lib/libefi/rdwr_efi.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
  24  */
  25
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <errno.h>
  29 #include <strings.h>
  30 #include <unistd.h>
  31 #include <uuid/uuid.h>
  32 #include <libintl.h>
  33 #include <sys/types.h>
  34 #include <sys/dkio.h>
  35 #include <sys/vtoc.h>
  36 #include <sys/mhd.h>
  37 #include <sys/param.h>
  38 #include <sys/dktp/fdisk.h>
  39 #include <sys/efi_partition.h>
  40 #include <sys/byteorder.h>
  41 #include <sys/ddi.h>
  42
  43 static struct uuid_to_ptag {
  44         struct uuid     uuid;
  45 } conversion_array[] = {
  46         { EFI_UNUSED },
  47         { EFI_BOOT },
  48         { EFI_ROOT },
  49         { EFI_SWAP },
  50         { EFI_USR },
  51         { EFI_BACKUP },
  52         { 0 },                  /* STAND is never used */
  53         { EFI_VAR },
  54         { EFI_HOME },
  55         { EFI_ALTSCTR },
  56         { 0 },                  /* CACHE (cachefs) is never used */
  57         { EFI_RESERVED },
  58         { EFI_SYSTEM },
  59         { EFI_LEGACY_MBR },
  60         { EFI_SYMC_PUB },
  61         { EFI_SYMC_CDS },
  62         { EFI_MSFT_RESV },
  63         { EFI_DELL_BASIC },
  64         { EFI_DELL_RAID },
  65         { EFI_DELL_SWAP },
  66         { EFI_DELL_LVM },
  67         { EFI_DELL_RESV },
  68         { EFI_AAPL_HFS },
  69         { EFI_AAPL_UFS }
  70 };
  71
  72 /*
  73  * Default vtoc information for non-SVr4 partitions
  74  */
  75 struct dk_map2  default_vtoc_map[NDKMAP] = {
  76         {       V_ROOT,         0       },              /* a - 0 */
  77         {       V_SWAP,         V_UNMNT },              /* b - 1 */
  78         {       V_BACKUP,       V_UNMNT },              /* c - 2 */
  79         {       V_UNASSIGNED,   0       },              /* d - 3 */
  80         {       V_UNASSIGNED,   0       },              /* e - 4 */
  81         {       V_UNASSIGNED,   0       },              /* f - 5 */
  82         {       V_USR,          0       },              /* g - 6 */
  83         {       V_UNASSIGNED,   0       },              /* h - 7 */
  84
  85 #if defined(_SUNOS_VTOC_16)
  86
  87 #if defined(i386) || defined(__amd64)
  88         {       V_BOOT,         V_UNMNT },              /* i - 8 */
  89         {       V_ALTSCTR,      0       },              /* j - 9 */
  90
  91 #else
  92 #error No VTOC format defined.
  93 #endif                  /* defined(i386) */
  94
  95         {       V_UNASSIGNED,   0       },              /* k - 10 */
  96         {       V_UNASSIGNED,   0       },              /* l - 11 */
  97         {       V_UNASSIGNED,   0       },              /* m - 12 */
  98         {       V_UNASSIGNED,   0       },              /* n - 13 */
  99         {       V_UNASSIGNED,   0       },              /* o - 14 */
 100         {       V_UNASSIGNED,   0       },              /* p - 15 */
 101 #endif                  /* defined(_SUNOS_VTOC_16) */
 102 };
 103
 104 #ifdef DEBUG
 105 int efi_debug = 1;
 106 #else
 107 int efi_debug = 0;
 108 #endif
 109
 110 extern unsigned int     efi_crc32(const unsigned char *, unsigned int);
 111 static int              efi_read(int, struct dk_gpt *);
 112
 113 static int
 114 read_disk_info(int fd, diskaddr_t *capacity, uint_t *lbsize)
 115 {
 116         struct dk_minfo         disk_info;
 117
 118         if ((ioctl(fd, DKIOCGMEDIAINFO, (caddr_t)&disk_info)) == -1)
 119                 return (errno);
 120         *capacity = disk_info.dki_capacity;
 121         *lbsize = disk_info.dki_lbsize;
 122         return (0);
 123 }
 124
 125 /*
 126  * the number of blocks the EFI label takes up (round up to nearest
 127  * block)
 128  */
 129 #define NBLOCKS(p, l)   (1 + ((((p) * (int)sizeof (efi_gpe_t))  + \
 130                                 ((l) - 1)) / (l)))
 131 /* number of partitions -- limited by what we can malloc */
 132 #define MAX_PARTS       ((4294967295UL - sizeof (struct dk_gpt)) / \
 133                             sizeof (struct dk_part))
 134
 135 int
 136 efi_alloc_and_init(int fd, uint32_t nparts, struct dk_gpt **vtoc)
 137 {
 138         diskaddr_t      capacity;
 139         uint_t          lbsize;
 140         uint_t          nblocks;
 141         size_t          length;
 142         struct dk_gpt   *vptr;
 143         struct uuid     uuid;
 144
 145         if (read_disk_info(fd, &capacity, &lbsize) != 0) {
 146                 if (efi_debug)
 147                         (void) fprintf(stderr,
 148                             "couldn't read disk information\n");
 149                 return (-1);
 150         }
 151
 152         nblocks = NBLOCKS(nparts, lbsize);
 153         if ((nblocks * lbsize) < EFI_MIN_ARRAY_SIZE + lbsize) {
 154                 /* 16K plus one block for the GPT */
 155                 nblocks = EFI_MIN_ARRAY_SIZE / lbsize + 1;
 156         }
 157
 158         if (nparts > MAX_PARTS) {
 159                 if (efi_debug) {
 160                         (void) fprintf(stderr,
 161                         "the maximum number of partitions supported is %lu\n",
 162                             MAX_PARTS);
 163                 }
 164                 return (-1);
 165         }
 166
 167         length = sizeof (struct dk_gpt) +
 168             sizeof (struct dk_part) * (nparts - 1);
 169
 170         if ((*vtoc = calloc(length, 1)) == NULL)
 171                 return (-1);
 172
 173         vptr = *vtoc;
 174
 175         vptr->efi_version = EFI_VERSION_CURRENT;
 176         vptr->efi_lbasize = lbsize;
 177         vptr->efi_nparts = nparts;
 178         /*
 179          * add one block here for the PMBR; on disks with a 512 byte
 180          * block size and 128 or fewer partitions, efi_first_u_lba
 181          * should work out to "34"
 182          */
 183         vptr->efi_first_u_lba = nblocks + 1;
 184         vptr->efi_last_lba = capacity - 1;
 185         vptr->efi_altern_lba = capacity -1;
 186         vptr->efi_last_u_lba = vptr->efi_last_lba - nblocks;
 187
 188         (void) uuid_generate((uchar_t *)&uuid);
 189         UUID_LE_CONVERT(vptr->efi_disk_uguid, uuid);
 190         return (0);
 191 }
 192
 193 /*
 194  * Read EFI - return partition number upon success.
