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 tebibytes
17 #include <asm/cache.h>
18 #include <asm/unaligned.h>
25 #include <linux/compiler.h>
26 #include <linux/ctype.h>
27 #include <u-boot/crc.h>
29 DECLARE_GLOBAL_DATA_PTR;
32 * GUID for basic data partions.
34 static const efi_guid_t partition_basic_data_guid = PARTITION_BASIC_DATA_GUID;
36 #ifdef CONFIG_HAVE_BLOCK_DEVICE
38 * efi_crc32() - EFI version of crc32 function
39 * @buf: buffer to calculate crc32 of
40 * @len - length of buf
42 * Description: Returns EFI-style CRC32 value for @buf
44 static inline u32 efi_crc32(const void *buf, u32 len)
46 return crc32(0, buf, len);
50 * Private function prototypes
53 static int pmbr_part_valid(struct partition *part);
54 static int is_pmbr_valid(legacy_mbr * mbr);
55 static int is_gpt_valid(struct blk_desc *dev_desc, u64 lba,
56 gpt_header *pgpt_head, gpt_entry **pgpt_pte);
57 static gpt_entry *alloc_read_gpt_entries(struct blk_desc *dev_desc,
58 gpt_header *pgpt_head);
59 static int is_pte_valid(gpt_entry * pte);
60 static int find_valid_gpt(struct blk_desc *dev_desc, gpt_header *gpt_head,
61 gpt_entry **pgpt_pte);
63 static char *print_efiname(gpt_entry *pte)
65 static char name[PARTNAME_SZ + 1];
67 for (i = 0; i < PARTNAME_SZ; i++) {
69 c = pte->partition_name[i] & 0xff;
70 c = (c && !isprint(c)) ? '.' : c;
73 name[PARTNAME_SZ] = 0;
77 static const efi_guid_t system_guid = PARTITION_SYSTEM_GUID;
79 static int get_bootable(gpt_entry *p)
83 if (!memcmp(&p->partition_type_guid, &system_guid, sizeof(efi_guid_t)))
84 ret |= PART_EFI_SYSTEM_PARTITION;
85 if (p->attributes.fields.legacy_bios_bootable)
90 static int validate_gpt_header(gpt_header *gpt_h, lbaint_t lba,
93 uint32_t crc32_backup = 0;
96 /* Check the GPT header signature */
97 if (le64_to_cpu(gpt_h->signature) != GPT_HEADER_SIGNATURE_UBOOT) {
98 printf("%s signature is wrong: 0x%llX != 0x%llX\n",
99 "GUID Partition Table Header",
100 le64_to_cpu(gpt_h->signature),
101 GPT_HEADER_SIGNATURE_UBOOT);
105 /* Check the GUID Partition Table CRC */
106 memcpy(&crc32_backup, &gpt_h->header_crc32, sizeof(crc32_backup));
107 memset(&gpt_h->header_crc32, 0, sizeof(gpt_h->header_crc32));
109 calc_crc32 = efi_crc32((const unsigned char *)gpt_h,
110 le32_to_cpu(gpt_h->header_size));
112 memcpy(&gpt_h->header_crc32, &crc32_backup, sizeof(crc32_backup));
114 if (calc_crc32 != le32_to_cpu(crc32_backup)) {
115 printf("%s CRC is wrong: 0x%x != 0x%x\n",
116 "GUID Partition Table Header",
117 le32_to_cpu(crc32_backup), calc_crc32);
122 * Check that the my_lba entry points to the LBA that contains the GPT
124 if (le64_to_cpu(gpt_h->my_lba) != lba) {
125 printf("GPT: my_lba incorrect: %llX != " LBAF "\n",
126 le64_to_cpu(gpt_h->my_lba),
132 * Check that the first_usable_lba and that the last_usable_lba are
135 if (le64_to_cpu(gpt_h->first_usable_lba) > lastlba) {
136 printf("GPT: first_usable_lba incorrect: %llX > " LBAF "\n",
137 le64_to_cpu(gpt_h->first_usable_lba), lastlba);
140 if (le64_to_cpu(gpt_h->last_usable_lba) > lastlba) {
141 printf("GPT: last_usable_lba incorrect: %llX > " LBAF "\n",
142 le64_to_cpu(gpt_h->last_usable_lba), lastlba);
146 debug("GPT: first_usable_lba: %llX last_usable_lba: %llX last lba: "
147 LBAF "\n", le64_to_cpu(gpt_h->first_usable_lba),
148 le64_to_cpu(gpt_h->last_usable_lba), lastlba);
153 static int validate_gpt_entries(gpt_header *gpt_h, gpt_entry *gpt_e)
157 /* Check the GUID Partition Table Entry Array CRC */
