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