 195  */
 196 int
 197 efi_alloc_and_read(int fd, struct dk_gpt **vtoc)
 198 {
 199         int                     rval;
 200         uint32_t                nparts;
 201         int                     length;
 202
 203         /* figure out the number of entries that would fit into 16K */
 204         nparts = EFI_MIN_ARRAY_SIZE / sizeof (efi_gpe_t);
 205         length = (int) sizeof (struct dk_gpt) +
 206             (int) sizeof (struct dk_part) * (nparts - 1);
 207         if ((*vtoc = calloc(length, 1)) == NULL)
 208                 return (VT_ERROR);
 209
 210         (*vtoc)->efi_nparts = nparts;
 211         rval = efi_read(fd, *vtoc);
 212
 213         if ((rval == VT_EINVAL) && (*vtoc)->efi_nparts > nparts) {
 214                 void *tmp;
 215                 length = (int) sizeof (struct dk_gpt) +
 216                     (int) sizeof (struct dk_part) *
 217                     ((*vtoc)->efi_nparts - 1);
 218                 nparts = (*vtoc)->efi_nparts;
 219                 if ((tmp = realloc(*vtoc, length)) == NULL) {
 220                         free (*vtoc);
 221                         *vtoc = NULL;
 222                         return (VT_ERROR);
 223                 } else {
 224                         *vtoc = tmp;
 225                         rval = efi_read(fd, *vtoc);
 226                 }
 227         }
 228
 229         if (rval < 0) {
 230                 if (efi_debug) {
 231                         (void) fprintf(stderr,
 232                             "read of EFI table failed, rval=%d\n", rval);
 233                 }
 234                 free (*vtoc);
 235                 *vtoc = NULL;
 236         }
 237
 238         return (rval);
 239 }
 240
 241 static int
 242 efi_ioctl(int fd, int cmd, dk_efi_t *dk_ioc)
 243 {
 244         void *data = dk_ioc->dki_data;
 245         int error;
 246
 247         dk_ioc->dki_data_64 = (uint64_t)(uintptr_t)data;
 248         error = ioctl(fd, cmd, (void *)dk_ioc);
 249         dk_ioc->dki_data = data;
 250
 251         return (error);
 252 }
 253
 254 static int
 255 check_label(int fd, dk_efi_t *dk_ioc)
 256 {
 257         efi_gpt_t               *efi;
 258         uint_t                  crc;
 259
 260         if (efi_ioctl(fd, DKIOCGETEFI, dk_ioc) == -1) {
 261                 switch (errno) {
 262                 case EIO:
 263                         return (VT_EIO);
 264                 default:
 265                         return (VT_ERROR);
 266                 }
 267         }
 268         efi = dk_ioc->dki_data;
 269         if (efi->efi_gpt_Signature != LE_64(EFI_SIGNATURE)) {
 270                 if (efi_debug)
 271                         (void) fprintf(stderr,
 272                             "Bad EFI signature: 0x%llx != 0x%llx\n",
 273                             (long long)efi->efi_gpt_Signature,
 274                             (long long)LE_64(EFI_SIGNATURE));
 275                 return (VT_EINVAL);
 276         }
 277
 278         /*
 279          * check CRC of the header; the size of the header should
 280          * never be larger than one block
 281          */
 282         crc = efi->efi_gpt_HeaderCRC32;
 283         efi->efi_gpt_HeaderCRC32 = 0;
 284
 285         if (((len_t)LE_32(efi->efi_gpt_HeaderSize) > dk_ioc->dki_length) ||
 286             crc != LE_32(efi_crc32((unsigned char *)efi,
 287             LE_32(efi->efi_gpt_HeaderSize)))) {
 288                 if (efi_debug)
 289                         (void) fprintf(stderr,
 290                             "Bad EFI CRC: 0x%x != 0x%x\n",
 291                             crc,
 292                             LE_32(efi_crc32((unsigned char *)efi,
 293                             sizeof (struct efi_gpt))));
 294                 return (VT_EINVAL);
 295         }
 296
 297         return (0);
 298 }
 299
 300 static int
 301 efi_read(int fd, struct dk_gpt *vtoc)
 302 {
 303         int                     i, j;
 304         int                     label_len;
 305         int                     rval = 0;
 306         int                     md_flag = 0;
 307         int                     vdc_flag = 0;
 308         struct dk_minfo         disk_info;
 309         dk_efi_t                dk_ioc;
 310         efi_gpt_t               *efi;
 311         efi_gpe_t               *efi_parts;
 312         struct dk_cinfo         dki_info;
 313         uint32_t                user_length;
 314         boolean_t               legacy_label = B_FALSE;
 315
 316         /*
 317          * get the partition number for this file descriptor.
 318          */
 319         if (ioctl(fd, DKIOCINFO, (caddr_t)&dki_info) == -1) {
 320                 if (efi_debug) {
 321                         (void) fprintf(stderr, "DKIOCINFO errno 0x%x\n", errno);
 322                 }
 323                 switch (errno) {
 324                 case EIO:
 325                         return (VT_EIO);
 326                 case EINVAL:
 327                         return (VT_EINVAL);
 328                 default:
 329                         return (VT_ERROR);
 330                 }
 331         }
 332         if ((strncmp(dki_info.dki_cname, "pseudo", 7) == 0) &&
 333             (strncmp(dki_info.dki_dname, "md", 3) == 0)) {
 334                 md_flag++;
 335         } else if ((strncmp(dki_info.dki_cname, "vdc", 4) == 0) &&
 336             (strncmp(dki_info.dki_dname, "vdc", 4) == 0)) {
 337                 /*
 338                  * The controller and drive name "vdc" (virtual disk client)
 339                  * indicates a LDoms virtual disk.
