part.c revision 272933
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: stable/10/sys/boot/common/part.c 272933 2014-10-11 06:04:44Z 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 = GPT_ENT_TYPE_FREEBSD; 57static const uuid_t gpt_uuid_freebsd_boot = GPT_ENT_TYPE_FREEBSD_BOOT; 58static const uuid_t gpt_uuid_freebsd_nandfs = GPT_ENT_TYPE_FREEBSD_NANDFS; 59static const uuid_t gpt_uuid_freebsd_swap = GPT_ENT_TYPE_FREEBSD_SWAP; 60static const uuid_t gpt_uuid_freebsd_zfs = GPT_ENT_TYPE_FREEBSD_ZFS; 61static const uuid_t gpt_uuid_freebsd_vinum = GPT_ENT_TYPE_FREEBSD_VINUM; 62#endif 63 64struct pentry { 65 struct ptable_entry part; 66 uint64_t flags; 67 union { 68 uint8_t bsd; 69 uint8_t mbr; 70 uuid_t gpt; 71 uint16_t vtoc8; 72 } type; 73 STAILQ_ENTRY(pentry) entry; 74}; 75 76struct ptable { 77 enum ptable_type type; 78 uint16_t sectorsize; 79 uint64_t sectors; 80 81 STAILQ_HEAD(, pentry) entries; 82}; 83 84static struct parttypes { 85 enum partition_type type; 86 const char *desc; 87} ptypes[] = { 88 { PART_UNKNOWN, "Unknown" }, 89 { PART_EFI, "EFI" }, 90 { PART_FREEBSD, "FreeBSD" }, 91 { PART_FREEBSD_BOOT, "FreeBSD boot" }, 92 { PART_FREEBSD_NANDFS, "FreeBSD nandfs" }, 93 { PART_FREEBSD_UFS, "FreeBSD UFS" }, 94 { PART_FREEBSD_ZFS, "FreeBSD ZFS" }, 95 { PART_FREEBSD_SWAP, "FreeBSD swap" }, 96 { PART_FREEBSD_VINUM, "FreeBSD vinum" }, 97 { PART_LINUX, "Linux" }, 98 { PART_LINUX_SWAP, "Linux swap" }, 99 { PART_DOS, "DOS/Windows" }, 100}; 101 102const char * 103parttype2str(enum partition_type type) 104{ 105 int i; 106 107 for (i = 0; i < sizeof(ptypes) / sizeof(ptypes[0]); i++) 108 if (ptypes[i].type == type) 109 return (ptypes[i].desc); 110 return (ptypes[0].desc); 111} 112 113#ifdef LOADER_GPT_SUPPORT 114static void 115uuid_letoh(uuid_t *uuid) 116{ 117 118 uuid->time_low = le32toh(uuid->time_low); 119 uuid->time_mid = le16toh(uuid->time_mid); 120 uuid->time_hi_and_version = le16toh(uuid->time_hi_and_version); 121} 122 123static enum partition_type 124gpt_parttype(uuid_t type) 125{ 126 127 if (uuid_equal(&type, &gpt_uuid_efi, NULL)) 128 return (PART_EFI); 129 else if (uuid_equal(&type, &gpt_uuid_ms_basic_data, NULL)) 130 return (PART_DOS); 131 else if (uuid_equal(&type, &gpt_uuid_freebsd_boot, NULL)) 132 return (PART_FREEBSD_BOOT); 133 else if (uuid_equal(&type, &gpt_uuid_freebsd_ufs, NULL)) 134 return (PART_FREEBSD_UFS); 135 else if (uuid_equal(&type, &gpt_uuid_freebsd_zfs, NULL)) 136 return (PART_FREEBSD_ZFS); 137 else if (uuid_equal(&type, &gpt_uuid_freebsd_swap, NULL)) 138 return (PART_FREEBSD_SWAP); 139 else if (uuid_equal(&type, &gpt_uuid_freebsd_vinum, NULL)) 140 return (PART_FREEBSD_VINUM); 141 else if (uuid_equal(&type, &gpt_uuid_freebsd_nandfs, NULL)) 142 return (PART_FREEBSD_NANDFS); 143 