1 // SPDX-License-Identifier: GPL-2.0 1 // SPDX-License-Identifier: GPL-2.0
2 /* 2 /*
3 * Copyright (C) 2020-2022 Loongson Technology !! 3 * Alpha IO and memory functions.
4 */ 4 */
5 #include <linux/export.h> !! 5
>> 6 #include <linux/kernel.h>
6 #include <linux/types.h> 7 #include <linux/types.h>
7 #include <linux/io.h> !! 8 #include <linux/string.h>
>> 9 #include <linux/module.h>
>> 10 #include <asm/io.h>
>> 11
>> 12 /* Out-of-line versions of the i/o routines that redirect into the
>> 13 platform-specific version. Note that "platform-specific" may mean
>> 14 "generic", which bumps through the machine vector. */
>> 15
>> 16 unsigned int
>> 17 ioread8(const void __iomem *addr)
>> 18 {
>> 19 unsigned int ret;
>> 20 mb();
>> 21 ret = IO_CONCAT(__IO_PREFIX,ioread8)(addr);
>> 22 mb();
>> 23 return ret;
>> 24 }
>> 25
>> 26 unsigned int ioread16(const void __iomem *addr)
>> 27 {
>> 28 unsigned int ret;
>> 29 mb();
>> 30 ret = IO_CONCAT(__IO_PREFIX,ioread16)(addr);
>> 31 mb();
>> 32 return ret;
>> 33 }
>> 34
>> 35 unsigned int ioread32(const void __iomem *addr)
>> 36 {
>> 37 unsigned int ret;
>> 38 mb();
>> 39 ret = IO_CONCAT(__IO_PREFIX,ioread32)(addr);
>> 40 mb();
>> 41 return ret;
>> 42 }
>> 43
>> 44 u64 ioread64(const void __iomem *addr)
>> 45 {
>> 46 unsigned int ret;
>> 47 mb();
>> 48 ret = IO_CONCAT(__IO_PREFIX,ioread64)(addr);
>> 49 mb();
>> 50 return ret;
>> 51 }
>> 52
>> 53 void iowrite8(u8 b, void __iomem *addr)
>> 54 {
>> 55 mb();
>> 56 IO_CONCAT(__IO_PREFIX,iowrite8)(b, addr);
>> 57 }
>> 58
>> 59 void iowrite16(u16 b, void __iomem *addr)
>> 60 {
>> 61 mb();
>> 62 IO_CONCAT(__IO_PREFIX,iowrite16)(b, addr);
>> 63 }
>> 64
>> 65 void iowrite32(u32 b, void __iomem *addr)
>> 66 {
>> 67 mb();
>> 68 IO_CONCAT(__IO_PREFIX,iowrite32)(b, addr);
>> 69 }
>> 70
>> 71 void iowrite64(u64 b, void __iomem *addr)
>> 72 {
>> 73 mb();
>> 74 IO_CONCAT(__IO_PREFIX,iowrite64)(b, addr);
>> 75 }
>> 76
>> 77 EXPORT_SYMBOL(ioread8);
>> 78 EXPORT_SYMBOL(ioread16);
>> 79 EXPORT_SYMBOL(ioread32);
>> 80 EXPORT_SYMBOL(ioread64);
>> 81 EXPORT_SYMBOL(iowrite8);
>> 82 EXPORT_SYMBOL(iowrite16);
>> 83 EXPORT_SYMBOL(iowrite32);
>> 84 EXPORT_SYMBOL(iowrite64);
>> 85
>> 86 u8 inb(unsigned long port)
>> 87 {
>> 88 return ioread8(ioport_map(port, 1));
>> 89 }
>> 90
>> 91 u16 inw(unsigned long port)
>> 92 {
>> 93 return ioread16(ioport_map(port, 2));
>> 94 }
>> 95
>> 96 u32 inl(unsigned long port)
>> 97 {
>> 98 return ioread32(ioport_map(port, 4));
>> 99 }
>> 100
>> 101 void outb(u8 b, unsigned long port)
>> 102 {
>> 103 iowrite8(b, ioport_map(port, 1));
>> 104 }
>> 105
>> 106 void outw(u16 b, unsigned long port)
>> 107 {
>> 108 iowrite16(b, ioport_map(port, 2));
>> 109 }
>> 110
>> 111 void outl(u32 b, unsigned long port)
>> 112 {
>> 113 iowrite32(b, ioport_map(port, 4));
