1/* SPDX-License-Identifier: GPL-2.0 */ 2/* NGmemcpy.S: Niagara optimized memcpy. 3 * 4 * Copyright (C) 2006, 2007 David S. Miller (davem@davemloft.net) 5 */ 6 7#ifdef __KERNEL__ 8#include <linux/linkage.h> 9#include <asm/asi.h> 10#include <asm/thread_info.h> 11#define GLOBAL_SPARE %g7 12#define RESTORE_ASI(TMP) \ 13 ldub [%g6 + TI_CURRENT_DS], TMP; \ 14 wr TMP, 0x0, %asi; 15#else 16#define GLOBAL_SPARE %g5 17#define RESTORE_ASI(TMP) \ 18 wr %g0, ASI_PNF, %asi 19#endif 20 21#ifdef __sparc_v9__ 22#define SAVE_AMOUNT 128 23#else 24#define SAVE_AMOUNT 64 25#endif 26 27#ifndef STORE_ASI 28#define STORE_ASI ASI_BLK_INIT_QUAD_LDD_P 29#endif 30 31#ifndef EX_LD 32#define EX_LD(x,y) x 33#endif 34 35#ifndef EX_ST 36#define EX_ST(x,y) x 37#endif 38 39#ifndef LOAD 40#ifndef MEMCPY_DEBUG 41#define LOAD(type,addr,dest) type [addr], dest 42#else 43#define LOAD(type,addr,dest) type##a [addr] 0x80, dest 44#endif 45#endif 46 47#ifndef LOAD_TWIN 48#define LOAD_TWIN(addr_reg,dest0,dest1) \ 49 ldda [addr_reg] ASI_BLK_INIT_QUAD_LDD_P, dest0 50#endif 51 52#ifndef STORE 53#define STORE(type,src,addr) type src, [addr] 54#endif 55 56#ifndef STORE_INIT 57#ifndef SIMULATE_NIAGARA_ON_NON_NIAGARA 58#define STORE_INIT(src,addr) stxa src, [addr] %asi 59#else 60#define STORE_INIT(src,addr) stx src, [addr + 0x00] 61#endif 62#endif 63 64#ifndef FUNC_NAME 65#define FUNC_NAME NGmemcpy 66#endif 67 68#ifndef PREAMBLE 69#define PREAMBLE 70#endif 71 72#ifndef XCC 73#define XCC xcc 74#endif 75 76 .register %g2,#scratch 77 .register %g3,#scratch 78 79 .text 80#ifndef EX_RETVAL 81#define EX_RETVAL(x) x 82__restore_asi: 83 ret 84 wr %g0, ASI_AIUS, %asi 85 restore 86ENTRY(NG_ret_i2_plus_i4_plus_1) 87 ba,pt %xcc, __restore_asi 88 add %i2, %i5, %i0 89ENDPROC(NG_ret_i2_plus_i4_plus_1) 90ENTRY(NG_ret_i2_plus_g1) 91 ba,pt %xcc, __restore_asi 92 add %i2, %g1, %i0 93ENDPROC(NG_ret_i2_plus_g1) 94ENTRY(NG_ret_i2_plus_g1_minus_8) 95 sub %g1, 8, %g1 96 ba,pt %xcc, __restore_asi 97 add %i2, %g1, %i0 98ENDPROC(NG_ret_i2_plus_g1_minus_8) 99ENTRY(NG_ret_i2_plus_g1_minus_16) 100 sub %g1, 16, %g1 101 ba,pt %xcc, __restore_asi 102 add %i2, %g1, %i0 103ENDPROC(NG_ret_i2_plus_g1_minus_16) 104ENTRY(NG_ret_i2_plus_g1_minus_24) 105 sub %g1, 24, %g1 106 ba,pt %xcc, __restore_asi 107 add %i2, %g1, %i0 108ENDPROC(NG_ret_i2_plus_g1_minus_24) 109ENTRY(NG_ret_i2_plus_g1_minus_32) 110 sub %g1, 32, %g1 111 ba,pt %xcc, __restore_asi 112 add %i2, %g1, %i0 