1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (C) 2008 RuggedCom, Inc.
9 * when CONFIG_SYS_64BIT_LBA is not defined, lbaint_t is 32 bits; this
10 * limits the maximum size of addressable storage to < 2 tebibytes
13 #define LOG_CATEGORY LOGC_FS
20 #include <asm/cache.h>
21 #include <asm/global_data.h>
22 #include <asm/unaligned.h>
29 #include <dm/ofnode.h>
30 #include <linux/compiler.h>
31 #include <linux/ctype.h>
32 #include <u-boot/crc.h>
34 /* GUID for basic data partitons */
35 #if CONFIG_IS_ENABLED(EFI_PARTITION)
36 static const efi_guid_t partition_basic_data_guid = PARTITION_BASIC_DATA_GUID;
40 * efi_crc32() - EFI version of crc32 function
41 * @buf: buffer to calculate crc32 of
42 * @len - length of buf
44 * Description: Returns EFI-style CRC32 value for @buf
46 static inline u32 efi_crc32(const void *buf, u32 len)
48 return crc32(0, buf, len);
52 * Private function prototypes
55 static int pmbr_part_valid(struct partition *part);
56 static int is_pmbr_valid(legacy_mbr * mbr);
57 static int is_gpt_valid(struct blk_desc *desc, u64 lba, gpt_header *pgpt_head,
58 gpt_entry **pgpt_pte);
59 static gpt_entry *alloc_read_gpt_entries(struct blk_desc *desc,
60 gpt_header *pgpt_head);
61 static int is_pte_valid(gpt_entry * pte);
62 static int find_valid_gpt(struct blk_desc *desc, gpt_header *gpt_head,
63 gpt_entry **pgpt_pte);
65 static char *print_efiname(gpt_entry *pte)
67 static char name[PARTNAME_SZ + 1];
69 for (i = 0; i < PARTNAME_SZ; i++) {
71 c = pte->partition_name[i] & 0xff;
72 c = (c && !isprint(c)) ? '.' : c;
75 name[PARTNAME_SZ] = 0;
79 static const efi_guid_t system_guid = PARTITION_SYSTEM_GUID;
81 static int get_bootable(gpt_entry *p)
85 if (!memcmp(&p->partition_type_guid, &system_guid, sizeof(efi_guid_t)))
86 ret |= PART_EFI_SYSTEM_PARTITION;
87 if (p->attributes.fields.legacy_bios_bootable)
92 static int validate_gpt_header(gpt_header *gpt_h, lbaint_t lba,
95 uint32_t crc32_backup = 0;
98 /* Check the GPT header signature */
99 if (le64_to_cpu(gpt_h->signature) != GPT_HEADER_SIGNATURE_UBOOT) {
100 log_debug("%s signature is wrong: %#llX != %#llX\n",
101 "GUID Partition Table Header",
102 le64_to_cpu(gpt_h->signature),
103 GPT_HEADER_SIGNATURE_UBOOT);
107 /* Check the GUID Partition Table CRC */
108 memcpy(&crc32_backup, &gpt_h->header_crc32, sizeof(crc32_backup));
109 memset(&gpt_h->header_crc32, 0, sizeof(gpt_h->header_crc32));
111 calc_crc32 = efi_crc32((const unsigned char *)gpt_h,
112 le32_to_cpu(gpt_h->header_size));
114 memcpy(&gpt_h->header_crc32, &crc32_backup, sizeof(crc32_backup));
116 if (calc_crc32 != le32_to_cpu(crc32_backup)) {
117 log_debug("%s: CRC is wrong: %#x != %#x\n",
118 "GUID Partition Table Header",
119 le32_to_cpu(crc32_backup), calc_crc32);
124 * Check that the my_lba entry points to the LBA that contains the GPT
126 if (le64_to_cpu(gpt_h->my_lba) != lba) {
127 log_debug("GPT: my_lba incorrect: %llX != " LBAF "\n",
128 le64_to_cpu(gpt_h->my_lba), lba);
133 * Check that the first_usable_lba and that the last_usable_lba are
136 if (le64_to_cpu(gpt_h->first_usable_lba) > lastlba) {
137 log_debug("GPT: first_usable_lba incorrect: %llX > " LBAF "\n",
138 le64_to_cpu(gpt_h->first_usable_lba), lastlba);
141 if (le64_to_cpu(gpt_h->last_usable_lba) > lastlba) {
142 log_debug("GPT: last_usable_lba incorrect: %llX > " LBAF "\n",
143 le64_to_cpu(gpt_h->last_usable_lba), lastlba);
147 debug("GPT: first_usable_lba: %llX last_usable_lba: %llX last lba: "
148 LBAF "\n", le64_to_cpu(gpt_h->first_usable_lba),
149 le64_to_cpu(gpt_h->last_usable_lba), lastlba);
154 static int validate_gpt_entries(gpt_header *gpt_h, gpt_entry *gpt_e)
158 /* Check the GUID Partition Table Entry Array CRC */
159 calc_crc32 = efi_crc32((const unsigned char *)gpt_e,
