2 * Copyright (C) 2008 RuggedCom, Inc.
3 * Richard Retanubun <RichardRetanubun@RuggedCom.com>
5 * SPDX-License-Identifier: GPL-2.0+
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
13 #include <asm/unaligned.h>
22 #include <linux/compiler.h>
23 #include <linux/ctype.h>
25 DECLARE_GLOBAL_DATA_PTR;
27 #ifdef HAVE_BLOCK_DEVICE
29 * efi_crc32() - EFI version of crc32 function
30 * @buf: buffer to calculate crc32 of
31 * @len - length of buf
33 * Description: Returns EFI-style CRC32 value for @buf
35 static inline u32 efi_crc32(const void *buf, u32 len)
37 return crc32(0, buf, len);
41 * Private function prototypes
44 static int pmbr_part_valid(struct partition *part);
45 static int is_pmbr_valid(legacy_mbr * mbr);
46 static int is_gpt_valid(struct blk_desc *dev_desc, u64 lba,
47 gpt_header *pgpt_head, gpt_entry **pgpt_pte);
48 static gpt_entry *alloc_read_gpt_entries(struct blk_desc *dev_desc,
49 gpt_header *pgpt_head);
50 static int is_pte_valid(gpt_entry * pte);
52 static char *print_efiname(gpt_entry *pte)
54 static char name[PARTNAME_SZ + 1];
56 for (i = 0; i < PARTNAME_SZ; i++) {
58 c = pte->partition_name[i] & 0xff;
59 c = (c && !isprint(c)) ? '.' : c;
62 name[PARTNAME_SZ] = 0;
66 static efi_guid_t system_guid = PARTITION_SYSTEM_GUID;
68 static inline int is_bootable(gpt_entry *p)
70 return p->attributes.fields.legacy_bios_bootable ||
71 !memcmp(&(p->partition_type_guid), &system_guid,
75 static int validate_gpt_header(gpt_header *gpt_h, lbaint_t lba,
78 uint32_t crc32_backup = 0;
81 /* Check the GPT header signature */
82 if (le64_to_cpu(gpt_h->signature) != GPT_HEADER_SIGNATURE) {
83 printf("%s signature is wrong: 0x%llX != 0x%llX\n",
84 "GUID Partition Table Header",
85 le64_to_cpu(gpt_h->signature),
86 GPT_HEADER_SIGNATURE);
90 /* Check the GUID Partition Table CRC */
91 memcpy(&crc32_backup, &gpt_h->header_crc32, sizeof(crc32_backup));
92 memset(&gpt_h->header_crc32, 0, sizeof(gpt_h->header_crc32));
94 calc_crc32 = efi_crc32((const unsigned char *)gpt_h,
95 le32_to_cpu(gpt_h->header_size));
97 memcpy(&gpt_h->header_crc32, &crc32_backup, sizeof(crc32_backup));
99 if (calc_crc32 != le32_to_cpu(crc32_backup)) {
100 printf("%s CRC is wrong: 0x%x != 0x%x\n",
101 "GUID Partition Table Header",
102 le32_to_cpu(crc32_backup), calc_crc32);
107 * Check that the my_lba entry points to the LBA that contains the GPT
109 if (le64_to_cpu(gpt_h->my_lba) != lba) {
110 printf("GPT: my_lba incorrect: %llX != " LBAF "\n",
111 le64_to_cpu(gpt_h->my_lba),
117 * Check that the first_usable_lba and that the last_usable_lba are
120 if (le64_to_cpu(gpt_h->first_usable_lba) > lastlba) {
121 printf("GPT: first_usable_lba incorrect: %llX > " LBAF "\n",
122 le64_to_cpu(gpt_h->first_usable_lba), lastlba);
125 if (le64_to_cpu(gpt_h->last_usable_lba) > lastlba) {
126 printf("GPT: last_usable_lba incorrect: %llX > " LBAF "\n",
127 le64_to_cpu(gpt_h->last_usable_lba), lastlba);
131 debug("GPT: first_usable_lba: %llX last_usable_lba: %llX last lba: "
132 LBAF "\n", le64_to_cpu(gpt_h->first_usable_lba),
133 le64_to_cpu(gpt_h->last_usable_lba), lastlba);
138 static int validate_gpt_entries(gpt_header *gpt_h, gpt_entry *gpt_e)
142 /* Check the GUID Partition Table Entry Array CRC */
143 calc_crc32 = efi_crc32((const unsigned char *)gpt_e,
144 le32_to_cpu(gpt_h->num_partition_entries) *