158 calc_crc32 = efi_crc32((const unsigned char *)gpt_e,
159 le32_to_cpu(gpt_h->num_partition_entries) *
160 le32_to_cpu(gpt_h->sizeof_partition_entry));
162 if (calc_crc32 != le32_to_cpu(gpt_h->partition_entry_array_crc32)) {
163 printf("%s: 0x%x != 0x%x\n",
164 "GUID Partition Table Entry Array CRC is wrong",
165 le32_to_cpu(gpt_h->partition_entry_array_crc32),
173 static void prepare_backup_gpt_header(gpt_header *gpt_h)
178 /* recalculate the values for the Backup GPT Header */
179 val = le64_to_cpu(gpt_h->my_lba);
180 gpt_h->my_lba = gpt_h->alternate_lba;
181 gpt_h->alternate_lba = cpu_to_le64(val);
182 gpt_h->partition_entry_lba =
183 cpu_to_le64(le64_to_cpu(gpt_h->last_usable_lba) + 1);
184 gpt_h->header_crc32 = 0;
186 calc_crc32 = efi_crc32((const unsigned char *)gpt_h,
187 le32_to_cpu(gpt_h->header_size));
188 gpt_h->header_crc32 = cpu_to_le32(calc_crc32);
191 #if CONFIG_IS_ENABLED(EFI_PARTITION)
193 * Public Functions (include/part.h)
197 * UUID is displayed as 32 hexadecimal digits, in 5 groups,
198 * separated by hyphens, in the form 8-4-4-4-12 for a total of 36 characters
200 int get_disk_guid(struct blk_desc * dev_desc, char *guid)
202 ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_head, 1, dev_desc->blksz);
203 gpt_entry *gpt_pte = NULL;
204 unsigned char *guid_bin;
206 /* This function validates AND fills in the GPT header and PTE */
207 if (find_valid_gpt(dev_desc, gpt_head, &gpt_pte) != 1)
210 guid_bin = gpt_head->disk_guid.b;
211 uuid_bin_to_str(guid_bin, guid, UUID_STR_FORMAT_GUID);
213 /* Remember to free pte */
218 void part_print_efi(struct blk_desc *dev_desc)
220 ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_head, 1, dev_desc->blksz);
221 gpt_entry *gpt_pte = NULL;
223 char uuid[UUID_STR_LEN + 1];
224 unsigned char *uuid_bin;
226 /* This function validates AND fills in the GPT header and PTE */
227 if (find_valid_gpt(dev_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 /* Stop at the first non valid 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_bin = (unsigned char *)gpt_pte[i].partition_type_guid.b;
248 uuid_bin_to_str(uuid_bin, uuid, UUID_STR_FORMAT_GUID);
249 printf("\ttype:\t%s\n", uuid);
250 #ifdef CONFIG_PARTITION_TYPE_GUID
251 if (!uuid_guid_get_str(uuid_bin, uuid))
252 printf("\ttype:\t%s\n", uuid);
254 uuid_bin = (unsigned char *)gpt_pte[i].unique_partition_guid.b;
255 uuid_bin_to_str(uuid_bin, uuid, UUID_STR_FORMAT_GUID);
256 printf("\tguid:\t%s\n", uuid);
259 /* Remember to free pte */
264 int part_get_info_efi(struct blk_desc *dev_desc, int part,
265 struct disk_partition *info)
267 ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_head, 1, dev_desc->blksz);
268 gpt_entry *gpt_pte = NULL;
270 /* "part" argument must be at least 1 */
272 printf("%s: Invalid Argument(s)\n", __func__);
276 /* This function validates AND fills in the GPT header and PTE */
277 if (find_valid_gpt(dev_desc, gpt_head, &gpt_pte) != 1)
280 if (part > le32_to_cpu(gpt_head->num_partition_entries) ||
281 !is_pte_valid(&gpt_pte[part - 1])) {
282 debug("%s: *** ERROR: Invalid partition number %d ***\n",
288 /* The 'lbaint_t' casting may limit the maximum disk size to 2 TB */
289 info->start = (lbaint_t)le64_to_cpu(gpt_pte[part - 1].starting_lba);
290 /* The ending LBA is inclusive, to calculate size, add 1 to it */
291 info->size = (lbaint_t)le64_to_cpu(gpt_pte[part - 1].ending_lba) + 1
293 info->blksz = dev_desc->blksz;
