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 <malloc.h> 18 #include <part_efi.h> 19 #include <linux/ctype.h> 20 21 DECLARE_GLOBAL_DATA_PTR; 22 23 #ifdef HAVE_BLOCK_DEVICE 24 /** 25 * efi_crc32() - EFI version of crc32 function 26 * @buf: buffer to calculate crc32 of 27 * @len - length of buf 28 * 29 * Description: Returns EFI-style CRC32 value for @buf 30 */ 31 static inline u32 efi_crc32(const void *buf, u32 len) 32 { 33 return crc32(0, buf, len); 34 } 35 36 /* 37 * Private function prototypes 38 */ 39 40 static int pmbr_part_valid(struct partition *part); 41 static int is_pmbr_valid(legacy_mbr * mbr); 42 static int is_gpt_valid(block_dev_desc_t *dev_desc, u64 lba, 43 gpt_header *pgpt_head, gpt_entry **pgpt_pte); 44 static gpt_entry *alloc_read_gpt_entries(block_dev_desc_t * dev_desc, 45 gpt_header * pgpt_head); 46 static int is_pte_valid(gpt_entry * pte); 47 48 static char *print_efiname(gpt_entry *pte) 49 { 50 static char name[PARTNAME_SZ + 1]; 51 int i; 52 for (i = 0; i < PARTNAME_SZ; i++) { 53 u8 c; 54 c = pte->partition_name[i] & 0xff; 55 c = (c && !isprint(c)) ? '.' : c; 56 name[i] = c; 57 } 58 name[PARTNAME_SZ] = 0; 59 return name; 60 } 61 62 static efi_guid_t system_guid = PARTITION_SYSTEM_GUID; 63 64 static inline int is_bootable(gpt_entry *p) 65 { 66 return p->attributes.fields.legacy_bios_bootable || 67 !memcmp(&(p->partition_type_guid), &system_guid, 68 sizeof(efi_guid_t)); 69 } 70 71 #ifdef CONFIG_EFI_PARTITION 72 /* 73 * Public Functions (include/part.h) 74 */ 75 76 void print_part_efi(block_dev_desc_t * dev_desc) 77 { 78 ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_head, 1, dev_desc->blksz); 79 gpt_entry *gpt_pte = NULL; 80 int i = 0; 81 char uuid[37]; 82 unsigned char *uuid_bin; 83 84 if (!dev_desc) { 85 printf("%s: Invalid Argument(s)\n", __func__); 86 return; 87 } 88 /* This function validates AND fills in the GPT header and PTE */ 89 if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA, 90 gpt_head, &gpt_pte) != 1) { 91 printf("%s: *** ERROR: Invalid GPT ***\n", __func__); 92 if (is_gpt_valid(dev_desc, (dev_desc->lba - 1), 93 gpt_head, &gpt_pte) != 1) { 94 printf("%s: *** ERROR: Invalid Backup GPT ***\n", 95 __func__); 96 return; 97 } else { 98 printf("%s: *** Using Backup GPT ***\n", 99 __func__); 100 } 101 } 102 103 debug("%s: gpt-entry at %p\n", __func__, gpt_pte); 104 105 printf("Part\tStart LBA\tEnd LBA\t\tName\n"); 106 printf("\tAttributes\n"); 107 printf("\tType GUID\n"); 108 printf("\tPartition GUID\n"); 109 110 for (i = 0; i < le32_to_cpu(gpt_head->num_partition_entries); i++) { 111 /* Stop at the first non valid PTE */ 112 if (!is_pte_valid(&gpt_pte[i])) 113 break; 114 115 printf("%3d\t0x%08llx\t0x%08llx\t\"%s\"\n", (i + 1), 116 le64_to_cpu(gpt_pte[i].starting_lba), 117 le64_to_cpu(gpt_pte[i].ending_lba), 118 print_efiname(&gpt_pte[i])); 119 printf("\tattrs:\t0x%016llx\n", gpt_pte[i].attributes.raw); 120 uuid_bin = (unsigned char *)gpt_pte[i].partition_type_guid.b; 121 uuid_bin_to_str(uuid_bin, uuid, UUID_STR_FORMAT_GUID); 122 printf("\ttype:\t%s\n", uuid); 123 uuid_bin = (unsigned char *)gpt_pte[i].unique_partition_guid.b; 124 uuid_bin_to_str(uuid_bin, uuid, UUID_STR_FORMAT_GUID); 