1 /*- 2 * Copyright (c) 1994 Bruce D. Evans. 3 * All rights reserved. 4 * 5 * Copyright (c) 1982, 1986, 1988 Regents of the University of California. 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 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * from: @(#)ufs_disksubr.c 7.16 (Berkeley) 5/4/91 37 * from: ufs_disksubr.c,v 1.8 1994/06/07 01:21:39 phk Exp $ 38 * $FreeBSD: src/sys/kern/subr_diskmbr.c,v 1.45 2000/01/28 10:22:07 bde Exp $ 39 * $DragonFly: src/sys/kern/subr_diskmbr.c,v 1.4 2003/08/26 21:09:02 rob Exp $ 40 */ 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/buf.h> 45 #include <sys/conf.h> 46 #ifdef PC98 47 #define PC98_ATCOMPAT 48 #define dsinit atcompat_dsinit 49 #endif 50 #include <sys/disklabel.h> 51 #define DOSPTYP_EXTENDED 5 52 #define DOSPTYP_EXTENDEDX 15 53 #define DOSPTYP_ONTRACK 84 54 #include <sys/diskslice.h> 55 #include <sys/malloc.h> 56 #include <sys/syslog.h> 57 #include <sys/device.h> 58 59 #define TRACE(str) do { if (dsi_debug) printf str; } while (0) 60 61 static volatile u_char dsi_debug; 62 63 static struct dos_partition historical_bogus_partition_table[NDOSPART] = { 64 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }, 65 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }, 66 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }, 67 { 0x80, 0, 1, 0, DOSPTYP_386BSD, 255, 255, 255, 0, 50000, }, 68 }; 69 70 static int check_part (char *sname, struct dos_partition *dp, 71 u_long offset, int nsectors, int ntracks, 72 u_long mbr_offset); 73 static void mbr_extended (dev_t dev, struct disklabel *lp, 74 struct diskslices *ssp, u_long ext_offset, 75 u_long ext_size, u_long base_ext_offset, 76 int nsectors, int ntracks, u_long mbr_offset, 77 int level); 78 static int mbr_setslice (char *sname, struct disklabel *lp, 79 struct diskslice *sp, struct dos_partition *dp, 80 u_long br_offset); 81 82 static int 83 check_part(sname, dp, offset, nsectors, ntracks, mbr_offset ) 84 char *sname; 85 struct dos_partition *dp; 86 u_long offset; 87 int nsectors; 88 int ntracks; 89 u_long mbr_offset; 90 { 91 int chs_ecyl; 92 int chs_esect; 93 int chs_scyl; 94 int chs_ssect; 95 int error; 96 u_long esector; 97 u_long esector1; 98 u_long secpercyl; 99 u_long ssector; 100 u_long ssector1; 101 102 secpercyl = (u_long)nsectors * ntracks; 103 chs_scyl = DPCYL(dp->dp_scyl, dp->dp_ssect); 104 chs_ssect = DPSECT(dp->dp_ssect); 105 ssector = chs_ssect - 1 + dp->dp_shd * nsectors + chs_scyl * secpercyl 106 + mbr_offset; 107 ssector1 = offset + dp->dp_start; 108 109 /* 110 * If ssector1 is on a cylinder >= 1024, then ssector can't be right. 111 * Allow the C/H/S for it to be 1023/ntracks-1/nsectors, or correct 112 * apart from the cylinder being reduced modulo 1024. Always allow 113 * 1023/255/63. 