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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 | /* $Id: U3copy_to_user.S,v 1.3 2000/11/01 09:29:19 davem Exp $ * U3memcpy.S: UltraSparc-III optimized copy to userspace. * * Copyright (C) 1999, 2000 David S. Miller (davem@redhat.com) */ #ifdef __KERNEL__ #include <asm/visasm.h> #include <asm/asi.h> #undef SMALL_COPY_USES_FPU #define EXNV(x,y,a,b) \ 98: x,y; \ .section .fixup; \ .align 4; \ 99: retl; \ a, b, %o0; \ .section __ex_table; \ .align 4; \ .word 98b, 99b; \ .text; \ .align 4; #define EXNV2(x,y,a,b) \ 98: x,y; \ .section .fixup; \ .align 4; \ 99: a, b, %o0; \ retl; \ add %o0, 1, %o0; \ .section __ex_table; \ .align 4; \ .word 98b, 99b; \ .text; \ .align 4; #define EXNV3(x,y,a,b) \ 98: x,y; \ .section .fixup; \ .align 4; \ 99: a, b, %o0; \ retl; \ add %o0, 8, %o0; \ .section __ex_table; \ .align 4; \ .word 98b, 99b; \ .text; \ .align 4; #define EX(x,y,a,b) \ 98: x,y; \ .section .fixup; \ .align 4; \ 99: VISExitHalf; \ retl; \ a, b, %o0; \ .section __ex_table; \ .align 4; \ .word 98b, 99b; \ .text; \ .align 4; #define EXBLK1(x,y) \ 98: x,y; \ .section .fixup; \ .align 4; \ 99: VISExitHalf; \ add %o4, 0x1c0, %o1; \ and %o2, (0x40 - 1), %o2; \ retl; \ add %o1, %o2, %o0; \ .section __ex_table; \ .align 4; \ .word 98b, 99b; \ .text; \ .align 4; #define EXBLK2(x,y) \ 98: x,y; \ .section .fixup; \ .align 4; \ 99: VISExitHalf; \ sll %o3, 6, %o3; \ and %o2, (0x40 - 1), %o2; \ add %o3, 0x80, %o1; \ retl; \ add %o1, %o2, %o0; \ .section __ex_table; \ .align 4; \ .word 98b, 99b; \ .text; \ .align 4; #define EXBLK3(x,y) \ 98: x,y; \ .section .fixup; \ .align 4; \ 99: VISExitHalf; \ and %o2, (0x40 - 1), %o2; \ retl; \ add %o2, 0x80, %o0; \ .section __ex_table; \ .align 4; \ .word 98b, 99b; \ .text; \ .align 4; #define EXBLK4(x,y) \ 98: x,y; \ .section .fixup; \ .align 4; \ 99: VISExitHalf; \ and %o2, (0x40 - 1), %o2; \ retl; \ add %o2, 0x40, %o0; \ .section __ex_table; \ .align 4; \ .word 98b, 99b; \ .text; \ .align 4; #else #define ASI_AIUS 0x80 #define ASI_BLK_AIUS 0xf0 #define FPRS_FEF 0x04 #define VISEntryHalf rd %fprs, %o5; wr %g0, FPRS_FEF, %fprs #define VISExitHalf and %o5, FPRS_FEF, %o5; wr %o5, 0x0, %fprs #define SMALL_COPY_USES_FPU #define EXNV(x,y,a,b) x,y; #define EXNV2(x,y,a,b) x,y; #define EXNV3(x,y,a,b) x,y; #define EX(x,y,a,b) x,y; #define EXBLK1(x,y) x,y; #define EXBLK2(x,y) x,y; #define EXBLK3(x,y) x,y; #define EXBLK4(x,y) x,y; #endif /* Special/non-trivial issues of this code: * * 1) %o5 is preserved from VISEntryHalf to VISExitHalf * 2) Only low 32 FPU registers are used so that only the * lower half of the FPU register set is dirtied by this * code. This is especially important in the kernel. * 3) This code never prefetches cachelines past the end * of the source buffer. */ .text .align 32 /* The