disk/part_efi.c

   1 /*
   2  * Copyright (C) 2008 RuggedCom, Inc.
   3  * Richard Retanubun <RichardRetanubun@RuggedCom.com>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 /*
   9  * NOTE:
  10  *   when CONFIG_SYS_64BIT_LBA is not defined, lbaint_t is 32 bits; this
  11  *   limits the maximum size of addressable storage to < 2 Terra Bytes
  12  */
  13 #include <asm/unaligned.h>
  14 #include <common.h>
  15 #include <command.h>
  16 #include <ide.h>
  17 #include <inttypes.h>
  18 #include <malloc.h>
  19 #include <memalign.h>
  20 #include <part_efi.h>
  21 #include <linux/ctype.h>
  22
  23 DECLARE_GLOBAL_DATA_PTR;
  24
  25 #ifdef HAVE_BLOCK_DEVICE
  26 /**
  27  * efi_crc32() - EFI version of crc32 function
  28  * @buf: buffer to calculate crc32 of
  29  * @len - length of buf
  30  *
  31  * Description: Returns EFI-style CRC32 value for @buf
  32  */
  33 static inline u32 efi_crc32(const void *buf, u32 len)
  34 {
  35         return crc32(0, buf, len);
  36 }
  37
  38 /*
  39  * Private function prototypes
  40  */
  41
  42 static int pmbr_part_valid(struct partition *part);
  43 static int is_pmbr_valid(legacy_mbr * mbr);
  44 static int is_gpt_valid(block_dev_desc_t *dev_desc, u64 lba,
  45                                 gpt_header *pgpt_head, gpt_entry **pgpt_pte);
  46 static gpt_entry *alloc_read_gpt_entries(block_dev_desc_t * dev_desc,
  47                                 gpt_header * pgpt_head);
  48 static int is_pte_valid(gpt_entry * pte);
  49
  50 static char *print_efiname(gpt_entry *pte)
  51 {
  52         static char name[PARTNAME_SZ + 1];
  53         int i;
  54         for (i = 0; i < PARTNAME_SZ; i++) {
  55                 u8 c;
  56                 c = pte->partition_name[i] & 0xff;
  57                 c = (c && !isprint(c)) ? '.' : c;
  58                 name[i] = c;
  59         }
  60         name[PARTNAME_SZ] = 0;
  61         return name;
  62 }
  63
  64 static efi_guid_t system_guid = PARTITION_SYSTEM_GUID;
  65
  66 static inline int is_bootable(gpt_entry *p)
  67 {
  68         return p->attributes.fields.legacy_bios_bootable ||
  69                 !memcmp(&(p->partition_type_guid), &system_guid,
  70                         sizeof(efi_guid_t));
  71 }
  72
  73 static int validate_gpt_header(gpt_header *gpt_h, lbaint_t lba,
  74                 lbaint_t lastlba)
  75 {
  76         uint32_t crc32_backup = 0;
  77         uint32_t calc_crc32;
  78
  79         /* Check the GPT header signature */
  80         if (le64_to_cpu(gpt_h->signature) != GPT_HEADER_SIGNATURE) {
  81                 printf("%s signature is wrong: 0x%llX != 0x%llX\n",
  82                        "GUID Partition Table Header",
  83                        le64_to_cpu(gpt_h->signature),
  84                        GPT_HEADER_SIGNATURE);
  85                 return -1;
  86         }
  87
  88         /* Check the GUID Partition Table CRC */
  89         memcpy(&crc32_backup, &gpt_h->header_crc32, sizeof(crc32_backup));
  90         memset(&gpt_h->header_crc32, 0, sizeof(gpt_h->header_crc32));
  91
  92         calc_crc32 = efi_crc32((const unsigned char *)gpt_h,
  93                 le32_to_cpu(gpt_h->header_size));
  94
  95         memcpy(&gpt_h->header_crc32, &crc32_backup, sizeof(crc32_backup));
  96
  97         if (calc_crc32 != le32_to_cpu(crc32_backup)) {
  98                 printf("%s CRC is wrong: 0x%x != 0x%x\n",
  99                        "GUID Partition Table Header",
 100                        le32_to_cpu(crc32_backup), calc_crc32);
 101                 return -1;
 102         }
 103
 104         /*
 105          * Check that the my_lba entry points to the LBA that contains the GPT
 106          */
 107         if (le64_to_cpu(gpt_h->my_lba) != lba) {
 108                 printf("GPT: my_lba incorrect: %llX != " LBAF "\n",
 109                        le64_to_cpu(gpt_h->my_lba),
 110                        lba);
 111                 return -1;
 112         }
 113
 114         /*
 115          * Check that the first_usable_lba and that the last_usable_lba are
 116          * within the disk.
