1 /* $OpenBSD: biosdev.c,v 1.92 2015/10/01 20:28:12 krw Exp $ */ 2 3 /* 4 * Copyright (c) 1996 Michael Shalayeff 5 * Copyright (c) 2003 Tobias Weingartner 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 */ 30 31 #include <sys/param.h> 32 #include <sys/reboot.h> 33 #include <sys/disklabel.h> 34 #include <isofs/cd9660/iso.h> 35 #include <lib/libsa/saerrno.h> 36 #include <machine/biosvar.h> 37 #include <machine/tss.h> 38 39 #include "biosdev.h" 40 #include "debug.h" 41 #include "disk.h" 42 #include "libsa.h" 43 44 #ifdef SOFTRAID 45 #include <dev/softraidvar.h> 46 #include "softraid.h" 47 #endif 48 49 static const char *biosdisk_err(u_int); 50 static int biosdisk_errno(u_int); 51 52 int CHS_rw (int, int, int, int, int, int, void *); 53 static int EDD_rw (int, int, u_int32_t, u_int32_t, void *); 54 55 static int biosd_io(int, bios_diskinfo_t *, u_int, int, void *); 56 static u_int findopenbsd(bios_diskinfo_t *, const char **); 57 58 extern int debug; 59 int bios_bootdev; 60 int bios_cddev = -1; /* Set by srt0 if coming from CD */ 61 62 struct EDD_CB { 63 u_int8_t edd_len; /* size of packet */ 64 u_int8_t edd_res1; /* reserved */ 65 u_int8_t edd_nblk; /* # of blocks to transfer */ 66 u_int8_t edd_res2; /* reserved */ 67 u_int16_t edd_off; /* address of buffer (offset) */ 68 u_int16_t edd_seg; /* address of buffer (segment) */ 69 u_int64_t edd_daddr; /* starting block */ 70 }; 71 72 /* 73 * reset disk system 74 */ 75 static int 76 biosdreset(int dev) 77 { 78 int rv; 79 80 __asm volatile (DOINT(0x13) "; setc %b0" : "=a" (rv) 81 : "0" (0), "d" (dev) : "%ecx", "cc"); 82 83 return ((rv & 0xff)? rv >> 8 : 0); 84 } 85 86 /* 87 * Fill out a bios_diskinfo_t for this device. 88 * Return 0 if all ok. 89 * Return 1 if not ok. 90 */ 91 int 92 bios_getdiskinfo(int dev, bios_diskinfo_t *pdi) 93 { 94 u_int rv; 95 96 /* Just reset, don't check return code */ 97 rv = biosdreset(dev); 98 99 #ifdef BIOS_DEBUG 100 if (debug) 101 printf("getinfo: try #8, 0x%x, %p\n", dev, pdi); 102 #endif 103 __asm volatile (DOINT(0x13) "\n\t" 104 "setc %b0; movzbl %h1, %1\n\t" 105 "movzbl %%cl, %3; andb $0x3f, %b3\n\t" 106 "xchgb %%cl, %%ch; rolb $2, %%ch" 107 : "=a" (rv), "=d" (pdi->bios_heads), 108 "=c" (pdi->bios_cylinders), 109 "=b" (pdi->bios_sectors) 110 : "0" (0x0800), "1" (dev) : "cc"); 111 112 #ifdef BIOS_DEBUG 113 if (debug) { 114 printf("getinfo: got #8\n"); 115 printf("disk 0x%x: %d,%d,%d\n", dev, pdi->bios_cylinders, 116 pdi->bios_heads, pdi->bios_sectors); 117 } 118 #endif 119 if (rv & 0xff) 120 return 1; 121 122 /* Fix up info */ 123 pdi->bios_number = dev; 124 pdi->bios_heads++; 125 pdi->bios_cylinders &= 0x3ff; 126 pdi->bios_cylinders++; 127 128 /* NOTE: 129 * This currently hangs/reboots some machines 130 * The IBM ThinkPad 750ED for one. 131 * 132 * Funny that an IBM/MS extension would not be 133 * implemented by an IBM system... 