114 */ 115 if ((ssector < ssector1 116 && ((chs_ssect == nsectors && dp->dp_shd == ntracks - 1 117 && chs_scyl == 1023) 118 || (secpercyl != 0 119 && (ssector1 - ssector) % (1024 * secpercyl) == 0))) 120 || (dp->dp_scyl == 255 && dp->dp_shd == 255 121 && dp->dp_ssect == 255)) { 122 TRACE(("%s: C/H/S start %d/%d/%d, start %lu: allow\n", 123 sname, chs_scyl, dp->dp_shd, chs_ssect, ssector1)); 124 ssector = ssector1; 125 } 126 127 chs_ecyl = DPCYL(dp->dp_ecyl, dp->dp_esect); 128 chs_esect = DPSECT(dp->dp_esect); 129 esector = chs_esect - 1 + dp->dp_ehd * nsectors + chs_ecyl * secpercyl 130 + mbr_offset; 131 esector1 = ssector1 + dp->dp_size - 1; 132 133 /* Allow certain bogus C/H/S values for esector, as above. */ 134 if ((esector < esector1 135 && ((chs_esect == nsectors && dp->dp_ehd == ntracks - 1 136 && chs_ecyl == 1023) 137 || (secpercyl != 0 138 && (esector1 - esector) % (1024 * secpercyl) == 0))) 139 || (dp->dp_ecyl == 255 && dp->dp_ehd == 255 140 && dp->dp_esect == 255)) { 141 TRACE(("%s: C/H/S end %d/%d/%d, end %lu: allow\n", 142 sname, chs_ecyl, dp->dp_ehd, chs_esect, esector1)); 143 esector = esector1; 144 } 145 146 error = (ssector == ssector1 && esector == esector1) ? 0 : EINVAL; 147 if (bootverbose) 148 printf("%s: type 0x%x, start %lu, end = %lu, size %lu %s\n", 149 sname, dp->dp_typ, ssector1, esector1, 150 (u_long)dp->dp_size, error ? "" : ": OK"); 151 if (ssector != ssector1 && bootverbose) 152 printf("%s: C/H/S start %d/%d/%d (%lu) != start %lu: invalid\n", 153 sname, chs_scyl, dp->dp_shd, chs_ssect, 154 ssector, ssector1); 155 if (esector != esector1 && bootverbose) 156 printf("%s: C/H/S end %d/%d/%d (%lu) != end %lu: invalid\n", 157 sname, chs_ecyl, dp->dp_ehd, chs_esect, 158 esector, esector1); 159 return (error); 160 } 161 162 int 163 dsinit(dev, lp, sspp) 164 dev_t dev; 165 struct disklabel *lp; 166 struct diskslices **sspp; 167 { 168 struct buf *bp; 169 u_char *cp; 170 int dospart; 171 struct dos_partition *dp; 172 struct dos_partition *dp0; 173 struct dos_partition dpcopy[NDOSPART]; 174 int error; 175 int max_ncyls; 176 int max_nsectors; 177 int max_ntracks; 178 u_long mbr_offset; 179 char partname[2]; 180 u_long secpercyl; 181 char *sname; 182 struct diskslice *sp; 183 struct diskslices *ssp; 184 185 mbr_offset = DOSBBSECTOR; 186 reread_mbr: 187 /* Read master boot record. */ 188 bp = geteblk((int)lp->d_secsize); 189 bp->b_dev = dkmodpart(dkmodslice(dev, WHOLE_DISK_SLICE), RAW_PART); 190 bp->b_blkno = mbr_offset; 191 bp->b_bcount = lp->d_secsize; 192 bp->b_flags |= B_READ; 193 BUF_STRATEGY(bp, 1); 194 if (biowait(bp) != 0) { 195 diskerr(bp, "reading primary partition table: error", 196 LOG_PRINTF, 0, (struct disklabel *)NULL); 197 printf("\n"); 198 error = EIO; 199 goto done; 200 } 201 202 /* Weakly verify it. */ 203 cp = bp->b_data; 204 sname = dsname(dev, dkunit(dev), WHOLE_DISK_SLICE, RAW_PART, partname); 205 if (cp[0x1FE] != 0x55 || cp[0x1FF] != 0xAA) { 206 if (bootverbose) 207 printf("%s: invalid primary partition table: no magic\n", 208 sname); 209 error = EINVAL; 210 goto done; 211 } 212 213 /* Make a copy of the partition table to avoid alignment problems. */ 214 memcpy(&dpcopy[0], cp + DOSPARTOFF, sizeof(dpcopy)); 215 216 dp0 = &dpcopy[0]; 217 218 /* Check for "Ontrack Diskmanager". */ 219 for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++) { 220 if (dp->dp_typ == DOSPTYP_ONTRACK) { 221 if (bootverbose) 222 printf( 223 "%s: Found \"Ontrack Disk Manager\" on this disk.