160 le32_to_cpu(gpt_h->num_partition_entries) *
161 le32_to_cpu(gpt_h->sizeof_partition_entry));
163 if (calc_crc32 != le32_to_cpu(gpt_h->partition_entry_array_crc32)) {
164 log_debug("%s: %#x != %#x\n",
165 "GUID Partition Table Entry Array CRC is wrong",
166 le32_to_cpu(gpt_h->partition_entry_array_crc32),
174 static void prepare_backup_gpt_header(gpt_header *gpt_h)
179 /* recalculate the values for the Backup GPT Header */
180 val = le64_to_cpu(gpt_h->my_lba);
181 gpt_h->my_lba = gpt_h->alternate_lba;
182 gpt_h->alternate_lba = cpu_to_le64(val);
183 gpt_h->partition_entry_lba =
184 cpu_to_le64(le64_to_cpu(gpt_h->last_usable_lba) + 1);
185 gpt_h->header_crc32 = 0;
187 calc_crc32 = efi_crc32((const unsigned char *)gpt_h,
188 le32_to_cpu(gpt_h->header_size));
189 gpt_h->header_crc32 = cpu_to_le32(calc_crc32);
192 #if CONFIG_IS_ENABLED(EFI_PARTITION)
194 * Public Functions (include/part.h)
198 * UUID is displayed as 32 hexadecimal digits, in 5 groups,
199 * separated by hyphens, in the form 8-4-4-4-12 for a total of 36 characters
201 int get_disk_guid(struct blk_desc *desc, char *guid)
203 ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_head, 1, desc->blksz);
204 gpt_entry *gpt_pte = NULL;
205 unsigned char *guid_bin;
207 /* This function validates AND fills in the GPT header and PTE */
208 if (find_valid_gpt(desc, gpt_head, &gpt_pte) != 1)
211 guid_bin = gpt_head->disk_guid.b;
212 uuid_bin_to_str(guid_bin, guid, UUID_STR_FORMAT_GUID);
214 /* Remember to free pte */
219 void part_print_efi(struct blk_desc *desc)
221 ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_head, 1, desc->blksz);
222 gpt_entry *gpt_pte = NULL;
226 /* This function validates AND fills in the GPT header and PTE */
227 if (find_valid_gpt(desc, gpt_head, &gpt_pte) != 1)
230 debug("%s: gpt-entry at %p\n", __func__, gpt_pte);
232 printf("Part\tStart LBA\tEnd LBA\t\tName\n");
233 printf("\tAttributes\n");
234 printf("\tType GUID\n");
235 printf("\tPartition GUID\n");
237 for (i = 0; i < le32_to_cpu(gpt_head->num_partition_entries); i++) {
238 /* Skip invalid PTE */
239 if (!is_pte_valid(&gpt_pte[i]))
242 printf("%3d\t0x%08llx\t0x%08llx\t\"%s\"\n", (i + 1),
243 le64_to_cpu(gpt_pte[i].starting_lba),
244 le64_to_cpu(gpt_pte[i].ending_lba),
245 print_efiname(&gpt_pte[i]));
246 printf("\tattrs:\t0x%016llx\n", gpt_pte[i].attributes.raw);
247 uuid = (unsigned char *)gpt_pte[i].partition_type_guid.b;
248 if (IS_ENABLED(CONFIG_PARTITION_TYPE_GUID))
249 printf("\ttype:\t%pUl\n\t\t(%pUs)\n", uuid, uuid);
251 printf("\ttype:\t%pUl\n", uuid);
252 uuid = (unsigned char *)gpt_pte[i].unique_partition_guid.b;
253 printf("\tguid:\t%pUl\n", uuid);
256 /* Remember to free pte */
261 int part_get_info_efi(struct blk_desc *desc, int part,
262 struct disk_partition *info)
264 ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_head, 1, desc->blksz);
265 gpt_entry *gpt_pte = NULL;
267 /* "part" argument must be at least 1 */
269 log_debug("Invalid Argument(s)\n");
273 /* This function validates AND fills in the GPT header and PTE */
274 if (find_valid_gpt(desc, gpt_head, &gpt_pte) != 1)
277 if (part > le32_to_cpu(gpt_head->num_partition_entries) ||
278 !is_pte_valid(&gpt_pte[part - 1])) {
279 log_debug("Invalid partition number %d\n", part);
284 /* The 'lbaint_t' casting may limit the maximum disk size to 2 TB */
285 info->start = (lbaint_t)le64_to_cpu(gpt_pte[part - 1].starting_lba);
286 /* The ending LBA is inclusive, to calculate size, add 1 to it */
287 info->size = (lbaint_t)le64_to_cpu(gpt_pte[part - 1].ending_lba) + 1
289 info->blksz = desc->blksz;
291 snprintf((char *)info->name, sizeof(info->name), "%s",
292 print_efiname(&gpt_pte[part - 1]));
293 strcpy((char *)info->type, "U-Boot");
294 info->bootable = get_bootable(&gpt_pte[part - 1]);