 340                  */
 341                 vdc_flag++;
 342         }
 343
 344         /* get the LBA size */
 345         if (ioctl(fd, DKIOCGMEDIAINFO, (caddr_t)&disk_info) == -1) {
 346                 if (efi_debug) {
 347                         (void) fprintf(stderr,
 348                             "assuming LBA 512 bytes %d\n",
 349                             errno);
 350                 }
 351                 disk_info.dki_lbsize = DEV_BSIZE;
 352         }
 353         if (disk_info.dki_lbsize == 0) {
 354                 if (efi_debug) {
 355                         (void) fprintf(stderr,
 356                             "efi_read: assuming LBA 512 bytes\n");
 357                 }
 358                 disk_info.dki_lbsize = DEV_BSIZE;
 359         }
 360         /*
 361          * Read the EFI GPT to figure out how many partitions we need
 362          * to deal with.
 363          */
 364         dk_ioc.dki_lba = 1;
 365         if (NBLOCKS(vtoc->efi_nparts, disk_info.dki_lbsize) < 34) {
 366                 label_len = EFI_MIN_ARRAY_SIZE + disk_info.dki_lbsize;
 367         } else {
 368                 label_len = vtoc->efi_nparts * (int) sizeof (efi_gpe_t) +
 369                     disk_info.dki_lbsize;
 370                 if (label_len % disk_info.dki_lbsize) {
 371                         /* pad to physical sector size */
 372                         label_len += disk_info.dki_lbsize;
 373                         label_len &= ~(disk_info.dki_lbsize - 1);
 374                 }
 375         }
 376
 377         if ((dk_ioc.dki_data = calloc(label_len, 1)) == NULL)
 378                 return (VT_ERROR);
 379
 380         dk_ioc.dki_length = disk_info.dki_lbsize;
 381         user_length = vtoc->efi_nparts;
 382         efi = dk_ioc.dki_data;
 383         if (md_flag) {
 384                 dk_ioc.dki_length = label_len;
 385                 if (efi_ioctl(fd, DKIOCGETEFI, &dk_ioc) == -1) {
 386                         switch (errno) {
 387                         case EIO:
 388                                 return (VT_EIO);
 389                         default:
 390                                 return (VT_ERROR);
 391                         }
 392                 }
 393         } else if ((rval = check_label(fd, &dk_ioc)) == VT_EINVAL) {
 394                 /*
 395                  * No valid label here; try the alternate. Note that here
 396                  * we just read GPT header and save it into dk_ioc.data,
 397                  * Later, we will read GUID partition entry array if we
 398                  * can get valid GPT header.
 399                  */
 400
 401                 /*
 402                  * This is a workaround for legacy systems. In the past, the
 403                  * last sector of SCSI disk was invisible on x86 platform. At
 404                  * that time, backup label was saved on the next to the last
 405                  * sector. It is possible for users to move a disk from previous
 406                  * solaris system to present system. Here, we attempt to search
 407                  * legacy backup EFI label first.
 408                  */
 409                 dk_ioc.dki_lba = disk_info.dki_capacity - 2;
 410                 dk_ioc.dki_length = disk_info.dki_lbsize;
 411                 rval = check_label(fd, &dk_ioc);
 412                 if (rval == VT_EINVAL) {
 413                         /*
 414                          * we didn't find legacy backup EFI label, try to
 415                          * search backup EFI label in the last block.
 416                          */
 417                         dk_ioc.dki_lba = disk_info.dki_capacity - 1;
 418                         dk_ioc.dki_length = disk_info.dki_lbsize;
 419                         rval = check_label(fd, &dk_ioc);
 420                         if (rval == 0) {
 421                                 legacy_label = B_TRUE;
 422                                 if (efi_debug)
 423                                         (void) fprintf(stderr,
 424                                             "efi_read: primary label corrupt; "
 425                                             "using EFI backup label located on"
 426                                             " the last block\n");
 427                         }
 428                 } else {
 429                         if ((efi_debug) && (rval == 0))
 430                                 (void) fprintf(stderr, "efi_read: primary label"
 431                                     " corrupt; using legacy EFI backup label "
 432                                     " located on the next to last block\n");
 433                 }
 434
 435                 if (rval == 0) {
 436                         dk_ioc.dki_lba = LE_64(efi->efi_gpt_PartitionEntryLBA);
 437                         vtoc->efi_flags |= EFI_GPT_PRIMARY_CORRUPT;
 438                         vtoc->efi_nparts =
 439                             LE_32(efi->efi_gpt_NumberOfPartitionEntries);
 440                         /*
 441                          * Partition tables are between backup GPT header
 442                          * table and ParitionEntryLBA (the starting LBA of
 443                          * the GUID partition entries array). Now that we
 444                          * already got valid GPT header and saved it in
 445                          * dk_ioc.dki_data, we try to get GUID partition
 446                          * entry array here.
 447                          */
 448                         /* LINTED */
 449                         dk_ioc.dki_data = (efi_gpt_t *)((char *)dk_ioc.dki_data
 450                             + disk_info.dki_lbsize);
 451                         if (legacy_label)
 452                                 dk_ioc.dki_length = disk_info.dki_capacity - 1 -
 453                                     dk_ioc.dki_lba;
 454                         else
 455                                 dk_ioc.dki_length = disk_info.dki_capacity - 2 -
 456                                     dk_ioc.dki_lba;
 457                         dk_ioc.dki_length *= disk_info.dki_lbsize;
 458                         if (dk_ioc.dki_length >
 459                             ((len_t)label_len - sizeof (*dk_ioc.dki_data))) {
 460                                 rval = VT_EINVAL;
 461                         } else {
 462                                 /*
 463                                  * read GUID partition entry array
 464                                  */
 465                                 rval = efi_ioctl(fd, DKIOCGETEFI, &dk_ioc);
 466                         }
 467                 }
 468
 469         } else if (rval == 0) {
 470
 471                 dk_ioc.dki_lba = LE_64(efi->efi_gpt_PartitionEntryLBA);
 472                 /* LINTED */
 473                 dk_ioc.dki_data = (efi_gpt_t *)((char *)dk_ioc.dki_data
 474                     + disk_info.dki_lbsize);
 475                 dk_ioc.dki_length = label_len - disk_info.dki_lbsize;
 476                 rval = efi_ioctl(fd, DKIOCGETEFI, &dk_ioc);
 477
 478         } else if (vdc_flag && rval == VT_ERROR && errno == EINVAL) {
 479                 /*
 480                  * When the device is a LDoms virtual disk, the DKIOCGETEFI
 481                  * ioctl can fail with EINVAL if the virtual disk backend
 482                  * is a ZFS volume serviced by a domain running an old version
 483                  * of Solaris. This is because the DKIOCGETEFI ioctl was
 484                  * initially incorrectly implemented for a ZFS volume and it
 485                  * expected the GPT and GPE to be retrieved with a single ioctl.