else if (uuid_equal(&type, &gpt_uuid_freebsd, NULL)) 144 return (PART_FREEBSD); 145 return (PART_UNKNOWN); 146} 147 148static struct gpt_hdr* 149gpt_checkhdr(struct gpt_hdr *hdr, uint64_t lba_self, uint64_t lba_last, 150 uint16_t sectorsize) 151{ 152 uint32_t sz, crc; 153 154 if (memcmp(hdr->hdr_sig, GPT_HDR_SIG, sizeof(hdr->hdr_sig)) != 0) { 155 DEBUG("no GPT signature"); 156 return (NULL); 157 } 158 sz = le32toh(hdr->hdr_size); 159 if (sz < 92 || sz > sectorsize) { 160 DEBUG("invalid GPT header size: %d", sz); 161 return (NULL); 162 } 163 crc = le32toh(hdr->hdr_crc_self); 164 hdr->hdr_crc_self = 0; 165 if (crc32(hdr, sz) != crc) { 166 DEBUG("GPT header's CRC doesn't match"); 167 return (NULL); 168 } 169 hdr->hdr_crc_self = crc; 170 hdr->hdr_revision = le32toh(hdr->hdr_revision); 171 if (hdr->hdr_revision < GPT_HDR_REVISION) { 172 DEBUG("unsupported GPT revision %d", hdr->hdr_revision); 173 return (NULL); 174 } 175 hdr->hdr_lba_self = le64toh(hdr->hdr_lba_self); 176 if (hdr->hdr_lba_self != lba_self) { 177 DEBUG("self LBA doesn't match"); 178 return (NULL); 179 } 180 hdr->hdr_lba_alt = le64toh(hdr->hdr_lba_alt); 181 if (hdr->hdr_lba_alt == hdr->hdr_lba_self) { 182 DEBUG("invalid alternate LBA"); 183 return (NULL); 184 } 185 hdr->hdr_entries = le32toh(hdr->hdr_entries); 186 hdr->hdr_entsz = le32toh(hdr->hdr_entsz); 187 if (hdr->hdr_entries == 0 || 188 hdr->hdr_entsz < sizeof(struct gpt_ent) || 189 sectorsize % hdr->hdr_entsz != 0) { 190 DEBUG("invalid entry size or number of entries"); 191 return (NULL); 192 } 193 hdr->hdr_lba_start = le64toh(hdr->hdr_lba_start); 194 hdr->hdr_lba_end = le64toh(hdr->hdr_lba_end); 195 hdr->hdr_lba_table = le64toh(hdr->hdr_lba_table); 196 hdr->hdr_crc_table = le32toh(hdr->hdr_crc_table); 197 uuid_letoh(&hdr->hdr_uuid); 198 return (hdr); 199} 200 201static int 202gpt_checktbl(const struct gpt_hdr *hdr, u_char *tbl, size_t size, 203 uint64_t lba_last) 204{ 205 struct gpt_ent *ent; 206 int i, cnt; 207 208 cnt = size / hdr->hdr_entsz; 209 if (hdr->hdr_entries <= cnt) { 210 cnt = hdr->hdr_entries; 211 /* Check CRC only when buffer size is enough for table. */ 212 if (hdr->hdr_crc_table != 213 crc32(tbl, hdr->hdr_entries * hdr->hdr_entsz)) { 214 DEBUG("GPT table's CRC doesn't match"); 215 return (-1); 216 } 217 } 218 for (i = 0; i < cnt; i++) { 219 ent = (struct gpt_ent *)(tbl + i * hdr->hdr_entsz); 220 uuid_letoh(&ent->ent_type); 221 if (uuid_equal(&ent->ent_type, &gpt_uuid_unused, NULL)) 222 continue; 223 ent->ent_lba_start = le64toh(ent->ent_lba_start); 224 ent->ent_lba_end = le64toh(ent->ent_lba_end); 225 } 226 return (0); 227} 228 229static struct ptable* 230ptable_gptread(struct ptable *table, void *dev, diskread_t dread) 231{ 232 struct pentry *entry; 233 struct gpt_hdr *phdr, hdr; 234 struct gpt_ent *ent; 235 u_char *buf, *tbl; 236 uint64_t offset; 237 int pri, sec, i; 238 size_t size; 239 240 buf = malloc(table->sectorsize); 241 if (buf == NULL) 242 return (NULL); 243 tbl = malloc(table->sectorsize * MAXTBLSZ); 244 if (tbl == NULL) { 245 free(buf); 246 return (NULL); 247 } 248 /* Read the primary GPT header. */ 249 if (dread(dev, buf, 1, 1) != 0) { 250 ptable_close(table); 251 table = NULL; 252 goto out; 253 } 254 pri = sec = 0; 255 /* Check the primary GPT header. */ 256 phdr = gpt_checkhdr((struct gpt_hdr *)buf, 1, table->sectors - 1, 257 table->sectorsize); 258 if (phdr != NULL) { 259 /* Read the primary GPT table. */ 260 size = MIN(MAXTBLSZ, (phdr->hdr_entries * phdr->hdr_entsz + 261 table->sectorsize - 1) / table->sectorsize); 262 if (dread(dev, tbl, size, phdr->hdr_lba_table) == 0 && 263 gpt_checktbl(phdr, tbl, size * table->sectorsize, 264 table->sectors - 1) == 0) { 265 memcpy(&hdr, phdr, sizeof(hdr)); 266 pri = 1; 267 } 268 } 269 offset = pri ? hdr.hdr_lba_alt: table->sectors - 1; 270 /* Read the backup GPT header. */ 271 if (dread(dev, buf, 1, offset) != 0) 272 phdr = NULL; 273 else 274 phdr = gpt_checkhdr((struct gpt_hdr *)buf, offset, 275 table->sectors - 1, table->sectorsize); 276 if (phdr != NULL) { 277 /* 278 * Compare primary and backup headers. 279 * If they are equal, then we do not need to read backup 280 * table. If they are different, then prefer backup header 281 * and try to read backup table. 282 */ 283 if (pri == 0 || 284 uuid_equal(&hdr.hdr_uuid, &phdr->hdr_uuid, NULL) == 0 || 285 hdr.hdr_revision != phdr->hdr_revision || 286 hdr.hdr_size != phdr->hdr_size || 287 hdr.hdr_lba_start != phdr->hdr_lba_start || 288 hdr.hdr_lba_end != phdr->hdr_lba_end || 289 hdr.hdr_entries != phdr->hdr_entries || 290 hdr.hdr_entsz != phdr->hdr_entsz || 291 hdr.hdr_crc_table != phdr->hdr_crc_table) { 292 /* Read the backup GPT table. */ 293 size = MIN(MAXTBLSZ, (phdr->hdr_entries * 294 phdr->hdr_entsz + table->sectorsize - 1) / 295 table->sectorsize); 296 if (dread(dev, tbl, size, phdr->hdr_lba_table) == 0 && 297 gpt_checktbl(phdr, tbl, size * table->sectorsize, 298 table->sectors - 1) == 0) { 299 memcpy(&hdr, phdr, sizeof(hdr)); 300 sec = 1; 301 } 302 } 303 } 304 if (pri == 0 && sec == 0) { 305 /* Both primary and backup tables are invalid. */ 306 table->type = PTABLE_NONE; 307 goto out; 308 } 309 size = MIN(hdr.hdr_entries * hdr.hdr_entsz, 310 MAXTBLSZ * table->sectorsize); 311 for (i = 0; i < size / hdr.hdr_entsz; i++) { 312 ent = (struct gpt_ent *)(tbl + i * hdr.hdr_entsz); 313 if (uuid_equal(&ent->ent_type, &gpt_uuid_unused, NULL)) 314 continue; 315 entry = malloc(sizeof(*entry)); 316 if (entry == NULL) 317 break; 318 entry->part.start = ent->ent_lba_start; 319 