295 snprintf((char *)info->name, sizeof(info->name), "%s",
296 print_efiname(&gpt_pte[part - 1]));
297 strcpy((char *)info->type, "U-Boot");
298 info->bootable = get_bootable(&gpt_pte[part - 1]);
299 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
300 uuid_bin_to_str(gpt_pte[part - 1].unique_partition_guid.b, info->uuid,
301 UUID_STR_FORMAT_GUID);
303 #ifdef CONFIG_PARTITION_TYPE_GUID
304 uuid_bin_to_str(gpt_pte[part - 1].partition_type_guid.b,
305 info->type_guid, UUID_STR_FORMAT_GUID);
308 debug("%s: start 0x" LBAF ", size 0x" LBAF ", name %s\n", __func__,
309 info->start, info->size, info->name);
311 /* Remember to free pte */
316 static int part_test_efi(struct blk_desc *dev_desc)
318 ALLOC_CACHE_ALIGN_BUFFER_PAD(legacy_mbr, legacymbr, 1, dev_desc->blksz);
320 /* Read legacy MBR from block 0 and validate it */
321 if ((blk_dread(dev_desc, 0, 1, (ulong *)legacymbr) != 1)
322 || (is_pmbr_valid(legacymbr) != 1)) {
329 * set_protective_mbr(): Set the EFI protective MBR
330 * @param dev_desc - block device descriptor
332 * @return - zero on success, otherwise error
334 static int set_protective_mbr(struct blk_desc *dev_desc)
336 /* Setup the Protective MBR */
337 ALLOC_CACHE_ALIGN_BUFFER_PAD(legacy_mbr, p_mbr, 1, dev_desc->blksz);
339 printf("%s: calloc failed!\n", __func__);
343 /* Read MBR to backup boot code if it exists */
344 if (blk_dread(dev_desc, 0, 1, p_mbr) != 1) {
345 pr_err("** Can't read from device %d **\n", dev_desc->devnum);
349 /* Clear all data in MBR except of backed up boot code */
350 memset((char *)p_mbr + MSDOS_MBR_BOOT_CODE_SIZE, 0, sizeof(*p_mbr) -
351 MSDOS_MBR_BOOT_CODE_SIZE);
353 /* Append signature */
354 p_mbr->signature = MSDOS_MBR_SIGNATURE;
355 p_mbr->partition_record[0].sys_ind = EFI_PMBR_OSTYPE_EFI_GPT;
356 p_mbr->partition_record[0].start_sect = 1;
357 p_mbr->partition_record[0].nr_sects = (u32) dev_desc->lba - 1;
359 /* Write MBR sector to the MMC device */
360 if (blk_dwrite(dev_desc, 0, 1, p_mbr) != 1) {
361 printf("** Can't write to device %d **\n",
369 int write_gpt_table(struct blk_desc *dev_desc,
370 gpt_header *gpt_h, gpt_entry *gpt_e)
372 const int pte_blk_cnt = BLOCK_CNT((gpt_h->num_partition_entries
373 * sizeof(gpt_entry)), dev_desc);
376 debug("max lba: %x\n", (u32) dev_desc->lba);
377 /* Setup the Protective MBR */
378 if (set_protective_mbr(dev_desc) < 0)
381 /* Generate CRC for the Primary GPT Header */
382 calc_crc32 = efi_crc32((const unsigned char *)gpt_e,
383 le32_to_cpu(gpt_h->num_partition_entries) *
384 le32_to_cpu(gpt_h->sizeof_partition_entry));
385 gpt_h->partition_entry_array_crc32 = cpu_to_le32(calc_crc32);
387 calc_crc32 = efi_crc32((const unsigned char *)gpt_h,
388 le32_to_cpu(gpt_h->header_size));
389 gpt_h->header_crc32 = cpu_to_le32(calc_crc32);
391 /* Write the First GPT to the block right after the Legacy MBR */
392 if (blk_dwrite(dev_desc, 1, 1, gpt_h) != 1)
395 if (blk_dwrite(dev_desc, le64_to_cpu(gpt_h->partition_entry_lba),
396 pte_blk_cnt, gpt_e) != pte_blk_cnt)
399 prepare_backup_gpt_header(gpt_h);
401 if (blk_dwrite(dev_desc, (lbaint_t)le64_to_cpu(gpt_h->last_usable_lba)
402 + 1, pte_blk_cnt, gpt_e) != pte_blk_cnt)
405 if (blk_dwrite(dev_desc, (lbaint_t)le64_to_cpu(gpt_h->my_lba), 1,
409 debug("GPT successfully written to block device!\n");
413 printf("** Can't write to device %d **\n", dev_desc->devnum);
417 int gpt_fill_pte(struct blk_desc *dev_desc,
418 gpt_header *gpt_h, gpt_entry *gpt_e,