295 if (CONFIG_IS_ENABLED(PARTITION_UUIDS)) {
296 uuid_bin_to_str(gpt_pte[part - 1].unique_partition_guid.b,
297 (char *)disk_partition_uuid(info),
298 UUID_STR_FORMAT_GUID);
300 if (IS_ENABLED(CONFIG_PARTITION_TYPE_GUID)) {
301 uuid_bin_to_str(gpt_pte[part - 1].partition_type_guid.b,
302 (char *)disk_partition_type_uuid(info),
303 UUID_STR_FORMAT_GUID);
306 log_debug("start 0x" LBAF ", size 0x" LBAF ", name %s\n", info->start,
307 info->size, info->name);
309 /* Remember to free pte */
314 static int part_test_efi(struct blk_desc *desc)
316 ALLOC_CACHE_ALIGN_BUFFER_PAD(legacy_mbr, legacymbr, 1, desc->blksz);
318 /* Read legacy MBR from block 0 and validate it */
319 if ((blk_dread(desc, 0, 1, (ulong *)legacymbr) != 1)
320 || (is_pmbr_valid(legacymbr) != 1)) {
327 * set_protective_mbr(): Set the EFI protective MBR
328 * @param desc - block device descriptor
330 * Return: - zero on success, otherwise error
332 static int set_protective_mbr(struct blk_desc *desc)
334 /* Setup the Protective MBR */
335 ALLOC_CACHE_ALIGN_BUFFER_PAD(legacy_mbr, p_mbr, 1, desc->blksz);
337 log_debug("calloc failed!\n");
341 /* Read MBR to backup boot code if it exists */
342 if (blk_dread(desc, 0, 1, p_mbr) != 1) {
343 log_debug("** Can't read from device %d **\n",
348 /* Clear all data in MBR except of backed up boot code */
349 memset((char *)p_mbr + MSDOS_MBR_BOOT_CODE_SIZE, 0, sizeof(*p_mbr) -
350 MSDOS_MBR_BOOT_CODE_SIZE);
352 /* Append signature */
353 p_mbr->signature = MSDOS_MBR_SIGNATURE;
354 p_mbr->partition_record[0].sys_ind = EFI_PMBR_OSTYPE_EFI_GPT;
355 p_mbr->partition_record[0].start_sect = 1;
356 p_mbr->partition_record[0].nr_sects = (u32)desc->lba - 1;
358 /* Write MBR sector to the MMC device */
359 if (blk_dwrite(desc, 0, 1, p_mbr) != 1) {
360 log_debug("** Can't write to device %d **\n", desc->devnum);
367 int write_gpt_table(struct blk_desc *desc, gpt_header *gpt_h, gpt_entry *gpt_e)
369 const int pte_blk_cnt = BLOCK_CNT((gpt_h->num_partition_entries
370 * sizeof(gpt_entry)), desc);
373 debug("max lba: %x\n", (u32)desc->lba);
374 /* Setup the Protective MBR */
375 if (set_protective_mbr(desc) < 0)
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);
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);
388 /* Write the First GPT to the block right after the Legacy MBR */
389 if (blk_dwrite(desc, 1, 1, gpt_h) != 1)
392 if (blk_dwrite(desc, le64_to_cpu(gpt_h->partition_entry_lba),
393 pte_blk_cnt, gpt_e) != pte_blk_cnt)
396 prepare_backup_gpt_header(gpt_h);
398 if (blk_dwrite(desc, (lbaint_t)le64_to_cpu(gpt_h->last_usable_lba)
399 + 1, pte_blk_cnt, gpt_e) != pte_blk_cnt)
402 if (blk_dwrite(desc, (lbaint_t)le64_to_cpu(gpt_h->my_lba), 1,
406 debug("GPT successfully written to block device!\n");
410 log_debug("** Can't write to device %d **\n", desc->devnum);
414 int gpt_fill_pte(struct blk_desc *desc,
415 gpt_header *gpt_h, gpt_entry *gpt_e,
416 struct disk_partition *partitions, int parts)
418 lbaint_t offset = (lbaint_t)le64_to_cpu(gpt_h->first_usable_lba);
419 lbaint_t last_usable_lba = (lbaint_t)
420 le64_to_cpu(gpt_h->last_usable_lba);
422 size_t efiname_len, dosname_len;
423 unsigned char *bin_uuid;
424 #ifdef CONFIG_PARTITION_TYPE_GUID
426 unsigned char *bin_type_guid;
428 size_t hdr_start = gpt_h->my_lba;
429 size_t hdr_end = hdr_start + 1;
431 size_t pte_start = gpt_h->partition_entry_lba;
432 size_t pte_end = pte_start +
433 gpt_h->num_partition_entries * gpt_h->sizeof_partition_entry /
436 for (i = 0; i < parts; i++) {
437 /* partition starting lba */
438 lbaint_t start = partitions[i].start;
439 lbaint_t size = partitions[i].size;
442 offset = start + size;
449 * If our partition overlaps with either the GPT
450 * header, or the partition entry, reject it.