113ENDPROC(NG_ret_i2_plus_g1_minus_32) 114ENTRY(NG_ret_i2_plus_g1_minus_40) 115 sub %g1, 40, %g1 116 ba,pt %xcc, __restore_asi 117 add %i2, %g1, %i0 118ENDPROC(NG_ret_i2_plus_g1_minus_40) 119ENTRY(NG_ret_i2_plus_g1_minus_48) 120 sub %g1, 48, %g1 121 ba,pt %xcc, __restore_asi 122 add %i2, %g1, %i0 123ENDPROC(NG_ret_i2_plus_g1_minus_48) 124ENTRY(NG_ret_i2_plus_g1_minus_56) 125 sub %g1, 56, %g1 126 ba,pt %xcc, __restore_asi 127 add %i2, %g1, %i0 128ENDPROC(NG_ret_i2_plus_g1_minus_56) 129ENTRY(NG_ret_i2_plus_i4) 130 ba,pt %xcc, __restore_asi 131 add %i2, %i4, %i0 132ENDPROC(NG_ret_i2_plus_i4) 133ENTRY(NG_ret_i2_plus_i4_minus_8) 134 sub %i4, 8, %i4 135 ba,pt %xcc, __restore_asi 136 add %i2, %i4, %i0 137ENDPROC(NG_ret_i2_plus_i4_minus_8) 138ENTRY(NG_ret_i2_plus_8) 139 ba,pt %xcc, __restore_asi 140 add %i2, 8, %i0 141ENDPROC(NG_ret_i2_plus_8) 142ENTRY(NG_ret_i2_plus_4) 143 ba,pt %xcc, __restore_asi 144 add %i2, 4, %i0 145ENDPROC(NG_ret_i2_plus_4) 146ENTRY(NG_ret_i2_plus_1) 147 ba,pt %xcc, __restore_asi 148 add %i2, 1, %i0 149ENDPROC(NG_ret_i2_plus_1) 150ENTRY(NG_ret_i2_plus_g1_plus_1) 151 add %g1, 1, %g1 152 ba,pt %xcc, __restore_asi 153 add %i2, %g1, %i0 154ENDPROC(NG_ret_i2_plus_g1_plus_1) 155ENTRY(NG_ret_i2) 156 ba,pt %xcc, __restore_asi 157 mov %i2, %i0 158ENDPROC(NG_ret_i2) 159ENTRY(NG_ret_i2_and_7_plus_i4) 160 and %i2, 7, %i2 161 ba,pt %xcc, __restore_asi 162 add %i2, %i4, %i0 163ENDPROC(NG_ret_i2_and_7_plus_i4) 164#endif 165 166 .align 64 167 168 .globl FUNC_NAME 169 .type FUNC_NAME,#function 170FUNC_NAME: /* %i0=dst, %i1=src, %i2=len */ 171 PREAMBLE 172 save %sp, -SAVE_AMOUNT, %sp 173 srlx %i2, 31, %g2 174 cmp %g2, 0 175 tne %xcc, 5 176 mov %i0, %o0 177 cmp %i2, 0 178 be,pn %XCC, 85f 179 or %o0, %i1, %i3 180 cmp %i2, 16 181 blu,a,pn %XCC, 80f 182 or %i3, %i2, %i3 183 184 /* 2 blocks (128 bytes) is the minimum we can do the block 185 * copy with. We need to ensure that we'll iterate at least 186 * once in the block copy loop. At worst we'll need to align 187 * the destination to a 64-byte boundary which can chew up 188 * to (64 - 1) bytes from the length before we perform the 189 * block copy loop. 190 */ 191 cmp %i2, (2 * 64) 192 blu,pt %XCC, 70f 193 andcc %i3, 0x7, %g0 194 195 /* %o0: dst 196 * %i1: src 197 * %i2: len (known to be >= 128) 198 * 199 * The block copy loops will use %i4/%i5,%g2/%g3 as 200 * temporaries while copying the data. 201 */ 202 203 LOAD(prefetch, %i1, #one_read) 204 wr %g0, STORE_ASI, %asi 205 206 /* Align destination on 64-byte boundary. */ 207 andcc %o0, (64 - 1), %i4 208 be,pt %XCC, 2f 209 sub %i4, 64, %i4 210 sub %g0, %i4, %i4 ! bytes to align dst 211 sub %i2, %i4, %i2 2121: subcc %i4, 1, %i4 213 EX_LD(LOAD(ldub, %i1, %g1), NG_ret_i2_plus_i4_plus_1) 214 EX_ST(STORE(stb, %g1, %o0), NG_ret_i2_plus_i4_plus_1) 215 add %i1, 1, %i1 216 bne,pt %XCC, 1b 217 add %o0, 1, %o0 218 219 /* If the source is on a 16-byte boundary we can do 220 * the direct block copy loop. If it is 8-byte aligned 221 * we can do the 16-byte loads offset by -8 bytes and the 222 * init stores offset by one register. 223 * 224 * If the source is not even 8-byte aligned, we need to do 225 * shifting and masking (basically integer faligndata). 226 * 227 * The careful bit with init stores is that if we store 228 * to any part of the cache line we have to store the whole 229 * cacheline else we can end up with corrupt L2 cache line 230 * contents. Since the loop works on 64-bytes of 64-byte 231 * aligned store data at a time, this is easy to ensure. 232 */ 2332: 234 andcc %i1, (16 - 1), %i4 235 andn %i2, (64 - 1), %g1 ! block copy loop iterator 236 be,pt %XCC, 50f 237 sub %i2, %g1, %i2 ! final sub-block copy bytes 238 239 cmp %i4, 8 240 be,pt %XCC, 10f 241 sub %i1, %i4, %i1 242 243 /* Neither 8-byte nor 16-byte aligned, shift and mask. */ 244 and %i4, 0x7, GLOBAL_SPARE 245 sll GLOBAL_SPARE, 3, GLOBAL_SPARE 246 mov 64, %i5 247 EX_LD(LOAD_TWIN(%i1, %g2, %g3), NG_ret_i2_plus_g1) 248 sub %i5, GLOBAL_SPARE, %i5 249 mov 16, %o4 250 mov 32, %o5 251 mov 48, %o7 252 mov 64, %i3 253 254 bg,pn %XCC, 9f 255 nop 256 257#define MIX_THREE_WORDS(WORD1, WORD2, WORD3, PRE_SHIFT, POST_SHIFT, TMP) \ 258 sllx WORD1, POST_SHIFT, WORD1; \ 259 srlx WORD2, PRE_SHIFT, TMP; \ 260 sllx WORD2, POST_SHIFT, WORD2; \ 261 or WORD1, TMP, WORD1; \ 262 srlx WORD3, PRE_SHIFT, TMP; \ 263 or WORD2, TMP, WORD2; 264 2658: EX_LD(LOAD_TWIN(%i1 + %o4, %o2, %o3), NG_ret_i2_plus_g1) 266 MIX_THREE_WORDS(%g2, %g3, %o2, %i5, GLOBAL_SPARE, %o1) 267 LOAD(prefetch, %i1 + %i3, #one_read) 268 269 EX_ST(STORE_INIT(%g2, %o0 + 0x00), NG_ret_i2_plus_g1) 270 EX_ST(STORE_INIT(%g3, %o0 + 0x08), NG_ret_i2_plus_g1_minus_8) 271 272 EX_LD(LOAD_TWIN(%i1 + %o5, %g2, %g3), NG_ret_i2_plus_g1_minus_16) 273 MIX_THREE_WORDS(%o2, %o3, %g2, %i5, GLOBAL_SPARE, %o1) 274 275 EX_ST(STORE_INIT(%o2, %o0 + 0x10), NG_ret_i2_plus_g1_minus_16) 276 EX_ST(STORE_INIT(%o3, %o0 + 