125 printf("\tguid:\t%s\n", uuid); 126 } 127 128 /* Remember to free pte */ 129 free(gpt_pte); 130 return; 131 } 132 133 int get_partition_info_efi(block_dev_desc_t * dev_desc, int part, 134 disk_partition_t * info) 135 { 136 ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_head, 1, dev_desc->blksz); 137 gpt_entry *gpt_pte = NULL; 138 139 /* "part" argument must be at least 1 */ 140 if (!dev_desc || !info || part < 1) { 141 printf("%s: Invalid Argument(s)\n", __func__); 142 return -1; 143 } 144 145 /* This function validates AND fills in the GPT header and PTE */ 146 if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA, 147 gpt_head, &gpt_pte) != 1) { 148 printf("%s: *** ERROR: Invalid GPT ***\n", __func__); 149 if (is_gpt_valid(dev_desc, (dev_desc->lba - 1), 150 gpt_head, &gpt_pte) != 1) { 151 printf("%s: *** ERROR: Invalid Backup GPT ***\n", 152 __func__); 153 return -1; 154 } else { 155 printf("%s: *** Using Backup GPT ***\n", 156 __func__); 157 } 158 } 159 160 if (part > le32_to_cpu(gpt_head->num_partition_entries) || 161 !is_pte_valid(&gpt_pte[part - 1])) { 162 debug("%s: *** ERROR: Invalid partition number %d ***\n", 163 __func__, part); 164 free(gpt_pte); 165 return -1; 166 } 167 168 /* The 'lbaint_t' casting may limit the maximum disk size to 2 TB */ 169 info->start = (lbaint_t)le64_to_cpu(gpt_pte[part - 1].starting_lba); 170 /* The ending LBA is inclusive, to calculate size, add 1 to it */ 171 info->size = (lbaint_t)le64_to_cpu(gpt_pte[part - 1].ending_lba) + 1 172 - info->start; 173 info->blksz = dev_desc->blksz; 174 175 sprintf((char *)info->name, "%s", 176 print_efiname(&gpt_pte[part - 1])); 177 sprintf((char *)info->type, "U-Boot"); 178 info->bootable = is_bootable(&gpt_pte[part - 1]); 179 #ifdef CONFIG_PARTITION_UUIDS 180 uuid_bin_to_str(gpt_pte[part - 1].unique_partition_guid.b, info->uuid, 181 UUID_STR_FORMAT_GUID); 182 #endif 183 184 debug("%s: start 0x" LBAF ", size 0x" LBAF ", name %s", __func__, 185 info->start, info->size, info->name); 186 187 /* Remember to free pte */ 188 free(gpt_pte); 189 return 0; 190 } 191 192 int test_part_efi(block_dev_desc_t * dev_desc) 193 { 194 ALLOC_CACHE_ALIGN_BUFFER_PAD(legacy_mbr, legacymbr, 1, dev_desc->blksz); 195 196 /* Read legacy MBR from block 0 and validate it */ 197 if ((dev_desc->block_read(dev_desc->dev, 0, 1, (ulong *)legacymbr) != 1) 198 || (is_pmbr_valid(legacymbr) != 1)) { 199 return -1; 200 } 201 return 0; 202 } 203 204 /** 205 * set_protective_mbr(): Set the EFI protective MBR 206 * @param dev_desc - block device descriptor 207 * 208 * @return - zero on success, otherwise error 209 */ 210 static int set_protective_mbr(block_dev_desc_t *dev_desc) 211 { 212 /* Setup the Protective MBR */ 213 ALLOC_CACHE_ALIGN_BUFFER(legacy_mbr, p_mbr, 1); 214 memset(p_mbr, 0, sizeof(*p_mbr)); 215 216 if (p_mbr == NULL) { 217 printf("%s: calloc failed!