>> 114 }
>> 115
>> 116 EXPORT_SYMBOL(inb);
>> 117 EXPORT_SYMBOL(inw);
>> 118 EXPORT_SYMBOL(inl);
>> 119 EXPORT_SYMBOL(outb);
>> 120 EXPORT_SYMBOL(outw);
>> 121 EXPORT_SYMBOL(outl);
>> 122
>> 123 u8 __raw_readb(const volatile void __iomem *addr)
>> 124 {
>> 125 return IO_CONCAT(__IO_PREFIX,readb)(addr);
>> 126 }
>> 127
>> 128 u16 __raw_readw(const volatile void __iomem *addr)
>> 129 {
>> 130 return IO_CONCAT(__IO_PREFIX,readw)(addr);
>> 131 }
>> 132
>> 133 u32 __raw_readl(const volatile void __iomem *addr)
>> 134 {
>> 135 return IO_CONCAT(__IO_PREFIX,readl)(addr);
>> 136 }
>> 137
>> 138 u64 __raw_readq(const volatile void __iomem *addr)
>> 139 {
>> 140 return IO_CONCAT(__IO_PREFIX,readq)(addr);
>> 141 }
>> 142
>> 143 void __raw_writeb(u8 b, volatile void __iomem *addr)
>> 144 {
>> 145 IO_CONCAT(__IO_PREFIX,writeb)(b, addr);
>> 146 }
>> 147
>> 148 void __raw_writew(u16 b, volatile void __iomem *addr)
>> 149 {
>> 150 IO_CONCAT(__IO_PREFIX,writew)(b, addr);
>> 151 }
>> 152
>> 153 void __raw_writel(u32 b, volatile void __iomem *addr)
>> 154 {
>> 155 IO_CONCAT(__IO_PREFIX,writel)(b, addr);
>> 156 }
>> 157
>> 158 void __raw_writeq(u64 b, volatile void __iomem *addr)
>> 159 {
>> 160 IO_CONCAT(__IO_PREFIX,writeq)(b, addr);
>> 161 }
>> 162
>> 163 EXPORT_SYMBOL(__raw_readb);
>> 164 EXPORT_SYMBOL(__raw_readw);
>> 165 EXPORT_SYMBOL(__raw_readl);
>> 166 EXPORT_SYMBOL(__raw_readq);
>> 167 EXPORT_SYMBOL(__raw_writeb);
>> 168 EXPORT_SYMBOL(__raw_writew);
>> 169 EXPORT_SYMBOL(__raw_writel);
>> 170 EXPORT_SYMBOL(__raw_writeq);
>> 171
>> 172 u8 readb(const volatile void __iomem *addr)
>> 173 {
>> 174 u8 ret;
>> 175 mb();
>> 176 ret = __raw_readb(addr);
>> 177 mb();
>> 178 return ret;
>> 179 }
>> 180
>> 181 u16 readw(const volatile void __iomem *addr)
>> 182 {
>> 183 u16 ret;
>> 184 mb();
>> 185 ret = __raw_readw(addr);
>> 186 mb();
>> 187 return ret;
>> 188 }
>> 189
>> 190 u32 readl(const volatile void __iomem *addr)
>> 191 {
>> 192 u32 ret;
>> 193 mb();
>> 194 ret = __raw_readl(addr);
>> 195 mb();
>> 196 return ret;
>> 197 }
>> 198
>> 199 u64 readq(const volatile void __iomem *addr)
>> 200 {
>> 201 u64 ret;
>> 202 mb();
>> 203 ret = __raw_readq(addr);
>> 204 mb();
>> 205 return ret;
>> 206 }
>> 207
>> 208 void writeb(u8 b, volatile void __iomem *addr)
>> 209 {
>> 210 mb();
>> 211 __raw_writeb(b, addr);
>> 212 }
>> 213
>> 214 void writew(u16 b, volatile void __iomem *addr)
>> 215 {
>> 216 mb();
>> 217 __raw_writew(b, addr);
>> 218 }
>> 219
>> 220 void writel(u32 b, volatile void __iomem *addr)
>> 221 {
>> 222 mb();
>> 223 __raw_writel(b, addr);
>> 224 }
>> 225
>> 226 void writeq(u64 b, volatile void __iomem *addr)
>> 227 {
>> 228 mb();
>> 229 __raw_writeq(b, addr);
>> 230 }
>> 231
>> 232 EXPORT_SYMBOL(readb);
>> 233 EXPORT_SYMBOL(readw);
>> 234 EXPORT_SYMBOL(readl);