134 * 135 * Future hangs (when reported) can be "fixed" 136 * with getSYSCONFaddr() and an exceptions list. 137 */ 138 if (dev & 0x80 && (dev == 0x80 || dev == 0x81 || dev == bios_bootdev)) { 139 int bm; 140 141 #ifdef BIOS_DEBUG 142 if (debug) 143 printf("getinfo: try #41, 0x%x\n", dev); 144 #endif 145 /* EDD support check */ 146 __asm volatile(DOINT(0x13) "; setc %b0" 147 : "=a" (rv), "=c" (bm) 148 : "0" (0x4100), "b" (0x55aa), "d" (dev) : "cc"); 149 if (!(rv & 0xff) && (BIOS_regs.biosr_bx & 0xffff) == 0xaa55) 150 pdi->bios_edd = (bm & 0xffff) | ((rv & 0xff) << 16); 151 else 152 pdi->bios_edd = -1; 153 154 #ifdef BIOS_DEBUG 155 if (debug) { 156 printf("getinfo: got #41\n"); 157 printf("disk 0x%x: 0x%x\n", dev, bm); 158 } 159 #endif 160 /* 161 * If extended disk access functions are not supported 162 * there is not much point on doing EDD. 163 */ 164 if (!(pdi->bios_edd & EXT_BM_EDA)) 165 pdi->bios_edd = -1; 166 } else 167 pdi->bios_edd = -1; 168 169 /* Skip sanity check for CHS options in EDD mode. */ 170 if (pdi->bios_edd != -1) 171 return 0; 172 173 /* Sanity check */ 174 if (!pdi->bios_cylinders || !pdi->bios_heads || !pdi->bios_sectors) 175 return 1; 176 177 /* CD-ROMs sometimes return heads == 1 */ 178 if (pdi->bios_heads < 2) 179 return 1; 180 181 return 0; 182 } 183 184 /* 185 * Read/Write a block from given place using the BIOS. 186 */ 187 int 188 CHS_rw(int rw, int dev, int cyl, int head, int sect, int nsect, void *buf) 189 { 190 int rv; 191 192 rw = rw == F_READ ? 2 : 3; 193 BIOS_regs.biosr_es = (u_int32_t)buf >> 4; 194 __asm volatile ("movb %b7, %h1\n\t" 195 "movb %b6, %%dh\n\t" 196 "andl $0xf, %4\n\t" 197 /* cylinder; the highest 2 bits of cyl is in %cl */ 198 "xchgb %%ch, %%cl\n\t" 199 "rorb $2, %%cl\n\t" 200 "orb %b5, %%cl\n\t" 201 "inc %%cx\n\t" 202 DOINT(0x13) "\n\t" 203 "setc %b0" 204 : "=a" (rv) 205 : "0" (nsect), "d" (dev), "c" (cyl), 206 "b" (buf), "m" (sect), "m" (head), 207 "m" (rw) 208 : "cc", "memory"); 209 210 return ((rv & 0xff)? rv >> 8 : 0); 211 } 212 213 static __inline int 214 EDD_rw(int rw, int dev, u_int32_t daddr, u_int32_t nblk, void *buf) 215 { 216 int rv; 217 volatile static struct EDD_CB cb; 218 219 /* Zero out reserved stuff */ 220 cb.edd_res1 = 0; 221 cb.edd_res2 = 0; 222 223 /* Fill in parameters */ 224 cb.edd_len = sizeof(cb); 225 cb.edd_nblk = nblk; 226 cb.edd_seg = ((u_int32_t)buf >> 4) & 0xffff; 227 cb.edd_off = (u_int32_t)buf & 0xf; 228 cb.edd_daddr = daddr; 229 230 /* if offset/segment are zero, punt */ 231 if (!cb.edd_seg && !cb.edd_off) 232 return 1; 233 234 /* Call extended read/write (with disk packet) */ 235 BIOS_regs.biosr_ds = (u_int32_t)&cb >> 4; 236 __asm volatile (DOINT(0x13) "; setc %b0" : "=a" (rv) 237 : "0" ((rw == F_READ)? 