part.c revision 239325
1/*- 2 * Copyright (c) 2012 Andrey V. Elsukov <ae@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: head/sys/boot/common/part.c 239325 2012-08-16 06:45:58Z ae $"); 29 30#include <stand.h> 31#include <sys/param.h> 32#include <sys/diskmbr.h> 33#include <sys/disklabel.h> 34#include <sys/endian.h> 35#include <sys/gpt.h> 36#include <sys/stddef.h> 37#include <sys/queue.h> 38#include <sys/vtoc.h> 39 40#include <crc32.h> 41#include <part.h> 42#include <uuid.h> 43 44#ifdef PART_DEBUG 45#define DEBUG(fmt, args...) printf("%s: " fmt "\n" , __func__ , ## args) 46#else 47#define DEBUG(fmt, args...) 48#endif 49 50#ifdef LOADER_GPT_SUPPORT 51#define MAXTBLSZ 64 52static const uuid_t gpt_uuid_unused = GPT_ENT_TYPE_UNUSED; 53static const uuid_t gpt_uuid_ms_basic_data = GPT_ENT_TYPE_MS_BASIC_DATA; 54static const uuid_t gpt_uuid_freebsd_ufs = GPT_ENT_TYPE_FREEBSD_UFS; 55static const uuid_t gpt_uuid_efi = GPT_ENT_TYPE_EFI; 56static const uuid_t gpt_uuid_freebsd_boot = GPT_ENT_TYPE_FREEBSD_BOOT; 57static const uuid_t gpt_uuid_freebsd_nandfs = GPT_ENT_TYPE_FREEBSD_NANDFS; 58static const uuid_t gpt_uuid_freebsd_swap = GPT_ENT_TYPE_FREEBSD_SWAP; 59static const uuid_t gpt_uuid_freebsd_zfs = GPT_ENT_TYPE_FREEBSD_ZFS; 60static const uuid_t gpt_uuid_freebsd_vinum = GPT_ENT_TYPE_FREEBSD_VINUM; 61#endif 62 63struct pentry { 64 struct ptable_entry part; 65 uint64_t flags; 66 union { 67 uint8_t bsd; 68 uint8_t mbr; 69 uuid_t gpt; 70 uint16_t vtoc8; 71 } type; 72 STAILQ_ENTRY(pentry) entry; 73}; 74 75struct ptable { 76 enum ptable_type type; 77 uint16_t sectorsize; 78 uint64_t sectors; 79 80 STAILQ_HEAD(, pentry) entries; 81}; 82 83static struct parttypes { 84 enum partition_type type; 85 const char *desc; 86} ptypes[] = { 87 { PART_UNKNOWN, "Unknown" }, 88 { PART_EFI, "EFI" }, 89 { PART_FREEBSD, "FreeBSD" }, 90 { PART_FREEBSD_BOOT, "FreeBSD boot" }, 91 { PART_FREEBSD_NANDFS, "FreeBSD nandfs" }, 92 { PART_FREEBSD_UFS, "FreeBSD UFS" }, 93 { PART_FREEBSD_ZFS, "FreeBSD ZFS" }, 94 { PART_FREEBSD_SWAP, "FreeBSD swap" }, 95 { PART_FREEBSD_VINUM, "FreeBSD vinum" }, 96 { PART_LINUX, "Linux" }, 97 { PART_LINUX_SWAP, "Linux swap" }, 98 { PART_DOS, "DOS/Windows" }, 99}; 100 101const char * 102parttype2str(enum partition_type type) 103{ 104 int i; 105 106 for (i = 0; i < sizeof(ptypes) / sizeof(ptypes[0]); i++) 107 if (ptypes[i].type == type) 108 return (ptypes[i].desc); 109 return (ptypes[0].desc); 110} 111 112#ifdef LOADER_GPT_SUPPORT 113static void 114uuid_letoh(uuid_t *uuid) 115{ 116 117 uuid->time_low = le32toh(uuid->time_low); 118 uuid->time_mid = le16toh(uuid->time_mid); 119 uuid->time_hi_and_version = le16toh(uuid->time_hi_and_version); 120} 121 122static enum partition_type 123gpt_parttype(uuid_t type) 124{ 125 126 if (uuid_equal(&type, &gpt_uuid_efi, NULL)) 127 return (PART_EFI); 128 else if (uuid_equal(&type, &gpt_uuid_ms_basic_data, NULL)) 129 return (PART_DOS); 130 else if (uuid_equal(&type, &gpt_uuid_freebsd_boot, NULL)) 131 return (PART_FREEBSD_BOOT); 132 else if (uuid_equal(&type, &gpt_uuid_freebsd_ufs, NULL)) 133 return (PART_FREEBSD_UFS); 134 else if (uuid_equal(&type, &gpt_uuid_freebsd_zfs, NULL)) 135 return (PART_FREEBSD_ZFS); 136 else if (uuid_equal(&type, &gpt_uuid_freebsd_swap, NULL)) 137 return (PART_FREEBSD_SWAP); 138 else if (uuid_equal(&type, &gpt_uuid_freebsd_vinum, NULL)) 139 return (PART_FREEBSD_VINUM); 140 else if (uuid_equal(&type, &gpt_uuid_freebsd_nandfs, NULL)) 141 return (PART_FREEBSD_NANDFS); 142 return (PART_UNKNOWN); 143} 144 145static struct gpt_hdr* 146gpt_checkhdr(struct gpt_hdr *hdr, uint64_t lba_self, uint64_t lba_last, 147 uint16_t sectorsize) 148{ 149 uint32_t sz, crc; 150 151 if (memcmp(hdr->hdr_sig, GPT_HDR_SIG, sizeof(hdr->hdr_sig)) != 0) { 152 DEBUG("no GPT signature"); 153 return (NULL); 154 } 155 sz = le32toh(hdr->hdr_size); 156 if (sz < 92 || sz > sectorsize) { 157 DEBUG("invalid GPT header size: %d", sz); 158 return (NULL); 159 } 160 crc = le32toh(hdr->hdr_crc_self); 161 hdr->hdr_crc_self = 0; 162 if (crc32(hdr, sz) != crc) { 163 DEBUG("GPT header's CRC doesn't match"); 164 return (NULL); 165 } 166 hdr->hdr_crc_self = crc; 167 hdr->hdr_revision = le32toh(hdr->hdr_revision); 168 if (hdr->hdr_revision < GPT_HDR_REVISION) { 169 DEBUG("unsupported GPT revision %d", hdr->hdr_revision); 170 return (NULL); 171 } 172 hdr->hdr_lba_self = le64toh(hdr->hdr_lba_self); 173 if (hdr->hdr_lba_self != lba_self) { 174 DEBUG("self LBA doesn't match"); 175 return (NULL); 176 } 177 hdr->hdr_lba_alt = le64toh(hdr->hdr_lba_alt); 178 if (hdr->hdr_lba_alt == hdr->hdr_lba_self) { 179 DEBUG("invalid alternate LBA"); 180 return (NULL); 181 } 182 hdr->hdr_entries = le32toh(hdr->hdr_entries); 183 hdr->hdr_entsz = le32toh(hdr->hdr_entsz); 184 if (hdr->hdr_entries < 128 || 185 hdr->hdr_entsz < sizeof(struct gpt_ent) || 186 sectorsize % hdr->hdr_entsz != 0) { 187 DEBUG("invalid entry size or number of entries"); 188 return (NULL); 189 } 190 hdr->hdr_lba_start = le64toh(hdr->hdr_lba_start); 191 hdr->hdr_lba_end = le64toh(hdr->hdr_lba_end); 192 hdr->hdr_lba_table = le64toh(hdr->hdr_lba_table); 193 hdr->hdr_crc_table = le32toh(hdr->hdr_crc_table); 194 uuid_letoh(&hdr->hdr_uuid); 195 return (hdr); 196} 197 198static int 199gpt_checktbl(const struct gpt_hdr *hdr, u_char *tbl, size_t size, 200 uint64_t lba_last) 201{ 202 struct gpt_ent *ent; 203 int i, cnt; 204 205 cnt = size / hdr->hdr_entsz; 206 /* Check CRC only when buffer size is enough for table. */ 207 if (hdr->hdr_entries <= cnt && 208 crc32(tbl, size) != hdr->hdr_crc_table) { 209 DEBUG("GPT table's CRC doesn't match"); 210 return (-1); 211 } 212 ent = (struct