 117          */
 118         if (le64_to_cpu(gpt_h->first_usable_lba) > lastlba) {
 119                 printf("GPT: first_usable_lba incorrect: %llX > " LBAF "\n",
 120                        le64_to_cpu(gpt_h->first_usable_lba), lastlba);
 121                 return -1;
 122         }
 123         if (le64_to_cpu(gpt_h->last_usable_lba) > lastlba) {
 124                 printf("GPT: last_usable_lba incorrect: %llX > " LBAF "\n",
 125                        le64_to_cpu(gpt_h->last_usable_lba), lastlba);
 126                 return -1;
 127         }
 128
 129         debug("GPT: first_usable_lba: %llX last_usable_lba: %llX last lba: "
 130               LBAF "\n", le64_to_cpu(gpt_h->first_usable_lba),
 131               le64_to_cpu(gpt_h->last_usable_lba), lastlba);
 132
 133         return 0;
 134 }
 135
 136 static int validate_gpt_entries(gpt_header *gpt_h, gpt_entry *gpt_e)
 137 {
 138         uint32_t calc_crc32;
 139
 140         /* Check the GUID Partition Table Entry Array CRC */
 141         calc_crc32 = efi_crc32((const unsigned char *)gpt_e,
 142                 le32_to_cpu(gpt_h->num_partition_entries) *
 143                 le32_to_cpu(gpt_h->sizeof_partition_entry));
 144
 145         if (calc_crc32 != le32_to_cpu(gpt_h->partition_entry_array_crc32)) {
 146                 printf("%s: 0x%x != 0x%x\n",
 147                        "GUID Partition Table Entry Array CRC is wrong",
 148                        le32_to_cpu(gpt_h->partition_entry_array_crc32),
 149                        calc_crc32);
 150                 return -1;
 151         }
 152
 153         return 0;
 154 }
 155
 156 static void prepare_backup_gpt_header(gpt_header *gpt_h)
 157 {
 158         uint32_t calc_crc32;
 159         uint64_t val;
 160
 161         /* recalculate the values for the Backup GPT Header */
 162         val = le64_to_cpu(gpt_h->my_lba);
 163         gpt_h->my_lba = gpt_h->alternate_lba;
 164         gpt_h->alternate_lba = cpu_to_le64(val);
 165         gpt_h->partition_entry_lba =
 166                         cpu_to_le64(le64_to_cpu(gpt_h->last_usable_lba) + 1);
 167         gpt_h->header_crc32 = 0;
 168
 169         calc_crc32 = efi_crc32((const unsigned char *)gpt_h,
 170                                le32_to_cpu(gpt_h->header_size));
 171         gpt_h->header_crc32 = cpu_to_le32(calc_crc32);
 172 }
 173
 174 #ifdef CONFIG_EFI_PARTITION
 175 /*
 176  * Public Functions (include/part.h)
 177  */
 178
 179 void print_part_efi(block_dev_desc_t * dev_desc)
 180 {
 181         ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_head, 1, dev_desc->blksz);
 182         gpt_entry *gpt_pte = NULL;
 183         int i = 0;
 184         char uuid[37];
 185         unsigned char *uuid_bin;
 186
 187         if (!dev_desc) {
 188                 printf("%s: Invalid Argument(s)\n", __func__);
 189                 return;
 190         }
 191         /* This function validates AND fills in the GPT header and PTE */
 192         if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA,
 193                          gpt_head, &gpt_pte) != 1) {
 194                 printf("%s: *** ERROR: Invalid GPT ***\n", __func__);
 195                 if (is_gpt_valid(dev_desc, (dev_desc->lba - 1),
 196                                  gpt_head, &gpt_pte) != 1) {
 197                         printf("%s: *** ERROR: Invalid Backup GPT ***\n",
 198                                __func__);
 199                         return;
 200                 } else {
 201                         printf("%s: ***        Using Backup GPT ***\n",
 202                                __func__);
 203                 }
 204         }
 205
 206         debug("%s: gpt-entry at %p\n", __func__, gpt_pte);
 207
 208         printf("Part\tStart LBA\tEnd LBA\t\tName\n");
 209         printf("\tAttributes\n");
 210         printf("\tType GUID\n");
 211         printf("\tPartition GUID\n");
 212
 213         for (i = 0; i < le32_to_cpu(gpt_head->num_partition_entries); i++) {
 214                 /* Stop at the first non valid PTE */
 215                 if (!is_pte_valid(&gpt_pte[i]))
 216                         break;