0x4200: 0x4300), 238 "d" (dev), "S" ((int) (&cb) & 0xf) : "%ecx", "cc"); 239 return ((rv & 0xff)? rv >> 8 : 0); 240 } 241 242 /* 243 * Read given sector, handling retry/errors/etc. 244 */ 245 int 246 biosd_io(int rw, bios_diskinfo_t *bd, u_int off, int nsect, void *buf) 247 { 248 int dev = bd->bios_number; 249 int j, error; 250 void *bb, *bb1 = NULL; 251 int bbsize = nsect * DEV_BSIZE; 252 253 if (bd->flags & BDI_EL_TORITO) { /* It's a CD device */ 254 dev &= 0xff; /* Mask out this flag bit */ 255 256 /* 257 * sys/lib/libsa/cd9600.c converts 2,048-byte CD sectors 258 * to DEV_BSIZE blocks before calling the device strategy 259 * routine. However, the El Torito spec says that the 260 * BIOS will work in 2,048-byte sectors. So shift back. 261 */ 262 off /= (ISO_DEFAULT_BLOCK_SIZE / DEV_BSIZE); 263 nsect /= (ISO_DEFAULT_BLOCK_SIZE / DEV_BSIZE); 264 } 265 266 /* 267 * Use a bounce buffer to not cross 64k DMA boundary, and to 268 * not access 1 MB or above. 269 */ 270 if (((((u_int32_t)buf) & ~0xffff) != 271 (((u_int32_t)buf + bbsize) & ~0xffff)) || 272 (((u_int32_t)buf) >= 0x100000)) { 273 /* 274 * XXX we believe that all the io is buffered 275 * by fs routines, so no big reads anyway 276 */ 277 bb = bb1 = alloc(bbsize); 278 if (rw != F_READ) 279 bcopy(buf, bb, bbsize); 280 } else 281 bb = buf; 282 283 /* Try to do operation up to 5 times */ 284 for (error = 1, j = 5; j-- && error; ) { 285 /* CHS or LBA access? */ 286 if (bd->bios_edd != -1) { 287 error = EDD_rw(rw, dev, off, nsect, bb); 288 } else { 289 int cyl, head, sect; 290 size_t i, n; 291 char *p = bb; 292 293 /* Handle track boundaries */ 294 for (error = i = 0; error == 0 && i < nsect; 295 i += n, off += n, p += n * DEV_BSIZE) { 296 297 btochs(off, cyl, head, sect, bd->bios_heads, 298 bd->bios_sectors); 299 300 if ((sect + (nsect - i)) >= bd->bios_sectors) 301 n = bd->bios_sectors - sect; 302 else 303 n = nsect - i; 304 305 error = CHS_rw(rw, dev, cyl, head, sect, n, p); 306 307 /* ECC corrected */ 308 if (error == 0x11) 309 error = 0; 310 } 311 } 312 switch (error) { 313 case 0x00: /* No errors */ 314 case 0x11: /* ECC corrected */ 315 error = 0; 316 break; 317 318 default: /* All other errors */ 319 #ifdef BIOS_DEBUG 320 if (debug) 321 printf("\nBIOS error 0x%x (%s)\n", 322 error, biosdisk_err(error)); 323 #endif 324 biosdreset(dev); 325 break; 326 } 327 } 328 329 if (bb != buf && rw == F_READ) 330 bcopy(bb, buf, bbsize); 331 free(bb1, bbsize); 332 333 #ifdef BIOS_DEBUG 334 if (debug) { 335 if (error != 0) 336 printf("=0x%x(%s)", error, biosdisk_err(error)); 337 putchar('\n'); 338 } 339 #endif 340 341 return error; 342 } 343 344 int 345 biosd_diskio(int rw, struct diskinfo *dip, u_int off, int nsect, void *buf) 346 { 347 return biosd_io(rw, &dip->bios_info, off, nsect, buf); 348 } 349 /* 350 * Try to read the bsd label on the given BIOS device. 351 */ 352 static u_int 353 findopenbsd(bios_diskinfo_t *bd, const char **err) 354 { 355 struct dos_mbr mbr; 356 struct dos_partition *dp; 357 u_int mbroff = DOSBBSECTOR; 358 u_int mbr_eoff = DOSBBSECTOR; /* Offset of MBR extended partition. */ 359 int error, i, maxebr = DOS_MAXEBR, nextebr; 360 361 again: 362 if (!maxebr--) { 363 *err = "too many extended partitions"; 364 return (-1); 365 } 366 367 /* Read MBR */ 368 bzero(&mbr, sizeof(mbr)); 369 error = biosd_io(F_READ, bd, mbroff, 1, &mbr); 370 if (error) { 371 *err = biosdisk_err(error); 372 return (-1); 373 } 374 375 /* check mbr signature */ 