\n", __func__); 218 return -1; 219 } 220 /* Append signature */ 221 p_mbr->signature = MSDOS_MBR_SIGNATURE; 222 p_mbr->partition_record[0].sys_ind = EFI_PMBR_OSTYPE_EFI_GPT; 223 p_mbr->partition_record[0].start_sect = 1; 224 p_mbr->partition_record[0].nr_sects = (u32) dev_desc->lba; 225 226 /* Write MBR sector to the MMC device */ 227 if (dev_desc->block_write(dev_desc->dev, 0, 1, p_mbr) != 1) { 228 printf("** Can't write to device %d **\n", 229 dev_desc->dev); 230 return -1; 231 } 232 233 return 0; 234 } 235 236 int write_gpt_table(block_dev_desc_t *dev_desc, 237 gpt_header *gpt_h, gpt_entry *gpt_e) 238 { 239 const int pte_blk_cnt = BLOCK_CNT((gpt_h->num_partition_entries 240 * sizeof(gpt_entry)), dev_desc); 241 u32 calc_crc32; 242 u64 val; 243 244 debug("max lba: %x\n", (u32) dev_desc->lba); 245 /* Setup the Protective MBR */ 246 if (set_protective_mbr(dev_desc) < 0) 247 goto err; 248 249 /* Generate CRC for the Primary GPT Header */ 250 calc_crc32 = efi_crc32((const unsigned char *)gpt_e, 251 le32_to_cpu(gpt_h->num_partition_entries) * 252 le32_to_cpu(gpt_h->sizeof_partition_entry)); 253 gpt_h->partition_entry_array_crc32 = cpu_to_le32(calc_crc32); 254 255 calc_crc32 = efi_crc32((const unsigned char *)gpt_h, 256 le32_to_cpu(gpt_h->header_size)); 257 gpt_h->header_crc32 = cpu_to_le32(calc_crc32); 258 259 /* Write the First GPT to the block right after the Legacy MBR */ 260 if (dev_desc->block_write(dev_desc->dev, 1, 1, gpt_h) != 1) 261 goto err; 262 263 if (dev_desc->block_write(dev_desc->dev, 2, pte_blk_cnt, gpt_e) 264 != pte_blk_cnt) 265 goto err; 266 267 /* recalculate the values for the Backup GPT Header */ 268 val = le64_to_cpu(gpt_h->my_lba); 269 gpt_h->my_lba = gpt_h->alternate_lba; 270 gpt_h->alternate_lba = cpu_to_le64(val); 271 gpt_h->header_crc32 = 0; 272 273 calc_crc32 = efi_crc32((const unsigned char *)gpt_h, 274 le32_to_cpu(gpt_h->header_size)); 275 gpt_h->header_crc32 = cpu_to_le32(calc_crc32); 276 277 if (dev_desc->block_write(dev_desc->dev, 278 (lbaint_t)le64_to_cpu(gpt_h->last_usable_lba) 279 + 1, 280 pte_blk_cnt, gpt_e) != pte_blk_cnt) 281 goto err; 282 283 if (dev_desc->block_write(dev_desc->dev, 284 (lbaint_t)le64_to_cpu(gpt_h->my_lba), 1, 285 gpt_h) != 1) 286 goto err; 287 288 debug("GPT successfully written to block device!\n"); 289 return 0; 290 291 err: 292 printf("** Can't write to device %d **\n", dev_desc->dev); 293 return -1; 294 } 295 296 int gpt_fill_pte(gpt_header *gpt_h, gpt_entry *gpt_e, 297 disk_partition_t *partitions, int parts) 298 { 299 lbaint_t offset = (lbaint_t)le64_to_cpu(gpt_h->first_usable_lba); 300 lbaint_t start; 301 lbaint_t last_usable_lba = (lbaint_t) 302 le64_to_cpu(gpt_h->last_usable_lba); 303 int i, k; 304 size_t efiname_len, dosname_len; 305 #ifdef CONFIG_PARTITION_UUIDS 306 char *str_uuid; 307 unsigned char *bin_uuid; 308 #endif 309 310 for (i = 0; i < parts; i++) { 311 /* partition starting lba */ 312 start = partitions[i].start; 313 if (start && (start < offset)) { 314 printf("Partition overlap\n"); 315 return -1; 316 } 317 if (start) { 318 gpt_e[i].starting_lba = cpu_to_le64(start); 319 offset = start + partitions[i].size; 320 } else { 321 gpt_e[i].starting_lba = cpu_to_le64(offset); 322 offset += partitions[i].size; 323 } 324 if (offset >= last_usable_lba) { 325 printf("Partitions layout exceds disk size\n"); 326 return -1; 327 } 328 /* partition ending lba */ 329 if ((i == parts - 1) && (partitions[i].size == 0)) 330 /* extend the last partition to maximuim */ 331 gpt_e[i].ending_lba = gpt_h->last_usable_lba; 332 else 333 gpt_e[i].ending_lba = cpu_to_le64(offset - 1); 334 335 /* partition type GUID */ 336 memcpy(gpt_e[i].partition_type_guid.b, 337 &PARTITION_BASIC_DATA_GUID, 16); 338 339 #ifdef CONFIG_PARTITION_UUIDS 340 str_uuid = partitions[i].uuid; 341 bin_uuid = gpt_e[i].unique_partition_guid.b; 342 343 if (uuid_str_to_bin(str_uuid, bin_uuid, UUID_STR_FORMAT_STD)) { 344 printf("Partition no. %d: invalid guid: %s\n", 345 i, str_uuid); 346 return -1; 347 } 348 #endif 349 350 /* partition attributes */ 351 memset(&gpt_e[i].attributes, 0, 352 sizeof(gpt_entry_attributes)); 353 354 /* partition name */ 355 efiname_len = sizeof(gpt_e[i].partition_name) 356 / sizeof(efi_char16_t); 357 dosname_len = sizeof(partitions[i].name); 358 359 memset(gpt_e[i].partition_name, 0, 360 sizeof(gpt_e[i].partition_name)); 361 362 for (k = 0; k < min(dosname_len, efiname_len); k++) 363 gpt_e[i].partition_name[k] = 364 (efi_char16_t)(partitions[i].name[k]); 365 366 debug("%s: name: %s offset[%d]: 0x" LBAF 367 " 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, u64 lba, 492 gpt_header *pgpt_head, gpt_entry **pgpt_pte) 493 { 494 u32 crc32_backup = 0; 495 u32 calc_crc32; 496 u64 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, (lbaint_t)lba, 1, pgpt_head) 505 != 1) { 506 printf("*** ERROR: Can't read GPT header ***\n"); 507 return 0; 508 } 509 510 /* Check the GPT header signature */ 511 if (le64_to_cpu(pgpt_head->signature) != GPT_HEADER_SIGNATURE) { 512 printf("GUID Partition Table Header signature is wrong:" 513 "0x%llX != 0x%llX\n", 514 le64_to_cpu(pgpt_head->signature), 515 GPT_HEADER_SIGNATURE); 516 return 0; 517 } 518 519 /* Check the GUID Partition Table CRC */ 520 memcpy(&crc32_backup, &pgpt_head->header_crc32, sizeof(crc32_backup)); 521 memset(&pgpt_head->header_crc32, 0, sizeof(pgpt_head->header_crc32)); 522 523 calc_crc32 = efi_crc32((const unsigned char *)pgpt_head, 524 le32_to_cpu(pgpt_head->header_size)); 525 526 memcpy(&pgpt_head->header_crc32, &crc32_backup, sizeof(crc32_backup)); 527 528 if (calc_crc32 != le32_to_cpu(crc32_backup)) { 529 printf("GUID Partition Table Header CRC is wrong:" 530 "0x%x != 0x%x\n", 531 le32_to_cpu(crc32_backup), calc_crc32); 532 return 0; 533 } 534 535 /* Check that the my_lba entry points to the LBA that contains the GPT */ 536 if (le64_to_cpu(pgpt_head->my_lba) != lba) { 537 printf("GPT: my_lba incorrect: %llX != %llX\n", 538 le64_to_cpu(pgpt_head->my_lba), 539 lba); 540 return 0; 541 } 542 543 /* Check the first_usable_lba and last_usable_lba are within the disk. */ 544 lastlba = (u64)dev_desc->lba; 545 if (le64_to_cpu(pgpt_head->first_usable_lba) > lastlba) { 546 printf("GPT: first_usable_lba incorrect: %llX > %llX\n", 547 le64_to_cpu(pgpt_head->first_usable_lba), lastlba); 548 return 0; 549 } 550 if (le64_to_cpu(pgpt_head->last_usable_lba) > lastlba) { 551 printf("GPT: last_usable_lba incorrect: %llX > %llX\n", 552 le64_to_cpu(pgpt_head->last_usable_lba), lastlba); 553 return 0; 554 } 555 556 debug("GPT: first_usable_lba: %llX last_usable_lba %llX last lba %llX\n", 557 le64_to_cpu(pgpt_head->first_usable_lba), 558 