419 struct disk_partition *partitions, int parts)
421 lbaint_t offset = (lbaint_t)le64_to_cpu(gpt_h->first_usable_lba);
422 lbaint_t last_usable_lba = (lbaint_t)
423 le64_to_cpu(gpt_h->last_usable_lba);
425 size_t efiname_len, dosname_len;
426 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
428 unsigned char *bin_uuid;
430 #ifdef CONFIG_PARTITION_TYPE_GUID
432 unsigned char *bin_type_guid;
434 size_t hdr_start = gpt_h->my_lba;
435 size_t hdr_end = hdr_start + 1;
437 size_t pte_start = gpt_h->partition_entry_lba;
438 size_t pte_end = pte_start +
439 gpt_h->num_partition_entries * gpt_h->sizeof_partition_entry /
442 for (i = 0; i < parts; i++) {
443 /* partition starting lba */
444 lbaint_t start = partitions[i].start;
445 lbaint_t size = partitions[i].size;
448 offset = start + size;
455 * If our partition overlaps with either the GPT
456 * header, or the partition entry, reject it.
458 if (((start < hdr_end && hdr_start < (start + size)) ||
459 (start < pte_end && pte_start < (start + size)))) {
460 printf("Partition overlap\n");
464 gpt_e[i].starting_lba = cpu_to_le64(start);
466 if (offset > (last_usable_lba + 1)) {
467 printf("Partitions layout exceds disk size\n");
470 /* partition ending lba */
471 if ((i == parts - 1) && (size == 0))
472 /* extend the last partition to maximuim */
473 gpt_e[i].ending_lba = gpt_h->last_usable_lba;
475 gpt_e[i].ending_lba = cpu_to_le64(offset - 1);
477 #ifdef CONFIG_PARTITION_TYPE_GUID
478 str_type_guid = partitions[i].type_guid;
479 bin_type_guid = gpt_e[i].partition_type_guid.b;
480 if (strlen(str_type_guid)) {
481 if (uuid_str_to_bin(str_type_guid, bin_type_guid,
482 UUID_STR_FORMAT_GUID)) {
483 printf("Partition no. %d: invalid type guid: %s\n",
488 /* default partition type GUID */
489 memcpy(bin_type_guid,
490 &partition_basic_data_guid, 16);
493 /* partition type GUID */
494 memcpy(gpt_e[i].partition_type_guid.b,
495 &partition_basic_data_guid, 16);
498 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
499 str_uuid = partitions[i].uuid;
500 bin_uuid = gpt_e[i].unique_partition_guid.b;
502 if (uuid_str_to_bin(str_uuid, bin_uuid, UUID_STR_FORMAT_GUID)) {
503 printf("Partition no. %d: invalid guid: %s\n",
509 /* partition attributes */
510 memset(&gpt_e[i].attributes, 0,
511 sizeof(gpt_entry_attributes));
513 if (partitions[i].bootable & PART_BOOTABLE)
514 gpt_e[i].attributes.fields.legacy_bios_bootable = 1;
517 efiname_len = sizeof(gpt_e[i].partition_name)
518 / sizeof(efi_char16_t);
519 dosname_len = sizeof(partitions[i].name);
521 memset(gpt_e[i].partition_name, 0,
522 sizeof(gpt_e[i].partition_name));
524 for (k = 0; k < min(dosname_len, efiname_len); k++)
525 gpt_e[i].partition_name[k] =
526 (efi_char16_t)(partitions[i].name[k]);
528 debug("%s: name: %s offset[%d]: 0x" LBAF
529 " size[%d]: 0x" LBAF "\n",
530 __func__, partitions[i].name, i,
537 static uint32_t partition_entries_offset(struct blk_desc *dev_desc)
539 uint32_t offset_blks = 2;
540 uint32_t __maybe_unused offset_bytes;
541 int __maybe_unused config_offset;
543 #if defined(CONFIG_EFI_PARTITION_ENTRIES_OFF)
545 * Some architectures require their SPL loader at a fixed
546 * address within the first 16KB of the disk. To avoid an
547 * overlap with the partition entries of the EFI partition
548 * table, the first safe offset (in bytes, from the start of
549 * the disk) for the entries can be set in
550 * CONFIG_EFI_PARTITION_ENTRIES_OFF.