gpt_ent *)tbl; 213 for (i = 0; i < cnt; i++, ent++) { 214 uuid_letoh(&ent->ent_type); 215 if (uuid_equal(&ent->ent_type, &gpt_uuid_unused, NULL)) 216 continue; 217 ent->ent_lba_start = le64toh(ent->ent_lba_start); 218 ent->ent_lba_end = le64toh(ent->ent_lba_end); 219 } 220 return (0); 221} 222 223static struct ptable* 224ptable_gptread(struct ptable *table, void *dev, diskread_t dread) 225{ 226 struct pentry *entry; 227 struct gpt_hdr *phdr, hdr; 228 struct gpt_ent *ent; 229 u_char *buf, *tbl; 230 uint64_t offset; 231 int pri, sec, i; 232 size_t size; 233 234 buf = malloc(table->sectorsize); 235 if (buf == NULL) 236 return (NULL); 237 tbl = malloc(table->sectorsize * MAXTBLSZ); 238 if (tbl == NULL) { 239 free(buf); 240 return (NULL); 241 } 242 /* Read the primary GPT header. */ 243 if (dread(dev, buf, 1, 1) != 0) { 244 ptable_close(table); 245 table = NULL; 246 goto out; 247 } 248 pri = sec = 0; 249 /* Check the primary GPT header. */ 250 phdr = gpt_checkhdr((struct gpt_hdr *)buf, 1, table->sectors - 1, 251 table->sectorsize); 252 if (phdr != NULL) { 253 /* Read the primary GPT table. */ 254 size = MIN(MAXTBLSZ, 255 phdr->hdr_entries * phdr->hdr_entsz / table->sectorsize); 256 if (dread(dev, tbl, size, phdr->hdr_lba_table) == 0 && 257 gpt_checktbl(phdr, tbl, size * table->sectorsize, 258 table->sectors - 1) == 0) { 259 memcpy(&hdr, phdr, sizeof(hdr)); 260 pri = 1; 261 } 262 } 263 offset = pri ? hdr.hdr_lba_alt: table->sectors - 1; 264 /* Read the backup GPT header. */ 265 if (dread(dev, buf, 1, offset) != 0) 266 phdr = NULL; 267 else 268 phdr = gpt_checkhdr((struct gpt_hdr *)buf, offset, 269 table->sectors - 1, table->sectorsize); 270 if (phdr != NULL) { 271 /* 272 * Compare primary and backup headers. 273 * If they are equal, then we do not need to read backup 274 * table. If they are different, then prefer backup header 275 * and try to read backup table. 276 */ 277 if (pri == 0 || 278 uuid_equal(&hdr.hdr_uuid, &phdr->hdr_uuid, NULL) == 0 || 279 hdr.hdr_revision != phdr->hdr_revision || 280 hdr.hdr_size != phdr->hdr_size || 281 hdr.hdr_lba_start != phdr->hdr_lba_start || 282 hdr.hdr_lba_end != phdr->hdr_lba_end || 283 hdr.hdr_entries != phdr->hdr_entries || 284 hdr.hdr_entsz != phdr->hdr_entsz || 285 hdr.hdr_crc_table != phdr->hdr_crc_table) { 286 /* Read the backup GPT table. */ 287 size = MIN(MAXTBLSZ, phdr->hdr_entries * 288 phdr->hdr_entsz / table->sectorsize); 289 if (dread(dev, tbl, size, phdr->hdr_lba_table) == 0 && 290 gpt_checktbl(phdr, tbl, size * table->sectorsize, 291 table->sectors - 1) == 0) { 292 memcpy(&hdr, phdr, sizeof(hdr)); 293 sec = 1; 294 } 295 } 296 } 297 if (pri == 0 && sec == 0) { 298 /* Both primary and backup tables are invalid. */ 299 table->type = PTABLE_NONE; 300 goto out; 301 } 302 ent = (struct gpt_ent *)tbl; 303 size = MIN(hdr.hdr_entries * hdr.hdr_entsz, 304 MAXTBLSZ * table->sectorsize); 305 for (i = 0; i < size / hdr.hdr_entsz; i++, ent++) { 306 if (uuid_equal(&ent->ent_type, &gpt_uuid_unused, NULL)) 307 continue; 308 entry = malloc(sizeof(*entry)); 309 if (entry == NULL) 310 break; 311 entry->part.start = ent->ent_lba_start; 312 entry->part.end = ent->ent_lba_end; 313 entry->part.index = i + 1; 314 entry->part.type = gpt_parttype(ent->ent_type); 315 entry->flags = le64toh(ent->ent_attr); 316 memcpy(&entry->type.gpt, &ent->ent_type, sizeof(uuid_t)); 317 STAILQ_INSERT_TAIL(&table->entries, entry, entry); 318 DEBUG("new GPT partition added"); 319 } 320out: 321 free(buf); 322 free(tbl); 323 return (table); 324} 325#endif /* LOADER_GPT_SUPPORT */ 326 327#ifdef LOADER_MBR_SUPPORT 328/* We do not need to support too many EBR partitions in the loader */ 329#define MAXEBRENTRIES 8 330static enum partition_type 331mbr_parttype(uint8_t type) 332{ 333 334 switch (type) { 335 case DOSPTYP_386BSD: 336 return (PART_FREEBSD); 337 case DOSPTYP_LINSWP: 338 return (PART_LINUX_SWAP); 339 case DOSPTYP_LINUX: 340 return (PART_LINUX); 341 case 0x01: 342 case 0x04: 343 case 0x06: 344 case 0x07: 345 case 0x0b: 346 case 0x0c: 347 case 0x0e: 348 return (PART_DOS); 349 } 350 return (PART_UNKNOWN); 351} 352 353struct ptable* 354ptable_ebrread(struct ptable *table, void *dev, diskread_t dread) 355{ 356 struct dos_partition *dp; 357 struct pentry *e1, *entry; 358 uint32_t start, end, offset; 359 u_char *buf; 360 int i, index; 361 362 STAILQ_FOREACH(e1, &table->entries, entry) { 363 if (e1->type.mbr == DOSPTYP_EXT || 364 e1->type.mbr == DOSPTYP_EXTLBA) 365 break; 366 } 367 if (e1 == NULL) 368 return (table); 369 index = 5; 370 offset = e1->part.start; 371 buf = malloc(table->sectorsize); 372 if (buf == NULL) 373 return (table); 374 for (i = 0; i < MAXEBRENTRIES; i++) { 375#if 0 /* Some BIOSes return an incorrect number of sectors */ 376 if (offset >= table->sectors) 377 break; 378#endif 379 if (dread(dev, buf, 1, offset) != 0) 380 break; 381 dp = (struct dos_partition *)(buf + DOSPARTOFF); 382 if (dp[0].dp_typ == 0) 383 break; 384 start = le32toh(dp[0].dp_start); 385 if (dp[0].dp_typ == DOSPTYP_EXT && 386 dp[1].dp_typ == 0) { 387 offset = e1->part.start + start; 388 continue; 389 } 390 end = le32toh(dp[0].dp_size); 391 entry = malloc(sizeof(*entry)); 392 if (entry == NULL) 393 break; 394 entry->part.start = offset + start; 395 entry->part.end = entry->part.start + end - 1; 396 entry->part.index = index++; 397 entry->part.type = mbr_parttype(dp[0].dp_typ); 398 entry->flags = dp[0].dp_flag; 399 entry->type.mbr = dp[0].dp_typ; 400 STAILQ_INSERT_TAIL(&table->entries, entry, entry); 401 DEBUG("new EBR partition added"); 402 if (dp[1].dp_typ == 0) 403 break; 404 offset = e1->part.start + le32toh(dp[1].dp_start); 405 } 