0x18), NG_ret_i2_plus_g1_minus_24) 277 278 EX_LD(LOAD_TWIN(%i1 + %o7, %o2, %o3), NG_ret_i2_plus_g1_minus_32) 279 MIX_THREE_WORDS(%g2, %g3, %o2, %i5, GLOBAL_SPARE, %o1) 280 281 EX_ST(STORE_INIT(%g2, %o0 + 0x20), NG_ret_i2_plus_g1_minus_32) 282 EX_ST(STORE_INIT(%g3, %o0 + 0x28), NG_ret_i2_plus_g1_minus_40) 283 284 EX_LD(LOAD_TWIN(%i1 + %i3, %g2, %g3), NG_ret_i2_plus_g1_minus_48) 285 add %i1, 64, %i1 286 MIX_THREE_WORDS(%o2, %o3, %g2, %i5, GLOBAL_SPARE, %o1) 287 288 EX_ST(STORE_INIT(%o2, %o0 + 0x30), NG_ret_i2_plus_g1_minus_48) 289 EX_ST(STORE_INIT(%o3, %o0 + 0x38), NG_ret_i2_plus_g1_minus_56) 290 291 subcc %g1, 64, %g1 292 bne,pt %XCC, 8b 293 add %o0, 64, %o0 294 295 ba,pt %XCC, 60f 296 add %i1, %i4, %i1 297 2989: EX_LD(LOAD_TWIN(%i1 + %o4, %o2, %o3), NG_ret_i2_plus_g1) 299 MIX_THREE_WORDS(%g3, %o2, %o3, %i5, GLOBAL_SPARE, %o1) 300 LOAD(prefetch, %i1 + %i3, #one_read) 301 302 EX_ST(STORE_INIT(%g3, %o0 + 0x00), NG_ret_i2_plus_g1) 303 EX_ST(STORE_INIT(%o2, %o0 + 0x08), NG_ret_i2_plus_g1_minus_8) 304 305 EX_LD(LOAD_TWIN(%i1 + %o5, %g2, %g3), NG_ret_i2_plus_g1_minus_16) 306 MIX_THREE_WORDS(%o3, %g2, %g3, %i5, GLOBAL_SPARE, %o1) 307 308 EX_ST(STORE_INIT(%o3, %o0 + 0x10), NG_ret_i2_plus_g1_minus_16) 309 EX_ST(STORE_INIT(%g2, %o0 + 0x18), NG_ret_i2_plus_g1_minus_24) 310 311 EX_LD(LOAD_TWIN(%i1 + %o7, %o2, %o3), NG_ret_i2_plus_g1_minus_32) 312 MIX_THREE_WORDS(%g3, %o2, %o3, %i5, GLOBAL_SPARE, %o1) 313 314 EX_ST(STORE_INIT(%g3, %o0 + 0x20), NG_ret_i2_plus_g1_minus_32) 315 EX_ST(STORE_INIT(%o2, %o0 + 0x28), NG_ret_i2_plus_g1_minus_40) 316 317 EX_LD(LOAD_TWIN(%i1 + %i3, %g2, %g3), NG_ret_i2_plus_g1_minus_48) 318 add %i1, 64, %i1 319 MIX_THREE_WORDS(%o3, %g2, %g3, %i5, GLOBAL_SPARE, %o1) 320 321 EX_ST(STORE_INIT(%o3, %o0 + 0x30), NG_ret_i2_plus_g1_minus_48) 322 EX_ST(STORE_INIT(%g2, %o0 + 0x38), NG_ret_i2_plus_g1_minus_56) 323 324 subcc %g1, 64, %g1 325 bne,pt %XCC, 9b 326 add %o0, 64, %o0 327 328 ba,pt %XCC, 60f 329 add %i1, %i4, %i1 330 33110: /* Destination is 64-byte aligned, source was only 8-byte 332 * aligned but it has been subtracted by 8 and we perform 333 * one twin load ahead, then add 8 back into source when 334 * we finish the loop. 335 */ 336 EX_LD(LOAD_TWIN(%i1, %o4, %o5), NG_ret_i2_plus_g1) 337 mov 16, %o7 338 mov 32, %g2 339 mov 48, %g3 340 mov 64, %o1 3411: EX_LD(LOAD_TWIN(%i1 + %o7, %o2, %o3), NG_ret_i2_plus_g1) 342 LOAD(prefetch, %i1 + %o1, #one_read) 343 EX_ST(STORE_INIT(%o5, %o0 + 