\n", sname); 224 bp->b_flags |= B_INVAL | B_AGE; 225 brelse(bp); 226 mbr_offset = 63; 227 goto reread_mbr; 228 } 229 } 230 231 if (bcmp(dp0, historical_bogus_partition_table, 232 sizeof historical_bogus_partition_table) == 0) { 233 TRACE(("%s: invalid primary partition table: historical\n", 234 sname)); 235 error = EINVAL; 236 goto done; 237 } 238 239 /* Guess the geometry. */ 240 /* 241 * TODO: 242 * Perhaps skip entries with 0 size. 243 * Perhaps only look at entries of type DOSPTYP_386BSD. 244 */ 245 max_ncyls = 0; 246 max_nsectors = 0; 247 max_ntracks = 0; 248 for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++) { 249 int ncyls; 250 int nsectors; 251 int ntracks; 252 253 ncyls = DPCYL(dp->dp_ecyl, dp->dp_esect) + 1; 254 if (max_ncyls < ncyls) 255 max_ncyls = ncyls; 256 nsectors = DPSECT(dp->dp_esect); 257 if (max_nsectors < nsectors) 258 max_nsectors = nsectors; 259 ntracks = dp->dp_ehd + 1; 260 if (max_ntracks < ntracks) 261 max_ntracks = ntracks; 262 } 263 264 /* 265 * Check that we have guessed the geometry right by checking the 266 * partition entries. 267 */ 268 /* 269 * TODO: 270 * As above. 271 * Check for overlaps. 272 * Check against d_secperunit if the latter is reliable. 273 */ 274 error = 0; 275 for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++) { 276 if (dp->dp_scyl == 0 && dp->dp_shd == 0 && dp->dp_ssect == 0 277 && dp->dp_start == 0 && dp->dp_size == 0) 278 continue; 279 sname = dsname(dev, dkunit(dev), BASE_SLICE + dospart, 280 RAW_PART, partname); 281 282 /* 283 * Temporarily ignore errors from this check. We could 284 * simplify things by accepting the table eariler if we 285 * always ignore errors here. Perhaps we should always 286 * accept the table if the magic is right but not let 287 * bad entries affect the geometry. 288 */ 289 check_part(sname, dp, mbr_offset, max_nsectors, max_ntracks, 290 mbr_offset); 291 } 292 if (error != 0) 293 goto done; 294 295 /* 296 * Accept the DOS partition table. 297 * First adjust the label (we have been careful not to change it 298 * before we can guarantee success). 299 */ 300 secpercyl = (u_long)max_nsectors * max_ntracks; 301 if (secpercyl != 0) { 302 #if 0 303 u_long secperunit; 304 #endif 305 306 lp->d_nsectors = max_nsectors; 307 lp->d_ntracks = max_ntracks; 308 lp->d_secpercyl = secpercyl; 309 /* 310 * Temporarily, don't even consider adjusting the drive's 311 * size, since the adjusted size may exceed the hardware's 312 * addressing capabilities. The adjustment helped mainly 313 * for ancient MFM drives with > 1024 cylinders, but now 314 * breaks at least IDE drives with 63*16*65536 sectors if 315 * they are controlled by the wd driver in CHS mode. 316 */ 317 #if 0 318 secperunit = secpercyl * max_ncyls; 319 if (lp->d_secperunit < secperunit) 320 lp->d_secperunit = secperunit; 321 #endif 322 lp->d_ncylinders = lp->d_secperunit / secpercyl; 323 } 324 325 /* 326 * We are passed a pointer to a suitably initialized minimal 327 * slices "struct" with no dangling pointers in it. Replace it 328 * by a maximal one. This usually oversizes the "struct", but 329 * enlarging it while searching for logical drives would be 330 * inconvenient. 