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 1.5 2003/11/10 06:12:13 dillon 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/diskmbr.h> 56 #include <sys/malloc.h> 57 #include <sys/syslog.h> 58 #include <sys/device.h> 59 60 #define TRACE(str) do { if (dsi_debug) printf str; } while (0) 61 62 static volatile u_char dsi_debug; 63 64 static struct dos_partition historical_bogus_partition_table[NDOSPART] = { 65 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }, 66 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }, 67 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }, 68 { 0x80, 0, 1, 0, DOSPTYP_386BSD, 255, 255, 255, 0, 50000, }, 69 }; 70 71 static int check_part (char *sname, struct dos_partition *dp, 72 u_long offset, int nsectors, int ntracks, 73 u_long mbr_offset); 74 static void mbr_extended (dev_t dev, struct disklabel *lp, 75 struct diskslices *ssp, u_long ext_offset, 76 u_long ext_size, u_long base_ext_offset, 77 int nsectors, int ntracks, u_long mbr_offset, 78 int level); 79 static int mbr_setslice (char *sname, struct disklabel *lp, 80 struct diskslice *sp, struct dos_partition *dp, 81 u_long br_offset); 82 83 static int 84 check_part(sname, dp, offset, nsectors, ntracks, mbr_offset ) 85 char *sname; 86 struct dos_partition *dp; 87 u_long offset; 88 int nsectors; 89 int ntracks; 90 u_long mbr_offset; 91 { 92 int chs_ecyl; 93 int chs_esect; 94 int chs_scyl; 95 int chs_ssect; 96 int error; 97 u_long esector; 98 u_long esector1; 99 u_long secpercyl; 100 u_long ssector; 101 u_long ssector1; 102 103 secpercyl = (u_long)nsectors * ntracks; 104 chs_scyl = DPCYL(dp->dp_scyl, dp->dp_ssect); 105 chs_ssect = DPSECT(dp->dp_ssect); 106 ssector = chs_ssect - 1 + dp->dp_shd * nsectors + chs_scyl * secpercyl 107 + mbr_offset; 108 ssector1 = offset + dp->dp_start; 109 110 /* 111 * If ssector1 is on a cylinder >= 1024, then ssector can't be right. 112 * Allow the C/H/S for it to be 1023/ntracks-1/nsectors, or correct 113 * apart from the cylinder being reduced modulo 1024. Always allow 114 * 1023/255/63. 115 */ 116 if ((ssector < ssector1 117 && ((chs_ssect == nsectors && dp->dp_shd == ntracks - 1 118 && chs_scyl == 1023) 119 || (secpercyl != 0 120 && (ssector1 - ssector) % (1024 * secpercyl) == 0))) 121 || (dp->dp_scyl == 255 && dp->dp_shd == 255 122 && dp->dp_ssect == 255)) { 123 TRACE(("%s: C/H/S start %d/%d/%d, start %lu: allow\n", 124 sname, chs_scyl, dp->dp_shd, chs_ssect, ssector1)); 125 ssector = ssector1; 126 } 127 128 chs_ecyl = DPCYL(dp->dp_ecyl, dp->dp_esect); 129 chs_esect = DPSECT(dp->dp_esect); 130 esector = chs_esect - 1 + dp->dp_ehd * nsectors + chs_ecyl * secpercyl 131 + mbr_offset; 132 esector1 = ssector1 + dp->dp_size - 1; 133 134 /* Allow certain bogus C/H/S values for esector, as above. */ 135 if ((esector < esector1 136 && ((chs_esect == nsectors && dp->dp_ehd == ntracks - 1 137 && chs_ecyl == 1023) 138 || (secpercyl != 0 139 && (esector1 - esector) % (1024 * secpercyl) == 0))) 140 || (dp->dp_ecyl == 255 && dp->dp_ehd == 255 141 && dp->dp_esect == 255)) { 142 TRACE(("%s: C/H/S end %d/%d/%d, end %lu: allow\n", 143 sname, chs_ecyl, dp->dp_ehd, chs_esect, esector1)); 144 esector = esector1; 145 } 146 147 error = (ssector == ssector1 && esector == esector1) ? 