 } else { 372 uasm_i_lw(buf, reg, off, A1); 373 } 374 } 375 376 static void build_copy_store(u32 **buf, int reg, int off) 377 { 378 if (cpu_has_64bit_gp_regs) { 379 uasm_i_sd(buf, reg, off, A0); 380 } else { 381 uasm_i_sw(buf, reg, off, A0); 382 } 383 } 384 385 static inline void build_copy_load_pref(u32 **buf, int off) 386 { 387 if (off & cache_line_mask()) 388 return; 389 390 if (pref_bias_copy_load) 391 _uasm_i_pref(buf, pref_src_mode, pref_bias_copy_load + off, A1); 392 } 393 394 static inline void build_copy_store_pref(u32 **buf, int off) 395 { 396 if (off & cache_line_mask()) 397 return; 398 399 if (pref_bias_copy_store) { 400 _uasm_i_pref(buf, pref_dst_mode, pref_bias_copy_store + off, 401 A0); 402 } else if (cache_line_size == (half_copy_loop_size << 1)) { 403 if (cpu_has_cache_cdex_s) { 404 uasm_i_cache(buf, Create_Dirty_Excl_SD, off, A0); 405 } else if (cpu_has_cache_cdex_p) { 406 if (R4600_V1_HIT_CACHEOP_WAR && cpu_is_r4600_v1_x()) { 407 uasm_i_nop(buf); 408 uasm_i_nop(buf); 409 uasm_i_nop(buf); 410 uasm_i_nop(buf); 411 } 412 413 if (R4600_V2_HIT_CACHEOP_WAR && cpu_is_r4600_v2_x()) 414 uasm_i_lw(buf, ZERO, ZERO, AT); 415 416 uasm_i_cache(buf, Create_Dirty_Excl_D, off, A0); 417 } 418 } 419 } 420 421 void build_copy_page(void) 422 { 423 int off; 424 u32 *buf = &__copy_page_start; 425 struct uasm_label *l = labels; 426 struct uasm_reloc *r = relocs; 427 int i; 428 static atomic_t run_once = ATOMIC_INIT(0); 429 430 if (atomic_xchg(&run_once, 1)) { 431 return; 432 } 433 434 memset(labels, 0, sizeof(labels)); 435 memset(relocs, 0, sizeof(relocs)); 436 437 set_prefetch_parameters(); 438 439 /* 440 * This algorithm makes the following assumptions: 441 * - All prefetch biases are multiples of 8 words. 442 * - The prefetch biases are less than one page. 443 * - The store prefetch bias isn't greater than the load 444 * prefetch bias. 445 */ 446 BUG_ON(pref_bias_copy_load % (8 * copy_word_size)); 447 BUG_ON(pref_bias_copy_store % (8 * copy_word_size)); 448 BUG_ON(PAGE_SIZE < pref_bias_copy_load); 449 BUG_ON(pref_bias_copy_store > pref_bias_copy_load); 450 451 off = PAGE_SIZE - pref_bias_copy_load; 452 if (off > 0xffff || !pref_bias_copy_load) 453 pg_addiu(&buf, A2, A0, off); 454 else 455 uasm_i_ori(&buf, A2, A0, off); 456 457 if (R4600_V2_HIT_CACHEOP_WAR && cpu_is_r4600_v2_x()) 458 uasm_i_lui(&buf, AT, uasm_rel_hi(0xa0000000)); 459 460 off = cache_line_size ? min(8, pref_bias_copy_load / cache_line_size) * 461 cache_line_size : 0; 462 while (off) { 463 build_copy_load_pref(&buf, -off); 464 off -= cache_line_size; 465 } 466 off = cache_line_size ? min(8, pref_bias_copy_store / cache_line_size) * 467 cache_line_size : 0; 468 while (off) { 469 build_copy_store_pref(&buf, -off); 470 off -= cache_line_size; 471 } 472 uasm_l_copy_pref_both(&l, buf); 473 do { 474 build_copy_load_pref(&buf, off); 475 build_copy_load(&buf, T0, off); 476 build_copy_load_pref(&buf, off + copy_word_size); 477 build_copy_load(&buf, T1, off + copy_word_size); 478 build_copy_load_pref(&buf, off + 2 * copy_word_size); 479 build_copy_load(&buf, T2, off + 2 * copy_word_size); 480 build_copy_load_pref(&buf, off + 3 * copy_word_size); 481 build_copy_load(&buf, T3, off + 3 * copy_word_size); 482 build_copy_store_pref(&buf, off); 483 build_copy_store(&buf, T0, off); 484 build_copy_store_pref(&buf, off + copy_word_size); 485 build_copy_store(&buf, T1, off + copy_word_size); 486 build_copy_store_pref(&buf, off + 2 * copy_word_size); 487 build_copy_store(&buf, T2, off + 2 * copy_word_size); 488 