553 PAD_TO_BLOCKSIZE(CONFIG_EFI_PARTITION_ENTRIES_OFF, dev_desc);
554 offset_blks = offset_bytes / dev_desc->blksz;
557 #if defined(CONFIG_OF_CONTROL)
559 * Allow the offset of the first partition entires (in bytes
560 * from the start of the device) to be specified as a property
561 * of the device tree '/config' node.
563 config_offset = fdtdec_get_config_int(gd->fdt_blob,
564 "u-boot,efi-partition-entries-offset",
566 if (config_offset != -EINVAL) {
567 offset_bytes = PAD_TO_BLOCKSIZE(config_offset, dev_desc);
568 offset_blks = offset_bytes / dev_desc->blksz;
572 debug("efi: partition entries offset (in blocks): %d\n", offset_blks);
575 * The earliest LBA this can be at is LBA#2 (i.e. right behind
576 * the (protective) MBR and the GPT header.
584 int gpt_fill_header(struct blk_desc *dev_desc, gpt_header *gpt_h,
585 char *str_guid, int parts_count)
587 gpt_h->signature = cpu_to_le64(GPT_HEADER_SIGNATURE_UBOOT);
588 gpt_h->revision = cpu_to_le32(GPT_HEADER_REVISION_V1);
589 gpt_h->header_size = cpu_to_le32(sizeof(gpt_header));
590 gpt_h->my_lba = cpu_to_le64(1);
591 gpt_h->alternate_lba = cpu_to_le64(dev_desc->lba - 1);
592 gpt_h->last_usable_lba = cpu_to_le64(dev_desc->lba - 34);
593 gpt_h->partition_entry_lba =
594 cpu_to_le64(partition_entries_offset(dev_desc));
595 gpt_h->first_usable_lba =
596 cpu_to_le64(le64_to_cpu(gpt_h->partition_entry_lba) + 32);
597 gpt_h->num_partition_entries = cpu_to_le32(GPT_ENTRY_NUMBERS);
598 gpt_h->sizeof_partition_entry = cpu_to_le32(sizeof(gpt_entry));
599 gpt_h->header_crc32 = 0;
600 gpt_h->partition_entry_array_crc32 = 0;
602 if (uuid_str_to_bin(str_guid, gpt_h->disk_guid.b, UUID_STR_FORMAT_GUID))
608 int gpt_restore(struct blk_desc *dev_desc, char *str_disk_guid,
609 struct disk_partition *partitions, int parts_count)
615 size = PAD_TO_BLOCKSIZE(sizeof(gpt_header), dev_desc);
616 gpt_h = malloc_cache_aligned(size);
618 printf("%s: calloc failed!\n", __func__);
621 memset(gpt_h, 0, size);
623 size = PAD_TO_BLOCKSIZE(GPT_ENTRY_NUMBERS * sizeof(gpt_entry),
625 gpt_e = malloc_cache_aligned(size);
627 printf("%s: calloc failed!\n", __func__);
631 memset(gpt_e, 0, size);
633 /* Generate Primary GPT header (LBA1) */
634 ret = gpt_fill_header(dev_desc, gpt_h, str_disk_guid, parts_count);
638 /* Generate partition entries */
639 ret = gpt_fill_pte(dev_desc, gpt_h, gpt_e, partitions, parts_count);
643 /* Write GPT partition table */
644 ret = write_gpt_table(dev_desc, gpt_h, gpt_e);
653 * gpt_convert_efi_name_to_char() - convert u16 string to char string
655 * TODO: this conversion only supports ANSI characters
658 * @es: u16 string to be converted
659 * @n: size of target buffer
661 static void gpt_convert_efi_name_to_char(char *s, void *es, int n)
668 for (i = 0, j = 0; j < n; i += 2, j++) {
675 int gpt_verify_headers(struct blk_desc *dev_desc, gpt_header *gpt_head,
679 * This function validates AND
680 * fills in the GPT header and PTE
682 if (is_gpt_valid(dev_desc,
683 GPT_PRIMARY_PARTITION_TABLE_LBA,
684 gpt_head, gpt_pte) != 1) {
685 printf("%s: *** ERROR: Invalid GPT ***\n",
690 /* Free pte before allocating again */
693 if (is_gpt_valid(dev_desc, (dev_desc->lba - 1),
694 gpt_head, gpt_pte) != 1) {
695 printf("%s: *** ERROR: Invalid Backup GPT ***\n",
703 int gpt_verify_partitions(struct blk_desc *dev_desc,