 217
 218                 printf("%3d\t0x%08llx\t0x%08llx\t\"%s\"\n", (i + 1),
 219                         le64_to_cpu(gpt_pte[i].starting_lba),
 220                         le64_to_cpu(gpt_pte[i].ending_lba),
 221                         print_efiname(&gpt_pte[i]));
 222                 printf("\tattrs:\t0x%016llx\n", gpt_pte[i].attributes.raw);
 223                 uuid_bin = (unsigned char *)gpt_pte[i].partition_type_guid.b;
 224                 uuid_bin_to_str(uuid_bin, uuid, UUID_STR_FORMAT_GUID);
 225                 printf("\ttype:\t%s\n", uuid);
 226 #ifdef CONFIG_PARTITION_TYPE_GUID
 227                 if (!uuid_guid_get_str(uuid_bin, uuid))
 228                         printf("\ttype:\t%s\n", uuid);
 229 #endif
 230                 uuid_bin = (unsigned char *)gpt_pte[i].unique_partition_guid.b;
 231                 uuid_bin_to_str(uuid_bin, uuid, UUID_STR_FORMAT_GUID);
 232                 printf("\tguid:\t%s\n", uuid);
 233         }
 234
 235         /* Remember to free pte */
 236         free(gpt_pte);
 237         return;
 238 }
 239
 240 int get_partition_info_efi(block_dev_desc_t * dev_desc, int part,
 241                                 disk_partition_t * info)
 242 {
 243         ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_head, 1, dev_desc->blksz);
 244         gpt_entry *gpt_pte = NULL;
 245
 246         /* "part" argument must be at least 1 */
 247         if (!dev_desc || !info || part < 1) {
 248                 printf("%s: Invalid Argument(s)\n", __func__);
 249                 return -1;
 250         }
 251
 252         /* This function validates AND fills in the GPT header and PTE */
 253         if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA,
 254                         gpt_head, &gpt_pte) != 1) {
 255                 printf("%s: *** ERROR: Invalid GPT ***\n", __func__);
 256                 if (is_gpt_valid(dev_desc, (dev_desc->lba - 1),
 257                                  gpt_head, &gpt_pte) != 1) {
 258                         printf("%s: *** ERROR: Invalid Backup GPT ***\n",
 259                                __func__);
 260                         return -1;
 261                 } else {
 262                         printf("%s: ***        Using Backup GPT ***\n",
 263                                __func__);
 264                 }
 265         }
 266
 267         if (part > le32_to_cpu(gpt_head->num_partition_entries) ||
 268             !is_pte_valid(&gpt_pte[part - 1])) {
 269                 debug("%s: *** ERROR: Invalid partition number %d ***\n",
 270                         __func__, part);
 271                 free(gpt_pte);
 272                 return -1;
 273         }
 274
 275         /* The 'lbaint_t' casting may limit the maximum disk size to 2 TB */
 276         info->start = (lbaint_t)le64_to_cpu(gpt_pte[part - 1].starting_lba);
 277         /* The ending LBA is inclusive, to calculate size, add 1 to it */
 278         info->size = (lbaint_t)le64_to_cpu(gpt_pte[part - 1].ending_lba) + 1
 279                      - info->start;
 280         info->blksz = dev_desc->blksz;
 281
 282         sprintf((char *)info->name, "%s",
 283                         print_efiname(&gpt_pte[part - 1]));
 284         sprintf((char *)info->type, "U-Boot");
 285         info->bootable = is_bootable(&gpt_pte[part - 1]);
 286 #ifdef CONFIG_PARTITION_UUIDS
 287         uuid_bin_to_str(gpt_pte[part - 1].unique_partition_guid.b, info->uuid,
 288                         UUID_STR_FORMAT_GUID);
 289 #endif
 290 #ifdef CONFIG_PARTITION_TYPE_GUID
 291         uuid_bin_to_str(gpt_pte[part - 1].partition_type_guid.b,
 292                         info->type_guid, UUID_STR_FORMAT_GUID);
 293 #endif
 294
 295         debug("%s: start 0x" LBAF ", size 0x" LBAF ", name %s\n", __func__,
 296               info->start, info->size, info->name);
 297
 298         /* Remember to free pte */
 299         free(gpt_pte);
 300         return 0;
 301 }
 302
 303 int get_partition_info_efi_by_name(block_dev_desc_t *dev_desc,
 304         const char *name, disk_partition_t *info)
 305 {
 306         int ret;
 307         int i;