build_copy_store_pref(&buf, off + 3 * copy_word_size); 489 build_copy_store(&buf, T3, off + 3 * copy_word_size); 490 off += 4 * copy_word_size; 491 } while (off < half_copy_loop_size); 492 pg_addiu(&buf, A1, A1, 2 * off); 493 pg_addiu(&buf, A0, A0, 2 * off); 494 off = -off; 495 do { 496 build_copy_load_pref(&buf, off); 497 build_copy_load(&buf, T0, off); 498 build_copy_load_pref(&buf, off + copy_word_size); 499 build_copy_load(&buf, T1, off + copy_word_size); 500 build_copy_load_pref(&buf, off + 2 * copy_word_size); 501 build_copy_load(&buf, T2, off + 2 * copy_word_size); 502 build_copy_load_pref(&buf, off + 3 * copy_word_size); 503 build_copy_load(&buf, T3, off + 3 * copy_word_size); 504 build_copy_store_pref(&buf, off); 505 build_copy_store(&buf, T0, off); 506 build_copy_store_pref(&buf, off + copy_word_size); 507 build_copy_store(&buf, T1, off + copy_word_size); 508 build_copy_store_pref(&buf, off + 2 * copy_word_size); 509 build_copy_store(&buf, T2, off + 2 * copy_word_size); 510 build_copy_store_pref(&buf, off + 3 * copy_word_size); 511 if (off == -(4 * copy_word_size)) 512 uasm_il_bne(&buf, &r, A2, A0, label_copy_pref_both); 513 build_copy_store(&buf, T3, off + 3 * copy_word_size); 514 off += 4 * copy_word_size; 515 } while (off < 0); 516 517 if (pref_bias_copy_load - pref_bias_copy_store) { 518 pg_addiu(&buf, A2, A0, 519 pref_bias_copy_load - pref_bias_copy_store); 520 uasm_l_copy_pref_store(&l, buf); 521 off = 0; 522 do { 523 build_copy_load(&buf, T0, off); 524 build_copy_load(&buf, T1, off + copy_word_size); 525 build_copy_load(&buf, T2, off + 2 * copy_word_size); 526 build_copy_load(&buf, T3, off + 3 * copy_word_size); 527 build_copy_store_pref(&buf, off); 528 build_copy_store(&buf, T0, off); 529 build_copy_store_pref(&buf, off + copy_word_size); 530 build_copy_store(&buf, T1, off + copy_word_size); 531 build_copy_store_pref(&buf, off + 2 * copy_word_size); 532 build_copy_store(&buf, T2, off + 2 * copy_word_size); 533 build_copy_store_pref(&buf, off + 3 * copy_word_size); 534 build_copy_store(&buf, T3, off + 3 * copy_word_size); 535 off += 4 * copy_word_size; 536 } while (off < half_copy_loop_size); 537 pg_addiu(&buf, A1, A1, 2 * off); 538 pg_addiu(&buf, A0, A0, 2 * off); 539 off = -off; 540 do { 541 build_copy_load(&buf, T0, off); 542 build_copy_load(&buf, T1, off + copy_word_size); 543 build_copy_load(&buf, T2, off + 2 * copy_word_size); 544 build_copy_load(&buf, T3, off + 3 * copy_word_size); 545 build_copy_store_pref(&buf, off); 546 build_copy_store(&buf, T0, off); 547 build_copy_store_pref(&buf, off + copy_word_size); 548 build_copy_store(&buf, T1, off + copy_word_size); 549 build_copy_store_pref(&buf, off + 2 * copy_word_size); 550 build_copy_store(&buf, T2, off + 2 * copy_word_size); 551 build_copy_store_pref(&buf, off + 3 * copy_word_size); 552 if (off == -(4 * copy_word_size)) 553 uasm_il_bne(&buf, &r, A2, A0, 554 label_copy_pref_store); 555 build_copy_store(&buf, T3, off + 3 * copy_word_size); 556 off += 4 * copy_word_size; 557 } while (off < 0); 558 } 559 560 if (pref_bias_copy_store) { 561 pg_addiu(&buf, A2, A0, pref_bias_copy_store); 562 uasm_l_copy_nopref(&l, buf); 563 off = 0; 564 do { 565 build_copy_load(&buf, T0, off); 566 build_copy_load(&buf, T1, off + copy_word_size); 567 build_copy_load(&buf, T2, off + 2 * copy_word_size); 568 build_copy_load(&buf, T3, off + 3 * copy_word_size); 569 build_copy_store(&buf, T0, off); 570 build_copy_store(&buf, T1, off + copy_word_size); 571 build_copy_store(&buf, T2, off + 2 * copy_word_size); 572 