sys/boot/common/part.c

   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("$FreeBSD$");
  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
  52 static const uuid_t gpt_uuid_unused = GPT_ENT_TYPE_UNUSED;
  53 static const uuid_t gpt_uuid_ms_basic_data = GPT_ENT_TYPE_MS_BASIC_DATA;
  54 static const uuid_t gpt_uuid_freebsd_ufs = GPT_ENT_TYPE_FREEBSD_UFS;
  55 static const uuid_t gpt_uuid_efi = GPT_ENT_TYPE_EFI;
  56 static const uuid_t gpt_uuid_freebsd = GPT_ENT_TYPE_FREEBSD;
  57 static const uuid_t gpt_uuid_freebsd_boot = GPT_ENT_TYPE_FREEBSD_BOOT;
  58 static const uuid_t gpt_uuid_freebsd_nandfs = GPT_ENT_TYPE_FREEBSD_NANDFS;
  59 static const uuid_t gpt_uuid_freebsd_swap = GPT_ENT_TYPE_FREEBSD_SWAP;
  60 static const uuid_t gpt_uuid_freebsd_zfs = GPT_ENT_TYPE_FREEBSD_ZFS;
  61 static const uuid_t gpt_uuid_freebsd_vinum = GPT_ENT_TYPE_FREEBSD_VINUM;
  62 #endif
  63
  64 struct 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
  76 struct ptable {
  77         enum ptable_type        type;
  78         uint16_t                sectorsize;
  79         uint64_t                sectors;
  80
  81         STAILQ_HEAD(, pentry)   entries;
  82 };
  83
  84 static 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
 102 const char *
 103 parttype2str(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
 114 static void
 115 uuid_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
 123 static enum partition_type
 124 gpt_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
 148 static struct gpt_hdr*
 149 gpt_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
 201 static int
 202 gpt_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
 229 static struct ptable*
 230 ptable_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         }
 327 out:
 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
 337 static enum partition_type
 338 mbr_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
 360 struct ptable*
 361 ptable_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
 418 static enum partition_type
 419 bsd_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
 437 struct ptable*
 438 ptable_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;
 493 out:
 494         free(buf);
 495         return (table);
 496 }
 497
 498 #ifdef LOADER_VTOC8_SUPPORT
 499 static enum partition_type
 500 vtoc8_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
 518 static struct ptable*
 519 ptable_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;
 574 out:
 575         free(buf);
 576         return (table);
 577
 578 }
 579 #endif /* LOADER_VTOC8_SUPPORT */
 580
 581 struct ptable*
 582 ptable_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 */
 701 out:
 702         free(buf);
 703         return (table);
 704 }
 705
 706 void
 707 ptable_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
 719 enum ptable_type
 720 ptable_gettype(const struct ptable *table)
 721 {
 722
 723         return (table->type);
 724 }
 725
 726 int
 727 ptable_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
 761 int
 762 ptable_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
 821 void
 822 ptable_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