le64_to_cpu(pgpt_head->last_usable_lba), lastlba); 559 560 /* Read and allocate Partition Table Entries */ 561 *pgpt_pte = alloc_read_gpt_entries(dev_desc, pgpt_head); 562 if (*pgpt_pte == NULL) { 563 printf("GPT: Failed to allocate memory for PTE\n"); 564 return 0; 565 } 566 567 /* Check the GUID Partition Table Entry Array CRC */ 568 calc_crc32 = efi_crc32((const unsigned char *)*pgpt_pte, 569 le32_to_cpu(pgpt_head->num_partition_entries) * 570 le32_to_cpu(pgpt_head->sizeof_partition_entry)); 571 572 if (calc_crc32 != le32_to_cpu(pgpt_head->partition_entry_array_crc32)) { 573 printf("GUID Partition Table Entry Array CRC is wrong:" 574 "0x%x != 0x%x\n", 575 le32_to_cpu(pgpt_head->partition_entry_array_crc32), 576 calc_crc32); 577 578 free(*pgpt_pte); 579 return 0; 580 } 581 582 /* We're done, all's well */ 583 return 1; 584 } 585 586 /** 587 * alloc_read_gpt_entries(): reads partition entries from disk 588 * @dev_desc 589 * @gpt - GPT header 590 * 591 * Description: Returns ptes on success, NULL on error. 592 * Allocates space for PTEs based on information found in @gpt. 593 * Notes: remember to free pte when you're done! 594 */ 595 static gpt_entry *alloc_read_gpt_entries(block_dev_desc_t * dev_desc, 596 gpt_header * pgpt_head) 597 { 598 size_t count = 0, blk_cnt; 599 gpt_entry *pte = NULL; 600 601 if (!dev_desc || !pgpt_head) { 602 printf("%s: Invalid Argument(s)\n", __func__); 603 return NULL; 604 } 605 606 count = le32_to_cpu(pgpt_head->num_partition_entries) * 607 le32_to_cpu(pgpt_head->sizeof_partition_entry); 608 609 debug("%s: count = %u * %u = %zu\n", __func__, 610 (u32) le32_to_cpu(pgpt_head->num_partition_entries), 611 (u32) le32_to_cpu(pgpt_head->sizeof_partition_entry), count); 612 613 /* Allocate memory for PTE, remember to FREE */ 614 if (count != 0) { 615 pte = memalign(ARCH_DMA_MINALIGN, 616 PAD_TO_BLOCKSIZE(count, dev_desc)); 617 } 618 619 if (count == 0 || pte == NULL) { 620 printf("%s: ERROR: Can't allocate 0x%zX " 621 "bytes for GPT Entries\n", 622 __func__, count); 623 return NULL; 624 } 625 626 /* Read GPT Entries from device */ 627 blk_cnt = BLOCK_CNT(count, dev_desc); 628 if (dev_desc->block_read (dev_desc->dev, 629 (lbaint_t)le64_to_cpu(pgpt_head->partition_entry_lba), 630 (lbaint_t) (blk_cnt), pte) 631 != blk_cnt) { 632 633 printf("*** ERROR: Can't read GPT Entries ***\n"); 634 free(pte); 635 return NULL; 636 } 637 return pte; 638 } 639 640 /** 641 * is_pte_valid(): validates a single Partition Table Entry 642 * @gpt_entry - Pointer to a single Partition Table Entry 643 * 644 * Description: returns 1 if valid, 0 on error. 645 */ 646 static int is_pte_valid(gpt_entry * pte) 647 { 648 efi_guid_t unused_guid; 649 650 if (!pte) { 651 printf("%s: Invalid Argument(s)\n", __func__); 652 return 0; 653 } 654 655 /* Only one validation for now: 656 * The GUID Partition Type != Unused Entry (ALL-ZERO) 657 */ 658 memset(unused_guid.b, 0, sizeof(unused_guid.b)); 659 660 if (memcmp(pte->partition_type_guid.b, unused_guid.b, 661 sizeof(unused_guid.b)) == 0) { 662 663 debug("%s: Found an unused PTE GUID at 0x%08X\n", __func__, 664 (unsigned int)(uintptr_t)pte); 665 666 return 0; 667 } else { 668 return 1; 669 } 670 } 671 #endif 672