 486                  * So we try to read the GPT and the GPE using that old style
 487                  * ioctl.
 488                  */
 489                 dk_ioc.dki_lba = 1;
 490                 dk_ioc.dki_length = label_len;
 491                 rval = check_label(fd, &dk_ioc);
 492         }
 493
 494         if (rval < 0) {
 495                 free(efi);
 496                 return (rval);
 497         }
 498
 499         /* LINTED -- always longlong aligned */
 500         efi_parts = (efi_gpe_t *)(((char *)efi) + disk_info.dki_lbsize);
 501
 502         /*
 503          * Assemble this into a "dk_gpt" struct for easier
 504          * digestibility by applications.
 505          */
 506         vtoc->efi_version = LE_32(efi->efi_gpt_Revision);
 507         vtoc->efi_nparts = LE_32(efi->efi_gpt_NumberOfPartitionEntries);
 508         vtoc->efi_part_size = LE_32(efi->efi_gpt_SizeOfPartitionEntry);
 509         vtoc->efi_lbasize = disk_info.dki_lbsize;
 510         vtoc->efi_last_lba = disk_info.dki_capacity - 1;
 511         vtoc->efi_first_u_lba = LE_64(efi->efi_gpt_FirstUsableLBA);
 512         vtoc->efi_last_u_lba = LE_64(efi->efi_gpt_LastUsableLBA);
 513         vtoc->efi_altern_lba = LE_64(efi->efi_gpt_AlternateLBA);
 514         UUID_LE_CONVERT(vtoc->efi_disk_uguid, efi->efi_gpt_DiskGUID);
 515
 516         /*
 517          * If the array the user passed in is too small, set the length
 518          * to what it needs to be and return
 519          */
 520         if (user_length < vtoc->efi_nparts) {
 521                 return (VT_EINVAL);
 522         }
 523
 524         for (i = 0; i < vtoc->efi_nparts; i++) {
 525
 526                 UUID_LE_CONVERT(vtoc->efi_parts[i].p_guid,
 527                     efi_parts[i].efi_gpe_PartitionTypeGUID);
 528
 529                 for (j = 0;
 530                     j < sizeof (conversion_array)
 531                     / sizeof (struct uuid_to_ptag); j++) {
 532
 533                         if (bcmp(&vtoc->efi_parts[i].p_guid,
 534                             &conversion_array[j].uuid,
 535                             sizeof (struct uuid)) == 0) {
 536                                 vtoc->efi_parts[i].p_tag = j;
 537                                 break;
 538                         }
 539                 }
 540                 if (vtoc->efi_parts[i].p_tag == V_UNASSIGNED)
 541                         continue;
 542                 vtoc->efi_parts[i].p_flag =
 543                     LE_16(efi_parts[i].efi_gpe_Attributes.PartitionAttrs);
 544                 vtoc->efi_parts[i].p_start =
 545                     LE_64(efi_parts[i].efi_gpe_StartingLBA);
 546                 vtoc->efi_parts[i].p_size =
 547                     LE_64(efi_parts[i].efi_gpe_EndingLBA) -
 548                     vtoc->efi_parts[i].p_start + 1;
 549                 for (j = 0; j < EFI_PART_NAME_LEN; j++) {
 550                         vtoc->efi_parts[i].p_name[j] =
 551                             (uchar_t)LE_16(
 552                             efi_parts[i].efi_gpe_PartitionName[j]);
 553                 }
 554
 555                 UUID_LE_CONVERT(vtoc->efi_parts[i].p_uguid,
 556                     efi_parts[i].efi_gpe_UniquePartitionGUID);
 557         }
 558         free(efi);
 559
 560         return (dki_info.dki_partition);
 561 }
 562
 563 /* writes a "protective" MBR */
 564 static int
 565 write_pmbr(int fd, struct dk_gpt *vtoc)
 566 {
 567         dk_efi_t        dk_ioc;
 568         struct mboot    mb;
 569         uchar_t         *cp;
 570         diskaddr_t      size_in_lba;
 571         uchar_t         *buf;
 572         int             len;
 573
 574         len = (vtoc->efi_lbasize == 0) ? sizeof (mb) : vtoc->efi_lbasize;
 575         buf = calloc(len, 1);
 576
 577         /*
 578          * Preserve any boot code and disk signature if the first block is
 579          * already an MBR.
