1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (C) 2008 RuggedCom, Inc.
4 * Richard Retanubun <RichardRetanubun@RuggedCom.com>
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 Terra Bytes
13 #include <asm/unaligned.h>
21 #include <linux/compiler.h>
22 #include <linux/ctype.h>
23 #include <u-boot/crc.h>
25 DECLARE_GLOBAL_DATA_PTR;
28 * GUID for basic data partions.
30 static const efi_guid_t partition_basic_data_guid = PARTITION_BASIC_DATA_GUID;
32 #ifdef CONFIG_HAVE_BLOCK_DEVICE
34 * efi_crc32() - EFI version of crc32 function
35 * @buf: buffer to calculate crc32 of
36 * @len - length of buf
38 * Description: Returns EFI-style CRC32 value for @buf
40 static inline u32 efi_crc32(const void *buf, u32 len)
42 return crc32(0, buf, len);
46 * Private function prototypes
49 static int pmbr_part_valid(struct partition *part);
50 static int is_pmbr_valid(legacy_mbr * mbr);
51 static int is_gpt_valid(struct blk_desc *dev_desc, u64 lba,
52 gpt_header *pgpt_head, gpt_entry **pgpt_pte);
53 static gpt_entry *alloc_read_gpt_entries(struct blk_desc *dev_desc,
54 gpt_header *pgpt_head);
55 static int is_pte_valid(gpt_entry * pte);
56 static int find_valid_gpt(struct blk_desc *dev_desc, gpt_header *gpt_head,
57 gpt_entry **pgpt_pte);
59 static char *print_efiname(gpt_entry *pte)
61 static char name[PARTNAME_SZ + 1];
63 for (i = 0; i < PARTNAME_SZ; i++) {
65 c = pte->partition_name[i] & 0xff;
66 c = (c && !isprint(c)) ? '.' : c;
69 name[PARTNAME_SZ] = 0;
73 static const efi_guid_t system_guid = PARTITION_SYSTEM_GUID;
75 static int get_bootable(gpt_entry *p)
79 if (!memcmp(&p->partition_type_guid, &system_guid, sizeof(efi_guid_t)))
80 ret |= PART_EFI_SYSTEM_PARTITION;
81 if (p->attributes.fields.legacy_bios_bootable)
86 static int validate_gpt_header(gpt_header *gpt_h, lbaint_t lba,
89 uint32_t crc32_backup = 0;
92 /* Check the GPT header signature */
93 if (le64_to_cpu(gpt_h->signature) != GPT_HEADER_SIGNATURE_UBOOT) {
94 printf("%s signature is wrong: 0x%llX != 0x%llX\n",
95 "GUID Partition Table Header",
96 le64_to_cpu(gpt_h->signature),
97 GPT_HEADER_SIGNATURE_UBOOT);
101 /* Check the GUID Partition Table CRC */
102 memcpy(&crc32_backup, &gpt_h->header_crc32, sizeof(crc32_backup));
103 memset(&gpt_h->header_crc32, 0, sizeof(gpt_h->header_crc32));
105 calc_crc32 = efi_crc32((const unsigned char *)gpt_h,
106 le32_to_cpu(gpt_h->header_size));
108 memcpy(&gpt_h->header_crc32, &crc32_backup, sizeof(crc32_backup));
110 if (calc_crc32 != le32_to_cpu(crc32_backup)) {
111 printf("%s CRC is wrong: 0x%x != 0x%x\n",
112 "GUID Partition Table Header",
113 le32_to_cpu(crc32_backup), calc_crc32);
118 * Check that the my_lba entry points to the LBA that contains the GPT
120 if (le64_to_cpu(gpt_h->my_lba) != lba) {
121 printf("GPT: my_lba incorrect: %llX != " LBAF "\n",
122 le64_to_cpu(gpt_h->my_lba),
128 * Check that the first_usable_lba and that the last_usable_lba are
131 if (le64_to_cpu(gpt_h->first_usable_lba) > lastlba) {
132 printf("GPT: first_usable_lba incorrect: %llX > " LBAF "\n",
133 le64_to_cpu(gpt_h->first_usable_lba), lastlba);
136 if (le64_to_cpu(gpt_h->last_usable_lba) > lastlba) {
137 printf("GPT: last_usable_lba incorrect: %llX > " LBAF "\n",
138 le64_to_cpu(gpt_h->last_usable_lba), lastlba);
142 debug("GPT: first_usable_lba: %llX last_usable_lba: %llX last lba: "