 308         for (i = 1; i < GPT_ENTRY_NUMBERS; i++) {
 309                 ret = get_partition_info_efi(dev_desc, i, info);
 310                 if (ret != 0) {
 311                         /* no more entries in table */
 312                         return -1;
 313                 }
 314                 if (strcmp(name, (const char *)info->name) == 0) {
 315                         /* matched */
 316                         return 0;
 317                 }
 318         }
 319         return -2;
 320 }
 321
 322 int test_part_efi(block_dev_desc_t * dev_desc)
 323 {
 324         ALLOC_CACHE_ALIGN_BUFFER_PAD(legacy_mbr, legacymbr, 1, dev_desc->blksz);
 325
 326         /* Read legacy MBR from block 0 and validate it */
 327         if ((dev_desc->block_read(dev_desc->dev, 0, 1, (ulong *)legacymbr) != 1)
 328                 || (is_pmbr_valid(legacymbr) != 1)) {
 329                 return -1;
 330         }
 331         return 0;
 332 }
 333
 334 /**
 335  * set_protective_mbr(): Set the EFI protective MBR
 336  * @param dev_desc - block device descriptor
 337  *
 338  * @return - zero on success, otherwise error
 339  */
 340 static int set_protective_mbr(block_dev_desc_t *dev_desc)
 341 {
 342         /* Setup the Protective MBR */
 343         ALLOC_CACHE_ALIGN_BUFFER(legacy_mbr, p_mbr, 1);
 344         memset(p_mbr, 0, sizeof(*p_mbr));
 345
 346         if (p_mbr == NULL) {
 347                 printf("%s: calloc failed!\n", __func__);
 348                 return -1;
 349         }
 350         /* Append signature */
 351         p_mbr->signature = MSDOS_MBR_SIGNATURE;
 352         p_mbr->partition_record[0].sys_ind = EFI_PMBR_OSTYPE_EFI_GPT;
 353         p_mbr->partition_record[0].start_sect = 1;
 354         p_mbr->partition_record[0].nr_sects = (u32) dev_desc->lba - 1;
 355
 356         /* Write MBR sector to the MMC device */
 357         if (dev_desc->block_write(dev_desc->dev, 0, 1, p_mbr) != 1) {
 358                 printf("** Can't write to device %d **\n",
 359                         dev_desc->dev);
 360                 return -1;
 361         }
 362
 363         return 0;
 364 }
 365
 366 int write_gpt_table(block_dev_desc_t *dev_desc,
 367                 gpt_header *gpt_h, gpt_entry *gpt_e)
 368 {
 369         const int pte_blk_cnt = BLOCK_CNT((gpt_h->num_partition_entries
 370                                            * sizeof(gpt_entry)), dev_desc);
 371         u32 calc_crc32;
 372
 373         debug("max lba: %x\n", (u32) dev_desc->lba);
 374         /* Setup the Protective MBR */
 375         if (set_protective_mbr(dev_desc) < 0)
 376                 goto err;
 377
 378         /* Generate CRC for the Primary GPT Header */
 379         calc_crc32 = efi_crc32((const unsigned char *)gpt_e,
 380                               le32_to_cpu(gpt_h->num_partition_entries) *
 381                               le32_to_cpu(gpt_h->sizeof_partition_entry));
 382         gpt_h->partition_entry_array_crc32 = cpu_to_le32(calc_crc32);
 383
 384         calc_crc32 = efi_crc32((const unsigned char *)gpt_h,
 385                               le32_to_cpu(gpt_h->header_size));
 386         gpt_h->header_crc32 = cpu_to_le32(calc_crc32);
 387
 388         /* Write the First GPT to the block right after the Legacy MBR */
 389         if (dev_desc->block_write(dev_desc->dev, 1, 1, gpt_h) != 1)
 390                 goto err;
 391
 392         if (dev_desc->block_write(dev_desc->dev, 2, pte_blk_cnt, gpt_e)
 393             != pte_blk_cnt)
 394                 goto err;
 395
 396         prepare_backup_gpt_header(gpt_h);
 397
 398         if (dev_desc->block_write(dev_desc->dev,
 399                                   (lbaint_t)le64_to_cpu(gpt_h->last_usable_lba)
 400                                   + 1,
 401                                   pte_blk_cnt, gpt_e) != pte_blk_cnt)
 402                 goto err;
 403
 404         if (dev_desc->block_write(dev_desc->dev,
 405                                   (lbaint_t)le64_to_cpu(gpt_h->my_lba), 1,
 406                                   gpt_h) != 1)
 407                 goto err;
 408
 409         debug("GPT successfully written to block device!\n");