cheetah's flexible spine, oversized liver, enlarged heart, * slender muscular body, and claws make it the swiftest hunter * in Africa and the fastest animal on land. Can reach speeds * of up to 2.4GB per second. */ .globl U3copy_to_user U3copy_to_user: /* %o0=dst, %o1=src, %o2=len */ /* Writing to %asi is _expensive_ so we hardcode it. * Reading %asi to check for KERNEL_DS is comparatively * cheap. */ rd %asi, %g1 ! MS Group (4 cycles) cmp %g1, ASI_AIUS ! A0 Group bne U3memcpy ! BR nop ! A1 #ifndef __KERNEL__ /* Save away original 'dst' for memcpy return value. */ mov %o0, %g3 ! A0 Group #endif /* Anything to copy at all? */ cmp %o2, 0 ! A1 ble,pn %icc, U3copy_to_user_short_ret ! BR /* Extremely small copy? */ cmp %o2, 31 ! A0 Group ble,pn %icc, U3copy_to_user_short ! BR /* Large enough to use unrolled prefetch loops? */ cmp %o2, 0x100 ! A1 bge,a,pt %icc, U3copy_to_user_enter ! BR Group andcc %o0, 0x3f, %g2 ! A0 ba,pt %xcc, U3copy_to_user_toosmall ! BR Group andcc %o0, 0x7, %g2 ! A0 .align 32 U3copy_to_user_short: /* Copy %o2 bytes from src to dst, one byte at a time. */ ldub [%o1 + 0x00], %o3 ! MS Group add %o1, 0x1, %o1 ! A0 add %o0, 0x1, %o0 ! A1 subcc %o2, 1, %o2 ! A0 Group bg,pt %icc, U3copy_to_user_short ! BR EXNV(stba %o3, [%o0 + -1] %asi, add %o2, 1) ! MS Group (1-cycle stall) U3copy_to_user_short_ret: #ifdef __KERNEL__ retl ! BR Group (0-4 cycle stall) clr %o0 ! A0 #else retl ! BR Group (0-4 cycle stall) mov %g3, %o0 ! A0 #endif /* Here len >= (6 * 64) and condition codes reflect execution * of "andcc %o0, 0x7, %g2", done by caller. */ .align 64 U3copy_to_user_enter: /* Is 'dst' already aligned on an 64-byte boundary? */ be,pt %xcc, 2f ! BR /* Compute abs((dst & 0x3f) - 0x40) into %g2. This is the number * of bytes to copy to make 'dst' 64-byte aligned. We pre- * subtract this from 'len'. */ sub %g2, 0x40, %g2 ! A0 Group sub %g0, %g2, %g2 ! A0 Group sub %o2, %g2, %o2 ! A0 Group /* Copy %g2 bytes from src to dst, one byte at a time. */ 1: ldub [%o1 + 0x00], %o3 ! MS (Group) add %o1, 0x1, %o1 ! A1 add %o0, 0x1, %o0 ! A0 Group subcc %g2, 0x1, %g2 ! A1 bg,pt %icc, 1b ! BR Group EXNV2(stba %o3, [%o0 + -1] %asi, add %o2, %g2) ! MS Group 2: VISEntryHalf ! MS+MS and %o1, 0x7, %g1 ! A1 ba,pt %xcc, U3copy_to_user_begin ! BR alignaddr %o1, %g0, %o1 ! MS (Break-after) .align 64 U3copy_to_user_begin: prefetch [%o1 + 0x000], #one_read ! MS Group1 prefetch [%o1 + 0x040], #one_read ! MS Group2 andn %o2, (0x40 - 1), %o4 ! A0 prefetch [%o1 + 0x080], #one_read ! MS Group3 cmp %o4, 0x140 ! A0 prefetch [%o1 + 0x0c0], #one_read ! MS Group4 ldd [%o1 + 0x000], %f0 ! MS Group5 (%f0 results at G8) bge,a,pt %icc, 1f ! BR prefetch [%o1 + 0x100], #one_read ! MS Group6 1: ldd [%o1 + 0x008], %f2 ! AX (%f2 results at G9) cmp %o4, 0x180 ! A1 bge,a,pt %icc, 1f ! BR prefetch [%o1 + 0x140], #one_read ! MS