>> 235 EXPORT_SYMBOL(readq);
>> 236 EXPORT_SYMBOL(writeb);
>> 237 EXPORT_SYMBOL(writew);
>> 238 EXPORT_SYMBOL(writel);
>> 239 EXPORT_SYMBOL(writeq);
8 240
9 /* 241 /*
10 * Copy data from IO memory space to "real" me !! 242 * The _relaxed functions must be ordered w.r.t. each other, but they don't
>> 243 * have to be ordered w.r.t. other memory accesses.
11 */ 244 */
12 void __memcpy_fromio(void *to, const volatile !! 245 u8 readb_relaxed(const volatile void __iomem *addr)
13 { 246 {
14 while (count && !IS_ALIGNED((unsigned !! 247 mb();
15 *(u8 *)to = __raw_readb(from); !! 248 return __raw_readb(addr);
16 from++; !! 249 }
17 to++; !! 250
>> 251 u16 readw_relaxed(const volatile void __iomem *addr)
>> 252 {
>> 253 mb();
>> 254 return __raw_readw(addr);
>> 255 }
>> 256
>> 257 u32 readl_relaxed(const volatile void __iomem *addr)
>> 258 {
>> 259 mb();
>> 260 return __raw_readl(addr);
>> 261 }
>> 262
>> 263 u64 readq_relaxed(const volatile void __iomem *addr)
>> 264 {
>> 265 mb();
>> 266 return __raw_readq(addr);
>> 267 }
>> 268
>> 269 EXPORT_SYMBOL(readb_relaxed);
>> 270 EXPORT_SYMBOL(readw_relaxed);
>> 271 EXPORT_SYMBOL(readl_relaxed);
>> 272 EXPORT_SYMBOL(readq_relaxed);
>> 273
>> 274 /*
>> 275 * Read COUNT 8-bit bytes from port PORT into memory starting at SRC.
>> 276 */
>> 277 void ioread8_rep(const void __iomem *port, void *dst, unsigned long count)
>> 278 {
>> 279 while ((unsigned long)dst & 0x3) {
>> 280 if (!count)
>> 281 return;
18 count--; 282 count--;
>> 283 *(unsigned char *)dst = ioread8(port);
>> 284 dst += 1;
19 } 285 }
20 286
21 while (count >= 8) { !! 287 while (count >= 4) {
22 *(u64 *)to = __raw_readq(from) !! 288 unsigned int w;
23 from += 8; !! 289 count -= 4;
24 to += 8; !! 290 w = ioread8(port);
25 count -= 8; !! 291 w |= ioread8(port) << 8;
>> 292 w |= ioread8(port) << 16;
>> 293 w |= ioread8(port) << 24;
>> 294 *(unsigned int *)dst = w;
>> 295 dst += 4;
26 } 296 }
27 297
28 while (count) { 298 while (count) {
29 *(u8 *)to = __raw_readb(from); !! 299 --count;
30 from++; !! 300 *(unsigned char *)dst = ioread8(port);
31 to++; !! 301 dst += 1;
32 count--; <<
33 } 302 }
34 } 303 }
35 EXPORT_SYMBOL(__memcpy_fromio); !! 304
>> 305 void insb(unsigned long port, void *dst, unsigned long count)
>> 306 {
>> 307 ioread8_rep(ioport_map(port, 1), dst, count);
>> 308 }
>> 309
>> 310 EXPORT_SYMBOL(ioread8_rep);
>> 311 EXPORT_SYMBOL(insb);
36 312
37 /* 313 /*
38 * Copy data from "real" memory space to IO me !! 314 * Read COUNT 16-bit words from port PORT into memory starting at
>> 315 * SRC. SRC must be at least short aligned. This is used by the
>> 316 * IDE driver to read disk sectors. Performance is important, but
>> 317 * the interfaces seems to be slow: just using the inlined version
>> 318 * of the inw() breaks things.