 580          */
 581         dk_ioc.dki_lba = 0;
 582         dk_ioc.dki_length = len;
 583         /* LINTED -- always longlong aligned */
 584         dk_ioc.dki_data = (efi_gpt_t *)buf;
 585         if (efi_ioctl(fd, DKIOCGETEFI, &dk_ioc) == -1) {
 586                 (void *) memcpy(&mb, buf, sizeof (mb));
 587                 bzero(&mb, sizeof (mb));
 588                 mb.signature = LE_16(MBB_MAGIC);
 589         } else {
 590                 (void *) memcpy(&mb, buf, sizeof (mb));
 591                 if (mb.signature != LE_16(MBB_MAGIC)) {
 592                         bzero(&mb, sizeof (mb));
 593                         mb.signature = LE_16(MBB_MAGIC);
 594                 }
 595         }
 596
 597         bzero(&mb.parts, sizeof (mb.parts));
 598         cp = (uchar_t *)&mb.parts[0];
 599         /* bootable or not */
 600         *cp++ = 0;
 601         /* beginning CHS; 0xffffff if not representable */
 602         *cp++ = 0xff;
 603         *cp++ = 0xff;
 604         *cp++ = 0xff;
 605         /* OS type */
 606         *cp++ = EFI_PMBR;
 607         /* ending CHS; 0xffffff if not representable */
 608         *cp++ = 0xff;
 609         *cp++ = 0xff;
 610         *cp++ = 0xff;
 611         /* starting LBA: 1 (little endian format) by EFI definition */
 612         *cp++ = 0x01;
 613         *cp++ = 0x00;
 614         *cp++ = 0x00;
 615         *cp++ = 0x00;
 616         /* ending LBA: last block on the disk (little endian format) */
 617         size_in_lba = vtoc->efi_last_lba;
 618         if (size_in_lba < 0xffffffff) {
 619                 *cp++ = (size_in_lba & 0x000000ff);
 620                 *cp++ = (size_in_lba & 0x0000ff00) >> 8;
 621                 *cp++ = (size_in_lba & 0x00ff0000) >> 16;
 622                 *cp++ = (size_in_lba & 0xff000000) >> 24;
 623         } else {
 624                 *cp++ = 0xff;
 625                 *cp++ = 0xff;
 626                 *cp++ = 0xff;
 627                 *cp++ = 0xff;
 628         }
 629
 630         (void *) memcpy(buf, &mb, sizeof (mb));
 631         /* LINTED -- always longlong aligned */
 632         dk_ioc.dki_data = (efi_gpt_t *)buf;
 633         dk_ioc.dki_lba = 0;
 634         dk_ioc.dki_length = len;
 635         if (efi_ioctl(fd, DKIOCSETEFI, &dk_ioc) == -1) {
 636                 free(buf);
 637                 switch (errno) {
 638                 case EIO:
 639                         return (VT_EIO);
 640                 case EINVAL:
 641                         return (VT_EINVAL);
 642                 default:
 643                         return (VT_ERROR);
 644                 }
 645         }
 646         free(buf);
 647         return (0);
 648 }
 649
 650 /* make sure the user specified something reasonable */
 651 static int
 652 check_input(struct dk_gpt *vtoc)
 653 {
 654         int                     resv_part = -1;
 655         int                     i, j;
 656         diskaddr_t              istart, jstart, isize, jsize, endsect;
 657
 658         /*
 659          * Sanity-check the input (make sure no partitions overlap)
 660          */
 661         for (i = 0; i < vtoc->efi_nparts; i++) {
 662                 /* It can't be unassigned and have an actual size */
 663                 if ((vtoc->efi_parts[i].p_tag == V_UNASSIGNED) &&
 664                     (vtoc->efi_parts[i].p_size != 0)) {
 665                         if (efi_debug) {
 666                                 (void) fprintf(stderr,
 667 "partition %d is \"unassigned\" but has a size of %llu",
 668                                     i,
 669                                     vtoc->efi_parts[i].p_size);
 670                         }
 671                         return (VT_EINVAL);
 672                 }
 673                 if (vtoc->efi_parts[i].p_tag == V_UNASSIGNED) {
 674                         if (uuid_is_null((uchar_t *)&vtoc->efi_parts[i].p_guid))
 675                                 continue;
 676                         /* we have encountered an unknown uuid */
 677                         vtoc->efi_parts[i].p_tag = 0xff;
 678                 }
 679                 if (vtoc->efi_parts[i].p_tag == V_RESERVED) {
 680                         if (resv_part != -1) {
 681                                 if (efi_debug) {
 682                                         (void) fprintf(stderr,
 683 "found duplicate reserved partition at %d\n",
 684                                             i);
 685                                 }
 686                                 return (VT_EINVAL);
 687                         }
 688                         resv_part = i;
 689                 }
 690                 if ((vtoc->efi_parts[i].p_start < vtoc->efi_first_u_lba) ||
 691                     (vtoc->efi_parts[i].p_start > vtoc->efi_last_u_lba)) {
 692                         if (efi_debug) {
 693                                 (void) fprintf(stderr,
 694                                     "Partition %d starts at %llu.  ",
 695                                     i,
 696                                     vtoc->efi_parts[i].p_start);
 697                                 (void) fprintf(stderr,
 698                                     "It must be between %llu and %llu.\n",
 699                                     vtoc->efi_first_u_lba,
 700                                     vtoc->efi_last_u_lba);
 701                         }
 702                         return (VT_EINVAL);
 703                 }
 704                 if ((vtoc->efi_parts[i].p_start +
 705                     vtoc->efi_parts[i].p_size <
 706                     vtoc->efi_first_u_lba) ||
 707                     (vtoc->efi_parts[i].p_start +
 708                     vtoc->efi_parts[i].p_size >
 709                     vtoc->efi_last_u_lba + 1)) {
 710                         if (efi_debug) {
 711                                 (void) fprintf(stderr,
 712                                     "Partition %d ends at %llu.  ",
 713                                     i,
 714                                     vtoc->efi_parts[i].p_start +
 715                                     vtoc->efi_parts[i].p_size);
 716                                 (void) fprintf(stderr,
 717                                     "It must be between %llu and %llu.\n",
 718                                     vtoc->efi_first_u_lba,
 719                                     vtoc->efi_last_u_lba);
 720                         }
 721                         return (VT_EINVAL);
 722                 }
 723
 724                 for (j = 0; j < vtoc->efi_nparts; j++) {
 725                         isize = vtoc->efi_parts[i].p_size;
 726                         jsize = vtoc->efi_parts[j].p_size;
 727                         istart = vtoc->efi_parts[i].p_start;
 728                         jstart = vtoc->efi_parts[j].p_start;
 729                         if ((i != j) && (isize != 0) && (jsize != 0)) {
 730                                 endsect = jstart + jsize -1;
 731                                 if ((jstart <= istart) &&
 732                                     (istart <= endsect)) {
 733                                         if (efi_debug) {
 734                                                 (void) fprintf(stderr,
 735 "Partition %d overlaps partition %d.",
 736                                                     i, j);
 737                                         }
 738                                         return (VT_EINVAL);
 739                                 }
 740                         }
 741                 }
 742         }
 743         /* just a warning for now */
 744         if ((resv_part == -1) && efi_debug) {
 745                 (void) fprintf(stderr,
 746                     "no reserved partition found\n");
 747         }
 748         return (0);
 749 }
 750
 751 /*
 752  * add all the unallocated space to the current label
 753  */
 754 int
 755 efi_use_whole_disk(int fd)
 756 {
 757         struct dk_gpt           *efi_label;
 758         int                     rval;
 759         int                     i;
 760         uint_t                  phy_last_slice = 0;
 761         diskaddr_t              pl_start = 0;
 762         diskaddr_t              pl_size;
 763
 764         rval = efi_alloc_and_read(fd, &efi_label);
 765         if (rval < 0) {
 766                 return (rval);
 767         }
 768
 769         /* find the last physically non-zero partition */
 770         for (i = 0; i < efi_label->efi_nparts - 2; i ++) {
 771                 if (pl_start < efi_label->efi_parts[i].p_start) {
 772                         pl_start = efi_label->efi_parts[i].p_start;
 773                         phy_last_slice = i;
 774                 }
 775         }
 776         pl_size = efi_label->efi_parts[phy_last_slice].p_size;
 777
 778         /*
 779          * If alter_lba is 1, we are using the backup label.