452 if (((start < hdr_end && hdr_start < (start + size)) ||
453 (start < pte_end && pte_start < (start + size)))) {
454 log_debug("Partition overlap\n");
458 gpt_e[i].starting_lba = cpu_to_le64(start);
460 if (offset > (last_usable_lba + 1)) {
461 log_debug("Partitions layout exceeds disk size\n");
464 /* partition ending lba */
465 if ((i == parts - 1) && (size == 0))
466 /* extend the last partition to maximuim */
467 gpt_e[i].ending_lba = gpt_h->last_usable_lba;
469 gpt_e[i].ending_lba = cpu_to_le64(offset - 1);
471 #ifdef CONFIG_PARTITION_TYPE_GUID
472 str_type_guid = partitions[i].type_guid;
473 bin_type_guid = gpt_e[i].partition_type_guid.b;
474 if (strlen(str_type_guid)) {
475 if (uuid_str_to_bin(str_type_guid, bin_type_guid,
476 UUID_STR_FORMAT_GUID)) {
477 log_debug("Partition no. %d: invalid type guid: %s\n",
482 /* default partition type GUID */
483 memcpy(bin_type_guid,
484 &partition_basic_data_guid, 16);
487 /* partition type GUID */
488 memcpy(gpt_e[i].partition_type_guid.b,
489 &partition_basic_data_guid, 16);
492 if (CONFIG_IS_ENABLED(PARTITION_UUIDS)) {
493 const char *str_uuid;
495 str_uuid = disk_partition_uuid(&partitions[i]);
496 bin_uuid = gpt_e[i].unique_partition_guid.b;
498 if (uuid_str_to_bin(str_uuid, bin_uuid,
499 UUID_STR_FORMAT_GUID)) {
500 log_debug("Partition no. %d: invalid guid: %s\n",
506 /* partition attributes */
507 memset(&gpt_e[i].attributes, 0,
508 sizeof(gpt_entry_attributes));
510 if (partitions[i].bootable & PART_BOOTABLE)
511 gpt_e[i].attributes.fields.legacy_bios_bootable = 1;
514 efiname_len = sizeof(gpt_e[i].partition_name)
515 / sizeof(efi_char16_t);
516 dosname_len = sizeof(partitions[i].name);
518 memset(gpt_e[i].partition_name, 0,
519 sizeof(gpt_e[i].partition_name));
521 for (k = 0; k < min(dosname_len, efiname_len); k++)
522 gpt_e[i].partition_name[k] =
523 (efi_char16_t)(partitions[i].name[k]);
525 debug("%s: name: %s offset[%d]: 0x" LBAF
526 " size[%d]: 0x" LBAF "\n",
527 __func__, partitions[i].name, i,
534 static uint32_t partition_entries_offset(struct blk_desc *desc)
536 uint32_t offset_blks = 2;
537 uint32_t __maybe_unused offset_bytes;
538 int __maybe_unused config_offset;
540 #if defined(CONFIG_EFI_PARTITION_ENTRIES_OFF)
542 * Some architectures require their SPL loader at a fixed
543 * address within the first 16KB of the disk. To avoid an
544 * overlap with the partition entries of the EFI partition
545 * table, the first safe offset (in bytes, from the start of
546 * the disk) for the entries can be set in
547 * CONFIG_EFI_PARTITION_ENTRIES_OFF.
550 PAD_TO_BLOCKSIZE(CONFIG_EFI_PARTITION_ENTRIES_OFF, desc);
551 offset_blks = offset_bytes / desc->blksz;
554 #if defined(CONFIG_OF_CONTROL)
556 * Allow the offset of the first partition entires (in bytes
557 * from the start of the device) to be specified as a property
558 * of the device tree '/config' node.
