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