 410         return 0;
 411
 412  err:
 413         printf("** Can't write to device %d **\n", dev_desc->dev);
 414         return -1;
 415 }
 416
 417 int gpt_fill_pte(gpt_header *gpt_h, gpt_entry *gpt_e,
 418                 disk_partition_t *partitions, int parts)
 419 {
 420         lbaint_t offset = (lbaint_t)le64_to_cpu(gpt_h->first_usable_lba);
 421         lbaint_t start;
 422         lbaint_t last_usable_lba = (lbaint_t)
 423                         le64_to_cpu(gpt_h->last_usable_lba);
 424         int i, k;
 425         size_t efiname_len, dosname_len;
 426 #ifdef CONFIG_PARTITION_UUIDS
 427         char *str_uuid;
 428         unsigned char *bin_uuid;
 429 #endif
 430 #ifdef CONFIG_PARTITION_TYPE_GUID
 431         char *str_type_guid;
 432         unsigned char *bin_type_guid;
 433 #endif
 434
 435         for (i = 0; i < parts; i++) {
 436                 /* partition starting lba */
 437                 start = partitions[i].start;
 438                 if (start && (start < offset)) {
 439                         printf("Partition overlap\n");
 440                         return -1;
 441                 }
 442                 if (start) {
 443                         gpt_e[i].starting_lba = cpu_to_le64(start);
 444                         offset = start + partitions[i].size;
 445                 } else {
 446                         gpt_e[i].starting_lba = cpu_to_le64(offset);
 447                         offset += partitions[i].size;
 448                 }
 449                 if (offset >= last_usable_lba) {
 450                         printf("Partitions layout exceds disk size\n");
 451                         return -1;
 452                 }
 453                 /* partition ending lba */
 454                 if ((i == parts - 1) && (partitions[i].size == 0))
 455                         /* extend the last partition to maximuim */
 456                         gpt_e[i].ending_lba = gpt_h->last_usable_lba;
 457                 else
 458                         gpt_e[i].ending_lba = cpu_to_le64(offset - 1);
 459
 460 #ifdef CONFIG_PARTITION_TYPE_GUID
 461                 str_type_guid = partitions[i].type_guid;
 462                 bin_type_guid = gpt_e[i].partition_type_guid.b;
 463                 if (strlen(str_type_guid)) {
 464                         if (uuid_str_to_bin(str_type_guid, bin_type_guid,
 465                                             UUID_STR_FORMAT_GUID)) {
 466                                 printf("Partition no. %d: invalid type guid: %s\n",
 467                                        i, str_type_guid);
 468                                 return -1;
 469                         }
 470                 } else {
 471                         /* default partition type GUID */
 472                         memcpy(bin_type_guid,
 473                                &PARTITION_BASIC_DATA_GUID, 16);
 474                 }
 475 #else
 476                 /* partition type GUID */
 477                 memcpy(gpt_e[i].partition_type_guid.b,
 478                         &PARTITION_BASIC_DATA_GUID, 16);
 479 #endif
 480
 481 #ifdef CONFIG_PARTITION_UUIDS
 482                 str_uuid = partitions[i].uuid;
 483                 bin_uuid = gpt_e[i].unique_partition_guid.b;
 484
 485                 if (uuid_str_to_bin(str_uuid, bin_uuid, UUID_STR_FORMAT_STD)) {
 486                         printf("Partition no. %d: invalid guid: %s\n",
 487                                 i, str_uuid);
 488                         return -1;
 489                 }
 490 #endif
 491
 492                 /* partition attributes */
 493                 memset(&gpt_e[i].attributes, 0,
 494                        sizeof(gpt_entry_attributes));
 495
 496                 /* partition name */
 497                 efiname_len = sizeof(gpt_e[i].partition_name)
 498                         / sizeof(efi_char16_t);
 499                 dosname_len = sizeof(partitions[i].name);
 500
 501                 memset(gpt_e[i].partition_name, 0,
 502                        sizeof(gpt_e[i].partition_name));
 503
 504                 for (k = 0; k < min(dosname_len, efiname_len); k++)