406 free(buf); 407 return (table); 408} 409#endif /* LOADER_MBR_SUPPORT */ 410 411static enum partition_type 412bsd_parttype(uint8_t type) 413{ 414 415 switch (type) { 416 case FS_NANDFS: 417 return (PART_FREEBSD_NANDFS); 418 case FS_SWAP: 419 return (PART_FREEBSD_SWAP); 420 case FS_BSDFFS: 421 return (PART_FREEBSD_UFS); 422 case FS_VINUM: 423 return (PART_FREEBSD_VINUM); 424 case FS_ZFS: 425 return (PART_FREEBSD_ZFS); 426 } 427 return (PART_UNKNOWN); 428} 429 430struct ptable* 431ptable_bsdread(struct ptable *table, void *dev, diskread_t dread) 432{ 433 struct disklabel *dl; 434 struct partition *part; 435 struct pentry *entry; 436 u_char *buf; 437 uint32_t raw_offset; 438 int i; 439 440 if (table->sectorsize < sizeof(struct disklabel)) { 441 DEBUG("Too small sectorsize"); 442 return (table); 443 } 444 buf = malloc(table->sectorsize); 445 if (buf == NULL) 446 return (table); 447 if (dread(dev, buf, 1, 1) != 0) { 448 DEBUG("read failed"); 449 ptable_close(table); 450 table = NULL; 451 goto out; 452 } 453 dl = (struct disklabel *)buf; 454 if (le32toh(dl->d_magic) != DISKMAGIC && 455 le32toh(dl->d_magic2) != DISKMAGIC) 456 goto out; 457 if (le32toh(dl->d_secsize) != table->sectorsize) { 458 DEBUG("unsupported sector size"); 459 goto out; 460 } 461 dl->d_npartitions = le16toh(dl->d_npartitions); 462 if (dl->d_npartitions > 20 || dl->d_npartitions < 8) { 463 DEBUG("invalid number of partitions"); 464 goto out; 465 } 466 part = &dl->d_partitions[0]; 467 raw_offset = le32toh(part[RAW_PART].p_offset); 468 for (i = 0; i < dl->d_npartitions; i++, part++) { 469 if (i == RAW_PART) 470 continue; 471 if (part->p_size == 0) 472 continue; 473 entry = malloc(sizeof(*entry)); 474 if (entry == NULL) 475 break; 476 entry->part.start = le32toh(part->p_offset) - raw_offset; 477 entry->part.end = entry->part.start + 478 le32toh(part->p_size) + 1; 479 entry->part.type = bsd_parttype(part->p_fstype); 480 entry->part.index = i; /* starts from zero */ 481 entry->type.bsd = part->p_fstype; 482 STAILQ_INSERT_TAIL(&table->entries, entry, entry); 483 DEBUG("new BSD partition added"); 484 } 485 table->type = PTABLE_BSD; 486out: 487 free(buf); 488 return (table); 489} 490 491#ifdef LOADER_VTOC8_SUPPORT 492static enum partition_type 493vtoc8_parttype(uint16_t type) 494{ 495 496 switch (type) { 497 case VTOC_TAG_FREEBSD_NANDFS: 498 return (PART_FREEBSD_NANDFS); 499 case VTOC_TAG_FREEBSD_SWAP: 500 return (PART_FREEBSD_SWAP); 501 case VTOC_TAG_FREEBSD_UFS: 502 return (PART_FREEBSD_UFS); 503 case VTOC_TAG_FREEBSD_VINUM: 504 return (PART_FREEBSD_VINUM); 505 case VTOC_TAG_FREEBSD_ZFS: 506 return (PART_FREEBSD_ZFS); 507 }; 508 return (PART_UNKNOWN); 509} 510 511static struct ptable* 512ptable_vtoc8read(struct ptable *table, void *dev, diskread_t dread) 513{ 514 struct pentry *entry; 515 struct vtoc8 *dl; 516 u_char *buf; 517 uint16_t sum, heads, sectors; 518 int i; 519 520 if (table->sectorsize != sizeof(struct vtoc8)) 521 return (table); 522 buf = malloc(table->sectorsize); 523 if (buf == NULL) 524 return (table); 525 if (dread(dev, buf, 1, 0) != 0) { 526 DEBUG("read failed"); 527 ptable_close(table); 528 table = NULL; 529 goto out; 530 } 531 dl = (struct vtoc8 *)buf; 532 /* Check the sum */ 533 for (i = sum = 0; i < sizeof(struct vtoc8); i += sizeof(sum)) 534 sum ^= be16dec(buf + i); 535 if (sum != 0) { 536 DEBUG("incorrect checksum"); 537 goto out; 538 } 539 if (be16toh(dl->nparts) != VTOC8_NPARTS) { 540 DEBUG("invalid number of entries"); 541 goto out; 542 } 543 sectors = be16toh(dl->nsecs); 544 heads = be16toh(dl->nheads); 545 if (sectors * heads == 0) { 546 DEBUG("invalid geometry"); 547 goto out; 548 } 549 for (i = 0; i < VTOC8_NPARTS; i++) { 550 dl->part[i].tag = be16toh(dl->part[i].tag); 551 if (i == VTOC_RAW_PART || 552 dl->part[i].tag == VTOC_TAG_UNASSIGNED) 553 continue; 554 entry = malloc(sizeof(*entry)); 555 if (entry == NULL) 556 break; 557 entry->part.start = be32toh(dl->map[i].cyl) * heads * sectors; 558 entry->part.end = be32toh(dl->map[i].nblks) + 559 entry->part.start - 1; 560 entry->part.type = vtoc8_parttype(dl->part[i].tag); 561 entry->part.index = i; /* starts from zero */ 562 entry->type.vtoc8 = dl->part[i].tag; 563 STAILQ_INSERT_TAIL(&table->entries, entry, entry); 564 DEBUG("new VTOC8 partition added"); 565 } 566 table->type = PTABLE_VTOC8; 567out: 568 free(buf); 569 return (table); 570 571} 572#endif /* LOADER_VTOC8_SUPPORT */ 573 574struct ptable* 575ptable_open(void *dev, off_t sectors, uint16_t sectorsize, 576 diskread_t *dread) 577{ 578 struct dos_partition *dp; 579 struct ptable *table; 580 u_char *buf; 581 int i, count; 582#ifdef LOADER_MBR_SUPPORT 583 struct pentry *entry; 584 uint32_t start, end; 585 int has_ext; 586#endif 587 table = NULL; 588 buf = malloc(sectorsize); 589 if (buf == NULL) 590 return (NULL); 591 /* First, read the MBR. */ 592 if (dread(dev, buf, 1, DOSBBSECTOR) != 0) { 593 DEBUG("read failed"); 594 goto out; 595 } 596 597 table = malloc(sizeof(*table)); 598 if (table == NULL) 599 goto out; 600 table->sectors = sectors; 601 table->sectorsize = sectorsize; 602 table->type = PTABLE_NONE; 603 STAILQ_INIT(&table->entries); 604 605#ifdef LOADER_VTOC8_SUPPORT 606 if (be16dec(buf + offsetof(struct vtoc8, magic)) == VTOC_MAGIC) { 607 if (ptable_vtoc8read(table, dev, dread) == NULL) { 608 /* Read error. */ 609 table = NULL; 610 goto out; 611 } else if (table->type == PTABLE_VTOC8) 612 goto out; 613 } 614#endif 615 /* Check the BSD label. */ 616 if (ptable_bsdread(table, dev, dread) == NULL) { /* Read error. */ 617 table = NULL; 618 goto out; 619 } else if (table->type == PTABLE_BSD) 620 goto out; 621 622#if