0 : EINVAL; 148 if (bootverbose) 149 printf("%s: type 0x%x, start %lu, end = %lu, size %lu %s\n", 150 sname, dp->dp_typ, ssector1, esector1, 151 (u_long)dp->dp_size, error ? "" : ": OK"); 152 if (ssector != ssector1 && bootverbose) 153 printf("%s: C/H/S start %d/%d/%d (%lu) != start %lu: invalid\n", 154 sname, chs_scyl, dp->dp_shd, chs_ssect, 155 ssector, ssector1); 156 if (esector != esector1 && bootverbose) 157 printf("%s: C/H/S end %d/%d/%d (%lu) != end %lu: invalid\n", 158 sname, chs_ecyl, dp->dp_ehd, chs_esect, 159 esector, esector1); 160 return (error); 161 } 162 163 int 164 dsinit(dev, lp, sspp) 165 dev_t dev; 166 struct disklabel *lp; 167 struct diskslices **sspp; 168 { 169 struct buf *bp; 170 u_char *cp; 171 int dospart; 172 struct dos_partition *dp; 173 struct dos_partition *dp0; 174 struct dos_partition dpcopy[NDOSPART]; 175 int error; 176 int max_ncyls; 177 int max_nsectors; 178 int max_ntracks; 179 u_long mbr_offset; 180 char partname[2]; 181 u_long secpercyl; 182 char *sname; 183 struct diskslice *sp; 184 struct diskslices *ssp; 185 186 mbr_offset = DOSBBSECTOR; 187 reread_mbr: 188 /* Read master boot record. */ 189 bp = geteblk((int)lp->d_secsize); 190 bp->b_dev = dkmodpart(dkmodslice(dev, WHOLE_DISK_SLICE), RAW_PART); 191 bp->b_blkno = mbr_offset; 192 bp->b_bcount = lp->d_secsize; 193 bp->b_flags |= B_READ; 194 BUF_STRATEGY(bp, 1); 195 if (biowait(bp) != 0) { 196 diskerr(bp, "reading primary partition table: error", 197 LOG_PRINTF, 0, (struct disklabel *)NULL); 198 printf("\n"); 199 error = EIO; 200 goto done; 201 } 202 203 /* Weakly verify it. */ 204 cp = bp->b_data; 205 sname = dsname(dev, dkunit(dev), WHOLE_DISK_SLICE, RAW_PART, partname); 206 if (cp[0x1FE] != 0x55 || cp[0x1FF] != 0xAA) { 207 if (bootverbose) 208 printf("%s: invalid primary partition table: no magic\n", 209 sname); 210 error = EINVAL; 211 goto done; 212 } 213 214 /* Make a copy of the partition table to avoid alignment problems. */ 215 memcpy(&dpcopy[0], cp + DOSPARTOFF, sizeof(dpcopy)); 216 217 dp0 = &dpcopy[0]; 218 219 /* Check for "Ontrack Diskmanager". */ 220 for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++) { 221 if (dp->dp_typ == DOSPTYP_ONTRACK) { 222 if (bootverbose) 223 printf( 224 "%s: Found \"Ontrack Disk Manager\" on this disk.\n", sname); 225 bp->b_flags |= B_INVAL | B_AGE; 226 brelse(bp); 227 mbr_offset = 63; 228 goto reread_mbr; 229 } 230 } 231 232 if (bcmp(dp0, historical_bogus_partition_table, 233 sizeof historical_bogus_partition_table) == 0) { 234 TRACE(("%s: invalid primary partition table: historical\n", 235 sname)); 236 error = EINVAL; 237 goto done; 238 } 239 240 /* Guess the geometry. */ 241 /* 242 * TODO: 243 * Perhaps skip entries with 0 size. 244 * Perhaps only look at entries of type DOSPTYP_386BSD. 245 */ 246 max_ncyls = 0; 247 max_nsectors = 0; 248 max_ntracks = 0; 249 for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++) { 250 int ncyls; 251 int nsectors; 252 int ntracks; 253 254 ncyls = DPCYL(dp->dp_ecyl, dp->dp_esect) + 1; 255 if (max_ncyls < ncyls) 256 max_ncyls = ncyls; 257 nsectors = DPSECT(dp->dp_esect); 258 if (max_nsectors < nsectors) 259 max_nsectors = nsectors; 260 ntracks = dp->dp_ehd + 1; 261 if (max_ntracks < ntracks) 262 max_ntracks = ntracks; 263 } 264 265 /* 266 * Check that we have guessed the geometry right by checking the 267 * partition entries. 268 */ 269 /* 270 * TODO: 271 * As above. 272 * Check for overlaps. 273 * Check against d_secperunit if the latter is reliable. 274 */ 275 error = 0; 276 for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++) { 277 if (dp->dp_scyl == 0 && dp->dp_shd == 0 && dp->dp_ssect == 0 278 && dp->dp_start == 0 && dp->dp_size == 0) 279 continue; 280 sname = dsname(dev, dkunit(dev), BASE_SLICE + dospart, 281 RAW_PART, partname); 282 283 /* 284 * Temporarily ignore errors from this check. We could 285 * simplify things by accepting the table eariler if we 286 * always ignore errors here. Perhaps we should always 287 * accept the table if the magic is right but not let 288 * bad entries affect the geometry. 