 505                         gpt_e[i].partition_name[k] =
 506                                 (efi_char16_t)(partitions[i].name[k]);
 507
 508                 debug("%s: name: %s offset[%d]: 0x" LBAF
 509                       " size[%d]: 0x" LBAF "\n",
 510                       __func__, partitions[i].name, i,
 511                       offset, i, partitions[i].size);
 512         }
 513
 514         return 0;
 515 }
 516
 517 int gpt_fill_header(block_dev_desc_t *dev_desc, gpt_header *gpt_h,
 518                 char *str_guid, int parts_count)
 519 {
 520         gpt_h->signature = cpu_to_le64(GPT_HEADER_SIGNATURE);
 521         gpt_h->revision = cpu_to_le32(GPT_HEADER_REVISION_V1);
 522         gpt_h->header_size = cpu_to_le32(sizeof(gpt_header));
 523         gpt_h->my_lba = cpu_to_le64(1);
 524         gpt_h->alternate_lba = cpu_to_le64(dev_desc->lba - 1);
 525         gpt_h->first_usable_lba = cpu_to_le64(34);
 526         gpt_h->last_usable_lba = cpu_to_le64(dev_desc->lba - 34);
 527         gpt_h->partition_entry_lba = cpu_to_le64(2);
 528         gpt_h->num_partition_entries = cpu_to_le32(GPT_ENTRY_NUMBERS);
 529         gpt_h->sizeof_partition_entry = cpu_to_le32(sizeof(gpt_entry));
 530         gpt_h->header_crc32 = 0;
 531         gpt_h->partition_entry_array_crc32 = 0;
 532
 533         if (uuid_str_to_bin(str_guid, gpt_h->disk_guid.b, UUID_STR_FORMAT_GUID))
 534                 return -1;
 535
 536         return 0;
 537 }
 538
 539 int gpt_restore(block_dev_desc_t *dev_desc, char *str_disk_guid,
 540                 disk_partition_t *partitions, int parts_count)
 541 {
 542         int ret;
 543
 544         gpt_header *gpt_h = calloc(1, PAD_TO_BLOCKSIZE(sizeof(gpt_header),
 545                                                        dev_desc));
 546         gpt_entry *gpt_e;
 547
 548         if (gpt_h == NULL) {
 549                 printf("%s: calloc failed!\n", __func__);
 550                 return -1;
 551         }
 552
 553         gpt_e = calloc(1, PAD_TO_BLOCKSIZE(GPT_ENTRY_NUMBERS
 554                                                * sizeof(gpt_entry),
 555                                                dev_desc));
 556         if (gpt_e == NULL) {
 557                 printf("%s: calloc failed!\n", __func__);
 558                 free(gpt_h);
 559                 return -1;
 560         }
 561
 562         /* Generate Primary GPT header (LBA1) */
 563         ret = gpt_fill_header(dev_desc, gpt_h, str_disk_guid, parts_count);
 564         if (ret)
 565                 goto err;
 566
 567         /* Generate partition entries */
 568         ret = gpt_fill_pte(gpt_h, gpt_e, partitions, parts_count);
 569         if (ret)
 570                 goto err;
 571
 572         /* Write GPT partition table */
 573         ret = write_gpt_table(dev_desc, gpt_h, gpt_e);
 574
 575 err:
 576         free(gpt_e);
 577         free(gpt_h);
 578         return ret;
 579 }
 580
 581 int is_valid_gpt_buf(block_dev_desc_t *dev_desc, void *buf)
 582 {
 583         gpt_header *gpt_h;
 584         gpt_entry *gpt_e;
 585
 586         /* determine start of GPT Header in the buffer */
 587         gpt_h = buf + (GPT_PRIMARY_PARTITION_TABLE_LBA *
 588                        dev_desc->blksz);
 589         if (validate_gpt_header(gpt_h, GPT_PRIMARY_PARTITION_TABLE_LBA,
 590                                 dev_desc->lba))
 591                 return -1;
 592
 593         /* determine start of GPT Entries in the buffer */
 594         gpt_e = buf + (le64_to_cpu(gpt_h->partition_entry_lba) *
 595                        dev_desc->blksz);
 596         if (validate_gpt_entries(gpt_h, gpt_e))
 597                 return -1;
 598
 599         return 0;
 600 }
 601
 602 int write_mbr_and_gpt_partitions(block_dev_desc_t *dev_desc, void *buf)
 603 {
 604         gpt_header *gpt_h;
 605         gpt_entry *gpt_e;
 606         int gpt_e_blk_cnt;
 607         lbaint_t lba;
 608         int cnt;
 609
 610         if (is_valid_gpt_buf(dev_desc, buf))
 611                 return -1;
 612
 613         /* determine start of GPT Header in the buffer */