143 LBAF "\n", le64_to_cpu(gpt_h->first_usable_lba),
144 le64_to_cpu(gpt_h->last_usable_lba), lastlba);
149 static int validate_gpt_entries(gpt_header *gpt_h, gpt_entry *gpt_e)
153 /* Check the GUID Partition Table Entry Array CRC */
154 calc_crc32 = efi_crc32((const unsigned char *)gpt_e,
155 le32_to_cpu(gpt_h->num_partition_entries) *
156 le32_to_cpu(gpt_h->sizeof_partition_entry));
158 if (calc_crc32 != le32_to_cpu(gpt_h->partition_entry_array_crc32)) {
159 printf("%s: 0x%x != 0x%x\n",
160 "GUID Partition Table Entry Array CRC is wrong",
161 le32_to_cpu(gpt_h->partition_entry_array_crc32),
169 static void prepare_backup_gpt_header(gpt_header *gpt_h)
174 /* recalculate the values for the Backup GPT Header */
175 val = le64_to_cpu(gpt_h->my_lba);
176 gpt_h->my_lba = gpt_h->alternate_lba;
177 gpt_h->alternate_lba = cpu_to_le64(val);
178 gpt_h->partition_entry_lba =
179 cpu_to_le64(le64_to_cpu(gpt_h->last_usable_lba) + 1);
180 gpt_h->header_crc32 = 0;
182 calc_crc32 = efi_crc32((const unsigned char *)gpt_h,
183 le32_to_cpu(gpt_h->header_size));
184 gpt_h->header_crc32 = cpu_to_le32(calc_crc32);
187 #if CONFIG_IS_ENABLED(EFI_PARTITION)
189 * Public Functions (include/part.h)
193 * UUID is displayed as 32 hexadecimal digits, in 5 groups,
194 * separated by hyphens, in the form 8-4-4-4-12 for a total of 36 characters
196 int get_disk_guid(struct blk_desc * dev_desc, char *guid)
198 ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_head, 1, dev_desc->blksz);
199 gpt_entry *gpt_pte = NULL;
200 unsigned char *guid_bin;
202 /* This function validates AND fills in the GPT header and PTE */
203 if (find_valid_gpt(dev_desc, gpt_head, &gpt_pte) != 1)
206 guid_bin = gpt_head->disk_guid.b;
207 uuid_bin_to_str(guid_bin, guid, UUID_STR_FORMAT_GUID);
209 /* Remember to free pte */
214 void part_print_efi(struct blk_desc *dev_desc)
216 ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_head, 1, dev_desc->blksz);
217 gpt_entry *gpt_pte = NULL;
219 char uuid[UUID_STR_LEN + 1];
220 unsigned char *uuid_bin;
222 /* This function validates AND fills in the GPT header and PTE */
223 if (find_valid_gpt(dev_desc, gpt_head, &gpt_pte) != 1)
226 debug("%s: gpt-entry at %p\n", __func__, gpt_pte);
228 printf("Part\tStart LBA\tEnd LBA\t\tName\n");
229 printf("\tAttributes\n");
230 printf("\tType GUID\n");
231 printf("\tPartition GUID\n");
233 for (i = 0; i < le32_to_cpu(gpt_head->num_partition_entries); i++) {
234 /* Stop at the first non valid PTE */
235 if (!is_pte_valid(&gpt_pte[i]))
238 printf("%3d\t0x%08llx\t0x%08llx\t\"%s\"\n", (i + 1),
239 le64_to_cpu(gpt_pte[i].starting_lba),
240 le64_to_cpu(gpt_pte[i].ending_lba),
241 print_efiname(&gpt_pte[i]));
242 printf("\tattrs:\t0x%016llx\n", gpt_pte[i].attributes.raw);
243 uuid_bin = (unsigned char *)gpt_pte[i].partition_type_guid.b;
244 uuid_bin_to_str(uuid_bin, uuid, UUID_STR_FORMAT_GUID);
245 printf("\ttype:\t%s\n", uuid);
246 #ifdef CONFIG_PARTITION_TYPE_GUID
247 if (!uuid_guid_get_str(uuid_bin, uuid))
248 printf("\ttype:\t%s\n", uuid);
250 uuid_bin = (unsigned char *)gpt_pte[i].unique_partition_guid.b;
251 uuid_bin_to_str(uuid_bin, uuid, UUID_STR_FORMAT_GUID);
252 printf("\tguid:\t%s\n", uuid);
255 /* Remember to free pte */
260 int part_get_info_efi(struct blk_desc *dev_desc, int part,
261 disk_partition_t *info)