145 le32_to_cpu(gpt_h->sizeof_partition_entry));
147 if (calc_crc32 != le32_to_cpu(gpt_h->partition_entry_array_crc32)) {
148 printf("%s: 0x%x != 0x%x\n",
149 "GUID Partition Table Entry Array CRC is wrong",
150 le32_to_cpu(gpt_h->partition_entry_array_crc32),
158 static void prepare_backup_gpt_header(gpt_header *gpt_h)
163 /* recalculate the values for the Backup GPT Header */
164 val = le64_to_cpu(gpt_h->my_lba);
165 gpt_h->my_lba = gpt_h->alternate_lba;
166 gpt_h->alternate_lba = cpu_to_le64(val);
167 gpt_h->partition_entry_lba =
168 cpu_to_le64(le64_to_cpu(gpt_h->last_usable_lba) + 1);
169 gpt_h->header_crc32 = 0;
171 calc_crc32 = efi_crc32((const unsigned char *)gpt_h,
172 le32_to_cpu(gpt_h->header_size));
173 gpt_h->header_crc32 = cpu_to_le32(calc_crc32);
176 #if CONFIG_IS_ENABLED(EFI_PARTITION)
178 * Public Functions (include/part.h)
181 void part_print_efi(struct blk_desc *dev_desc)
183 ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_head, 1, dev_desc->blksz);
184 gpt_entry *gpt_pte = NULL;
187 unsigned char *uuid_bin;
189 /* This function validates AND fills in the GPT header and PTE */
190 if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA,
191 gpt_head, &gpt_pte) != 1) {
192 printf("%s: *** ERROR: Invalid GPT ***\n", __func__);
193 if (is_gpt_valid(dev_desc, (dev_desc->lba - 1),
194 gpt_head, &gpt_pte) != 1) {
195 printf("%s: *** ERROR: Invalid Backup GPT ***\n",
199 printf("%s: *** Using Backup GPT ***\n",
204 debug("%s: gpt-entry at %p\n", __func__, gpt_pte);
206 printf("Part\tStart LBA\tEnd LBA\t\tName\n");
207 printf("\tAttributes\n");
208 printf("\tType GUID\n");
209 printf("\tPartition GUID\n");
211 for (i = 0; i < le32_to_cpu(gpt_head->num_partition_entries); i++) {
212 /* Stop at the first non valid PTE */
213 if (!is_pte_valid(&gpt_pte[i]))
216 printf("%3d\t0x%08llx\t0x%08llx\t\"%s\"\n", (i + 1),
217 le64_to_cpu(gpt_pte[i].starting_lba),
218 le64_to_cpu(gpt_pte[i].ending_lba),
219 print_efiname(&gpt_pte[i]));
220 printf("\tattrs:\t0x%016llx\n", gpt_pte[i].attributes.raw);
221 uuid_bin = (unsigned char *)gpt_pte[i].partition_type_guid.b;
222 uuid_bin_to_str(uuid_bin, uuid, UUID_STR_FORMAT_GUID);
223 printf("\ttype:\t%s\n", uuid);
224 #ifdef CONFIG_PARTITION_TYPE_GUID
225 if (!uuid_guid_get_str(uuid_bin, uuid))
226 printf("\ttype:\t%s\n", uuid);
228 uuid_bin = (unsigned char *)gpt_pte[i].unique_partition_guid.b;
229 uuid_bin_to_str(uuid_bin, uuid, UUID_STR_FORMAT_GUID);
230 printf("\tguid:\t%s\n", uuid);
233 /* Remember to free pte */
238 int part_get_info_efi(struct blk_desc *dev_desc, int part,
239 disk_partition_t *info)
241 ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_head, 1, dev_desc->blksz);
242 gpt_entry *gpt_pte = NULL;
244 /* "part" argument must be at least 1 */
246 printf("%s: Invalid Argument(s)\n", __func__);
250 /* This function validates AND fills in the GPT header and PTE */
251 if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA,
252 gpt_head, &gpt_pte) != 1) {
253 printf("%s: *** ERROR: Invalid GPT ***\n", __func__);
254 if (is_gpt_valid(dev_desc, (dev_desc->lba - 1),
255 gpt_head, &gpt_pte) != 1) {
256 printf("%s: *** ERROR: Invalid Backup GPT ***\n",
260 printf("%s: *** Using Backup GPT ***\n",
265 if (part > le32_to_cpu(gpt_head->num_partition_entries) ||
266 !is_pte_valid(&gpt_pte[part - 1])) {