entry->part.end = ent->ent_lba_end; 320 entry->part.index = i + 1; 321 entry->part.type = gpt_parttype(ent->ent_type); 322 entry->flags = le64toh(ent->ent_attr); 323 memcpy(&entry->type.gpt, &ent->ent_type, sizeof(uuid_t)); 324 STAILQ_INSERT_TAIL(&table->entries, entry, entry); 325 DEBUG("new GPT partition added"); 326 } 327out: 328 free(buf); 329 free(tbl); 330 return (table); 331} 332#endif /* LOADER_GPT_SUPPORT */ 333 334#ifdef LOADER_MBR_SUPPORT 335/* We do not need to support too many EBR partitions in the loader */ 336#define MAXEBRENTRIES 8 337static enum partition_type 338mbr_parttype(uint8_t type) 339{ 340 341 switch (type) { 342 case DOSPTYP_386BSD: 343 return (PART_FREEBSD); 344 case DOSPTYP_LINSWP: 345 return (PART_LINUX_SWAP); 346 case DOSPTYP_LINUX: 347 return (PART_LINUX); 348 case 0x01: 349 case 0x04: 350 case 0x06: 351 case 0x07: 352 case 0x0b: 353 case 0x0c: 354 case 0x0e: 355 return (PART_DOS); 356 } 357 return (PART_UNKNOWN); 358} 359 360struct ptable* 361ptable_ebrread(struct ptable *table, void *dev, diskread_t dread) 362{ 363 struct dos_partition *dp; 364 struct pentry *e1, *entry; 365 uint32_t start, end, offset; 366 u_char *buf; 367 int i, index; 368 369 STAILQ_FOREACH(e1, &table->entries, entry) { 370 if (e1->type.mbr == DOSPTYP_EXT || 371 e1->type.mbr == DOSPTYP_EXTLBA) 372 break; 373 } 374 if (e1 == NULL) 375 return (table); 376 index = 5; 377 offset = e1->part.start; 378 buf = malloc(table->sectorsize); 379 if (buf == NULL) 380 return (table); 381 for (i = 0; i < MAXEBRENTRIES; i++) { 382#if 0 /* Some BIOSes return an incorrect number of sectors */ 383 if (offset >= table->sectors) 384 break; 385#endif 386 if (dread(dev, buf, 1, offset) != 0) 387 break; 388 dp = (struct dos_partition *)(buf + DOSPARTOFF); 389 if (dp[0].dp_typ == 0) 390 break; 391 start = le32toh(dp[0].dp_start); 392 if (dp[0].dp_typ == DOSPTYP_EXT && 393 dp[1].dp_typ == 0) { 394 offset = e1->part.start + start; 395 continue; 396 } 397 end = le32toh(dp[0].dp_size); 398 entry = malloc(sizeof(*entry)); 399 if (entry == NULL) 400 break; 401 entry->part.start = offset + start; 402 entry->part.end = entry->part.start + end - 1; 403 entry->part.index = index++; 404 entry->part.type = mbr_parttype(dp[0].dp_typ); 405 entry->flags = dp[0].dp_flag; 406 entry->type.mbr = dp[0].dp_typ; 407 STAILQ_INSERT_TAIL(&table->entries, entry, entry); 408 DEBUG("new EBR partition added"); 409 if (dp[1].dp_typ == 0) 410 break; 411 offset = e1->part.start + le32toh(dp[1].dp_start); 412 } 413 free(buf); 414 return (table); 415} 416#endif /* LOADER_MBR_SUPPORT */ 417 418static enum partition_type 419bsd_parttype(uint8_t type) 420{ 421 422 switch (type) { 423 case FS_NANDFS: 424 return (PART_FREEBSD_NANDFS); 425 case FS_SWAP: 426 return (PART_FREEBSD_SWAP); 427 case FS_BSDFFS: 428 return (PART_FREEBSD_UFS); 429 case FS_VINUM: 430 return (PART_FREEBSD_VINUM); 431 case FS_ZFS: 432 return (PART_FREEBSD_ZFS); 433 } 434 return (PART_UNKNOWN); 435} 436 437struct ptable* 438ptable_bsdread(struct ptable *table, void *dev, diskread_t dread) 439{ 440 struct disklabel *dl; 441 struct partition *part; 442 struct pentry *entry; 443 u_char *buf; 444 uint32_t raw_offset; 445 int i; 446 447 if (table->sectorsize < sizeof(struct disklabel)) { 448 DEBUG("Too small sectorsize"); 449 return (table); 450 } 451 buf = malloc(table->sectorsize); 452 if (buf == NULL) 453 return (table); 454 if (dread(dev, buf, 1, 1) != 0) { 455 DEBUG("read failed"); 456 ptable_close(table); 457 table = NULL; 458 goto out; 459 } 460 dl = (struct disklabel *)buf; 461 if (le32toh(dl->d_magic) != DISKMAGIC && 462 le32toh(dl->d_magic2) != DISKMAGIC) 463 goto out; 464 if (le32toh(dl->d_secsize) != table->sectorsize) { 465 DEBUG("unsupported sector size"); 466 goto out; 467 } 468 dl->d_npartitions = le16toh(dl->d_npartitions); 469 if (dl->d_npartitions > 20 || dl->d_npartitions < 8) { 470 DEBUG("invalid number of partitions"); 471 goto out; 472 } 473 part = &dl->d_partitions[0]; 474 raw_offset = le32toh(part[RAW_PART].p_offset); 475 for (i = 0; i < dl->d_npartitions; i++, part++) { 476 if (i == RAW_PART) 477 continue; 478 if (part->p_size == 0) 479 continue; 480 entry = malloc(sizeof(*entry)); 481 if (entry == NULL) 482 break; 483 entry->part.start = le32toh(part->p_offset) - raw_offset; 484 entry->part.end = entry->part.start + 485 le32toh(part->p_size) + 1; 486 entry->part.type = bsd_parttype(part->p_fstype); 487 entry->part.index = i; /* starts from zero */ 488 entry->type.bsd = part->p_fstype; 489 STAILQ_INSERT_TAIL(&table->entries, entry, entry); 490 DEBUG("new BSD partition added"); 491 } 492 table->type = PTABLE_BSD; 493out: 494 free(buf); 495 return (table); 496} 497 498#ifdef LOADER_VTOC8_SUPPORT 499static enum partition_type 500vtoc8_parttype(uint16_t type) 501{ 502 503 switch (type) { 504 case VTOC_TAG_FREEBSD_NANDFS: 505 return (PART_FREEBSD_NANDFS); 506 case VTOC_TAG_FREEBSD_SWAP: 507 return (PART_FREEBSD_SWAP); 508 case VTOC_TAG_FREEBSD_UFS: 509 return (PART_FREEBSD_UFS); 510 case VTOC_TAG_FREEBSD_VINUM: 511 return (PART_FREEBSD_VINUM); 512 case VTOC_TAG_FREEBSD_ZFS: 513 return (PART_FREEBSD_ZFS); 514 }; 515 return (PART_UNKNOWN); 516} 517 518static struct ptable* 519ptable_vtoc8read(struct ptable *table, void *dev, diskread_t dread) 520{ 521 struct pentry *entry; 522 struct vtoc8 *dl; 523 u_char *buf; 524 uint16_t sum, heads, sectors; 525 int i; 526 527 if (table->sectorsize != sizeof(struct vtoc8)) 528 return (table); 529 buf = malloc(table->sectorsize); 530 if (buf == NULL) 531 