289 */ 290 check_part(sname, dp, mbr_offset, max_nsectors, max_ntracks, 291 mbr_offset); 292 } 293 if (error != 0) 294 goto done; 295 296 /* 297 * Accept the DOS partition table. 298 * First adjust the label (we have been careful not to change it 299 * before we can guarantee success). 300 */ 301 secpercyl = (u_long)max_nsectors * max_ntracks; 302 if (secpercyl != 0) { 303 #if 0 304 u_long secperunit; 305 #endif 306 307 lp->d_nsectors = max_nsectors; 308 lp->d_ntracks = max_ntracks; 309 lp->d_secpercyl = secpercyl; 310 /* 311 * Temporarily, don't even consider adjusting the drive's 312 * size, since the adjusted size may exceed the hardware's 313 * addressing capabilities. The adjustment helped mainly 314 * for ancient MFM drives with > 1024 cylinders, but now 315 * breaks at least IDE drives with 63*16*65536 sectors if 316 * they are controlled by the wd driver in CHS mode. 317 */ 318 #if 0 319 secperunit = secpercyl * max_ncyls; 320 if (lp->d_secperunit < secperunit) 321 lp->d_secperunit = secperunit; 322 #endif 323 lp->d_ncylinders = lp->d_secperunit / secpercyl; 324 } 325 326 /* 327 * We are passed a pointer to a suitably initialized minimal 328 * slices "struct" with no dangling pointers in it. Replace it 329 * by a maximal one. This usually oversizes the "struct", but 330 * enlarging it while searching for logical drives would be 331 * inconvenient. 332 */ 333 free(*sspp, M_DEVBUF); 334 ssp = dsmakeslicestruct(MAX_SLICES, lp); 335 *sspp = ssp; 336 337 /* Initialize normal slices. */ 338 sp = &ssp->dss_slices[BASE_SLICE]; 339 for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++, sp++) { 340 sname = dsname(dev, dkunit(dev), BASE_SLICE + dospart, 341 RAW_PART, partname); 342 (void)mbr_setslice(sname, lp, sp, dp, mbr_offset); 343 } 344 ssp->dss_nslices = BASE_SLICE + NDOSPART; 345 346 /* Handle extended partitions. */ 347 sp -= NDOSPART; 348 for (dospart = 0; dospart < NDOSPART; dospart++, sp++) 349 if (sp->ds_type == DOSPTYP_EXTENDED || 350 sp->ds_type == DOSPTYP_EXTENDEDX) 351 mbr_extended(bp->b_dev, lp, ssp, 352 sp->ds_offset, sp->ds_size, sp->ds_offset, 353 max_nsectors, max_ntracks, mbr_offset, 1); 354 355 /* 356 * mbr_extended() abuses ssp->dss_nslices for the number of slices 357 * that would be found if there were no limit on the number of slices 358 * in *ssp. Cut it back now. 359 */ 360 if (ssp->dss_nslices > MAX_SLICES) 361 ssp->dss_nslices = MAX_SLICES; 362 363 done: 364 bp->b_flags |= B_INVAL | B_AGE; 365 brelse(bp); 366 if (error == EINVAL) 367 error = 0; 368 return (error); 369 } 370 371 void 372 mbr_extended(dev, lp, ssp, ext_offset, ext_size, base_ext_offset, nsectors, 373 ntracks, mbr_offset, level) 374 dev_t dev; 375 struct disklabel *lp; 376 struct diskslices *ssp; 377 u_long ext_offset; 378 u_long ext_size; 379 u_long base_ext_offset; 380 int nsectors; 381 int ntracks; 382 u_long mbr_offset; 383 int level; 384 { 385 struct buf *bp; 386 u_char *cp; 387 int dospart; 388 struct dos_partition *dp; 389 struct dos_partition dpcopy[NDOSPART]; 390 u_long ext_offsets[NDOSPART]; 391 u_long ext_sizes[NDOSPART]; 392 char partname[2]; 393 int slice; 394 char *sname; 395 struct diskslice *sp; 396 397 if (level >= 16) { 398 printf( 399 "%s: excessive recursion in search for slices; aborting search\n", 400 devtoname(dev)); 401 return; 402 } 403 404 /* Read extended boot record. */ 405 bp = geteblk((int)lp->d_secsize); 