 614         gpt_h = buf + (GPT_PRIMARY_PARTITION_TABLE_LBA *
 615                        dev_desc->blksz);
 616
 617         /* determine start of GPT Entries in the buffer */
 618         gpt_e = buf + (le64_to_cpu(gpt_h->partition_entry_lba) *
 619                        dev_desc->blksz);
 620         gpt_e_blk_cnt = BLOCK_CNT((le32_to_cpu(gpt_h->num_partition_entries) *
 621                                    le32_to_cpu(gpt_h->sizeof_partition_entry)),
 622                                   dev_desc);
 623
 624         /* write MBR */
 625         lba = 0;        /* MBR is always at 0 */
 626         cnt = 1;        /* MBR (1 block) */
 627         if (dev_desc->block_write(dev_desc->dev, lba, cnt, buf) != cnt) {
 628                 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n",
 629                        __func__, "MBR", cnt, lba);
 630                 return 1;
 631         }
 632
 633         /* write Primary GPT */
 634         lba = GPT_PRIMARY_PARTITION_TABLE_LBA;
 635         cnt = 1;        /* GPT Header (1 block) */
 636         if (dev_desc->block_write(dev_desc->dev, lba, cnt, gpt_h) != cnt) {
 637                 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n",
 638                        __func__, "Primary GPT Header", cnt, lba);
 639                 return 1;
 640         }
 641
 642         lba = le64_to_cpu(gpt_h->partition_entry_lba);
 643         cnt = gpt_e_blk_cnt;
 644         if (dev_desc->block_write(dev_desc->dev, lba, cnt, gpt_e) != cnt) {
 645                 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n",
 646                        __func__, "Primary GPT Entries", cnt, lba);
 647                 return 1;
 648         }
 649
 650         prepare_backup_gpt_header(gpt_h);
 651
 652         /* write Backup GPT */
 653         lba = le64_to_cpu(gpt_h->partition_entry_lba);
 654         cnt = gpt_e_blk_cnt;
 655         if (dev_desc->block_write(dev_desc->dev, lba, cnt, gpt_e) != cnt) {
 656                 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n",
 657                        __func__, "Backup GPT Entries", cnt, lba);
 658                 return 1;
 659         }
 660
 661         lba = le64_to_cpu(gpt_h->my_lba);
 662         cnt = 1;        /* GPT Header (1 block) */
 663         if (dev_desc->block_write(dev_desc->dev, lba, cnt, gpt_h) != cnt) {
 664                 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n",
 665                        __func__, "Backup GPT Header", cnt, lba);
 666                 return 1;
 667         }
 668
 669         return 0;
 670 }
 671 #endif
 672
 673 /*
 674  * Private functions
 675  */
 676 /*
 677  * pmbr_part_valid(): Check for EFI partition signature
 678  *
 679  * Returns: 1 if EFI GPT partition type is found.
 680  */
 681 static int pmbr_part_valid(struct partition *part)
 682 {
 683         if (part->sys_ind == EFI_PMBR_OSTYPE_EFI_GPT &&
 684                 get_unaligned_le32(&part->start_sect) == 1UL) {
 685                 return 1;
 686         }
 687
 688         return 0;
 689 }
 690
 691 /*
 692  * is_pmbr_valid(): test Protective MBR for validity
 693  *
 694  * Returns: 1 if PMBR is valid, 0 otherwise.
 695  * Validity depends on two things:
 696  *  1) MSDOS signature is in the last two bytes of the MBR
 697  *  2) One partition of type 0xEE is found, checked by pmbr_part_valid()
 698  */
 699 static int is_pmbr_valid(legacy_mbr * mbr)
 700 {
 701         int i = 0;
 702
 703         if (!mbr || le16_to_cpu(mbr->signature) != MSDOS_MBR_SIGNATURE)
 704                 return 0;
 705
 706         for (i = 0; i < 4; i++) {
 707                 if (pmbr_part_valid(&mbr->partition_record[i])) {
 708                         return 1;
 709                 }
 710         }
 711         return 0;
 712 }
 713
 714 /**
 715  * is_gpt_valid() - tests one GPT header and PTEs for validity
 716  *
 717  * lba is the logical block address of the GPT header to test
 718  * gpt is a GPT header ptr, filled on return.
 719  * ptes is a PTEs ptr, filled on return.
 720  *
 721  * Description: returns 1 if valid,  0 on error.
 722  * If valid, returns pointers to PTEs.