267 debug("%s: *** ERROR: Invalid partition number %d ***\n",
273 /* The 'lbaint_t' casting may limit the maximum disk size to 2 TB */
274 info->start = (lbaint_t)le64_to_cpu(gpt_pte[part - 1].starting_lba);
275 /* The ending LBA is inclusive, to calculate size, add 1 to it */
276 info->size = (lbaint_t)le64_to_cpu(gpt_pte[part - 1].ending_lba) + 1
278 info->blksz = dev_desc->blksz;
280 sprintf((char *)info->name, "%s",
281 print_efiname(&gpt_pte[part - 1]));
282 strcpy((char *)info->type, "U-Boot");
283 info->bootable = is_bootable(&gpt_pte[part - 1]);
284 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
285 uuid_bin_to_str(gpt_pte[part - 1].unique_partition_guid.b, info->uuid,
286 UUID_STR_FORMAT_GUID);
288 #ifdef CONFIG_PARTITION_TYPE_GUID
289 uuid_bin_to_str(gpt_pte[part - 1].partition_type_guid.b,
290 info->type_guid, UUID_STR_FORMAT_GUID);
293 debug("%s: start 0x" LBAF ", size 0x" LBAF ", name %s\n", __func__,
294 info->start, info->size, info->name);
296 /* Remember to free pte */
301 static int part_test_efi(struct blk_desc *dev_desc)
303 ALLOC_CACHE_ALIGN_BUFFER_PAD(legacy_mbr, legacymbr, 1, dev_desc->blksz);
305 /* Read legacy MBR from block 0 and validate it */
306 if ((blk_dread(dev_desc, 0, 1, (ulong *)legacymbr) != 1)
307 || (is_pmbr_valid(legacymbr) != 1)) {
314 * set_protective_mbr(): Set the EFI protective MBR
315 * @param dev_desc - block device descriptor
317 * @return - zero on success, otherwise error
319 static int set_protective_mbr(struct blk_desc *dev_desc)
321 /* Setup the Protective MBR */
322 ALLOC_CACHE_ALIGN_BUFFER(legacy_mbr, p_mbr, 1);
323 memset(p_mbr, 0, sizeof(*p_mbr));
326 printf("%s: calloc failed!\n", __func__);
330 /* Read MBR to backup boot code if it exists */
331 if (blk_dread(dev_desc, 0, 1, p_mbr) != 1) {
332 error("** Can't read from device %d **\n", dev_desc->devnum);
336 /* Append signature */
337 p_mbr->signature = MSDOS_MBR_SIGNATURE;
338 p_mbr->partition_record[0].sys_ind = EFI_PMBR_OSTYPE_EFI_GPT;
339 p_mbr->partition_record[0].start_sect = 1;
340 p_mbr->partition_record[0].nr_sects = (u32) dev_desc->lba - 1;
342 /* Write MBR sector to the MMC device */
343 if (blk_dwrite(dev_desc, 0, 1, p_mbr) != 1) {
344 printf("** Can't write to device %d **\n",
352 int write_gpt_table(struct blk_desc *dev_desc,
353 gpt_header *gpt_h, gpt_entry *gpt_e)
355 const int pte_blk_cnt = BLOCK_CNT((gpt_h->num_partition_entries
356 * sizeof(gpt_entry)), dev_desc);
359 debug("max lba: %x\n", (u32) dev_desc->lba);
360 /* Setup the Protective MBR */
361 if (set_protective_mbr(dev_desc) < 0)
364 /* Generate CRC for the Primary GPT Header */
365 calc_crc32 = efi_crc32((const unsigned char *)gpt_e,
366 le32_to_cpu(gpt_h->num_partition_entries) *
367 le32_to_cpu(gpt_h->sizeof_partition_entry));
368 gpt_h->partition_entry_array_crc32 = cpu_to_le32(calc_crc32);
370 calc_crc32 = efi_crc32((const unsigned char *)gpt_h,
371 le32_to_cpu(gpt_h->header_size));
372 gpt_h->header_crc32 = cpu_to_le32(calc_crc32);
374 /* Write the First GPT to the block right after the Legacy MBR */
375 if (blk_dwrite(dev_desc, 1, 1, gpt_h) != 1)
378 if (blk_dwrite(dev_desc, le64_to_cpu(gpt_h->partition_entry_lba),
379 pte_blk_cnt, gpt_e) != pte_blk_cnt)
382 prepare_backup_gpt_header(gpt_h);
384 if (blk_dwrite(dev_desc, (lbaint_t)le64_to_cpu(gpt_h->last_usable_lba)