560 config_offset = ofnode_conf_read_int(
561 "u-boot,efi-partition-entries-offset", -EINVAL);
562 if (config_offset != -EINVAL) {
563 offset_bytes = PAD_TO_BLOCKSIZE(config_offset, desc);
564 offset_blks = offset_bytes / desc->blksz;
568 debug("efi: partition entries offset (in blocks): %d\n", offset_blks);
571 * The earliest LBA this can be at is LBA#2 (i.e. right behind
572 * the (protective) MBR and the GPT header.
580 int gpt_fill_header(struct blk_desc *desc, gpt_header *gpt_h, char *str_guid,
583 gpt_h->signature = cpu_to_le64(GPT_HEADER_SIGNATURE_UBOOT);
584 gpt_h->revision = cpu_to_le32(GPT_HEADER_REVISION_V1);
585 gpt_h->header_size = cpu_to_le32(sizeof(gpt_header));
586 gpt_h->my_lba = cpu_to_le64(1);
587 gpt_h->alternate_lba = cpu_to_le64(desc->lba - 1);
588 gpt_h->last_usable_lba = cpu_to_le64(desc->lba - 34);
589 gpt_h->partition_entry_lba =
590 cpu_to_le64(partition_entries_offset(desc));
591 gpt_h->first_usable_lba =
592 cpu_to_le64(le64_to_cpu(gpt_h->partition_entry_lba) + 32);
593 gpt_h->num_partition_entries = cpu_to_le32(GPT_ENTRY_NUMBERS);
594 gpt_h->sizeof_partition_entry = cpu_to_le32(sizeof(gpt_entry));
595 gpt_h->header_crc32 = 0;
596 gpt_h->partition_entry_array_crc32 = 0;
598 if (uuid_str_to_bin(str_guid, gpt_h->disk_guid.b, UUID_STR_FORMAT_GUID))
604 int gpt_restore(struct blk_desc *desc, char *str_disk_guid,
605 struct disk_partition *partitions, int parts_count)
611 size = PAD_TO_BLOCKSIZE(sizeof(gpt_header), desc);
612 gpt_h = malloc_cache_aligned(size);
614 log_debug("calloc failed!\n");
617 memset(gpt_h, 0, size);
619 size = PAD_TO_BLOCKSIZE(GPT_ENTRY_NUMBERS * sizeof(gpt_entry),
621 gpt_e = malloc_cache_aligned(size);
623 log_debug("calloc failed!\n");
627 memset(gpt_e, 0, size);
629 /* Generate Primary GPT header (LBA1) */
630 ret = gpt_fill_header(desc, gpt_h, str_disk_guid, parts_count);
634 /* Generate partition entries */
635 ret = gpt_fill_pte(desc, gpt_h, gpt_e, partitions, parts_count);
639 /* Write GPT partition table */
640 ret = write_gpt_table(desc, gpt_h, gpt_e);
649 * gpt_convert_efi_name_to_char() - convert u16 string to char string
651 * TODO: this conversion only supports ANSI characters
654 * @es: u16 string to be converted
655 * @n: size of target buffer
657 static void gpt_convert_efi_name_to_char(char *s, void *es, int n)
664 for (i = 0, j = 0; j < n; i += 2, j++) {
671 int gpt_verify_headers(struct blk_desc *desc, gpt_header *gpt_head,
675 * This function validates AND
676 * fills in the GPT header and PTE
678 if (is_gpt_valid(desc,
679 GPT_PRIMARY_PARTITION_TABLE_LBA,
680 gpt_head, gpt_pte) != 1) {
681 log_debug("Invalid GPT\n");
685 /* Free pte before allocating again */
689 * Check that the alternate_lba entry points to the last LBA
691 if (le64_to_cpu(gpt_head->alternate_lba) != (desc->lba - 1)) {
692 log_debug("Misplaced Backup GPT\n");
696 if (is_gpt_valid(desc, (desc->lba - 1),
697 gpt_head, gpt_pte) != 1) {
698 log_debug("Invalid Backup GPT\n");
705 static void restore_primary_gpt_header(gpt_header *gpt_h, struct blk_desc *desc)
710 /* recalculate the values for the Primary GPT Header */
711 val = le64_to_cpu(gpt_h->my_lba);
712 gpt_h->my_lba = gpt_h->alternate_lba;
713 gpt_h->alternate_lba = cpu_to_le64(val);
714 gpt_h->partition_entry_lba = cpu_to_le64(partition_entries_offset(desc));
716 gpt_h->header_crc32 = 0;
718 calc_crc32 = efi_crc32((const unsigned char *)gpt_h,
719 le32_to_cpu(gpt_h->header_size));
720 gpt_h->header_crc32 = cpu_to_le32(calc_crc32);
723 static int write_one_gpt_table(struct blk_desc *desc, gpt_header *gpt_h,
726 const int pte_blk_cnt = BLOCK_CNT((gpt_h->num_partition_entries
727 * sizeof(gpt_entry)), desc);
731 start = le64_to_cpu(gpt_h->my_lba);
732 if (blk_dwrite(desc, start, 1, gpt_h) != 1) {
737 start = le64_to_cpu(gpt_h->partition_entry_lba);