376 if (mbr.dmbr_sign != DOSMBR_SIGNATURE) { 377 *err = "bad MBR signature\n"; 378 return (-1); 379 } 380 381 /* Search for OpenBSD partition */ 382 nextebr = 0; 383 for (i = 0; i < NDOSPART; i++) { 384 dp = &mbr.dmbr_parts[i]; 385 if (!dp->dp_size) 386 continue; 387 #ifdef BIOS_DEBUG 388 if (debug) 389 printf("found partition %u: " 390 "type %u (0x%x) offset %u (0x%x)\n", 391 (int)(dp - mbr.dmbr_parts), 392 dp->dp_typ, dp->dp_typ, 393 dp->dp_start, dp->dp_start); 394 #endif 395 if (dp->dp_typ == DOSPTYP_OPENBSD) { 396 if (dp->dp_start > (dp->dp_start + mbroff)) 397 continue; 398 return (dp->dp_start + mbroff); 399 } 400 401 /* 402 * Record location of next ebr if and only if this is the first 403 * extended partition in this boot record! 404 */ 405 if (!nextebr && (dp->dp_typ == DOSPTYP_EXTEND || 406 dp->dp_typ == DOSPTYP_EXTENDL)) { 407 nextebr = dp->dp_start + mbr_eoff; 408 if (nextebr < dp->dp_start) 409 nextebr = (u_int)-1; 410 if (mbr_eoff == DOSBBSECTOR) 411 mbr_eoff = dp->dp_start; 412 } 413 } 414 415 if (nextebr && nextebr != (u_int)-1) { 416 mbroff = nextebr; 417 goto again; 418 } 419 420 return (-1); 421 } 422 423 const char * 424 bios_getdisklabel(bios_diskinfo_t *bd, struct disklabel *label) 425 { 426 u_int start = 0; 427 char buf[DEV_BSIZE]; 428 const char *err = NULL; 429 int error; 430 431 /* Sanity check */ 432 if (bd->bios_edd == -1 && 433 (bd->bios_heads == 0 || bd->bios_sectors == 0)) 434 return "failed to read disklabel"; 435 436 /* MBR is a harddisk thing */ 437 if (bd->bios_number & 0x80) { 438 start = findopenbsd(bd, &err); 439 if (start == (u_int)-1) { 440 if (err != NULL) 441 return (err); 442 return "no OpenBSD partition\n"; 443 } 444 } 445 446 /* Load BSD disklabel */ 447 #ifdef BIOS_DEBUG 448 if (debug) 449 printf("loading disklabel @ %u\n", start + DOS_LABELSECTOR); 450 #endif 451 /* read disklabel */ 452 error = biosd_io(F_READ, bd, start + DOS_LABELSECTOR, 1, buf); 453 454 if (error) 455 return "failed to read disklabel"; 456 457 /* Fill in disklabel */ 458 return (getdisklabel(buf, label)); 459 } 460 461 int 462 biosopen(struct open_file *f, ...) 463 { 464 #ifdef SOFTRAID 465 struct sr_boot_volume *bv; 466 #endif 467 register char *cp, **file; 468 dev_t maj, unit, part; 469 struct diskinfo *dip; 470 int biosdev, devlen; 471 const char *st; 472 va_list ap; 473 char *dev; 474 475 va_start(ap, f); 476 cp = *(file = va_arg(ap, char **)); 477 va_end(ap); 478 479 #ifdef BIOS_DEBUG 480 if (debug) 481 printf("%s\n", cp); 482 #endif 483 484 f->f_devdata = NULL; 485 486 /* Search for device specification. */ 487 dev = cp; 488 if (cp[4] == ':') 489 devlen = 2; 490 else if (cp[5] == ':') 491 devlen = 3; 492 else 493 return ENOENT; 494 cp += devlen; 495 496 /* Get unit. */ 497 if ('0' <= *cp && *cp <= '9') 498 unit = *cp++ - '0'; 499 else { 500 printf("Bad unit number\n"); 501 return EUNIT; 502 } 503 504 /* Get partition. */ 505 if ('a' <= *cp && *cp <= 'p') 506 part = *cp++ - 'a'; 507 else { 508 printf("Bad partition\n"); 509 return EPART; 510 } 