Group7 1: ldd [%o1 + 0x010], %f4 ! AX (%f4 results at G10) cmp %o4, 0x1c0 ! A1 bge,a,pt %icc, 1f ! BR prefetch [%o1 + 0x180], #one_read ! MS Group8 1: faligndata %f0, %f2, %f16 ! FGA Group9 (%f16 at G12) ldd [%o1 + 0x018], %f6 ! AX (%f6 results at G12) faligndata %f2, %f4, %f18 ! FGA Group10 (%f18 results at G13) ldd [%o1 + 0x020], %f8 ! MS (%f8 results at G13) faligndata %f4, %f6, %f20 ! FGA Group12 (1-cycle stall,%f20 at G15) ldd [%o1 + 0x028], %f10 ! MS (%f10 results at G15) faligndata %f6, %f8, %f22 ! FGA Group13 (%f22 results at G16) ldd [%o1 + 0x030], %f12 ! MS (%f12 results at G16) faligndata %f8, %f10, %f24 ! FGA Group15 (1-cycle stall,%f24 at G18) ldd [%o1 + 0x038], %f14 ! MS (%f14 results at G18) faligndata %f10, %f12, %f26 ! FGA Group16 (%f26 results at G19) ldd [%o1 + 0x040], %f0 ! MS (%f0 results at G19) /* We only use the first loop if len > (7 * 64). */ subcc %o4, 0x1c0, %o4 ! A0 Group17 bg,pt %icc, U3copy_to_user_loop1 ! BR add %o1, 0x40, %o1 ! A1 add %o4, 0x140, %o4 ! A0 Group18 ba,pt %xcc, U3copy_to_user_loop2 ! BR srl %o4, 6, %o3 ! A0 Group19 nop nop nop nop nop nop nop /* This loop performs the copy and queues new prefetches. * We drop into the second loop when len <= (5 * 64). Note * that this (5 * 64) factor has been subtracted from len * already. */ U3copy_to_user_loop1: ldd [%o1 + 0x008], %f2 ! MS Group2 (%f2 results at G5) faligndata %f12, %f14, %f28 ! FGA (%f28 results at G5) ldd [%o1 + 0x010], %f4 ! MS Group3 (%f4 results at G6) faligndata %f14, %f0, %f30 ! FGA Group4 (1-cycle stall, %f30 at G7) EXBLK1(stda %f16, [%o0] ASI_BLK_AIUS) ! MS ldd [%o1 + 0x018], %f6 ! AX (%f6 results at G7) faligndata %f0, %f2, %f16 ! FGA Group12 (7-cycle stall) ldd [%o1 + 0x020], %f8 ! MS (%f8 results at G15) faligndata %f2, %f4, %f18 ! FGA Group13 (%f18 results at G16) ldd [%o1 + 0x028], %f10 ! MS (%f10 results at G16) faligndata %f4, %f6, %f20 ! FGA Group14 (%f20 results at G17) ldd [%o1 + 0x030], %f12 ! MS (%f12 results at G17) faligndata %f6, %f8, %f22 ! FGA Group15 (%f22 results at G18) ldd [%o1 + 0x038], %f14 ! MS (%f14 results at G18) faligndata %f8, %f10, %f24 ! FGA Group16 (%f24 results at G19) ldd [%o1 + 0x040], %f0 ! AX (%f0 results at G19) prefetch [%o1 + 0x180], #one_read ! MS faligndata %f10, %f12, %f26 ! FGA Group17 (%f26 results at G20) subcc %o4, 0x40, %o4 ! A0 add %o1, 0x40, %o1 ! A1 bg,pt %xcc, U3copy_to_user_loop1 ! BR add %o0, 0x40, %o0 ! A0 Group18 U3copy_to_user_loop2_enter: mov 5, %o3 ! A1 /* This loop performs on the copy, no new prefetches are * queued. We do things this way so that we do not perform * any spurious prefetches past the end of the src buffer. */ U3copy_to_user_loop2: ldd [%o1 + 0x008], %f2 ! MS faligndata %f12, %f14, %f28 ! FGA Group2 ldd [%o1 + 0x010], %f4 ! MS faligndata %f14, %f0, %f30 ! FGA Group4 (1-cycle stall) EXBLK2(stda %f16, [%o0] ASI_BLK_AIUS) ! MS ldd [%o1 + 0x018], %f6 ! AX faligndata %f0, %f2, %f16 ! FGA Group12 (7-cycle stall) ldd [%o1 + 0x020], %f8 ! MS faligndata %f2, %f4, %f18 ! FGA Group13 ldd [%o1 + 0x028], %f10 ! MS faligndata %f4, %f6, %f20 ! FGA Group14 ldd [%o1 + 0x030], %f12 ! MS faligndata %f6, %f8, %f22 ! FGA Group15 ldd [%o1 + 0x038], %f14 ! MS faligndata %f8, %f10, %f24 ! FGA Group16 ldd [%o1 + 0x040], %f0 ! AX faligndata %f10, %f12, %f26 ! FGA Group17 subcc %o3, 0x01, %o3 ! A0 add %o1, 0x40, %o1 ! A1 bg,pt %xcc, U3copy_to_user_loop2 ! BR add %o0, 0x40, %o0 ! A0 Group18 /* Finally we copy the last full 64-byte block. */ U3copy_to_user_loopfini: ldd [%o1 + 0x008], %f2 ! MS faligndata %f12, %f14, %f28 ! FGA ldd [%o1 + 0x010], %f4 ! MS Group19 faligndata %f14, %f0, %f30 ! FGA EXBLK3(stda %f16, [%o0] ASI_BLK_AIUS) ! MS Group20 ldd [%o1 + 0x018], %f6 ! AX faligndata %f0, %f2, %f16 ! FGA Group11 (7-cycle stall) ldd [%o1 + 0x020], %f8 ! MS faligndata %f2, %f4, %f18 ! FGA Group12 ldd [%o1 + 0x028], %f10 ! MS faligndata %f4, %f6, %f20 ! FGA Group13 ldd [%o1 + 0x030], %f12 ! MS faligndata %f6, %f8, %f22 ! FGA Group14 ldd [%o1 + 0x038], %f14 ! MS faligndata %f8, %f10, %f24 ! FGA Group15 cmp %g1, 0 ! A0 be,pt %icc, 1f ! BR add %o0, 0x40, %o0 ! A1 ldd [%o1 + 0x040], %f0 ! MS 1: faligndata %f10, %f12, %f26 ! FGA Group16 faligndata %f12, %f14, %f28 ! FGA Group17 faligndata %f14, %f0, %f30 ! FGA Group18 EXBLK4(stda %f16, [%o0] ASI_BLK_AIUS) ! MS add %o0, 0x40, %o0 ! A0 add %o1, 0x40, %o1 ! A1 membar #Sync ! MS Group26 (7-cycle stall) /* Now we copy the (len modulo 64) bytes at the end. * Note how we borrow the %f0 loaded above. * * Also notice how this code is careful not to perform a * load past the end of the src buffer just like similar * code found in U3copy_to_user_toosmall processing. */ U3copy_to_user_loopend: and %o2, 0x3f, %o2 ! A0 Group andcc %o2, 0x38, %g2 ! A0 Group be,pn %icc, U3copy_to_user_endcruft ! BR subcc %g2, 0x8, %g2 ! A1 be,pn %icc, U3copy_to_user_endcruft ! BR Group cmp %g1, 0 ! A0 be,a,pt %icc, 1f ! BR Group ldd [%o1 + 0x00], %f0 ! MS 1: ldd [%o1 + 0x08], %f2 ! MS Group add %o1, 0x8, %o1 ! A0 sub %o2, 0x8, %o2 ! A1 subcc %g2, 0x8, %g2 ! A0 Group faligndata %f0, %f2, %f8 ! FGA Group EX(stda %f8, [%o0 + 0x00] %asi, add %o2, 0x8) ! MS (XXX does it stall here? XXX) be,pn %icc, U3copy_to_user_endcruft ! BR add %o0, 0x8, %o0 ! A0 ldd [%o1 + 0x08], %f0 ! MS Group add %o1, 0x8, %o1 ! A0 sub %o2, 0x8, %o2 ! A1 subcc %g2, 0x8, %g2 ! A0 Group faligndata %f2, %f0, %f8 ! FGA EX(stda %f8, [%o0 + 0x00] %asi, add %o2, 0x8) ! MS (XXX does it stall here? XXX) bne,pn %icc, 1b ! BR add %o0, 0x8, %o0 ! A0 Group /* If anything is left, we copy it one byte at a time. * Note that %g1 is (src & 0x3) saved above before the * alignaddr was performed. */ U3copy_to_user_endcruft: cmp %o2, 