704 struct disk_partition *partitions, int parts,
705 gpt_header *gpt_head, gpt_entry **gpt_pte)
707 char efi_str[PARTNAME_SZ + 1];
712 ret = gpt_verify_headers(dev_desc, gpt_head, gpt_pte);
718 for (i = 0; i < parts; i++) {
719 if (i == gpt_head->num_partition_entries) {
720 pr_err("More partitions than allowed!\n");
724 /* Check if GPT and ENV partition names match */
725 gpt_convert_efi_name_to_char(efi_str, gpt_e[i].partition_name,
728 debug("%s: part: %2d name - GPT: %16s, ENV: %16s ",
729 __func__, i, efi_str, partitions[i].name);
731 if (strncmp(efi_str, (char *)partitions[i].name,
732 sizeof(partitions->name))) {
733 pr_err("Partition name: %s does not match %s!\n",
734 efi_str, (char *)partitions[i].name);
738 /* Check if GPT and ENV sizes match */
739 gpt_part_size = le64_to_cpu(gpt_e[i].ending_lba) -
740 le64_to_cpu(gpt_e[i].starting_lba) + 1;
741 debug("size(LBA) - GPT: %8llu, ENV: %8llu ",
742 (unsigned long long)gpt_part_size,
743 (unsigned long long)partitions[i].size);
745 if (le64_to_cpu(gpt_part_size) != partitions[i].size) {
746 /* We do not check the extend partition size */
747 if ((i == parts - 1) && (partitions[i].size == 0))
750 pr_err("Partition %s size: %llu does not match %llu!\n",
751 efi_str, (unsigned long long)gpt_part_size,
752 (unsigned long long)partitions[i].size);
757 * Start address is optional - check only if provided
758 * in '$partition' variable
760 if (!partitions[i].start) {
765 /* Check if GPT and ENV start LBAs match */
766 debug("start LBA - GPT: %8llu, ENV: %8llu\n",
767 le64_to_cpu(gpt_e[i].starting_lba),
768 (unsigned long long)partitions[i].start);
770 if (le64_to_cpu(gpt_e[i].starting_lba) != partitions[i].start) {
771 pr_err("Partition %s start: %llu does not match %llu!\n",
772 efi_str, le64_to_cpu(gpt_e[i].starting_lba),
773 (unsigned long long)partitions[i].start);
781 int is_valid_gpt_buf(struct blk_desc *dev_desc, void *buf)
786 /* determine start of GPT Header in the buffer */
787 gpt_h = buf + (GPT_PRIMARY_PARTITION_TABLE_LBA *
789 if (validate_gpt_header(gpt_h, GPT_PRIMARY_PARTITION_TABLE_LBA,
793 /* determine start of GPT Entries in the buffer */
794 gpt_e = buf + (le64_to_cpu(gpt_h->partition_entry_lba) *
796 if (validate_gpt_entries(gpt_h, gpt_e))
802 int write_mbr_and_gpt_partitions(struct blk_desc *dev_desc, void *buf)
810 if (is_valid_gpt_buf(dev_desc, buf))
813 /* determine start of GPT Header in the buffer */
814 gpt_h = buf + (GPT_PRIMARY_PARTITION_TABLE_LBA *
817 /* determine start of GPT Entries in the buffer */
818 gpt_e = buf + (le64_to_cpu(gpt_h->partition_entry_lba) *
820 gpt_e_blk_cnt = BLOCK_CNT((le32_to_cpu(gpt_h->num_partition_entries) *
821 le32_to_cpu(gpt_h->sizeof_partition_entry)),
825 lba = 0; /* MBR is always at 0 */
826 cnt = 1; /* MBR (1 block) */
827 if (blk_dwrite(dev_desc, lba, cnt, buf) != cnt) {
828 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n",
829 __func__, "MBR", cnt, lba);
833 /* write Primary GPT */
834 lba = GPT_PRIMARY_PARTITION_TABLE_LBA;
835 cnt = 1; /* GPT Header (1 block) */
836 if (blk_dwrite(dev_desc, lba, cnt, gpt_h) != cnt) {
837 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n",
838 __func__, "Primary GPT Header", cnt, lba);
842 lba = le64_to_cpu(gpt_h->partition_entry_lba);
844 if (blk_dwrite(dev_desc, lba, cnt, gpt_e) != cnt) {
845 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n",