 723  */
 724 static int is_gpt_valid(block_dev_desc_t *dev_desc, u64 lba,
 725                         gpt_header *pgpt_head, gpt_entry **pgpt_pte)
 726 {
 727         if (!dev_desc || !pgpt_head) {
 728                 printf("%s: Invalid Argument(s)\n", __func__);
 729                 return 0;
 730         }
 731
 732         /* Read GPT Header from device */
 733         if (dev_desc->block_read(dev_desc->dev, (lbaint_t)lba, 1, pgpt_head)
 734                         != 1) {
 735                 printf("*** ERROR: Can't read GPT header ***\n");
 736                 return 0;
 737         }
 738
 739         if (validate_gpt_header(pgpt_head, (lbaint_t)lba, dev_desc->lba))
 740                 return 0;
 741
 742         /* Read and allocate Partition Table Entries */
 743         *pgpt_pte = alloc_read_gpt_entries(dev_desc, pgpt_head);
 744         if (*pgpt_pte == NULL) {
 745                 printf("GPT: Failed to allocate memory for PTE\n");
 746                 return 0;
 747         }
 748
 749         if (validate_gpt_entries(pgpt_head, *pgpt_pte)) {
 750                 free(*pgpt_pte);
 751                 return 0;
 752         }
 753
 754         /* We're done, all's well */
 755         return 1;
 756 }
 757
 758 /**
 759  * alloc_read_gpt_entries(): reads partition entries from disk
 760  * @dev_desc
 761  * @gpt - GPT header
 762  *
 763  * Description: Returns ptes on success,  NULL on error.
 764  * Allocates space for PTEs based on information found in @gpt.
 765  * Notes: remember to free pte when you're done!
 766  */
 767 static gpt_entry *alloc_read_gpt_entries(block_dev_desc_t * dev_desc,
 768                                          gpt_header * pgpt_head)
 769 {
 770         size_t count = 0, blk_cnt;
 771         gpt_entry *pte = NULL;
 772
 773         if (!dev_desc || !pgpt_head) {
 774                 printf("%s: Invalid Argument(s)\n", __func__);
 775                 return NULL;
 776         }
 777
 778         count = le32_to_cpu(pgpt_head->num_partition_entries) *
 779                 le32_to_cpu(pgpt_head->sizeof_partition_entry);
 780
 781         debug("%s: count = %u * %u = %zu\n", __func__,
 782               (u32) le32_to_cpu(pgpt_head->num_partition_entries),
 783               (u32) le32_to_cpu(pgpt_head->sizeof_partition_entry), count);
 784
 785         /* Allocate memory for PTE, remember to FREE */
 786         if (count != 0) {
 787                 pte = memalign(ARCH_DMA_MINALIGN,
 788                                PAD_TO_BLOCKSIZE(count, dev_desc));
 789         }
 790
 791         if (count == 0 || pte == NULL) {
 792                 printf("%s: ERROR: Can't allocate 0x%zX "
 793                        "bytes for GPT Entries\n",
 794                         __func__, count);
 795                 return NULL;
 796         }
 797
 798         /* Read GPT Entries from device */
 799         blk_cnt = BLOCK_CNT(count, dev_desc);
 800         if (dev_desc->block_read (dev_desc->dev,
 801                 (lbaint_t)le64_to_cpu(pgpt_head->partition_entry_lba),
 802                 (lbaint_t) (blk_cnt), pte)
 803                 != blk_cnt) {
 804
 805                 printf("*** ERROR: Can't read GPT Entries ***\n");
 806                 free(pte);
 807                 return NULL;
 808         }
 809         return pte;
 810 }
 811
 812 /**
 813  * is_pte_valid(): validates a single Partition Table Entry
 814  * @gpt_entry - Pointer to a single Partition Table Entry
 815  *
 816  * Description: returns 1 if valid,  0 on error.
 817  */
 818 static int is_pte_valid(gpt_entry * pte)
 819 {
 820         efi_guid_t unused_guid;
 821
 822         if (!pte) {
 823                 printf("%s: Invalid Argument(s)\n", __func__);
 824                 return 0;
 825         }
 826
 827         /* Only one validation for now:
 828          * The GUID Partition Type != Unused Entry (ALL-ZERO)
 829          */
 830         memset(unused_guid.b, 0, sizeof(unused_guid.b));
 831
 832         if (memcmp(pte->partition_type_guid.b, unused_guid.b,
 833                 sizeof(unused_guid.b)) == 0) {
 834
 835                 debug("%s: Found an unused PTE GUID at 0x%08X\n", __func__,
 836                       (unsigned int)(uintptr_t)pte);
 837
 838                 return 0;
 839         } else {
 840                 return 1;
 841         }
 842 }
 843 #endif