263 ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_head, 1, dev_desc->blksz);
264 gpt_entry *gpt_pte = NULL;
266 /* "part" argument must be at least 1 */
268 printf("%s: Invalid Argument(s)\n", __func__);
272 /* This function validates AND fills in the GPT header and PTE */
273 if (find_valid_gpt(dev_desc, gpt_head, &gpt_pte) != 1)
276 if (part > le32_to_cpu(gpt_head->num_partition_entries) ||
277 !is_pte_valid(&gpt_pte[part - 1])) {
278 debug("%s: *** ERROR: Invalid partition number %d ***\n",
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 = dev_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, info->uuid,
297 UUID_STR_FORMAT_GUID);
299 #ifdef CONFIG_PARTITION_TYPE_GUID
300 uuid_bin_to_str(gpt_pte[part - 1].partition_type_guid.b,
301 info->type_guid, UUID_STR_FORMAT_GUID);
304 debug("%s: start 0x" LBAF ", size 0x" LBAF ", name %s\n", __func__,
305 info->start, info->size, info->name);
307 /* Remember to free pte */
312 static int part_test_efi(struct blk_desc *dev_desc)
314 ALLOC_CACHE_ALIGN_BUFFER_PAD(legacy_mbr, legacymbr, 1, dev_desc->blksz);
316 /* Read legacy MBR from block 0 and validate it */
317 if ((blk_dread(dev_desc, 0, 1, (ulong *)legacymbr) != 1)
318 || (is_pmbr_valid(legacymbr) != 1)) {
325 * set_protective_mbr(): Set the EFI protective MBR
326 * @param dev_desc - block device descriptor
328 * @return - zero on success, otherwise error
330 static int set_protective_mbr(struct blk_desc *dev_desc)
332 /* Setup the Protective MBR */
333 ALLOC_CACHE_ALIGN_BUFFER_PAD(legacy_mbr, p_mbr, 1, dev_desc->blksz);
335 printf("%s: calloc failed!\n", __func__);
339 /* Read MBR to backup boot code if it exists */
340 if (blk_dread(dev_desc, 0, 1, p_mbr) != 1) {
341 pr_err("** Can't read from device %d **\n", dev_desc->devnum);
345 /* Clear all data in MBR except of backed up boot code */
346 memset((char *)p_mbr + MSDOS_MBR_BOOT_CODE_SIZE, 0, sizeof(*p_mbr) -
347 MSDOS_MBR_BOOT_CODE_SIZE);
349 /* Append signature */
350 p_mbr->signature = MSDOS_MBR_SIGNATURE;
351 p_mbr->partition_record[0].sys_ind = EFI_PMBR_OSTYPE_EFI_GPT;
352 p_mbr->partition_record[0].start_sect = 1;
353 p_mbr->partition_record[0].nr_sects = (u32) dev_desc->lba - 1;
355 /* Write MBR sector to the MMC device */
356 if (blk_dwrite(dev_desc, 0, 1, p_mbr) != 1) {
357 printf("** Can't write to device %d **\n",
365 int write_gpt_table(struct blk_desc *dev_desc,
366 gpt_header *gpt_h, gpt_entry *gpt_e)
368 const int pte_blk_cnt = BLOCK_CNT((gpt_h->num_partition_entries
369 * sizeof(gpt_entry)), dev_desc);
372 debug("max lba: %x\n", (u32) dev_desc->lba);
373 /* Setup the Protective MBR */
374 if (set_protective_mbr(dev_desc) < 0)
377 /* Generate CRC for the Primary GPT Header */
378 calc_crc32 = efi_crc32((const unsigned char *)gpt_e,
379 le32_to_cpu(gpt_h->num_partition_entries) *
380 le32_to_cpu(gpt_h->sizeof_partition_entry));
381 gpt_h->partition_entry_array_crc32 = cpu_to_le32(calc_crc32);
383 calc_crc32 = efi_crc32((const unsigned char *)gpt_h,
384 le32_to_cpu(gpt_h->header_size));
385 gpt_h->header_crc32 = cpu_to_le32(calc_crc32);
387 /* Write the First GPT to the block right after the Legacy MBR */
388 if (blk_dwrite(dev_desc, 1, 1, gpt_h) != 1)
391 if (blk_dwrite(dev_desc, le64_to_cpu(gpt_h->partition_entry_lba),
392 pte_blk_cnt, gpt_e) != pte_blk_cnt)
395 prepare_backup_gpt_header(gpt_h);