39 */ 319 */
40 void __memcpy_toio(volatile void __iomem *to, !! 320 void ioread16_rep(const void __iomem *port, void *dst, unsigned long count)
41 { 321 {
42 while (count && !IS_ALIGNED((unsigned !! 322 if (unlikely((unsigned long)dst & 0x3)) {
43 __raw_writeb(*(u8 *)from, to); !! 323 if (!count)
44 from++; !! 324 return;
45 to++; !! 325 BUG_ON((unsigned long)dst & 0x1);
46 count--; 326 count--;
>> 327 *(unsigned short *)dst = ioread16(port);
>> 328 dst += 2;
47 } 329 }
48 330
49 while (count >= 8) { !! 331 while (count >= 2) {
50 __raw_writeq(*(u64 *)from, to) !! 332 unsigned int w;
51 from += 8; !! 333 count -= 2;
52 to += 8; !! 334 w = ioread16(port);
>> 335 w |= ioread16(port) << 16;
>> 336 *(unsigned int *)dst = w;
>> 337 dst += 4;
>> 338 }
>> 339
>> 340 if (count) {
>> 341 *(unsigned short*)dst = ioread16(port);
>> 342 }
>> 343 }
>> 344
>> 345 void insw(unsigned long port, void *dst, unsigned long count)
>> 346 {
>> 347 ioread16_rep(ioport_map(port, 2), dst, count);
>> 348 }
>> 349
>> 350 EXPORT_SYMBOL(ioread16_rep);
>> 351 EXPORT_SYMBOL(insw);
>> 352
>> 353
>> 354 /*
>> 355 * Read COUNT 32-bit words from port PORT into memory starting at
>> 356 * SRC. Now works with any alignment in SRC. Performance is important,
>> 357 * but the interfaces seems to be slow: just using the inlined version
>> 358 * of the inl() breaks things.
>> 359 */
>> 360 void ioread32_rep(const void __iomem *port, void *dst, unsigned long count)
>> 361 {
>> 362 if (unlikely((unsigned long)dst & 0x3)) {
>> 363 while (count--) {
>> 364 struct S { int x __attribute__((packed)); };
>> 365 ((struct S *)dst)->x = ioread32(port);
>> 366 dst += 4;
>> 367 }
>> 368 } else {
>> 369 /* Buffer 32-bit aligned. */
>> 370 while (count--) {
>> 371 *(unsigned int *)dst = ioread32(port);
>> 372 dst += 4;
>> 373 }
>> 374 }
>> 375 }
>> 376
>> 377 void insl(unsigned long port, void *dst, unsigned long count)
>> 378 {
>> 379 ioread32_rep(ioport_map(port, 4), dst, count);
>> 380 }
>> 381
>> 382 EXPORT_SYMBOL(ioread32_rep);
>> 383 EXPORT_SYMBOL(insl);
>> 384
>> 385
>> 386 /*
>> 387 * Like insb but in the opposite direction.
>> 388 * Don't worry as much about doing aligned memory transfers:
>> 389 * doing byte reads the "slow" way isn't nearly as slow as
>> 390 * doing byte writes the slow way (no r-m-w cycle).