385 + 1, pte_blk_cnt, gpt_e) != pte_blk_cnt)
388 if (blk_dwrite(dev_desc, (lbaint_t)le64_to_cpu(gpt_h->my_lba), 1,
392 debug("GPT successfully written to block device!\n");
396 printf("** Can't write to device %d **\n", dev_desc->devnum);
400 int gpt_fill_pte(gpt_header *gpt_h, gpt_entry *gpt_e,
401 disk_partition_t *partitions, int parts)
403 lbaint_t offset = (lbaint_t)le64_to_cpu(gpt_h->first_usable_lba);
405 lbaint_t last_usable_lba = (lbaint_t)
406 le64_to_cpu(gpt_h->last_usable_lba);
408 size_t efiname_len, dosname_len;
409 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
411 unsigned char *bin_uuid;
413 #ifdef CONFIG_PARTITION_TYPE_GUID
415 unsigned char *bin_type_guid;
418 for (i = 0; i < parts; i++) {
419 /* partition starting lba */
420 start = partitions[i].start;
421 if (start && (start < offset)) {
422 printf("Partition overlap\n");
426 gpt_e[i].starting_lba = cpu_to_le64(start);
427 offset = start + partitions[i].size;
429 gpt_e[i].starting_lba = cpu_to_le64(offset);
430 offset += partitions[i].size;
432 if (offset > (last_usable_lba + 1)) {
433 printf("Partitions layout exceds disk size\n");
436 /* partition ending lba */
437 if ((i == parts - 1) && (partitions[i].size == 0))
438 /* extend the last partition to maximuim */
439 gpt_e[i].ending_lba = gpt_h->last_usable_lba;
441 gpt_e[i].ending_lba = cpu_to_le64(offset - 1);
443 #ifdef CONFIG_PARTITION_TYPE_GUID
444 str_type_guid = partitions[i].type_guid;
445 bin_type_guid = gpt_e[i].partition_type_guid.b;
446 if (strlen(str_type_guid)) {
447 if (uuid_str_to_bin(str_type_guid, bin_type_guid,
448 UUID_STR_FORMAT_GUID)) {
449 printf("Partition no. %d: invalid type guid: %s\n",
454 /* default partition type GUID */
455 memcpy(bin_type_guid,
456 &PARTITION_BASIC_DATA_GUID, 16);
459 /* partition type GUID */
460 memcpy(gpt_e[i].partition_type_guid.b,
461 &PARTITION_BASIC_DATA_GUID, 16);
464 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
465 str_uuid = partitions[i].uuid;
466 bin_uuid = gpt_e[i].unique_partition_guid.b;
468 if (uuid_str_to_bin(str_uuid, bin_uuid, UUID_STR_FORMAT_GUID)) {
469 printf("Partition no. %d: invalid guid: %s\n",
475 /* partition attributes */
476 memset(&gpt_e[i].attributes, 0,
477 sizeof(gpt_entry_attributes));
479 if (partitions[i].bootable)
480 gpt_e[i].attributes.fields.legacy_bios_bootable = 1;
483 efiname_len = sizeof(gpt_e[i].partition_name)
484 / sizeof(efi_char16_t);
485 dosname_len = sizeof(partitions[i].name);
487 memset(gpt_e[i].partition_name, 0,
488 sizeof(gpt_e[i].partition_name));
490 for (k = 0; k < min(dosname_len, efiname_len); k++)
491 gpt_e[i].partition_name[k] =
492 (efi_char16_t)(partitions[i].name[k]);
494 debug("%s: name: %s offset[%d]: 0x" LBAF
495 " size[%d]: 0x" LBAF "\n",
496 __func__, partitions[i].name, i,
497 offset, i, partitions[i].size);
503 static uint32_t partition_entries_offset(struct blk_desc *dev_desc)
505 uint32_t offset_blks = 2;
506 int __maybe_unused config_offset;
508 #if defined(CONFIG_EFI_PARTITION_ENTRIES_OFF)
510 * Some architectures require their SPL loader at a fixed
511 * address within the first 16KB of the disk. To avoid an
512 * overlap with the partition entries of the EFI partition
513 * table, the first safe offset (in bytes, from the start of
514 * the disk) for the entries can be set in
515 * CONFIG_EFI_PARTITION_ENTRIES_OFF.