397 if (blk_dwrite(dev_desc, (lbaint_t)le64_to_cpu(gpt_h->last_usable_lba)
398 + 1, pte_blk_cnt, gpt_e) != pte_blk_cnt)
401 if (blk_dwrite(dev_desc, (lbaint_t)le64_to_cpu(gpt_h->my_lba), 1,
405 debug("GPT successfully written to block device!\n");
409 printf("** Can't write to device %d **\n", dev_desc->devnum);
413 int gpt_fill_pte(struct blk_desc *dev_desc,
414 gpt_header *gpt_h, gpt_entry *gpt_e,
415 disk_partition_t *partitions, int parts)
417 lbaint_t offset = (lbaint_t)le64_to_cpu(gpt_h->first_usable_lba);
418 lbaint_t last_usable_lba = (lbaint_t)
419 le64_to_cpu(gpt_h->last_usable_lba);
421 size_t efiname_len, dosname_len;
422 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
424 unsigned char *bin_uuid;
426 #ifdef CONFIG_PARTITION_TYPE_GUID
428 unsigned char *bin_type_guid;
430 size_t hdr_start = gpt_h->my_lba;
431 size_t hdr_end = hdr_start + 1;
433 size_t pte_start = gpt_h->partition_entry_lba;
434 size_t pte_end = pte_start +
435 gpt_h->num_partition_entries * gpt_h->sizeof_partition_entry /
438 for (i = 0; i < parts; i++) {
439 /* partition starting lba */
440 lbaint_t start = partitions[i].start;
441 lbaint_t size = partitions[i].size;
444 offset = start + size;
451 * If our partition overlaps with either the GPT
452 * header, or the partition entry, reject it.
454 if (((start < hdr_end && hdr_start < (start + size)) ||
455 (start < pte_end && pte_start < (start + size)))) {
456 printf("Partition overlap\n");
460 gpt_e[i].starting_lba = cpu_to_le64(start);
462 if (offset > (last_usable_lba + 1)) {
463 printf("Partitions layout exceds disk size\n");
466 /* partition ending lba */
467 if ((i == parts - 1) && (size == 0))
468 /* extend the last partition to maximuim */
469 gpt_e[i].ending_lba = gpt_h->last_usable_lba;
471 gpt_e[i].ending_lba = cpu_to_le64(offset - 1);
473 #ifdef CONFIG_PARTITION_TYPE_GUID
474 str_type_guid = partitions[i].type_guid;
475 bin_type_guid = gpt_e[i].partition_type_guid.b;
476 if (strlen(str_type_guid)) {
477 if (uuid_str_to_bin(str_type_guid, bin_type_guid,
478 UUID_STR_FORMAT_GUID)) {
479 printf("Partition no. %d: invalid type guid: %s\n",
484 /* default partition type GUID */
485 memcpy(bin_type_guid,
486 &partition_basic_data_guid, 16);
489 /* partition type GUID */
490 memcpy(gpt_e[i].partition_type_guid.b,
491 &partition_basic_data_guid, 16);
494 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
495 str_uuid = partitions[i].uuid;
496 bin_uuid = gpt_e[i].unique_partition_guid.b;
498 if (uuid_str_to_bin(str_uuid, bin_uuid, UUID_STR_FORMAT_GUID)) {
499 printf("Partition no. %d: invalid guid: %s\n",
505 /* partition attributes */
506 memset(&gpt_e[i].attributes, 0,
507 sizeof(gpt_entry_attributes));
509 if (partitions[i].bootable & PART_BOOTABLE)
510 gpt_e[i].attributes.fields.legacy_bios_bootable = 1;
513 efiname_len = sizeof(gpt_e[i].partition_name)
514 / sizeof(efi_char16_t);
515 dosname_len = sizeof(partitions[i].name);
517 memset(gpt_e[i].partition_name, 0,
518 sizeof(gpt_e[i].partition_name));
520 for (k = 0; k < min(dosname_len, efiname_len); k++)
521 gpt_e[i].partition_name[k] =
522 (efi_char16_t)(partitions[i].name[k]);
524 debug("%s: name: %s offset[%d]: 0x" LBAF
525 " size[%d]: 0x" LBAF "\n",
526 __func__, partitions[i].name, i,
533 static uint32_t partition_entries_offset(struct blk_desc *dev_desc)
535 uint32_t offset_blks = 2;