defined(LOADER_GPT_SUPPORT) || defined(LOADER_MBR_SUPPORT) 623 /* Check the MBR magic. */ 624 if (buf[DOSMAGICOFFSET] != 0x55 || 625 buf[DOSMAGICOFFSET + 1] != 0xaa) { 626 DEBUG("magic sequence not found"); 627 goto out; 628 } 629 /* Check that we have PMBR. Also do some validation. */ 630 dp = (struct dos_partition *)(buf + DOSPARTOFF); 631 for (i = 0, count = 0; i < NDOSPART; i++) { 632 if (dp[i].dp_flag != 0 && dp[i].dp_flag != 0x80) { 633 DEBUG("invalid partition flag %x", dp[i].dp_flag); 634 break; 635 } 636#ifdef LOADER_GPT_SUPPORT 637 if (dp[i].dp_typ == DOSPTYP_PMBR) { 638 table->type = PTABLE_GPT; 639 DEBUG("PMBR detected"); 640 } 641#endif 642 if (dp[i].dp_typ != 0) 643 count++; 644 } 645 /* Do we have some invalid values? */ 646 if (i != NDOSPART || 647 (table->type == PTABLE_GPT && count > 1)) { 648 table->type = PTABLE_NONE; 649 DEBUG("invalid values detected, ignore partition table"); 650 goto out; 651 } 652#ifdef LOADER_GPT_SUPPORT 653 if (table->type == PTABLE_GPT) { 654 table = ptable_gptread(table, dev, dread); 655 goto out; 656 } 657#endif 658#ifdef LOADER_MBR_SUPPORT 659 /* Read MBR. */ 660 table->type = PTABLE_MBR; 661 for (i = has_ext = 0; i < NDOSPART; i++) { 662 if (dp[i].dp_typ == 0) 663 continue; 664 start = le32toh(dp[i].dp_start); 665 end = le32toh(dp[i].dp_size); 666 if (start == 0 || end == 0) 667 continue; 668#if 0 /* Some BIOSes return an incorrect number of sectors */ 669 if (start + end - 1 >= sectors) 670 continue; /* XXX: ignore */ 671#endif 672 if (dp[i].dp_typ == DOSPTYP_EXT || 673 dp[i].dp_typ == DOSPTYP_EXTLBA) 674 has_ext = 1; 675 entry = malloc(sizeof(*entry)); 676 if (entry == NULL) 677 break; 678 entry->part.start = start; 679 entry->part.end = start + end - 1; 680 entry->part.index = i + 1; 681 entry->part.type = mbr_parttype(dp[i].dp_typ); 682 entry->flags = dp[i].dp_flag; 683 entry->type.mbr = dp[i].dp_typ; 684 STAILQ_INSERT_TAIL(&table->entries, entry, entry); 685 DEBUG("new MBR partition added"); 686 } 687 if (has_ext) { 688 table = ptable_ebrread(table, dev, dread); 689 /* FALLTHROUGH */ 690 } 691#endif /* LOADER_MBR_SUPPORT */ 692#endif /* LOADER_MBR_SUPPORT || LOADER_GPT_SUPPORT */ 693out: 694 free(buf); 695 return (table); 696} 697 698void 699ptable_close(struct ptable *table) 700{ 701 struct pentry *entry; 702 703 while (!STAILQ_EMPTY(&table->entries)) { 704 entry = STAILQ_FIRST(&table->entries); 705 STAILQ_REMOVE_HEAD(&table->entries, entry); 706 free(entry); 707 } 708 free(table); 709} 710 711enum ptable_type 712ptable_gettype(const struct ptable *table) 713{ 714 715 return (table->type); 716} 717 718int 719ptable_getpart(const struct ptable *table, struct ptable_entry *part, int index) 720{ 721 struct pentry *entry; 722 723 if (part == NULL || table == NULL) 724 return (EINVAL); 725 726 STAILQ_FOREACH(entry, &table->entries, entry) { 