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