>> 391 */
>> 392 void iowrite8_rep(void __iomem *port, const void *xsrc, unsigned long count)
>> 393 {
>> 394 const unsigned char *src = xsrc;
>> 395 while (count--)
>> 396 iowrite8(*src++, port);
>> 397 }
>> 398
>> 399 void outsb(unsigned long port, const void *src, unsigned long count)
>> 400 {
>> 401 iowrite8_rep(ioport_map(port, 1), src, count);
>> 402 }
>> 403
>> 404 EXPORT_SYMBOL(iowrite8_rep);
>> 405 EXPORT_SYMBOL(outsb);
>> 406
>> 407
>> 408 /*
>> 409 * Like insw but in the opposite direction. This is used by the IDE
>> 410 * driver to write disk sectors. Performance is important, but the
>> 411 * interfaces seems to be slow: just using the inlined version of the
>> 412 * outw() breaks things.
>> 413 */
>> 414 void iowrite16_rep(void __iomem *port, const void *src, unsigned long count)
>> 415 {
>> 416 if (unlikely((unsigned long)src & 0x3)) {
>> 417 if (!count)
>> 418 return;
>> 419 BUG_ON((unsigned long)src & 0x1);
>> 420 iowrite16(*(unsigned short *)src, port);
>> 421 src += 2;
>> 422 --count;
>> 423 }
>> 424
>> 425 while (count >= 2) {
>> 426 unsigned int w;
>> 427 count -= 2;
>> 428 w = *(unsigned int *)src;
>> 429 src += 4;
>> 430 iowrite16(w >> 0, port);
>> 431 iowrite16(w >> 16, port);
>> 432 }
>> 433
>> 434 if (count) {
>> 435 iowrite16(*(unsigned short *)src, port);
>> 436 }
>> 437 }
>> 438
>> 439 void outsw(unsigned long port, const void *src, unsigned long count)
>> 440 {
>> 441 iowrite16_rep(ioport_map(port, 2), src, count);
>> 442 }
>> 443
>> 444 EXPORT_SYMBOL(iowrite16_rep);
>> 445 EXPORT_SYMBOL(outsw);
>> 446
>> 447
>> 448 /*
>> 449 * Like insl but in the opposite direction. This is used by the IDE
>> 450 * driver to write disk sectors. Works with any alignment in SRC.
>> 451 * Performance is important, but the interfaces seems to be slow:
>> 452 * just using the inlined version of the outl() breaks things.
>> 453 */
>> 454 void iowrite32_rep(void __iomem *port, const void *src, unsigned long count)
>> 455 {
>> 456 if (unlikely((unsigned long)src & 0x3)) {
>> 457 while (count--) {
>> 458 struct S { int x __attribute__((packed)); };
>> 459 iowrite32(((struct S *)src)->x, port);
>> 460 src += 4;
>> 461 }
>> 462 } else {
>> 463 /* Buffer 32-bit aligned. */
>> 464 while (count--) {
>> 465 iowrite32(*(unsigned int *)src, port);
>> 466 src += 4;
>> 467 }
>> 468 }
>> 469 }
>> 470
>> 471 void outsl(unsigned long port, const void *src, unsigned long count)
>> 472 {
>> 473 iowrite32_rep(ioport_map(port, 4), src, count);
>> 474 }
>> 475
>> 476 EXPORT_SYMBOL(iowrite32_rep);
>> 477 EXPORT_SYMBOL(outsl);
>> 478
>> 479
>> 480 /*
>> 481 * Copy data from IO memory space to "real" memory space.
>> 482 * This needs to be optimized.