511 512 /* Get filename. */ 513 cp++; /* skip ':' */ 514 if (*cp != 0) 515 *file = cp; 516 else 517 f->f_flags |= F_RAW; 518 519 #ifdef SOFTRAID 520 /* Intercept softraid disks. */ 521 if (strncmp("sr", dev, 2) == 0) { 522 523 /* Create a fake diskinfo for this softraid volume. */ 524 SLIST_FOREACH(bv, &sr_volumes, sbv_link) 525 if (bv->sbv_unit == unit) 526 break; 527 if (bv == NULL) { 528 printf("Unknown device: sr%d\n", unit); 529 return EADAPT; 530 } 531 532 if (bv->sbv_level == 'C' && bv->sbv_keys == NULL) 533 if (sr_crypto_decrypt_keys(bv) != 0) 534 return EPERM; 535 536 if (bv->sbv_diskinfo == NULL) { 537 dip = alloc(sizeof(struct diskinfo)); 538 bzero(dip, sizeof(*dip)); 539 bv->sbv_diskinfo = dip; 540 dip->sr_vol = bv; 541 dip->bios_info.flags |= BDI_BADLABEL; 542 } 543 544 dip = bv->sbv_diskinfo; 545 546 if (dip->bios_info.flags & BDI_BADLABEL) { 547 /* Attempt to read disklabel. */ 548 bv->sbv_part = 'c'; 549 if (sr_getdisklabel(bv, &dip->disklabel)) 550 return ERDLAB; 551 dip->bios_info.flags &= ~BDI_BADLABEL; 552 } 553 554 bv->sbv_part = part + 'a'; 555 556 bootdev_dip = dip; 557 f->f_devdata = dip; 558 559 return 0; 560 } 561 #endif 562 563 for (maj = 0; maj < nbdevs && 564 strncmp(dev, bdevs[maj], devlen); maj++); 565 if (maj >= nbdevs) { 566 printf("Unknown device: "); 567 for (cp = *file; *cp != ':'; cp++) 568 putchar(*cp); 569 putchar('\n'); 570 return EADAPT; 571 } 572 573 biosdev = unit; 574 switch (maj) { 575 case 0: /* wd */ 576 case 4: /* sd */ 577 case 17: /* hd */ 578 biosdev |= 0x80; 579 break; 580 case 2: /* fd */ 581 break; 582 case 6: /* cd */ 583 biosdev = bios_bootdev & 0xff; 584 break; 585 default: 586 return ENXIO; 587 } 588 589 /* Find device */ 590 bootdev_dip = dip = dklookup(biosdev); 591 592 /* Fix up bootdev */ 593 { dev_t bsd_dev; 594 bsd_dev = dip->bios_info.bsd_dev; 595 dip->bsddev = MAKEBOOTDEV(B_TYPE(bsd_dev), B_ADAPTOR(bsd_dev), 596 B_CONTROLLER(bsd_dev), unit, part); 597 dip->bootdev = MAKEBOOTDEV(B_TYPE(bsd_dev), B_ADAPTOR(bsd_dev), 598 B_CONTROLLER(bsd_dev), B_UNIT(bsd_dev), part); 599 } 600 601 #if 0 602 dip->bios_info.bsd_dev = dip->bootdev; 603 bootdev = dip->bootdev; 604 #endif 605 606 #ifdef BIOS_DEBUG 607 if (debug) { 608 printf("BIOS geometry: heads=%u, s/t=%u; EDD=%d\n", 609 dip->bios_info.bios_heads, dip->bios_info.bios_sectors, 610 dip->bios_info.bios_edd); 611 } 612 #endif 613 614 /* Try for disklabel again (might be removable media) */ 615 if (dip->bios_info.flags & BDI_BADLABEL) { 616 st = bios_getdisklabel(&dip->bios_info, &dip->disklabel); 617 #ifdef BIOS_DEBUG 618 if (debug && st) 619 printf("%s\n", st); 620 #endif 621 if (!st) { 622 dip->bios_info.flags &= ~BDI_BADLABEL; 623 dip->bios_info.flags |= BDI_GOODLABEL; 624 } else 625 return ERDLAB; 626 } 627 628 f->f_devdata = dip; 629 630 return 0; 631 } 632 633 const u_char bidos_errs[] = 634 /* ignored "\x00" "successful completion\0" */ 635 "\x01" "invalid function/parameter\0" 636 "\x02" "address mark not found\0" 637 "\x03" "write-protected\0" 638 "\x04" "sector not found\0" 639 "\x05" "reset failed\0" 640 "\x06" "disk changed\0" 641 "\x07" "drive parameter activity failed\0" 642 "\x08" "DMA overrun\0" 643 "\x09" "data boundary error\0" 644 "\x0A" "bad sector detected\0" 645 "\x0B" "bad track detected\0" 646 "\x0C" "invalid media\0" 647 "\x0E" "control data address mark detected\0" 648 "\x0F" "DMA arbitration level out of range\0" 649 "\x10" "uncorrectable CRC or ECC error on read\0" 650 /* ignored "\x11" "data ECC corrected\0" */ 651 "\x20" "controller failure\0" 652 "\x31" "no media in drive\0" 653 "\x32" "incorrect drive type in CMOS\0" 654 "\x40" "seek failed\0" 655 "\x80" "operation timed out\0" 656 "\xAA" "drive not ready\0" 657 "\xB0" "volume not locked in drive\0" 658 "\xB1" "volume locked in drive\0" 659 "\xB2" "volume not removable\0" 660 "\xB3" "volume in use\0" 661 "\xB4" "lock count exceeded\0" 662 "\xB5" "valid eject request failed\0" 663 "\xBB" "undefined error\0" 664 "\xCC" "write fault\0" 665 "\xE0" "status register error\0" 666 "\xFF" "sense operation failed\0" 667 "\x00" "\0"; 668 669 static const char * 670 biosdisk_err(u_int error) 671 { 672 register const u_char *p = bidos_errs; 673 674 while (*p && *p != error) 675 while (*p++); 676 677 return ++p; 678 } 679 680 const struct biosdisk_errors { 681 u_char error; 682 u_char errno; 683 } tab[] = { 684 { 0x01, EINVAL }, 685 { 0x03, EROFS }, 686 { 0x08, EINVAL }, 687 { 0x09, EINVAL }, 688 { 0x0A, EBSE }, 689 { 0x0B, EBSE }, 690 { 0x0C, ENXIO }, 691 { 0x0D, EINVAL }, 692 { 0x10, EECC }, 693 { 0x20, EHER }, 694 { 0x31, ENXIO }, 695 { 0x32, ENXIO }, 696 { 0x00, EIO } 697 }; 698 699 static int 700 biosdisk_errno(u_int error) 701 { 702 register const struct biosdisk_errors *p; 703 704 if (error == 0) 705 return 0; 706 707 for (p = tab; p->error && p->error != error; p++); 708 709 return p->errno; 710 } 711 712 int 713 biosstrategy(void *devdata, int rw, daddr32_t blk, size_t size, void *buf, 714 size_t *rsize) 715 { 716 struct diskinfo *dip = (struct diskinfo *)devdata; 717 bios_diskinfo_t *bd = &dip->bios_info; 718 u_int8_t error = 0; 719 size_t nsect; 720 721 #ifdef SOFTRAID 722 /* Intercept strategy for softraid volumes. */ 723 if (dip->sr_vol) 724 return sr_strategy(dip->sr_vol, rw, blk, size, buf, rsize); 725 #endif 726 727 nsect = (size + DEV_BSIZE - 1) / DEV_BSIZE; 728 blk += dip->disklabel.d_partitions[B_PARTITION(dip->bsddev)].p_offset; 729 730 /* Read all, sub-functions handle track boundaries */ 731 if (blk < 0) 732 error = EINVAL; 733 else 734 error = biosd_io(rw, bd, blk, nsect, buf); 735 736 #ifdef BIOS_DEBUG 737 if (debug) { 738 if (error != 0) 739 printf("=0x%x(%s)", error, biosdisk_err(error)); 740 putchar('\n'); 741 } 742 #endif 743 744 if (rsize != NULL) 745 *rsize = nsect * DEV_BSIZE; 746 747 return (biosdisk_errno(error)); 748 } 749 750 int 751 biosclose(struct open_file *f) 752 { 753 f->f_devdata = NULL; 754 755 return 0; 756 } 757 758 int 759 biosioctl(struct open_file *f, u_long cmd, void *data) 760 { 761 return 0; 762 } 763