738 if (blk_dwrite(desc, start, pte_blk_cnt, gpt_e) != pte_blk_cnt) {
747 int gpt_repair_headers(struct blk_desc *desc)
749 ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_h1, 1, desc->blksz);
750 ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_h2, 1, desc->blksz);
751 gpt_entry *gpt_e1 = NULL, *gpt_e2 = NULL;
752 int is_gpt1_valid, is_gpt2_valid;
755 is_gpt1_valid = is_gpt_valid(desc, GPT_PRIMARY_PARTITION_TABLE_LBA,
757 is_gpt2_valid = is_gpt_valid(desc, desc->lba - 1,
760 if (is_gpt1_valid && is_gpt2_valid) {
765 if (is_gpt1_valid && !is_gpt2_valid) {
766 prepare_backup_gpt_header(gpt_h1);
767 ret = write_one_gpt_table(desc, gpt_h1, gpt_e1);
771 if (!is_gpt1_valid && is_gpt2_valid) {
772 restore_primary_gpt_header(gpt_h2, desc);
773 ret = write_one_gpt_table(desc, gpt_h2, gpt_e2);
777 if (!is_gpt1_valid && !is_gpt2_valid) {
791 int gpt_verify_partitions(struct blk_desc *desc,
792 struct disk_partition *partitions, int parts,
793 gpt_header *gpt_head, gpt_entry **gpt_pte)
795 char efi_str[PARTNAME_SZ + 1];
800 ret = gpt_verify_headers(desc, gpt_head, gpt_pte);
806 for (i = 0; i < parts; i++) {
807 if (i == gpt_head->num_partition_entries) {
808 pr_err("More partitions than allowed!\n");
812 /* Check if GPT and ENV partition names match */
813 gpt_convert_efi_name_to_char(efi_str, gpt_e[i].partition_name,
816 debug("%s: part: %2d name - GPT: %16s, ENV: %16s ",
817 __func__, i, efi_str, partitions[i].name);
819 if (strncmp(efi_str, (char *)partitions[i].name,
820 sizeof(partitions->name))) {
821 pr_err("Partition name: %s does not match %s!\n",
822 efi_str, (char *)partitions[i].name);
826 /* Check if GPT and ENV sizes match */
827 gpt_part_size = le64_to_cpu(gpt_e[i].ending_lba) -
828 le64_to_cpu(gpt_e[i].starting_lba) + 1;
829 debug("size(LBA) - GPT: %8llu, ENV: %8llu ",
830 (unsigned long long)gpt_part_size,
831 (unsigned long long)partitions[i].size);
833 if (le64_to_cpu(gpt_part_size) != partitions[i].size) {
834 /* We do not check the extend partition size */
835 if ((i == parts - 1) && (partitions[i].size == 0))
838 pr_err("Partition %s size: %llu does not match %llu!\n",
839 efi_str, (unsigned long long)gpt_part_size,
840 (unsigned long long)partitions[i].size);
845 * Start address is optional - check only if provided
846 * in '$partition' variable
848 if (!partitions[i].start) {
853 /* Check if GPT and ENV start LBAs match */
854 debug("start LBA - GPT: %8llu, ENV: %8llu\n",
855 le64_to_cpu(gpt_e[i].starting_lba),
856 (unsigned long long)partitions[i].start);
858 if (le64_to_cpu(gpt_e[i].starting_lba) != partitions[i].start) {
859 pr_err("Partition %s start: %llu does not match %llu!\n",
860 efi_str, le64_to_cpu(gpt_e[i].starting_lba),
861 (unsigned long long)partitions[i].start);
869 int is_valid_gpt_buf(struct blk_desc *desc, void *buf)
874 /* determine start of GPT Header in the buffer */
875 gpt_h = buf + (GPT_PRIMARY_PARTITION_TABLE_LBA * desc->blksz);
876 if (validate_gpt_header(gpt_h, GPT_PRIMARY_PARTITION_TABLE_LBA,
880 /* determine start of GPT Entries in the buffer */
881 gpt_e = buf + (le64_to_cpu(gpt_h->partition_entry_lba) *
883 if (validate_gpt_entries(gpt_h, gpt_e))
889 int write_mbr_and_gpt_partitions(struct blk_desc *desc, void *buf)
897 if (is_valid_gpt_buf(desc, buf))
900 /* determine start of GPT Header in the buffer */
901 gpt_h = buf + (GPT_PRIMARY_PARTITION_TABLE_LBA * desc->blksz);
903 /* determine start of GPT Entries in the buffer */
904 gpt_e = buf + (le64_to_cpu(gpt_h->partition_entry_lba) * desc->blksz);
905 gpt_e_blk_cnt = BLOCK_CNT((le32_to_cpu(gpt_h->num_partition_entries) *
906 le32_to_cpu(gpt_h->sizeof_partition_entry)),
910 lba = 0; /* MBR is always at 0 */
911 cnt = 1; /* MBR (1 block) */
912 if (blk_dwrite(desc, lba, cnt, buf) != cnt) {