>> 483 */
>> 484 void memcpy_fromio(void *to, const volatile void __iomem *from, long count)
>> 485 {
>> 486 /* Optimize co-aligned transfers. Everything else gets handled
>> 487 a byte at a time. */
>> 488
>> 489 if (count >= 8 && ((u64)to & 7) == ((u64)from & 7)) {
53 count -= 8; 490 count -= 8;
>> 491 do {
>> 492 *(u64 *)to = __raw_readq(from);
>> 493 count -= 8;
>> 494 to += 8;
>> 495 from += 8;
>> 496 } while (count >= 0);
>> 497 count += 8;
54 } 498 }
55 499
56 while (count) { !! 500 if (count >= 4 && ((u64)to & 3) == ((u64)from & 3)) {
57 __raw_writeb(*(u8 *)from, to); !! 501 count -= 4;
58 from++; !! 502 do {
>> 503 *(u32 *)to = __raw_readl(from);
>> 504 count -= 4;
>> 505 to += 4;
>> 506 from += 4;
>> 507 } while (count >= 0);
>> 508 count += 4;
>> 509 }
>> 510
>> 511 if (count >= 2 && ((u64)to & 1) == ((u64)from & 1)) {
>> 512 count -= 2;
>> 513 do {
>> 514 *(u16 *)to = __raw_readw(from);
>> 515 count -= 2;
>> 516 to += 2;
>> 517 from += 2;
>> 518 } while (count >= 0);
>> 519 count += 2;
>> 520 }
>> 521
>> 522 while (count > 0) {
>> 523 *(u8 *) to = __raw_readb(from);
>> 524 count--;
59 to++; 525 to++;
>> 526 from++;
>> 527 }
>> 528 mb();
>> 529 }
>> 530
>> 531 EXPORT_SYMBOL(memcpy_fromio);
>> 532
>> 533
>> 534 /*
>> 535 * Copy data from "real" memory space to IO memory space.
>> 536 * This needs to be optimized.
>> 537 */
>> 538 void memcpy_toio(volatile void __iomem *to, const void *from, long count)
>> 539 {
>> 540 /* Optimize co-aligned transfers. Everything else gets handled
>> 541 a byte at a time. */
>> 542 /* FIXME -- align FROM. */
>> 543
>> 544 if (count >= 8 && ((u64)to & 7) == ((u64)from & 7)) {
>> 545 count -= 8;
>> 546 do {
>> 547 __raw_writeq(*(const u64 *)from, to);
>> 548 count -= 8;
>> 549 to += 8;
>> 550 from += 8;
>> 551 } while (count >= 0);
>> 552 count += 8;
>> 553 }
>> 554
>> 555 if (count >= 4 && ((u64)to & 3) == ((u64)from & 3)) {
>> 556 count -= 4;
>> 557 do {
>> 558 __raw_writel(*(const u32 *)from, to);
>> 559 count -= 4;
>> 560 to += 4;
>> 561 from += 4;
>> 562 } while (count >= 0);
>> 563 count += 4;
>> 564 }
>> 565
>> 566 if (count >= 2 && ((u64)to & 1) == ((u64)from & 1)) {
>> 567 count -= 2;
>> 568 do {
>> 569 __raw_writew(*(const u16 *)from, to);
>> 570 count -= 2;
>> 571 to += 2;
>> 572 from += 2;
>> 573 } while (count >= 0);
>> 574 count += 2;
>> 575 }
>> 576
>> 577 while (count > 0) {
>> 578 __raw_writeb(*(const u8 *) from, to);
60 count--; 579 count--;
>> 580 to++;
>> 581 from++;
61 } 582 }
>> 583 mb();
62 } 584 }
63 EXPORT_SYMBOL(__memcpy_toio); !! 585
>> 586 EXPORT_SYMBOL(memcpy_toio);
>> 587
64 588
65 /* 589 /*
66 * "memset" on IO memory space. 590 * "memset" on IO memory space.