0 add %o1, %g1, %o1 VISExitHalf be,pn %icc, U3copy_to_user_short_ret nop ba,a,pt %xcc, U3copy_to_user_short /* If we get here, then 32 <= len < (6 * 64) */ U3copy_to_user_toosmall: #ifdef SMALL_COPY_USES_FPU /* Is 'dst' already aligned on an 8-byte boundary? */ be,pt %xcc, 2f ! BR Group /* Compute abs((dst & 7) - 8) into %g2. This is the number * of bytes to copy to make 'dst' 8-byte aligned. We pre- * subtract this from 'len'. */ sub %g2, 0x8, %g2 ! A0 sub %g0, %g2, %g2 ! A0 Group (reg-dep) sub %o2, %g2, %o2 ! A0 Group (reg-dep) /* Copy %g2 bytes from src to dst, one byte at a time. */ 1: ldub [%o1 + 0x00], %o3 ! MS (Group) (%o3 in 3 cycles) add %o1, 0x1, %o1 ! A1 add %o0, 0x1, %o0 ! A0 Group subcc %g2, 0x1, %g2 ! A1 bg,pt %icc, 1b ! BR Group EXNV2(stba %o3, [%o0 + -1] %asi, add %o2, %g2) ! MS Group 2: VISEntryHalf ! MS+MS /* Compute (len - (len % 8)) into %g2. This is guarenteed * to be nonzero. */ andn %o2, 0x7, %g2 ! A0 Group /* You may read this and believe that it allows reading * one 8-byte longword past the end of src. It actually * does not, as %g2 is subtracted as loads are done from * src, so we always stop before running off the end. * Also, we are guarenteed to have at least 0x10 bytes * to move here. */ sub %g2, 0x8, %g2 ! A0 Group (reg-dep) alignaddr %o1, %g0, %g1 ! MS (Break-after) ldd [%g1 + 0x00], %f0 ! MS Group (1-cycle stall) add %g1, 0x8, %g1 ! A0 1: ldd [%g1 + 0x00], %f2 ! MS Group add %g1, 0x8, %g1 ! A0 sub %o2, 0x8, %o2 ! A1 subcc %g2, 0x8, %g2 ! A0 Group faligndata %f0, %f2, %f8 ! FGA Group (1-cycle stall) EX(stda %f8, [%o0 + 0x00] %asi, add %o2, 0x8) ! MS Group (2-cycle stall) add %o1, 0x8, %o1 ! A0 be,pn %icc, 2f ! BR add %o0, 0x8, %o0 ! A1 ldd [%g1 + 0x00], %f0 ! MS Group add %g1, 0x8, %g1 ! A0 sub %o2, 0x8, %o2 ! A1 subcc %g2, 0x8, %g2 ! A0 Group faligndata %f2, %f0, %f8 ! FGA Group (1-cycle stall) EX(stda %f8, [%o0 + 0x00] %asi, add %o2, 0x8) ! MS Group (2-cycle stall) add %o1, 0x8, %o1 ! A0 bne,pn %icc, 1b ! BR add %o0, 0x8, %o0 ! A1 /* Nothing left to copy? */ 2: cmp %o2, 0 ! A0 Group VISExitHalf ! A0+MS be,pn %icc, U3copy_to_user_short_ret ! BR Group nop ! A0 ba,a,pt %xcc, U3copy_to_user_short ! BR Group #else /* !(SMALL_COPY_USES_FPU) */ xor %o1, %o0, %g2 andcc %g2, 0x7, %g0 bne,pn %icc, U3copy_to_user_short andcc %o1, 0x7, %g2 be,pt %xcc, 2f sub %g2, 0x8, %g2 sub %g0, %g2, %g2 sub %o2, %g2, %o2 1: ldub [%o1 + 0x00], %o3 add %o1, 0x1, %o1 add %o0, 0x1, %o0 subcc %g2, 0x1, %g2 bg,pt %icc, 1b EXNV2(stba %o3, [%o0 + -1] %asi, add %o2, %g2) 2: andn %o2, 0x7, %g2 sub %o2, %g2, %o2 3: ldx [%o1 + 0x00], %o3 add %o1, 0x8, %o1 add %o0, 0x8, %o0 subcc %g2, 0x8, %g2 bg,pt %icc, 3b EXNV3(stxa %o3, [%o0 + -8] %asi, add %o2, %g2) cmp %o2, 0 bne,pn %icc, U3copy_to_user_short nop ba,a,pt %xcc, U3copy_to_user_short_ret #endif /* !(SMALL_COPY_USES_FPU) */ |