913 log_debug("failed writing '%s' (%d blks at 0x" LBAF ")\n",
918 /* write Primary GPT */
919 lba = GPT_PRIMARY_PARTITION_TABLE_LBA;
920 cnt = 1; /* GPT Header (1 block) */
921 if (blk_dwrite(desc, lba, cnt, gpt_h) != cnt) {
922 log_debug("failed writing '%s' (%d blks at 0x" LBAF ")\n",
923 "Primary GPT Header", cnt, lba);
927 lba = le64_to_cpu(gpt_h->partition_entry_lba);
929 if (blk_dwrite(desc, lba, cnt, gpt_e) != cnt) {
930 log_debug("failed writing '%s' (%d blks at 0x" LBAF ")\n",
931 "Primary GPT Entries", cnt, lba);
935 prepare_backup_gpt_header(gpt_h);
937 /* write Backup GPT */
938 lba = le64_to_cpu(gpt_h->partition_entry_lba);
940 if (blk_dwrite(desc, lba, cnt, gpt_e) != cnt) {
941 log_debug("failed writing '%s' (%d blks at 0x" LBAF ")\n",
942 "Backup GPT Entries", cnt, lba);
946 lba = le64_to_cpu(gpt_h->my_lba);
947 cnt = 1; /* GPT Header (1 block) */
948 if (blk_dwrite(desc, lba, cnt, gpt_h) != cnt) {
949 log_debug("failed writing '%s' (%d blks at 0x" LBAF ")\n",
950 "Backup GPT Header", cnt, lba);
954 /* Update the partition table entries*/
965 * pmbr_part_valid(): Check for EFI partition signature
967 * Returns: 1 if EFI GPT partition type is found.
969 static int pmbr_part_valid(struct partition *part)
971 if (part->sys_ind == EFI_PMBR_OSTYPE_EFI_GPT &&
972 get_unaligned_le32(&part->start_sect) == 1UL) {
980 * is_pmbr_valid(): test Protective MBR for validity
982 * @mbr: Pointer to Master Boot-Record data
984 * Returns: 1 if PMBR is valid, 0 otherwise.
985 * Validity depends on two things:
986 * 1) MSDOS signature is in the last two bytes of the MBR
987 * 2) One partition of type 0xEE is found, checked by pmbr_part_valid()
989 static int is_pmbr_valid(legacy_mbr *mbr)
991 uint sig = le16_to_cpu(mbr->signature);
994 if (sig != MSDOS_MBR_SIGNATURE) {
995 log_debug("Invalid signature %x\n", sig);
998 log_debug("Signature %x valid\n", sig);
1000 for (i = 0; i < 4; i++) {
1001 if (pmbr_part_valid(&mbr->partition_record[i])) {
1009 * is_gpt_valid() - tests one GPT header and PTEs for validity
1011 * lba is the logical block address of the GPT header to test
1012 * gpt is a GPT header ptr, filled on return.
1013 * ptes is a PTEs ptr, filled on return.
1015 * Description: returns 1 if valid, 0 on error, 2 if ignored header
1016 * If valid, returns pointers to PTEs.
1018 static int is_gpt_valid(struct blk_desc *desc, u64 lba, gpt_header *pgpt_head,
1019 gpt_entry **pgpt_pte)
1021 /* Confirm valid arguments prior to allocation. */
1022 if (!desc || !pgpt_head) {
1023 log_debug("Invalid Argument(s)\n");
1027 ALLOC_CACHE_ALIGN_BUFFER_PAD(legacy_mbr, mbr, 1, desc->blksz);
1029 /* Read MBR Header from device */
1030 if (blk_dread(desc, 0, 1, (ulong *)mbr) != 1) {
1031 log_debug("Can't read MBR header\n");
1035 /* Read GPT Header from device */
1036 if (blk_dread(desc, (lbaint_t)lba, 1, pgpt_head) != 1) {
1037 log_debug("Can't read GPT header\n");
1041 /* Invalid but nothing to yell about. */
1042 if (le64_to_cpu(pgpt_head->signature) == GPT_HEADER_CHROMEOS_IGNORE) {
1043 log_debug("ChromeOS 'IGNOREME' GPT header found and ignored\n");
1047 if (validate_gpt_header(pgpt_head, (lbaint_t)lba, desc->lba))
1050 if (desc->sig_type == SIG_TYPE_NONE) {
1051 efi_guid_t empty = {};
1052 if (memcmp(&pgpt_head->disk_guid, &empty, sizeof(empty))) {
1053 desc->sig_type = SIG_TYPE_GUID;
1054 memcpy(&desc->guid_sig, &pgpt_head->disk_guid,
1056 } else if (mbr->unique_mbr_signature != 0) {
1057 desc->sig_type = SIG_TYPE_MBR;
1058 desc->mbr_sig = mbr->unique_mbr_signature;
1062 /* Read and allocate Partition Table Entries */
1063 *pgpt_pte = alloc_read_gpt_entries(desc, pgpt_head);
1067 if (validate_gpt_entries(pgpt_head, *pgpt_pte)) {
1072 /* We're done, all's well */
1077 * find_valid_gpt() - finds a valid GPT header and PTEs
1079 * gpt is a GPT header ptr, filled on return.