return (table); 532 if (dread(dev, buf, 1, 0) != 0) { 533 DEBUG("read failed"); 534 ptable_close(table); 535 table = NULL; 536 goto out; 537 } 538 dl = (struct vtoc8 *)buf; 539 /* Check the sum */ 540 for (i = sum = 0; i < sizeof(struct vtoc8); i += sizeof(sum)) 541 sum ^= be16dec(buf + i); 542 if (sum != 0) { 543 DEBUG("incorrect checksum"); 544 goto out; 545 } 546 if (be16toh(dl->nparts) != VTOC8_NPARTS) { 547 DEBUG("invalid number of entries"); 548 goto out; 549 } 550 sectors = be16toh(dl->nsecs); 551 heads = be16toh(dl->nheads); 552 if (sectors * heads == 0) { 553 DEBUG("invalid geometry"); 554 goto out; 555 } 556 for (i = 0; i < VTOC8_NPARTS; i++) { 557 dl->part[i].tag = be16toh(dl->part[i].tag); 558 if (i == VTOC_RAW_PART || 559 dl->part[i].tag == VTOC_TAG_UNASSIGNED) 560 continue; 561 entry = malloc(sizeof(*entry)); 562 if (entry == NULL) 563 break; 564 entry->part.start = be32toh(dl->map[i].cyl) * heads * sectors; 565 entry->part.end = be32toh(dl->map[i].nblks) + 566 entry->part.start - 1; 567 entry->part.type = vtoc8_parttype(dl->part[i].tag); 568 entry->part.index = i; /* starts from zero */ 569 entry->type.vtoc8 = dl->part[i].tag; 570 STAILQ_INSERT_TAIL(&table->entries, entry, entry); 571 DEBUG("new VTOC8 partition added"); 572 } 573 table->type = PTABLE_VTOC8; 574out: 575 free(buf); 576 return (table); 577 578} 579#endif /* LOADER_VTOC8_SUPPORT */ 580 581struct ptable* 582ptable_open(void *dev, off_t sectors, uint16_t sectorsize, 583 diskread_t *dread) 584{ 585 struct dos_partition *dp; 586 struct ptable *table; 587 u_char *buf; 588 int i, count; 589#ifdef LOADER_MBR_SUPPORT 590 struct pentry *entry; 591 uint32_t start, end; 592 int has_ext; 593#endif 594 table = NULL; 595 buf = malloc(sectorsize); 596 if (buf == NULL) 597 return (NULL); 598 /* First, read the MBR. */ 599 if (dread(dev, buf, 1, DOSBBSECTOR) != 0) { 600 DEBUG("read failed"); 601 goto out; 602 } 603 604 table = malloc(sizeof(*table)); 605 if (table == NULL) 606 goto out; 607 table->sectors = sectors; 608 table->sectorsize = sectorsize; 609 table->type = PTABLE_NONE; 610 STAILQ_INIT(&table->entries); 611 612#ifdef LOADER_VTOC8_SUPPORT 613 if (be16dec(buf + offsetof(struct vtoc8, magic)) == VTOC_MAGIC) { 614 if (ptable_vtoc8read(table, dev, dread) == NULL) { 615 /* Read error. */ 616 table = NULL; 617 goto out; 618 } else if (table->type == PTABLE_VTOC8) 619 goto out; 620 } 621#endif 622 /* Check the BSD label. */ 623 if (ptable_bsdread(table, dev, dread) == NULL) { /* Read error. */ 624 table = NULL; 625 goto out; 626 } else if (table->type == PTABLE_BSD) 627 goto out; 628 629#if defined(LOADER_GPT_SUPPORT) || defined(LOADER_MBR_SUPPORT) 630 /* Check the MBR magic. */ 631 if (buf[DOSMAGICOFFSET] != 0x55 || 632 buf[DOSMAGICOFFSET + 1] != 0xaa) { 633 DEBUG("magic sequence not found"); 634 goto out; 635 } 636 /* Check that we have PMBR. Also do some validation. */ 637 dp = (struct dos_partition *)(buf + DOSPARTOFF); 638 for (i = 0, count = 0; i < NDOSPART; i++) { 639 if (dp[i].dp_flag != 0 && dp[i].dp_flag != 0x80) { 640 DEBUG("invalid partition flag %x", dp[i].dp_flag); 641 goto out; 642 } 643#ifdef LOADER_GPT_SUPPORT 644 if (dp[i].dp_typ == DOSPTYP_PMBR) { 645 table->type = PTABLE_GPT; 646 DEBUG("PMBR detected"); 647 } 648#endif 649 if (dp[i].dp_typ != 0) 650 count++; 651 } 652 /* Do we have some invalid values? */ 653 if (table->type == PTABLE_GPT && count > 1) { 654 if (dp[1].dp_typ != DOSPTYP_HFS) { 655 table->type = PTABLE_NONE; 656 DEBUG("Incorrect PMBR, ignore it"); 657 } else 658 DEBUG("Bootcamp detected"); 659 } 660#ifdef LOADER_GPT_SUPPORT 661 if (table->type == PTABLE_GPT) { 662 table = ptable_gptread(table, dev, dread); 663 goto out; 664 } 665#endif 666#ifdef LOADER_MBR_SUPPORT 667 /* Read MBR. */ 668 table->type = PTABLE_MBR; 669 for (i = has_ext = 0; i < NDOSPART; i++) { 670 if (dp[i].dp_typ == 0) 671 continue; 672 start = le32dec(&(dp[i].dp_start)); 673 end = le32dec(&(dp[i].dp_size)); 674 if (start == 0 || end == 0) 675 continue; 676#if 0 /* Some BIOSes return an incorrect number of sectors */ 677 if (start + end - 1 >= sectors) 678 continue; /* XXX: ignore */ 679#endif 680 if (dp[i].dp_typ == DOSPTYP_EXT || 681 dp[i].dp_typ == DOSPTYP_EXTLBA) 682 has_ext = 1; 683 entry = malloc(sizeof(*entry)); 684 if (entry == NULL) 685 break; 686 entry->part.start = start; 687 entry->part.end = start + end - 1; 688 entry->part.index = i + 1; 689 entry->part.type = mbr_parttype(dp[i].dp_typ); 690 entry->flags = dp[i].dp_flag; 691 entry->type.mbr = dp[i].dp_typ; 692 STAILQ_INSERT_TAIL(&table->entries, entry, entry); 693 DEBUG("new MBR partition added"); 694 } 695 if (has_ext) { 696 table = ptable_ebrread(table, dev, dread); 697 /* FALLTHROUGH */ 698 } 699#endif /* LOADER_MBR_SUPPORT */ 700#endif /* LOADER_MBR_SUPPORT || LOADER_GPT_SUPPORT */ 701out: 702 free(buf); 703 return (table); 704} 705 706void 707ptable_close(struct ptable *table) 708{ 709 struct pentry *entry; 710 711 while (!STAILQ_EMPTY(&table->entries)) { 712 entry = STAILQ_FIRST(&table->entries); 713 STAILQ_REMOVE_HEAD(&table->entries, entry); 714 free(entry); 715 } 716 free(table); 717} 718 719enum ptable_type 720ptable_gettype(const struct ptable *table) 721{ 722 723 return (table->type); 724} 725 726int 727ptable_getpart(const struct ptable *table, struct ptable_entry *part, int index) 728{ 729 struct pentry *entry; 730 731 if (part == NULL || table == NULL) 732 return (EINVAL); 733 734 STAILQ_FOREACH(entry, &table->entries, entry) { 735 if (entry->part.index != index) 