331 */ 332 free(*sspp, M_DEVBUF); 333 ssp = dsmakeslicestruct(MAX_SLICES, lp); 334 *sspp = ssp; 335 336 /* Initialize normal slices. */ 337 sp = &ssp->dss_slices[BASE_SLICE]; 338 for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++, sp++) { 339 sname = dsname(dev, dkunit(dev), BASE_SLICE + dospart, 340 RAW_PART, partname); 341 (void)mbr_setslice(sname, lp, sp, dp, mbr_offset); 342 } 343 ssp->dss_nslices = BASE_SLICE + NDOSPART; 344 345 /* Handle extended partitions. */ 346 sp -= NDOSPART; 347 for (dospart = 0; dospart < NDOSPART; dospart++, sp++) 348 if (sp->ds_type == DOSPTYP_EXTENDED || 349 sp->ds_type == DOSPTYP_EXTENDEDX) 350 mbr_extended(bp->b_dev, lp, ssp, 351 sp->ds_offset, sp->ds_size, sp->ds_offset, 352 max_nsectors, max_ntracks, mbr_offset, 1); 353 354 /* 355 * mbr_extended() abuses ssp->dss_nslices for the number of slices 356 * that would be found if there were no limit on the number of slices 357 * in *ssp. Cut it back now. 358 */ 359 if (ssp->dss_nslices > MAX_SLICES) 360 ssp->dss_nslices = MAX_SLICES; 361 362 done: 363 bp->b_flags |= B_INVAL | B_AGE; 364 brelse(bp); 365 if (error == EINVAL) 366 error = 0; 367 return (error); 368 } 369 370 void 371 mbr_extended(dev, lp, ssp, ext_offset, ext_size, base_ext_offset, nsectors, 372 ntracks, mbr_offset, level) 373 dev_t dev; 374 struct disklabel *lp; 375 struct diskslices *ssp; 376 u_long ext_offset; 377 u_long ext_size; 378 u_long base_ext_offset; 379 int nsectors; 380 int ntracks; 381 u_long mbr_offset; 382 int level; 383 { 384 struct buf *bp; 385 u_char *cp; 386 int dospart; 387 struct dos_partition *dp; 388 struct dos_partition dpcopy[NDOSPART]; 389 u_long ext_offsets[NDOSPART]; 390 u_long ext_sizes[NDOSPART]; 391 char partname[2]; 392 int slice; 393 char *sname; 394 struct diskslice *sp; 395 396 if (level >= 16) { 397 printf( 398 "%s: excessive recursion in search for slices; aborting search\n", 399 devtoname(dev)); 400 return; 401 } 402 403 /* Read extended boot record. */ 404 bp = geteblk((int)lp->d_secsize); 405 bp->b_dev = dev; 406 bp->b_blkno = ext_offset; 407 bp->b_bcount = lp->d_secsize; 408 bp->b_flags |= B_READ; 409 BUF_STRATEGY(bp, 1); 410 if (biowait(bp) != 0) { 411 diskerr(bp, "reading extended partition table: error", 412 LOG_PRINTF, 0, (struct disklabel *)NULL); 413 printf("\n"); 414 goto done; 415 } 416 417 /* Weakly verify it. */ 418 cp = bp->b_data; 419 if (cp[0x1FE] != 0x55 || cp[0x1FF] != 0xAA) { 420 sname = dsname(dev, dkunit(dev), WHOLE_DISK_SLICE, RAW_PART, 421 partname); 422 if (bootverbose) 423 printf("%s: invalid extended partition table: no