536 uint32_t __maybe_unused offset_bytes;
537 int __maybe_unused config_offset;
539 #if defined(CONFIG_EFI_PARTITION_ENTRIES_OFF)
541 * Some architectures require their SPL loader at a fixed
542 * address within the first 16KB of the disk. To avoid an
543 * overlap with the partition entries of the EFI partition
544 * table, the first safe offset (in bytes, from the start of
545 * the disk) for the entries can be set in
546 * CONFIG_EFI_PARTITION_ENTRIES_OFF.
549 PAD_TO_BLOCKSIZE(CONFIG_EFI_PARTITION_ENTRIES_OFF, dev_desc);
550 offset_blks = offset_bytes / dev_desc->blksz;
553 #if defined(CONFIG_OF_CONTROL)
555 * Allow the offset of the first partition entires (in bytes
556 * from the start of the device) to be specified as a property
557 * of the device tree '/config' node.
559 config_offset = fdtdec_get_config_int(gd->fdt_blob,
560 "u-boot,efi-partition-entries-offset",
562 if (config_offset != -EINVAL) {
563 offset_bytes = PAD_TO_BLOCKSIZE(config_offset, dev_desc);
564 offset_blks = offset_bytes / dev_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 *dev_desc, gpt_header *gpt_h,
581 char *str_guid, int parts_count)
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(dev_desc->lba - 1);
588 gpt_h->last_usable_lba = cpu_to_le64(dev_desc->lba - 34);
589 gpt_h->partition_entry_lba =
590 cpu_to_le64(partition_entries_offset(dev_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 *dev_desc, char *str_disk_guid,
605 disk_partition_t *partitions, int parts_count)
611 size = PAD_TO_BLOCKSIZE(sizeof(gpt_header), dev_desc);
612 gpt_h = malloc_cache_aligned(size);
614 printf("%s: calloc failed!\n", __func__);
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 printf("%s: calloc failed!\n", __func__);
627 memset(gpt_e, 0, size);
629 /* Generate Primary GPT header (LBA1) */
630 ret = gpt_fill_header(dev_desc, gpt_h, str_disk_guid, parts_count);
634 /* Generate partition entries */
635 ret = gpt_fill_pte(dev_desc, gpt_h, gpt_e, partitions, parts_count);
639 /* Write GPT partition table */
640 ret = write_gpt_table(dev_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 *dev_desc, gpt_header *gpt_head,
675 * This function validates AND
676 * fills in the GPT header and PTE
678 if (is_gpt_valid(dev_desc,
679 GPT_PRIMARY_PARTITION_TABLE_LBA,
680 gpt_head, gpt_pte) != 1) {
681 printf("%s: *** ERROR: Invalid GPT ***\n",
686 /* Free pte before allocating again */
689 if (is_gpt_valid(dev_desc, (dev_desc->lba - 1),
690 gpt_head, gpt_pte) != 1) {
691 printf("%s: *** ERROR: Invalid Backup GPT ***\n",
699 int gpt_verify_partitions(struct blk_desc *dev_desc,
700 disk_partition_t *partitions, int parts,
701 gpt_header *gpt_head, gpt_entry **gpt_pte)
703 char efi_str[PARTNAME_SZ + 1];
708 ret = gpt_verify_headers(dev_desc, gpt_head, gpt_pte);
714 for (i = 0; i < parts; i++) {
715 if (i == gpt_head->num_partition_entries) {
716 pr_err("More partitions than allowed!\n");
720 /* Check if GPT and ENV partition names match */
721 gpt_convert_efi_name_to_char(efi_str, gpt_e[i].partition_name,
724 debug("%s: part: %2d name - GPT: %16s, ENV: %16s ",
725 __func__, i, efi_str, partitions[i].name);
727 if (strncmp(efi_str, (char *)partitions[i].name,
728 sizeof(partitions->name))) {
729 pr_err("Partition name: %s does not match %s!\n",
730 efi_str, (char *)partitions[i].name);