0x00), NG_ret_i2_plus_g1) ! initializes cache line 344 EX_ST(STORE_INIT(%o2, %o0 + 0x08), NG_ret_i2_plus_g1_minus_8) 345 EX_LD(LOAD_TWIN(%i1 + %g2, %o4, %o5), NG_ret_i2_plus_g1_minus_16) 346 EX_ST(STORE_INIT(%o3, %o0 + 0x10), NG_ret_i2_plus_g1_minus_16) 347 EX_ST(STORE_INIT(%o4, %o0 + 0x18), NG_ret_i2_plus_g1_minus_24) 348 EX_LD(LOAD_TWIN(%i1 + %g3, %o2, %o3), NG_ret_i2_plus_g1_minus_32) 349 EX_ST(STORE_INIT(%o5, %o0 + 0x20), NG_ret_i2_plus_g1_minus_32) 350 EX_ST(STORE_INIT(%o2, %o0 + 0x28), NG_ret_i2_plus_g1_minus_40) 351 EX_LD(LOAD_TWIN(%i1 + %o1, %o4, %o5), NG_ret_i2_plus_g1_minus_48) 352 add %i1, 64, %i1 353 EX_ST(STORE_INIT(%o3, %o0 + 0x30), NG_ret_i2_plus_g1_minus_48) 354 EX_ST(STORE_INIT(%o4, %o0 + 0x38), NG_ret_i2_plus_g1_minus_56) 355 subcc %g1, 64, %g1 356 bne,pt %XCC, 1b 357 add %o0, 64, %o0 358 359 ba,pt %XCC, 60f 360 add %i1, 0x8, %i1 361 36250: /* Destination is 64-byte aligned, and source is 16-byte 363 * aligned. 364 */ 365 mov 16, %o7 366 mov 32, %g2 367 mov 48, %g3 368 mov 64, %o1 3691: EX_LD(LOAD_TWIN(%i1 + %g0, %o4, %o5), NG_ret_i2_plus_g1) 370 EX_LD(LOAD_TWIN(%i1 + %o7, %o2, %o3), NG_ret_i2_plus_g1) 371 LOAD(prefetch, %i1 + %o1, #one_read) 372 EX_ST(STORE_INIT(%o4, %o0 + 0x00), NG_ret_i2_plus_g1) ! initializes cache line 373 EX_ST(STORE_INIT(%o5, %o0 + 0x08), NG_ret_i2_plus_g1_minus_8) 374 EX_LD(LOAD_TWIN(%i1 + %g2, %o4, %o5), NG_ret_i2_plus_g1_minus_16) 375 EX_ST(STORE_INIT(%o2, %o0 + 0x10), NG_ret_i2_plus_g1_minus_16) 376 EX_ST(STORE_INIT(%o3, %o0 + 0x18), NG_ret_i2_plus_g1_minus_24) 377 EX_LD(LOAD_TWIN(%i1 + %g3, %o2, %o3), NG_ret_i2_plus_g1_minus_32) 378 add %i1, 64, %i1 379 EX_ST(STORE_INIT(%o4, %o0 + 0x20), NG_ret_i2_plus_g1_minus_32) 380 EX_ST(STORE_INIT(%o5, %o0 + 0x28), NG_ret_i2_plus_g1_minus_40) 381 EX_ST(STORE_INIT(%o2, %o0 + 0x30), NG_ret_i2_plus_g1_minus_48) 382 EX_ST(STORE_INIT(%o3, %o0 + 0x38), NG_ret_i2_plus_g1_minus_56) 383 subcc %g1, 64, %g1 384 bne,pt %XCC, 1b 385 add %o0, 64, %o0 386 /* fall through */ 387 38860: 389 membar #Sync 390 391 /* %i2 contains any final bytes still needed to be copied 392 * over. If anything is left, we copy it one byte at a time. 393 */ 394 RESTORE_ASI(%i3) 395 brz,pt %i2, 85f 396 sub %o0, %i1, %i3 397 ba,a,pt %XCC, 90f 398 nop 399 400 .align 64 40170: /* 16 < len <= 64 */ 402 bne,pn %XCC, 75f 403 sub %o0, %i1, %i3 404 40572: 406 andn %i2, 0xf, %i4 407 and %i2, 0xf, %i2 4081: subcc %i4, 0x10, %i4 409 EX_LD(LOAD(ldx, %i1, %o4), NG_ret_i2_plus_i4) 