 780          * Since we can locate the backup label by disk capacity,
 781          * there must be no unallocated space.
 782          */
 783         if ((efi_label->efi_altern_lba == 1) || (efi_label->efi_altern_lba
 784             >= efi_label->efi_last_lba)) {
 785                 if (efi_debug) {
 786                         (void) fprintf(stderr,
 787                             "efi_use_whole_disk: requested space not found\n");
 788                 }
 789                 efi_free(efi_label);
 790                 return (VT_ENOSPC);
 791         }
 792
 793         /*
 794          * If there is space between the last physically non-zero partition
 795          * and the reserved partition, just add the unallocated space to this
 796          * area. Otherwise, the unallocated space is added to the last
 797          * physically non-zero partition.
 798          */
 799         if (pl_start + pl_size - 1 == efi_label->efi_last_u_lba -
 800             EFI_MIN_RESV_SIZE) {
 801                 efi_label->efi_parts[phy_last_slice].p_size +=
 802                     efi_label->efi_last_lba - efi_label->efi_altern_lba;
 803         }
 804
 805         /*
 806          * Move the reserved partition. There is currently no data in
 807          * here except fabricated devids (which get generated via
 808          * efi_write()). So there is no need to copy data.
 809          */
 810         efi_label->efi_parts[efi_label->efi_nparts - 1].p_start +=
 811             efi_label->efi_last_lba - efi_label->efi_altern_lba;
 812         efi_label->efi_last_u_lba += efi_label->efi_last_lba
 813             - efi_label->efi_altern_lba;
 814
 815         rval = efi_write(fd, efi_label);
 816         if (rval < 0) {
 817                 if (efi_debug) {
 818                         (void) fprintf(stderr,
 819                             "efi_use_whole_disk:fail to write label, rval=%d\n",
 820                             rval);
 821                 }
 822                 efi_free(efi_label);
 823                 return (rval);
 824         }
 825
 826         efi_free(efi_label);
 827         return (0);
 828 }
 829
 830
 831 /*
 832  * write EFI label and backup label
 833  */
 834 int
 835 efi_write(int fd, struct dk_gpt *vtoc)
 836 {
 837         dk_efi_t                dk_ioc;
 838         efi_gpt_t               *efi;
 839         efi_gpe_t               *efi_parts;
 840         int                     i, j;
 841         struct dk_cinfo         dki_info;
 842         int                     md_flag = 0;
 843         int                     nblocks;
 844         diskaddr_t              lba_backup_gpt_hdr;
 845
 846         if (ioctl(fd, DKIOCINFO, (caddr_t)&dki_info) == -1) {
 847                 if (efi_debug)
 848                         (void) fprintf(stderr, "DKIOCINFO errno 0x%x\n", errno);
 849                 switch (errno) {
 850                 case EIO:
 851                         return (VT_EIO);
 852                 case EINVAL:
 853                         return (VT_EINVAL);
 854                 default:
 855                         return (VT_ERROR);
 856                 }
 857         }
 858
 859         /* check if we are dealing wih a metadevice */
 860         if ((strncmp(dki_info.dki_cname, "pseudo", 7) == 0) &&
 861             (strncmp(dki_info.dki_dname, "md", 3) == 0)) {
 862                 md_flag = 1;
 863         }
 864
 865         if (check_input(vtoc)) {
 866                 /*
 867                  * not valid; if it's a metadevice just pass it down
 868                  * because SVM will do its own checking
 869                  */
 870                 if (md_flag == 0) {
 871                         return (VT_EINVAL);
 872                 }
 873         }
 874
 875         dk_ioc.dki_lba = 1;
 876         if (NBLOCKS(vtoc->efi_nparts, vtoc->efi_lbasize) < 34) {
 877                 dk_ioc.dki_length = EFI_MIN_ARRAY_SIZE + vtoc->efi_lbasize;
 878         } else {
 879                 dk_ioc.dki_length = NBLOCKS(vtoc->efi_nparts,
 880                     vtoc->efi_lbasize) *
 881                     vtoc->efi_lbasize;
 882         }
 883
 884         /*
 885          * the number of blocks occupied by GUID partition entry array
 886          */
 887         nblocks = dk_ioc.dki_length / vtoc->efi_lbasize - 1;
 888
 889         /*
 890          * Backup GPT header is located on the block after GUID
 891          * partition entry array. Here, we calculate the address
 892          * for backup GPT header.
 893          */
 894         lba_backup_gpt_hdr = vtoc->efi_last_u_lba + 1 + nblocks;
 895         if ((dk_ioc.dki_data = calloc(dk_ioc.dki_length, 1)) == NULL)
 896                 return (VT_ERROR);
 897
 898         efi = dk_ioc.dki_data;
 899
 900         /* stuff user's input into EFI struct */
 901         efi->efi_gpt_Signature = LE_64(EFI_SIGNATURE);
 902         efi->efi_gpt_Revision = LE_32(vtoc->efi_version); /* 0x02000100 */
 903         efi->efi_gpt_HeaderSize = LE_32(sizeof (struct efi_gpt));
 904         efi->efi_gpt_Reserved1 = 0;
 905         efi->efi_gpt_MyLBA = LE_64(1ULL);
 906         efi->efi_gpt_AlternateLBA = LE_64(lba_backup_gpt_hdr);
 907         efi->efi_gpt_FirstUsableLBA = LE_64(vtoc->efi_first_u_lba);
 908         efi->efi_gpt_LastUsableLBA = LE_64(vtoc->efi_last_u_lba);
 909         efi->efi_gpt_PartitionEntryLBA = LE_64(2ULL);
 910         efi->efi_gpt_NumberOfPartitionEntries = LE_32(vtoc->efi_nparts);
 911         efi->efi_gpt_SizeOfPartitionEntry = LE_32(sizeof (struct efi_gpe));
 912         UUID_LE_CONVERT(efi->efi_gpt_DiskGUID, vtoc->efi_disk_uguid);
 913
 914         /* LINTED -- always longlong aligned */
 915         efi_parts = (efi_gpe_t *)((char *)dk_ioc.dki_data + vtoc->efi_lbasize);
 916
 917         for (i = 0; i < vtoc->efi_nparts; i++) {
 918                 for (j = 0;
 919                     j < sizeof (conversion_array) /
 920                     sizeof (struct uuid_to_ptag); j++) {
 921
 922                         if (vtoc->efi_parts[i].p_tag == j) {
 923                                 UUID_LE_CONVERT(
 924                                     efi_parts[i].efi_gpe_PartitionTypeGUID,
 925                                     conversion_array[j].uuid);
 926                                 break;
 927                         }
 928                 }
 929
 930                 if (j == sizeof (conversion_array) /
 931                     sizeof (struct uuid_to_ptag)) {
 932                         /*
 933                          * If we didn't have a matching uuid match, bail here.