734 /* Check if GPT and ENV sizes match */
735 gpt_part_size = le64_to_cpu(gpt_e[i].ending_lba) -
736 le64_to_cpu(gpt_e[i].starting_lba) + 1;
737 debug("size(LBA) - GPT: %8llu, ENV: %8llu ",
738 (unsigned long long)gpt_part_size,
739 (unsigned long long)partitions[i].size);
741 if (le64_to_cpu(gpt_part_size) != partitions[i].size) {
742 /* We do not check the extend partition size */
743 if ((i == parts - 1) && (partitions[i].size == 0))
746 pr_err("Partition %s size: %llu does not match %llu!\n",
747 efi_str, (unsigned long long)gpt_part_size,
748 (unsigned long long)partitions[i].size);
753 * Start address is optional - check only if provided
754 * in '$partition' variable
756 if (!partitions[i].start) {
761 /* Check if GPT and ENV start LBAs match */
762 debug("start LBA - GPT: %8llu, ENV: %8llu\n",
763 le64_to_cpu(gpt_e[i].starting_lba),
764 (unsigned long long)partitions[i].start);
766 if (le64_to_cpu(gpt_e[i].starting_lba) != partitions[i].start) {
767 pr_err("Partition %s start: %llu does not match %llu!\n",
768 efi_str, le64_to_cpu(gpt_e[i].starting_lba),
769 (unsigned long long)partitions[i].start);
777 int is_valid_gpt_buf(struct blk_desc *dev_desc, void *buf)
782 /* determine start of GPT Header in the buffer */
783 gpt_h = buf + (GPT_PRIMARY_PARTITION_TABLE_LBA *
785 if (validate_gpt_header(gpt_h, GPT_PRIMARY_PARTITION_TABLE_LBA,
789 /* determine start of GPT Entries in the buffer */
790 gpt_e = buf + (le64_to_cpu(gpt_h->partition_entry_lba) *
792 if (validate_gpt_entries(gpt_h, gpt_e))
798 int write_mbr_and_gpt_partitions(struct blk_desc *dev_desc, void *buf)
806 if (is_valid_gpt_buf(dev_desc, buf))
809 /* determine start of GPT Header in the buffer */
810 gpt_h = buf + (GPT_PRIMARY_PARTITION_TABLE_LBA *
813 /* determine start of GPT Entries in the buffer */
814 gpt_e = buf + (le64_to_cpu(gpt_h->partition_entry_lba) *
816 gpt_e_blk_cnt = BLOCK_CNT((le32_to_cpu(gpt_h->num_partition_entries) *
817 le32_to_cpu(gpt_h->sizeof_partition_entry)),
821 lba = 0; /* MBR is always at 0 */
822 cnt = 1; /* MBR (1 block) */
823 if (blk_dwrite(dev_desc, lba, cnt, buf) != cnt) {
824 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n",
825 __func__, "MBR", cnt, lba);
829 /* write Primary GPT */
830 lba = GPT_PRIMARY_PARTITION_TABLE_LBA;
831 cnt = 1; /* GPT Header (1 block) */
832 if (blk_dwrite(dev_desc, lba, cnt, gpt_h) != cnt) {
833 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n",
834 __func__, "Primary GPT Header", cnt, lba);
838 lba = le64_to_cpu(gpt_h->partition_entry_lba);
840 if (blk_dwrite(dev_desc, lba, cnt, gpt_e) != cnt) {
841 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n",
842 __func__, "Primary GPT Entries", cnt, lba);
846 prepare_backup_gpt_header(gpt_h);
848 /* write Backup GPT */
849 lba = le64_to_cpu(gpt_h->partition_entry_lba);
851 if (blk_dwrite(dev_desc, lba, cnt, gpt_e) != cnt) {
852 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n",
853 __func__, "Backup GPT Entries", cnt, lba);
857 lba = le64_to_cpu(gpt_h->my_lba);
858 cnt = 1; /* GPT Header (1 block) */
859 if (blk_dwrite(dev_desc, lba, cnt, gpt_h) != cnt) {
860 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n",
861 __func__, "Backup GPT Header", cnt, lba);
873 * pmbr_part_valid(): Check for EFI partition signature
875 * Returns: 1 if EFI GPT partition type is found.