410 add %i1, 0x08, %i1 411 EX_LD(LOAD(ldx, %i1, %g1), NG_ret_i2_plus_i4) 412 sub %i1, 0x08, %i1 413 EX_ST(STORE(stx, %o4, %i1 + %i3), NG_ret_i2_plus_i4) 414 add %i1, 0x8, %i1 415 EX_ST(STORE(stx, %g1, %i1 + %i3), NG_ret_i2_plus_i4_minus_8) 416 bgu,pt %XCC, 1b 417 add %i1, 0x8, %i1 41873: andcc %i2, 0x8, %g0 419 be,pt %XCC, 1f 420 nop 421 sub %i2, 0x8, %i2 422 EX_LD(LOAD(ldx, %i1, %o4), NG_ret_i2_plus_8) 423 EX_ST(STORE(stx, %o4, %i1 + %i3), NG_ret_i2_plus_8) 424 add %i1, 0x8, %i1 4251: andcc %i2, 0x4, %g0 426 be,pt %XCC, 1f 427 nop 428 sub %i2, 0x4, %i2 429 EX_LD(LOAD(lduw, %i1, %i5), NG_ret_i2_plus_4) 430 EX_ST(STORE(stw, %i5, %i1 + %i3), NG_ret_i2_plus_4) 431 add %i1, 0x4, %i1 4321: cmp %i2, 0 433 be,pt %XCC, 85f 434 nop 435 ba,pt %xcc, 90f 436 nop 437 43875: 439 andcc %o0, 0x7, %g1 440 sub %g1, 0x8, %g1 441 be,pn %icc, 2f 442 sub %g0, %g1, %g1 443 sub %i2, %g1, %i2 444 4451: subcc %g1, 1, %g1 446 EX_LD(LOAD(ldub, %i1, %i5), NG_ret_i2_plus_g1_plus_1) 447 EX_ST(STORE(stb, %i5, %i1 + %i3), NG_ret_i2_plus_g1_plus_1) 448 bgu,pt %icc, 1b 449 add %i1, 1, %i1 450 4512: add %i1, %i3, %o0 452 andcc %i1, 0x7, %g1 453 bne,pt %icc, 8f 454 sll %g1, 3, %g1 455 456 cmp %i2, 16 457 bgeu,pt %icc, 72b 458 nop 459 ba,a,pt %xcc, 73b 460 4618: mov 64, %i3 462 andn %i1, 0x7, %i1 463 EX_LD(LOAD(ldx, %i1, %g2), NG_ret_i2) 464 sub %i3, %g1, %i3 465 andn %i2, 0x7, %i4 466 sllx %g2, %g1, %g2 4671: add %i1, 0x8, %i1 468 EX_LD(LOAD(ldx, %i1, %g3), NG_ret_i2_and_7_plus_i4) 469 subcc %i4, 0x8, %i4 470 srlx %g3, %i3, %i5 471 or %i5, %g2, %i5 472 EX_ST(STORE(stx, %i5, %o0), NG_ret_i2_and_7_plus_i4) 473 add %o0, 0x8, %o0 474 bgu,pt %icc, 1b 475 sllx %g3, %g1, %g2 476 477 srl %g1, 3, %g1 478 andcc %i2, 0x7, %i2 479 be,pn %icc, 85f 480 add %i1, %g1, %i1 481 ba,pt %xcc, 90f 482 sub %o0, %i1, %i3 483 484 .align 64 48580: /* 0 < len <= 16 */ 486 andcc %i3, 0x3, %g0 487 bne,pn %XCC, 90f 488 sub %o0, %i1, %i3 489 4901: 491 subcc %i2, 4, %i2 492 EX_LD(LOAD(lduw, %i1, %g1), NG_ret_i2_plus_4) 493 EX_ST(STORE(stw, %g1, %i1 + %i3), NG_ret_i2_plus_4) 494 bgu,pt %XCC, 1b 495 add %i1, 4, %i1 496 49785: ret 498 restore EX_RETVAL(%i0), %g0, %o0 499 500 .align 32 50190: 502 subcc %i2, 1, %i2 503 EX_LD(LOAD(ldub, %i1, %g1), NG_ret_i2_plus_1) 504 EX_ST(STORE(stb, %g1, %i1 + %i3), NG_ret_i2_plus_1) 505 bgu,pt %XCC, 90b 506 add %i1, 1, %i1 507 ret 508 restore EX_RETVAL(%i0), %g0, %o0 509 510 .size FUNC_NAME, .-FUNC_NAME 511