 934                          * Don't write a label with unknown uuid.
 935                          */
 936                         if (efi_debug) {
 937                                 (void) fprintf(stderr,
 938                                     "Unknown uuid for p_tag %d\n",
 939                                     vtoc->efi_parts[i].p_tag);
 940                         }
 941                         return (VT_EINVAL);
 942                 }
 943
 944                 efi_parts[i].efi_gpe_StartingLBA =
 945                     LE_64(vtoc->efi_parts[i].p_start);
 946                 efi_parts[i].efi_gpe_EndingLBA =
 947                     LE_64(vtoc->efi_parts[i].p_start +
 948                     vtoc->efi_parts[i].p_size - 1);
 949                 efi_parts[i].efi_gpe_Attributes.PartitionAttrs =
 950                     LE_16(vtoc->efi_parts[i].p_flag);
 951                 for (j = 0; j < EFI_PART_NAME_LEN; j++) {
 952                         efi_parts[i].efi_gpe_PartitionName[j] =
 953                             LE_16((ushort_t)vtoc->efi_parts[i].p_name[j]);
 954                 }
 955                 if ((vtoc->efi_parts[i].p_tag != V_UNASSIGNED) &&
 956                     uuid_is_null((uchar_t *)&vtoc->efi_parts[i].p_uguid)) {
 957                         (void) uuid_generate((uchar_t *)
 958                             &vtoc->efi_parts[i].p_uguid);
 959                 }
 960                 bcopy(&vtoc->efi_parts[i].p_uguid,
 961                     &efi_parts[i].efi_gpe_UniquePartitionGUID,
 962                     sizeof (uuid_t));
 963         }
 964         efi->efi_gpt_PartitionEntryArrayCRC32 =
 965             LE_32(efi_crc32((unsigned char *)efi_parts,
 966             vtoc->efi_nparts * (int)sizeof (struct efi_gpe)));
 967         efi->efi_gpt_HeaderCRC32 =
 968             LE_32(efi_crc32((unsigned char *)efi, sizeof (struct efi_gpt)));
 969
 970         if (efi_ioctl(fd, DKIOCSETEFI, &dk_ioc) == -1) {
 971                 free(dk_ioc.dki_data);
 972                 switch (errno) {
 973                 case EIO:
 974                         return (VT_EIO);
 975                 case EINVAL:
 976                         return (VT_EINVAL);
 977                 default:
 978                         return (VT_ERROR);
 979                 }
 980         }
 981         /* if it's a metadevice we're done */
 982         if (md_flag) {
 983                 free(dk_ioc.dki_data);
 984                 return (0);
 985         }
 986
 987         /* write backup partition array */
 988         dk_ioc.dki_lba = vtoc->efi_last_u_lba + 1;
 989         dk_ioc.dki_length -= vtoc->efi_lbasize;
 990         /* LINTED */
 991         dk_ioc.dki_data = (efi_gpt_t *)((char *)dk_ioc.dki_data +
 992             vtoc->efi_lbasize);
 993
 994         if (efi_ioctl(fd, DKIOCSETEFI, &dk_ioc) == -1) {
 995                 /*
 996                  * we wrote the primary label okay, so don't fail
 997                  */
 998                 if (efi_debug) {
 999                         (void) fprintf(stderr,
1000                             "write of backup partitions to block %llu "
1001                             "failed, errno %d\n",
1002                             vtoc->efi_last_u_lba + 1,
1003                             errno);
1004                 }
1005         }
1006         /*
1007          * now swap MyLBA and AlternateLBA fields and write backup
1008          * partition table header
1009          */
1010         dk_ioc.dki_lba = lba_backup_gpt_hdr;
1011         dk_ioc.dki_length = vtoc->efi_lbasize;
1012         /* LINTED */
1013         dk_ioc.dki_data = (efi_gpt_t *)((char *)dk_ioc.dki_data -
1014             vtoc->efi_lbasize);
1015         efi->efi_gpt_AlternateLBA = LE_64(1ULL);
1016         efi->efi_gpt_MyLBA = LE_64(lba_backup_gpt_hdr);
1017         efi->efi_gpt_PartitionEntryLBA = LE_64(vtoc->efi_last_u_lba + 1);
1018         efi->efi_gpt_HeaderCRC32 = 0;
1019         efi->efi_gpt_HeaderCRC32 =
1020             LE_32(efi_crc32((unsigned char *)dk_ioc.dki_data,
1021             sizeof (struct efi_gpt)));
1022
1023         if (efi_ioctl(fd, DKIOCSETEFI, &dk_ioc) == -1) {
1024                 if (efi_debug) {
1025                         (void) fprintf(stderr,
1026                             "write of backup header to block %llu failed, "
1027                             "errno %d\n",
1028                             lba_backup_gpt_hdr,
1029                             errno);
1030                 }
1031         }
1032         /* write the PMBR */
1033         (void) write_pmbr(fd, vtoc);
1034         free(dk_ioc.dki_data);
1035         return (0);
1036 }
1037
1038 void
1039 efi_free(struct dk_gpt *ptr)
1040 {
1041         free(ptr);
1042 }
1043
1044 /*
1045  * Input: File descriptor
1046  * Output: 1 if disk has an EFI label, or > 2TB with no VTOC or legacy MBR.
1047  * Otherwise 0.