1080 * ptes is a PTEs ptr, filled on return.
1082 * Description: returns 1 if found a valid gpt, 0 on error.
1083 * If valid, returns pointers to PTEs.
1085 static int find_valid_gpt(struct blk_desc *desc, gpt_header *gpt_head,
1086 gpt_entry **pgpt_pte)
1090 r = is_gpt_valid(desc, GPT_PRIMARY_PARTITION_TABLE_LBA, gpt_head,
1095 log_debug("Invalid GPT\n");
1097 if (is_gpt_valid(desc, desc->lba - 1, gpt_head, pgpt_pte)
1099 log_debug("Invalid Backup GPT\n");
1103 log_debug(" Using Backup GPT\n");
1109 * alloc_read_gpt_entries(): reads partition entries from disk
1113 * Description: Returns ptes on success, NULL on error.
1114 * Allocates space for PTEs based on information found in @gpt.
1115 * Notes: remember to free pte when you're done!
1117 static gpt_entry *alloc_read_gpt_entries(struct blk_desc *desc,
1118 gpt_header *pgpt_head)
1120 size_t count = 0, blk_cnt;
1122 gpt_entry *pte = NULL;
1124 if (!desc || !pgpt_head) {
1125 log_debug("Invalid Argument(s)\n");
1129 count = le32_to_cpu(pgpt_head->num_partition_entries) *
1130 le32_to_cpu(pgpt_head->sizeof_partition_entry);
1132 log_debug("count = %u * %u = %lu\n",
1133 (u32)le32_to_cpu(pgpt_head->num_partition_entries),
1134 (u32)le32_to_cpu(pgpt_head->sizeof_partition_entry),
1137 /* Allocate memory for PTE, remember to FREE */
1139 pte = memalign(ARCH_DMA_MINALIGN,
1140 PAD_TO_BLOCKSIZE(count, desc));
1143 if (count == 0 || pte == NULL) {
1144 log_debug("ERROR: Can't allocate %#lX bytes for GPT Entries\n",
1149 /* Read GPT Entries from device */
1150 blk = le64_to_cpu(pgpt_head->partition_entry_lba);
1151 blk_cnt = BLOCK_CNT(count, desc);
1152 if (blk_dread(desc, blk, (lbaint_t)blk_cnt, pte) != blk_cnt) {
1153 log_debug("Can't read GPT Entries\n");
1161 * is_pte_valid(): validates a single Partition Table Entry
1162 * @gpt_entry - Pointer to a single Partition Table Entry
1164 * Description: returns 1 if valid, 0 on error.
1166 static int is_pte_valid(gpt_entry * pte)
1168 efi_guid_t unused_guid;
1171 log_debug("Invalid Argument(s)\n");
1175 /* Only one validation for now:
1176 * The GUID Partition Type != Unused Entry (ALL-ZERO)
1178 memset(unused_guid.b, 0, sizeof(unused_guid.b));
1180 if (memcmp(pte->partition_type_guid.b, unused_guid.b,
1181 sizeof(unused_guid.b)) == 0) {
1183 log_debug("Found an unused PTE GUID at 0x%08X\n",
1184 (unsigned int)(uintptr_t)pte);
1193 * Add an 'a_' prefix so it comes before 'dos' in the linker list. We need to
1194 * check EFI first, since a DOS partition is often used as a 'protective MBR'
1197 U_BOOT_PART_TYPE(a_efi) = {
1199 .part_type = PART_TYPE_EFI,
1200 .max_entries = GPT_ENTRY_NUMBERS,
1201 .get_info = part_get_info_ptr(part_get_info_efi),
1202 .print = part_print_ptr(part_print_efi),
1203 .test = part_test_efi,