877 static int pmbr_part_valid(struct partition *part)
879 if (part->sys_ind == EFI_PMBR_OSTYPE_EFI_GPT &&
880 get_unaligned_le32(&part->start_sect) == 1UL) {
888 * is_pmbr_valid(): test Protective MBR for validity
890 * Returns: 1 if PMBR is valid, 0 otherwise.
891 * Validity depends on two things:
892 * 1) MSDOS signature is in the last two bytes of the MBR
893 * 2) One partition of type 0xEE is found, checked by pmbr_part_valid()
895 static int is_pmbr_valid(legacy_mbr * mbr)
899 if (!mbr || le16_to_cpu(mbr->signature) != MSDOS_MBR_SIGNATURE)
902 for (i = 0; i < 4; i++) {
903 if (pmbr_part_valid(&mbr->partition_record[i])) {
911 * is_gpt_valid() - tests one GPT header and PTEs for validity
913 * lba is the logical block address of the GPT header to test
914 * gpt is a GPT header ptr, filled on return.
915 * ptes is a PTEs ptr, filled on return.
917 * Description: returns 1 if valid, 0 on error, 2 if ignored header
918 * If valid, returns pointers to PTEs.
920 static int is_gpt_valid(struct blk_desc *dev_desc, u64 lba,
921 gpt_header *pgpt_head, gpt_entry **pgpt_pte)
923 /* Confirm valid arguments prior to allocation. */
924 if (!dev_desc || !pgpt_head) {
925 printf("%s: Invalid Argument(s)\n", __func__);
929 ALLOC_CACHE_ALIGN_BUFFER_PAD(legacy_mbr, mbr, 1, dev_desc->blksz);
931 /* Read MBR Header from device */
932 if (blk_dread(dev_desc, 0, 1, (ulong *)mbr) != 1) {
933 printf("*** ERROR: Can't read MBR header ***\n");
937 /* Read GPT Header from device */
938 if (blk_dread(dev_desc, (lbaint_t)lba, 1, pgpt_head) != 1) {
939 printf("*** ERROR: Can't read GPT header ***\n");
943 /* Invalid but nothing to yell about. */
944 if (le64_to_cpu(pgpt_head->signature) == GPT_HEADER_CHROMEOS_IGNORE) {
945 debug("ChromeOS 'IGNOREME' GPT header found and ignored\n");
949 if (validate_gpt_header(pgpt_head, (lbaint_t)lba, dev_desc->lba))
952 if (dev_desc->sig_type == SIG_TYPE_NONE) {
953 efi_guid_t empty = {};
954 if (memcmp(&pgpt_head->disk_guid, &empty, sizeof(empty))) {
955 dev_desc->sig_type = SIG_TYPE_GUID;
956 memcpy(&dev_desc->guid_sig, &pgpt_head->disk_guid,
958 } else if (mbr->unique_mbr_signature != 0) {
959 dev_desc->sig_type = SIG_TYPE_MBR;
960 dev_desc->mbr_sig = mbr->unique_mbr_signature;
964 /* Read and allocate Partition Table Entries */
965 *pgpt_pte = alloc_read_gpt_entries(dev_desc, pgpt_head);
966 if (*pgpt_pte == NULL) {
967 printf("GPT: Failed to allocate memory for PTE\n");
971 if (validate_gpt_entries(pgpt_head, *pgpt_pte)) {
976 /* We're done, all's well */
981 * find_valid_gpt() - finds a valid GPT header and PTEs
983 * gpt is a GPT header ptr, filled on return.