1048  */
1049 int
1050 efi_type(int fd)
1051 {
1052         struct vtoc vtoc;
1053         struct extvtoc extvtoc;
1054
1055         if (ioctl(fd, DKIOCGEXTVTOC, &extvtoc) == -1) {
1056                 if (errno == ENOTSUP)
1057                         return (1);
1058                 else if (errno == ENOTTY) {
1059                         if (ioctl(fd, DKIOCGVTOC, &vtoc) == -1)
1060                                 if (errno == ENOTSUP)
1061                                         return (1);
1062                 }
1063         }
1064         return (0);
1065 }
1066
1067 void
1068 efi_err_check(struct dk_gpt *vtoc)
1069 {
1070         int                     resv_part = -1;
1071         int                     i, j;
1072         diskaddr_t              istart, jstart, isize, jsize, endsect;
1073         int                     overlap = 0;
1074
1075         /*
1076          * make sure no partitions overlap
1077          */
1078         for (i = 0; i < vtoc->efi_nparts; i++) {
1079                 /* It can't be unassigned and have an actual size */
1080                 if ((vtoc->efi_parts[i].p_tag == V_UNASSIGNED) &&
1081                     (vtoc->efi_parts[i].p_size != 0)) {
1082                         (void) fprintf(stderr,
1083                             "partition %d is \"unassigned\" but has a size "
1084                             "of %llu\n", i, vtoc->efi_parts[i].p_size);
1085                 }
1086                 if (vtoc->efi_parts[i].p_tag == V_UNASSIGNED) {
1087                         continue;
1088                 }
1089                 if (vtoc->efi_parts[i].p_tag == V_RESERVED) {
1090                         if (resv_part != -1) {
1091                                 (void) fprintf(stderr,
1092                                     "found duplicate reserved partition at "
1093                                     "%d\n", i);
1094                         }
1095                         resv_part = i;
1096                         if (vtoc->efi_parts[i].p_size != EFI_MIN_RESV_SIZE)
1097                                 (void) fprintf(stderr,
1098                                     "Warning: reserved partition size must "
1099                                     "be %d sectors\n", EFI_MIN_RESV_SIZE);
1100                 }
1101                 if ((vtoc->efi_parts[i].p_start < vtoc->efi_first_u_lba) ||
1102                     (vtoc->efi_parts[i].p_start > vtoc->efi_last_u_lba)) {
1103                         (void) fprintf(stderr,
1104                             "Partition %d starts at %llu\n",
1105                             i,
1106                             vtoc->efi_parts[i].p_start);
1107                         (void) fprintf(stderr,
1108                             "It must be between %llu and %llu.\n",
1109                             vtoc->efi_first_u_lba,
1110                             vtoc->efi_last_u_lba);
1111                 }
1112                 if ((vtoc->efi_parts[i].p_start +
1113                     vtoc->efi_parts[i].p_size <
1114                     vtoc->efi_first_u_lba) ||
1115                     (vtoc->efi_parts[i].p_start +
1116                     vtoc->efi_parts[i].p_size >
1117                     vtoc->efi_last_u_lba + 1)) {
1118                         (void) fprintf(stderr,
1119                             "Partition %d ends at %llu\n",
1120                             i,
1121                             vtoc->efi_parts[i].p_start +
1122                             vtoc->efi_parts[i].p_size);
1123                         (void) fprintf(stderr,
1124                             "It must be between %llu and %llu.\n",
1125                             vtoc->efi_first_u_lba,
1126                             vtoc->efi_last_u_lba);
1127                 }
1128
1129                 for (j = 0; j < vtoc->efi_nparts; j++) {
1130                         isize = vtoc->efi_parts[i].p_size;
1131                         jsize = vtoc->efi_parts[j].p_size;
1132                         istart = vtoc->efi_parts[i].p_start;
1133                         jstart = vtoc->efi_parts[j].p_start;
1134                         if ((i != j) && (isize != 0) && (jsize != 0)) {
1135                                 endsect = jstart + jsize -1;
1136                                 if ((jstart <= istart) &&
1137                                     (istart <= endsect)) {
1138                                         if (!overlap) {
1139                                         (void) fprintf(stderr,
1140                                             "label error: EFI Labels do not "
1141                                             "support overlapping partitions\n");
1142                                         }
1143                                         (void) fprintf(stderr,
1144                                             "Partition %d overlaps partition "
1145                                             "%d.\n", i, j);
1146                                         overlap = 1;
1147                                 }
1148                         }
1149                 }
1150         }
1151         /* make sure there is a reserved partition */
1152         if (resv_part == -1) {
1153                 (void) fprintf(stderr,
1154                     "no reserved partition found\n");
1155         }
1156 }
1157
1158 /*
1159  * We need to get information necessary to construct a *new* efi
1160  * label type
1161  */
1162 int
1163 efi_auto_sense(int fd, struct dk_gpt **vtoc)
1164 {
1165
1166         int     i;
1167
1168         /*
1169          * Now build the default partition table
1170          */
1171         if (efi_alloc_and_init(fd, EFI_NUMPAR, vtoc) != 0) {
1172                 if (efi_debug) {
1173                         (void) fprintf(stderr, "efi_alloc_and_init failed.\n");
1174                 }
1175                 return (-1);
1176         }
1177
1178         for (i = 0; i < min((*vtoc)->efi_nparts, V_NUMPAR); i++) {
1179                 (*vtoc)->efi_parts[i].p_tag = default_vtoc_map[i].p_tag;
1180                 (*vtoc)->efi_parts[i].p_flag = default_vtoc_map[i].p_flag;
1181                 (*vtoc)->efi_parts[i].p_start = 0;
1182                 (*vtoc)->efi_parts[i].p_size = 0;
1183         }
1184         /*
1185          * Make constants first
1186          * and variable partitions later
1187          */
1188
1189         /* root partition - s0 128 MB */
1190         (*vtoc)->efi_parts[0].p_start = 34;
1191         (*vtoc)->efi_parts[0].p_size = 262144;
1192
1193         /* partition - s1  128 MB */
1194         (*vtoc)->efi_parts[1].p_start = 262178;
1195         (*vtoc)->efi_parts[1].p_size = 262144;
1196
1197         /* partition -s2 is NOT the Backup disk */
1198         (*vtoc)->efi_parts[2].p_tag = V_UNASSIGNED;
1199
1200         /* partition -s6 /usr partition - HOG */
1201         (*vtoc)->efi_parts[6].p_start = 524322;
1202         (*vtoc)->efi_parts[6].p_size = (*vtoc)->efi_last_u_lba - 524322
1203             - (1024 * 16);
1204
1205         /* efi reserved partition - s9 16K */
1206         (*vtoc)->efi_parts[8].p_start = (*vtoc)->efi_last_u_lba - (1024 * 16);
1207         (*vtoc)->efi_parts[8].p_size = (1024 * 16);
1208         (*vtoc)->efi_parts[8].p_tag = V_RESERVED;
1209         return (0);
1210 }