736 continue; 737 memcpy(part, &entry->part, sizeof(*part)); 738 return (0); 739 } 740 return (ENOENT); 741} 742 743/* 744 * Search for a slice with the following preferences: 745 * 746 * 1: Active FreeBSD slice 747 * 2: Non-active FreeBSD slice 748 * 3: Active Linux slice 749 * 4: non-active Linux slice 750 * 5: Active FAT/FAT32 slice 751 * 6: non-active FAT/FAT32 slice 752 */ 753#define PREF_RAWDISK 0 754#define PREF_FBSD_ACT 1 755#define PREF_FBSD 2 756#define PREF_LINUX_ACT 3 757#define PREF_LINUX 4 758#define PREF_DOS_ACT 5 759#define PREF_DOS 6 760#define PREF_NONE 7 761int 762ptable_getbestpart(const struct ptable *table, struct ptable_entry *part) 763{ 764 struct pentry *entry, *best; 765 int pref, preflevel; 766 767 if (part == NULL || table == NULL) 768 return (EINVAL); 769 770 best = NULL; 771 preflevel = pref = PREF_NONE; 772 STAILQ_FOREACH(entry, &table->entries, entry) { 773#ifdef LOADER_MBR_SUPPORT 774 if (table->type == PTABLE_MBR) { 775 switch (entry->type.mbr) { 776 case DOSPTYP_386BSD: 777 pref = entry->flags & 0x80 ? PREF_FBSD_ACT: 778 PREF_FBSD; 779 break; 780 case DOSPTYP_LINUX: 781 pref = entry->flags & 0x80 ? PREF_LINUX_ACT: 782 PREF_LINUX; 783 break; 784 case 0x01: /* DOS/Windows */ 785 case 0x04: 786 case 0x06: 787 case 0x0c: 788 case 0x0e: 789 case DOSPTYP_FAT32: 790 pref = entry->flags & 0x80 ? PREF_DOS_ACT: 791 PREF_DOS; 792 break; 793 default: 794 pref = PREF_NONE; 795 } 796 } 797#endif /* LOADER_MBR_SUPPORT */ 798#ifdef LOADER_GPT_SUPPORT 799 if (table->type == PTABLE_GPT) { 800 if (entry->part.type == PART_DOS) 801 pref = PREF_DOS; 802 else if (entry->part.type == PART_FREEBSD_UFS || 803 entry->part.type == PART_FREEBSD_ZFS) 804 pref = PREF_FBSD; 805 else 806 pref = PREF_NONE; 807 } 808#endif /* LOADER_GPT_SUPPORT */ 809 if (pref < preflevel) { 810 preflevel = pref; 811 best = entry; 812 } 813 } 814 if (best != NULL) { 815 memcpy(part, &best->part, sizeof(*part)); 816 return (0); 817 } 818 return (ENOENT); 819} 820 821void 822ptable_iterate(const struct ptable *table, void *arg, ptable_iterate_t *iter) 823{ 824 struct pentry *entry; 825 char name[32]; 826 827 name[0] = '\0'; 828 STAILQ_FOREACH(entry, &table->entries, entry) { 829#ifdef LOADER_MBR_SUPPORT 830 if (table->type == PTABLE_MBR) 831 sprintf(name, "s%d", entry->part.index); 832 else 833#endif 834#ifdef LOADER_GPT_SUPPORT 835 if (table->type == PTABLE_GPT) 836 sprintf(name, "p%d", entry->part.index); 837 else 838#endif 839#ifdef LOADER_VTOC8_SUPPORT 840 if (table->type == PTABLE_VTOC8) 841 sprintf(name, "%c", (u_char) 'a' + 842 entry->part.index); 843 else 844#endif 845 if (table->type == PTABLE_BSD) 846 sprintf(name, "%c", (u_char) 'a' + 847 entry->part.index); 848 iter(arg, name, &entry->part); 849 } 850} 851 852