984 * ptes is a PTEs ptr, filled on return.
986 * Description: returns 1 if found a valid gpt, 0 on error.
987 * If valid, returns pointers to PTEs.
989 static int find_valid_gpt(struct blk_desc *dev_desc, gpt_header *gpt_head,
990 gpt_entry **pgpt_pte)
994 r = is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA, gpt_head,
999 printf("%s: *** ERROR: Invalid GPT ***\n", __func__);
1001 if (is_gpt_valid(dev_desc, (dev_desc->lba - 1), gpt_head,
1003 printf("%s: *** ERROR: Invalid Backup GPT ***\n",
1008 printf("%s: *** Using Backup GPT ***\n",
1015 * alloc_read_gpt_entries(): reads partition entries from disk
1019 * Description: Returns ptes on success, NULL on error.
1020 * Allocates space for PTEs based on information found in @gpt.
1021 * Notes: remember to free pte when you're done!
1023 static gpt_entry *alloc_read_gpt_entries(struct blk_desc *dev_desc,
1024 gpt_header *pgpt_head)
1026 size_t count = 0, blk_cnt;
1028 gpt_entry *pte = NULL;
1030 if (!dev_desc || !pgpt_head) {
1031 printf("%s: Invalid Argument(s)\n", __func__);
1035 count = le32_to_cpu(pgpt_head->num_partition_entries) *
1036 le32_to_cpu(pgpt_head->sizeof_partition_entry);
1038 debug("%s: count = %u * %u = %lu\n", __func__,
1039 (u32) le32_to_cpu(pgpt_head->num_partition_entries),
1040 (u32) le32_to_cpu(pgpt_head->sizeof_partition_entry),
1043 /* Allocate memory for PTE, remember to FREE */
1045 pte = memalign(ARCH_DMA_MINALIGN,
1046 PAD_TO_BLOCKSIZE(count, dev_desc));
1049 if (count == 0 || pte == NULL) {
1050 printf("%s: ERROR: Can't allocate %#lX bytes for GPT Entries\n",
1051 __func__, (ulong)count);
1055 /* Read GPT Entries from device */
1056 blk = le64_to_cpu(pgpt_head->partition_entry_lba);
1057 blk_cnt = BLOCK_CNT(count, dev_desc);
1058 if (blk_dread(dev_desc, blk, (lbaint_t)blk_cnt, pte) != blk_cnt) {
1059 printf("*** ERROR: Can't read GPT Entries ***\n");
1067 * is_pte_valid(): validates a single Partition Table Entry
1068 * @gpt_entry - Pointer to a single Partition Table Entry
1070 * Description: returns 1 if valid, 0 on error.
1072 static int is_pte_valid(gpt_entry * pte)
1074 efi_guid_t unused_guid;
1077 printf("%s: Invalid Argument(s)\n", __func__);
1081 /* Only one validation for now:
1082 * The GUID Partition Type != Unused Entry (ALL-ZERO)
1084 memset(unused_guid.b, 0, sizeof(unused_guid.b));
1086 if (memcmp(pte->partition_type_guid.b, unused_guid.b,
1087 sizeof(unused_guid.b)) == 0) {
1089 debug("%s: Found an unused PTE GUID at 0x%08X\n", __func__,
1090 (unsigned int)(uintptr_t)pte);
1099 * Add an 'a_' prefix so it comes before 'dos' in the linker list. We need to
1100 * check EFI first, since a DOS partition is often used as a 'protective MBR'
1103 U_BOOT_PART_TYPE(a_efi) = {
1105 .part_type = PART_TYPE_EFI,
1106 .max_entries = GPT_ENTRY_NUMBERS,
1107 .get_info = part_get_info_ptr(part_get_info_efi),
1108 .print = part_print_ptr(part_print_efi),
1109 .test = part_test_efi,