846 __func__, "Primary GPT Entries", cnt, lba);
850 prepare_backup_gpt_header(gpt_h);
852 /* write Backup GPT */
853 lba = le64_to_cpu(gpt_h->partition_entry_lba);
855 if (blk_dwrite(dev_desc, lba, cnt, gpt_e) != cnt) {
856 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n",
857 __func__, "Backup GPT Entries", cnt, lba);
861 lba = le64_to_cpu(gpt_h->my_lba);
862 cnt = 1; /* GPT Header (1 block) */
863 if (blk_dwrite(dev_desc, lba, cnt, gpt_h) != cnt) {
864 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n",
865 __func__, "Backup GPT Header", cnt, lba);
877 * pmbr_part_valid(): Check for EFI partition signature
879 * Returns: 1 if EFI GPT partition type is found.
881 static int pmbr_part_valid(struct partition *part)
883 if (part->sys_ind == EFI_PMBR_OSTYPE_EFI_GPT &&
884 get_unaligned_le32(&part->start_sect) == 1UL) {
892 * is_pmbr_valid(): test Protective MBR for validity
894 * Returns: 1 if PMBR is valid, 0 otherwise.
895 * Validity depends on two things:
896 * 1) MSDOS signature is in the last two bytes of the MBR
897 * 2) One partition of type 0xEE is found, checked by pmbr_part_valid()
899 static int is_pmbr_valid(legacy_mbr * mbr)
903 if (!mbr || le16_to_cpu(mbr->signature) != MSDOS_MBR_SIGNATURE)
906 for (i = 0; i < 4; i++) {
907 if (pmbr_part_valid(&mbr->partition_record[i])) {
915 * is_gpt_valid() - tests one GPT header and PTEs for validity
917 * lba is the logical block address of the GPT header to test
918 * gpt is a GPT header ptr, filled on return.
919 * ptes is a PTEs ptr, filled on return.
921 * Description: returns 1 if valid, 0 on error, 2 if ignored header
922 * If valid, returns pointers to PTEs.
924 static int is_gpt_valid(struct blk_desc *dev_desc, u64 lba,
925 gpt_header *pgpt_head, gpt_entry **pgpt_pte)
927 /* Confirm valid arguments prior to allocation. */
928 if (!dev_desc || !pgpt_head) {
929 printf("%s: Invalid Argument(s)\n", __func__);
933 ALLOC_CACHE_ALIGN_BUFFER_PAD(legacy_mbr, mbr, 1, dev_desc->blksz);
935 /* Read MBR Header from device */
936 if (blk_dread(dev_desc, 0, 1, (ulong *)mbr) != 1) {
937 printf("*** ERROR: Can't read MBR header ***\n");
941 /* Read GPT Header from device */
942 if (blk_dread(dev_desc, (lbaint_t)lba, 1, pgpt_head) != 1) {
943 printf("*** ERROR: Can't read GPT header ***\n");
947 /* Invalid but nothing to yell about. */
948 if (le64_to_cpu(pgpt_head->signature) == GPT_HEADER_CHROMEOS_IGNORE) {
949 debug("ChromeOS 'IGNOREME' GPT header found and ignored\n");
953 if (validate_gpt_header(pgpt_head, (lbaint_t)lba, dev_desc->lba))
956 if (dev_desc->sig_type == SIG_TYPE_NONE) {
957 efi_guid_t empty = {};
958 if (memcmp(&pgpt_head->disk_guid, &empty, sizeof(empty))) {
959 dev_desc->sig_type = SIG_TYPE_GUID;
960 memcpy(&dev_desc->guid_sig, &pgpt_head->disk_guid,
962 } else if (mbr->unique_mbr_signature != 0) {
963 dev_desc->sig_type = SIG_TYPE_MBR;
964 dev_desc->mbr_sig = mbr->unique_mbr_signature;
968 /* Read and allocate Partition Table Entries */
969 *pgpt_pte = alloc_read_gpt_entries(dev_desc, pgpt_head);
970 if (*pgpt_pte == NULL) {
971 printf("GPT: Failed to allocate memory for PTE\n");
975 if (validate_gpt_entries(pgpt_head, *pgpt_pte)) {
980 /* We're done, all's well */
985 * find_valid_gpt() - finds a valid GPT header and PTEs
987 * gpt is a GPT header ptr, filled on return.