406 bp->b_dev = dev; 407 bp->b_blkno = ext_offset; 408 bp->b_bcount = lp->d_secsize; 409 bp->b_flags |= B_READ; 410 BUF_STRATEGY(bp, 1); 411 if (biowait(bp) != 0) { 412 diskerr(bp, "reading extended partition table: error", 413 LOG_PRINTF, 0, (struct disklabel *)NULL); 414 printf("\n"); 415 goto done; 416 } 417 418 /* Weakly verify it. */ 419 cp = bp->b_data; 420 if (cp[0x1FE] != 0x55 || cp[0x1FF] != 0xAA) { 421 sname = dsname(dev, dkunit(dev), WHOLE_DISK_SLICE, RAW_PART, 422 partname); 423 if (bootverbose) 424 printf("%s: invalid extended partition table: no magic\n", 425 sname); 426 goto done; 427 } 428 429 /* Make a copy of the partition table to avoid alignment problems. */ 430 memcpy(&dpcopy[0], cp + DOSPARTOFF, sizeof(dpcopy)); 431 432 slice = ssp->dss_nslices; 433 for (dospart = 0, dp = &dpcopy[0]; dospart < NDOSPART; 434 dospart++, dp++) { 435 ext_sizes[dospart] = 0; 436 if (dp->dp_scyl == 0 && dp->dp_shd == 0 && dp->dp_ssect == 0 437 && dp->dp_start == 0 && dp->dp_size == 0) 438 continue; 439 if (dp->dp_typ == DOSPTYP_EXTENDED || 440 dp->dp_typ == DOSPTYP_EXTENDEDX) { 441 static char buf[32]; 442 443 sname = dsname(dev, dkunit(dev), WHOLE_DISK_SLICE, 444 RAW_PART, partname); 445 snprintf(buf, sizeof(buf), "%s", sname); 446 if (strlen(buf) < sizeof buf - 11) 447 strcat(buf, "<extended>"); 448 check_part(buf, dp, base_ext_offset, nsectors, 449 ntracks, mbr_offset); 450 ext_offsets[dospart] = base_ext_offset + dp->dp_start; 451 ext_sizes[dospart] = dp->dp_size; 452 } else { 453 sname = dsname(dev, dkunit(dev), slice, RAW_PART, 454 partname); 455 check_part(sname, dp, ext_offset, nsectors, ntracks, 456 mbr_offset); 457 if (slice >= MAX_SLICES) { 458 printf("%s: too many slices\n", sname); 459 slice++; 460 continue; 461 } 462 sp = &ssp->dss_slices[slice]; 463 if (mbr_setslice(sname, lp, sp, dp, ext_offset) != 0) 464 continue; 465 slice++; 466 } 467 } 468 ssp->dss_nslices = slice; 469 470 /* If we found any more slices, recursively find all the subslices. */ 471 for (dospart = 0; dospart < NDOSPART; dospart++) 472 if (ext_sizes[dospart] != 0) 473 mbr_extended(dev, lp, ssp, ext_offsets[dospart], 474 ext_sizes[dospart], base_ext_offset, 475 nsectors, ntracks, mbr_offset, ++level); 476 477 done: 478 bp->b_flags |= B_INVAL | B_AGE; 479 brelse(bp); 480 } 481 482 static int 483 mbr_setslice(sname, lp, sp, dp, br_offset) 484 char *sname; 485 struct disklabel *lp; 486 struct diskslice *sp; 487 struct dos_partition *dp; 488 u_long br_offset; 489 { 490 u_long offset; 491 u_long size; 492 493 offset = br_offset + dp->dp_start; 494 if (offset > lp->d_secperunit || offset < br_offset) { 495 printf( 496 "%s: slice starts beyond end of the disk: rejecting it\n", 497 sname); 498 return (1); 499 } 500 size = lp->d_secperunit - offset; 501 if (size >= dp->dp_size) 502 size = dp->dp_size; 503 else 504 printf( 505 "%s: slice extends beyond end of disk: truncating from %lu to %lu sectors\n", 506 sname, (u_long)dp->dp_size, size); 507 sp->ds_offset = offset; 508 sp->ds_size = size; 509 sp->ds_type = dp->dp_typ; 510 #ifdef PC98_ATCOMPAT 511 /* Fake FreeBSD(98). */ 512 if (sp->ds_type == DOSPTYP_386BSD) 513 sp->ds_type = 0x94; 514 #endif 515 #if 0 516 lp->d_subtype |= (lp->d_subtype & 3) | dospart | DSTYPE_INDOSPART; 517 #endif 518 return (0); 519 } 520 521 #ifdef __alpha__ 522 void 523 alpha_fix_srm_checksum(bp) 524 struct buf *bp; 525 { 526 u_int64_t *p; 527 u_int64_t sum; 528 int i; 529 530 p = (u_int64_t *) bp->b_data; 531 sum = 0; 532 for (i = 0; i < 63; i++) 533 sum += p[i]; 534 p[63] = sum; 535 } 536 #endif 537