build_copy_store(&buf, T3, off + 3 * copy_word_size); 573 off += 4 * copy_word_size; 574 } while (off < half_copy_loop_size); 575 pg_addiu(&buf, A1, A1, 2 * off); 576 pg_addiu(&buf, A0, A0, 2 * off); 577 off = -off; 578 do { 579 build_copy_load(&buf, T0, off); 580 build_copy_load(&buf, T1, off + copy_word_size); 581 build_copy_load(&buf, T2, off + 2 * copy_word_size); 582 build_copy_load(&buf, T3, off + 3 * copy_word_size); 583 build_copy_store(&buf, T0, off); 584 build_copy_store(&buf, T1, off + copy_word_size); 585 build_copy_store(&buf, T2, off + 2 * copy_word_size); 586 if (off == -(4 * copy_word_size)) 587 uasm_il_bne(&buf, &r, A2, A0, 588 label_copy_nopref); 589 build_copy_store(&buf, T3, off + 3 * copy_word_size); 590 off += 4 * copy_word_size; 591 } while (off < 0); 592 } 593 594 uasm_i_jr(&buf, RA); 595 uasm_i_nop(&buf); 596 597 BUG_ON(buf > &__copy_page_end); 598 599 uasm_resolve_relocs(relocs, labels); 600 601 pr_debug("Synthesized copy page handler (%u instructions).\n", 602 (u32)(buf - &__copy_page_start)); 603 604 pr_debug("\t.set push\n"); 605 pr_debug("\t.set noreorder\n"); 606 for (i = 0; i < (buf - &__copy_page_start); i++) 607 pr_debug("\t.word 0x%08x\n", (&__copy_page_start)[i]); 608 pr_debug("\t.set pop\n"); 609 } 610 611 #ifdef CONFIG_SIBYTE_DMA_PAGEOPS 612 extern void clear_page_cpu(void *page); 613 extern void copy_page_cpu(void *to, void *from); 614 615 /* 616 * Pad descriptors to cacheline, since each is exclusively owned by a 617 * particular CPU. 618 */ 619 struct dmadscr { 620 u64 dscr_a; 621 u64 dscr_b; 622 u64 pad_a; 623 u64 pad_b; 624 } ____cacheline_aligned_in_smp page_descr[DM_NUM_CHANNELS]; 625 626 void clear_page(void *page) 627 { 628 u64 to_phys = CPHYSADDR((unsigned long)page); 629 unsigned int cpu = smp_processor_id(); 630 631 /* if the page is not in KSEG0, use old way */ 632 if ((long)KSEGX((unsigned long)page) != (long)CKSEG0) 633 return clear_page_cpu(page); 634 635 page_descr[cpu].dscr_a = to_phys | M_DM_DSCRA_ZERO_MEM | 636 M_DM_DSCRA_L2C_DEST | M_DM_DSCRA_INTERRUPT; 637 page_descr[cpu].dscr_b = V_DM_DSCRB_SRC_LENGTH(PAGE_SIZE); 638 __raw_writeq(1, IOADDR(A_DM_REGISTER(cpu, R_DM_DSCR_COUNT))); 639 640 /* 641 * Don't really want to do it this way, but there's no 642 * reliable way to delay completion detection. 643 */ 644 while (!(__raw_readq(IOADDR(A_DM_REGISTER(cpu, R_DM_DSCR_BASE_DEBUG))) 645 & M_DM_DSCR_BASE_INTERRUPT)) 646 ; 647 __raw_readq(IOADDR(A_DM_REGISTER(cpu, R_DM_DSCR_BASE))); 648 } 649 EXPORT_SYMBOL(clear_page); 650 651 void copy_page(void *to, void *from) 652 { 653 u64 from_phys = CPHYSADDR((unsigned long)from); 654 u64 to_phys = CPHYSADDR((unsigned long)to); 655 unsigned int cpu = smp_processor_id(); 656 657 /* if any page is not in KSEG0, use old way */ 658 if ((long)KSEGX((unsigned long)to) != (long)CKSEG0 659 || (long)KSEGX((unsigned long)from) != (long)CKSEG0) 660 return copy_page_cpu(to, from); 661 662 page_descr[cpu].dscr_a = to_phys | M_DM_DSCRA_L2C_DEST | 663 M_DM_DSCRA_INTERRUPT; 664 page_descr[cpu].dscr_b = from_phys | V_DM_DSCRB_SRC_LENGTH(PAGE_SIZE); 665 __raw_writeq(1, IOADDR(A_DM_REGISTER(cpu, R_DM_DSCR_COUNT))); 666 667 /* 668 * Don't really want to do it this way, but there's no 669 * reliable way to delay completion detection. 670 */ 671 while (!(__raw_readq(IOADDR(A_DM_REGISTER(cpu, R_DM_DSCR_BASE_DEBUG))) 672 & M_DM_DSCR_BASE_INTERRUPT)) 673 ; 674 __raw_readq(IOADDR(A_DM_REGISTER(cpu, R_DM_DSCR_BASE))); 675 } 676 EXPORT_SYMBOL(copy_page); 677 678 #endif /* CONFIG_SIBYTE_DMA_PAGEOPS */ 679