727 if (entry->part.index != index) 728 continue; 729 memcpy(part, &entry->part, sizeof(*part)); 730 return (0); 731 } 732 return (ENOENT); 733} 734 735/* 736 * Search for a slice with the following preferences: 737 * 738 * 1: Active FreeBSD slice 739 * 2: Non-active FreeBSD slice 740 * 3: Active Linux slice 741 * 4: non-active Linux slice 742 * 5: Active FAT/FAT32 slice 743 * 6: non-active FAT/FAT32 slice 744 */ 745#define PREF_RAWDISK 0 746#define PREF_FBSD_ACT 1 747#define PREF_FBSD 2 748#define PREF_LINUX_ACT 3 749#define PREF_LINUX 4 750#define PREF_DOS_ACT 5 751#define PREF_DOS 6 752#define PREF_NONE 7 753int 754ptable_getbestpart(const struct ptable *table, struct ptable_entry *part) 755{ 756 struct pentry *entry, *best; 757 int pref, preflevel; 758 759 if (part == NULL || table == NULL) 760 return (EINVAL); 761 762 best = NULL; 763 preflevel = pref = PREF_NONE; 764 STAILQ_FOREACH(entry, &table->entries, entry) { 765#ifdef LOADER_MBR_SUPPORT 766 if (table->type == PTABLE_MBR) { 767 switch (entry->type.mbr) { 768 case DOSPTYP_386BSD: 769 pref = entry->flags & 0x80 ? PREF_FBSD_ACT: 770 PREF_FBSD; 771 break; 772 case DOSPTYP_LINUX: 773 pref = entry->flags & 0x80 ? PREF_LINUX_ACT: 774 PREF_LINUX; 775 break; 776 case 0x01: /* DOS/Windows */ 777 case 0x04: 778 case 0x06: 779 case 0x0c: 780 case 0x0e: 781 case DOSPTYP_FAT32: 782 pref = entry->flags & 0x80 ? PREF_DOS_ACT: 783 PREF_DOS; 784 break; 785 default: 786 pref = PREF_NONE; 787 } 788 } 789#endif /* LOADER_MBR_SUPPORT */ 790#ifdef LOADER_GPT_SUPPORT 791 if (table->type == PTABLE_GPT) { 792 if (entry->part.type == PART_DOS) 793 pref = PREF_DOS; 794 else if (entry->part.type == PART_FREEBSD_UFS || 795 entry->part.type == PART_FREEBSD_ZFS) 796 pref = PREF_FBSD; 797 else 798 pref = PREF_NONE; 799 } 800#endif /* LOADER_GPT_SUPPORT */ 801 if (pref < preflevel) { 802 preflevel = pref; 803 best = entry; 804 } 805 } 806 if (best != NULL) { 807 memcpy(part, &best->part, sizeof(*part)); 808 return (0); 809 } 810 return (ENOENT); 811} 812 813void 814ptable_iterate(const struct ptable *table, void *arg, ptable_iterate_t *iter) 815{ 816 struct pentry *entry; 817 char name[32]; 818 819 name[0] = '\0'; 820 STAILQ_FOREACH(entry, &table->entries, entry) { 821#ifdef LOADER_MBR_SUPPORT 822 if (table->type == PTABLE_MBR) 823 sprintf(name, "s%d", entry->part.index); 824 else 825#endif 826#ifdef LOADER_GPT_SUPPORT 827 if (table->type == PTABLE_GPT) 828 sprintf(name, "p%d", entry->part.index); 829 else 830#endif 831#ifdef LOADER_VTOC8_SUPPORT 832 if (table->type == PTABLE_VTOC8) 833 sprintf(name, "%c", (u_char) 'a' + 834 entry->part.index); 835 else 836#endif 837 if (table->type == PTABLE_BSD) 838 sprintf(name, "%c", (u_char) 'a' + 839 entry->part.index); 840 iter(arg, name, &entry->part); 841 } 842} 843 844