magic\n", 424 sname); 425 goto done; 426 } 427 428 /* Make a copy of the partition table to avoid alignment problems. */ 429 memcpy(&dpcopy[0], cp + DOSPARTOFF, sizeof(dpcopy)); 430 431 slice = ssp->dss_nslices; 432 for (dospart = 0, dp = &dpcopy[0]; dospart < NDOSPART; 433 dospart++, dp++) { 434 ext_sizes[dospart] = 0; 435 if (dp->dp_scyl == 0 && dp->dp_shd == 0 && dp->dp_ssect == 0 436 && dp->dp_start == 0 && dp->dp_size == 0) 437 continue; 438 if (dp->dp_typ == DOSPTYP_EXTENDED || 439 dp->dp_typ == DOSPTYP_EXTENDEDX) { 440 static char buf[32]; 441 442 sname = dsname(dev, dkunit(dev), WHOLE_DISK_SLICE, 443 RAW_PART, partname); 444 snprintf(buf, sizeof(buf), "%s", sname); 445 if (strlen(buf) < sizeof buf - 11) 446 strcat(buf, "<extended>"); 447 check_part(buf, dp, base_ext_offset, nsectors, 448 ntracks, mbr_offset); 449 ext_offsets[dospart] = base_ext_offset + dp->dp_start; 450 ext_sizes[dospart] = dp->dp_size; 451 } else { 452 sname = dsname(dev, dkunit(dev), slice, RAW_PART, 453 partname); 454 check_part(sname, dp, ext_offset, nsectors, ntracks, 455 mbr_offset); 456 if (slice >= MAX_SLICES) { 457 printf("%s: too many slices\n", sname); 458 slice++; 459 continue; 460 } 461 sp = &ssp->dss_slices[slice]; 462 if (mbr_setslice(sname, lp, sp, dp, ext_offset) != 0) 463 continue; 464 slice++; 465 } 466 } 467 ssp->dss_nslices = slice; 468 469 /* If we found any more slices, recursively find all the subslices. */ 470 for (dospart = 0; dospart < NDOSPART; dospart++) 471 if (ext_sizes[dospart] != 0) 472 mbr_extended(dev, lp, ssp, ext_offsets[dospart], 473 ext_sizes[dospart], base_ext_offset, 474 nsectors, ntracks, mbr_offset, ++level); 475 476 done: 477 bp->b_flags |= B_INVAL | B_AGE; 478 brelse(bp); 479 } 480 481 static int 482 mbr_setslice(sname, lp, sp, dp, br_offset) 483 char *sname; 484 struct disklabel *lp; 485 struct diskslice *sp; 486 struct dos_partition *dp; 487 u_long br_offset; 488 { 489 u_long offset; 490 u_long size; 491 492 offset = br_offset + dp->dp_start; 493 if (offset > lp->d_secperunit || offset < br_offset) { 494 printf( 495 "%s: slice starts beyond end of the disk: rejecting it\n", 496 sname); 497 return (1); 498 } 499 size = lp->d_secperunit - offset; 500 if (size >= dp->dp_size) 501 size = dp->dp_size; 502 else 503 printf( 504 "%s: slice extends beyond end of disk: truncating from %lu to %lu sectors\n", 505 sname, (u_long)dp->dp_size, size); 506 sp->ds_offset = offset; 507 sp->ds_size = size; 508 sp->ds_type = dp->dp_typ; 509 #ifdef PC98_ATCOMPAT 510 /* Fake FreeBSD(98). */ 511 if (sp->ds_type == DOSPTYP_386BSD) 512 sp->ds_type = 0x94; 513 #endif 514 #if 0 515 lp->d_subtype |= (lp->d_subtype & 3) | dospart | DSTYPE_INDOSPART; 516 #endif 517 return (0); 518 } 519 520 #ifdef __alpha__ 521 void 522 alpha_fix_srm_checksum(bp) 523 struct buf *bp; 524 { 525 u_int64_t *p; 526 u_int64_t sum; 527 int i; 528 529 p = (u_int64_t *) bp->b_data; 530 sum = 0; 531 for (i = 0; i < 63; i++) 532 sum += p[i]; 533 p[63] = sum; 534 } 535 #endif 536