67 */ 591 */
68 void __memset_io(volatile void __iomem *dst, i !! 592 void _memset_c_io(volatile void __iomem *to, unsigned long c, long count)
69 { 593 {
70 u64 qc = (u8)c; !! 594 /* Handle any initial odd byte */
>> 595 if (count > 0 && ((u64)to & 1)) {
>> 596 __raw_writeb(c, to);
>> 597 to++;
>> 598 count--;
>> 599 }
71 600
72 qc |= qc << 8; !! 601 /* Handle any initial odd halfword */
73 qc |= qc << 16; !! 602 if (count >= 2 && ((u64)to & 2)) {
74 qc |= qc << 32; !! 603 __raw_writew(c, to);
>> 604 to += 2;
>> 605 count -= 2;
>> 606 }
75 607
76 while (count && !IS_ALIGNED((unsigned !! 608 /* Handle any initial odd word */
77 __raw_writeb(c, dst); !! 609 if (count >= 4 && ((u64)to & 4)) {
78 dst++; !! 610 __raw_writel(c, to);
79 count--; !! 611 to += 4;
>> 612 count -= 4;
80 } 613 }
81 614
82 while (count >= 8) { !! 615 /* Handle all full-sized quadwords: we're aligned
83 __raw_writeq(qc, dst); !! 616 (or have a small count) */
84 dst += 8; !! 617 count -= 8;
85 count -= 8; !! 618 if (count >= 0) {
>> 619 do {
>> 620 __raw_writeq(c, to);
>> 621 to += 8;
>> 622 count -= 8;
>> 623 } while (count >= 0);
86 } 624 }
>> 625 count += 8;
87 626
88 while (count) { !! 627 /* The tail is word-aligned if we still have count >= 4 */
89 __raw_writeb(c, dst); !! 628 if (count >= 4) {
90 dst++; !! 629 __raw_writel(c, to);
91 count--; !! 630 to += 4;
>> 631 count -= 4;
>> 632 }
>> 633
>> 634 /* The tail is half-word aligned if we have count >= 2 */
>> 635 if (count >= 2) {
>> 636 __raw_writew(c, to);
>> 637 to += 2;
>> 638 count -= 2;
>> 639 }
>> 640
>> 641 /* And finally, one last byte.. */
>> 642 if (count) {
>> 643 __raw_writeb(c, to);
>> 644 }
>> 645 mb();
>> 646 }
>> 647
>> 648 EXPORT_SYMBOL(_memset_c_io);
>> 649
>> 650 #if IS_ENABLED(CONFIG_VGA_CONSOLE) || IS_ENABLED(CONFIG_MDA_CONSOLE)
>> 651
>> 652 #include <asm/vga.h>
>> 653
>> 654 /* A version of memcpy used by the vga console routines to move data around
>> 655 arbitrarily between screen and main memory. */
>> 656
>> 657 void
>> 658 scr_memcpyw(u16 *d, const u16 *s, unsigned int count)
>> 659 {
>> 660 const u16 __iomem *ios = (const u16 __iomem *) s;
>> 661 u16 __iomem *iod = (u16 __iomem *) d;
>> 662 int s_isio = __is_ioaddr(s);
>> 663 int d_isio = __is_ioaddr(d);
>> 664
>> 665 if (s_isio) {
>> 666 if (d_isio) {
>> 667 /* FIXME: Should handle unaligned ops and
>> 668 operation widening. */
>> 669
>> 670 count /= 2;
>> 671 while (count--) {
>> 672 u16 tmp = __raw_readw(ios++);
>> 673 __raw_writew(tmp, iod++);
>> 674 }
>> 675 }
>> 676 else
>> 677 memcpy_fromio(d, ios, count);
>> 678 } else {
>> 679 if (d_isio)
>> 680 memcpy_toio(iod, s, count);
>> 681 else
>> 682 memcpy(d, s, count);
>> 683 }
>> 684 }
>> 685
>> 686 EXPORT_SYMBOL(scr_memcpyw);
>> 687
>> 688 void scr_memmovew(u16 *d, const u16 *s, unsigned int count)
>> 689 {
>> 690 if (d < s)
>> 691 scr_memcpyw(d, s, count);
>> 692 else {
>> 693 count /= 2;
>> 694 d += count;
>> 695 s += count;
>> 696 while (count--)
>> 697 scr_writew(scr_readw(--s), --d);
92 } 698 }
93 } 699 }
94 EXPORT_SYMBOL(__memset_io); !! 700 EXPORT_SYMBOL(scr_memmovew);
>> 701 #endif
>> 702
>> 703 void __iomem *ioport_map(unsigned long port, unsigned int size)
>> 704 {
>> 705 return IO_CONCAT(__IO_PREFIX,ioportmap) (port);
>> 706 }
>> 707
>> 708 void ioport_unmap(void __iomem *addr)
>> 709 {
>> 710 }
>> 711
>> 712 EXPORT_SYMBOL(ioport_map);
>> 713 EXPORT_SYMBOL(ioport_unmap);
95 714
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