988 * ptes is a PTEs ptr, filled on return.
990 * Description: returns 1 if found a valid gpt, 0 on error.
991 * If valid, returns pointers to PTEs.
993 static int find_valid_gpt(struct blk_desc *dev_desc, gpt_header *gpt_head,
994 gpt_entry **pgpt_pte)
998 r = is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA, gpt_head,
1003 printf("%s: *** ERROR: Invalid GPT ***\n", __func__);
1005 if (is_gpt_valid(dev_desc, (dev_desc->lba - 1), gpt_head,
1007 printf("%s: *** ERROR: Invalid Backup GPT ***\n",
1012 printf("%s: *** Using Backup GPT ***\n",
1019 * alloc_read_gpt_entries(): reads partition entries from disk
1023 * Description: Returns ptes on success, NULL on error.
1024 * Allocates space for PTEs based on information found in @gpt.
1025 * Notes: remember to free pte when you're done!
1027 static gpt_entry *alloc_read_gpt_entries(struct blk_desc *dev_desc,
1028 gpt_header *pgpt_head)
1030 size_t count = 0, blk_cnt;
1032 gpt_entry *pte = NULL;
1034 if (!dev_desc || !pgpt_head) {
1035 printf("%s: Invalid Argument(s)\n", __func__);
1039 count = le32_to_cpu(pgpt_head->num_partition_entries) *
1040 le32_to_cpu(pgpt_head->sizeof_partition_entry);
1042 debug("%s: count = %u * %u = %lu\n", __func__,
1043 (u32) le32_to_cpu(pgpt_head->num_partition_entries),
1044 (u32) le32_to_cpu(pgpt_head->sizeof_partition_entry),
1047 /* Allocate memory for PTE, remember to FREE */
1049 pte = memalign(ARCH_DMA_MINALIGN,
1050 PAD_TO_BLOCKSIZE(count, dev_desc));
1053 if (count == 0 || pte == NULL) {
1054 printf("%s: ERROR: Can't allocate %#lX bytes for GPT Entries\n",
1055 __func__, (ulong)count);
1059 /* Read GPT Entries from device */
1060 blk = le64_to_cpu(pgpt_head->partition_entry_lba);
1061 blk_cnt = BLOCK_CNT(count, dev_desc);
1062 if (blk_dread(dev_desc, blk, (lbaint_t)blk_cnt, pte) != blk_cnt) {
1063 printf("*** ERROR: Can't read GPT Entries ***\n");
1071 * is_pte_valid(): validates a single Partition Table Entry
1072 * @gpt_entry - Pointer to a single Partition Table Entry
1074 * Description: returns 1 if valid, 0 on error.
1076 static int is_pte_valid(gpt_entry * pte)
1078 efi_guid_t unused_guid;
1081 printf("%s: Invalid Argument(s)\n", __func__);
1085 /* Only one validation for now:
1086 * The GUID Partition Type != Unused Entry (ALL-ZERO)
1088 memset(unused_guid.b, 0, sizeof(unused_guid.b));
1090 if (memcmp(pte->partition_type_guid.b, unused_guid.b,
1091 sizeof(unused_guid.b)) == 0) {
1093 debug("%s: Found an unused PTE GUID at 0x%08X\n", __func__,
1094 (unsigned int)(uintptr_t)pte);
1103 * Add an 'a_' prefix so it comes before 'dos' in the linker list. We need to
1104 * check EFI first, since a DOS partition is often used as a 'protective MBR'
1107 U_BOOT_PART_TYPE(a_efi) = {
1109 .part_type = PART_TYPE_EFI,
1110 .max_entries = GPT_ENTRY_NUMBERS,
1111 .get_info = part_get_info_ptr(part_get_info_efi),
1112 .print = part_print_ptr(part_print_efi),
1113 .test = part_test_efi,