518 PAD_TO_BLOCKSIZE(CONFIG_EFI_PARTITION_ENTRIES_OFF, dev_desc);
521 #if defined(CONFIG_OF_CONTROL)
523 * Allow the offset of the first partition entires (in bytes
524 * from the start of the device) to be specified as a property
525 * of the device tree '/config' node.
527 config_offset = fdtdec_get_config_int(gd->fdt_blob,
528 "u-boot,efi-partition-entries-offset",
530 if (config_offset != -EINVAL)
531 offset_blks = PAD_TO_BLOCKSIZE(config_offset, dev_desc);
534 debug("efi: partition entries offset (in blocks): %d\n", offset_blks);
537 * The earliest LBA this can be at is LBA#2 (i.e. right behind
538 * the (protective) MBR and the GPT header.
546 int gpt_fill_header(struct blk_desc *dev_desc, gpt_header *gpt_h,
547 char *str_guid, int parts_count)
549 gpt_h->signature = cpu_to_le64(GPT_HEADER_SIGNATURE);
550 gpt_h->revision = cpu_to_le32(GPT_HEADER_REVISION_V1);
551 gpt_h->header_size = cpu_to_le32(sizeof(gpt_header));
552 gpt_h->my_lba = cpu_to_le64(1);
553 gpt_h->alternate_lba = cpu_to_le64(dev_desc->lba - 1);
554 gpt_h->last_usable_lba = cpu_to_le64(dev_desc->lba - 34);
555 gpt_h->partition_entry_lba =
556 cpu_to_le64(partition_entries_offset(dev_desc));
557 gpt_h->first_usable_lba =
558 cpu_to_le64(le64_to_cpu(gpt_h->partition_entry_lba) + 32);
559 gpt_h->num_partition_entries = cpu_to_le32(GPT_ENTRY_NUMBERS);
560 gpt_h->sizeof_partition_entry = cpu_to_le32(sizeof(gpt_entry));
561 gpt_h->header_crc32 = 0;
562 gpt_h->partition_entry_array_crc32 = 0;
564 if (uuid_str_to_bin(str_guid, gpt_h->disk_guid.b, UUID_STR_FORMAT_GUID))
570 int gpt_restore(struct blk_desc *dev_desc, char *str_disk_guid,
571 disk_partition_t *partitions, int parts_count)
575 gpt_header *gpt_h = calloc(1, PAD_TO_BLOCKSIZE(sizeof(gpt_header),
580 printf("%s: calloc failed!\n", __func__);
584 gpt_e = calloc(1, PAD_TO_BLOCKSIZE(GPT_ENTRY_NUMBERS
588 printf("%s: calloc failed!\n", __func__);
593 /* Generate Primary GPT header (LBA1) */
594 ret = gpt_fill_header(dev_desc, gpt_h, str_disk_guid, parts_count);
598 /* Generate partition entries */
599 ret = gpt_fill_pte(gpt_h, gpt_e, partitions, parts_count);
603 /* Write GPT partition table */
604 ret = write_gpt_table(dev_desc, gpt_h, gpt_e);
612 static void gpt_convert_efi_name_to_char(char *s, efi_char16_t *es, int n)
614 char *ess = (char *)es;
619 for (i = 0, j = 0; j < n; i += 2, j++) {
626 int gpt_verify_headers(struct blk_desc *dev_desc, gpt_header *gpt_head,
630 * This function validates AND
631 * fills in the GPT header and PTE
633 if (is_gpt_valid(dev_desc,
634 GPT_PRIMARY_PARTITION_TABLE_LBA,
635 gpt_head, gpt_pte) != 1) {
636 printf("%s: *** ERROR: Invalid GPT ***\n",
640 if (is_gpt_valid(dev_desc, (dev_desc->lba - 1),
641 gpt_head, gpt_pte) != 1) {
642 printf("%s: *** ERROR: Invalid Backup GPT ***\n",
650 int gpt_verify_partitions(struct blk_desc *dev_desc,
651 disk_partition_t *partitions, int parts,
652 gpt_header *gpt_head, gpt_entry **gpt_pte)
654 char efi_str[PARTNAME_SZ + 1];
659 ret = gpt_verify_headers(dev_desc, gpt_head, gpt_pte);
665 for (i = 0; i < parts; i++) {
666 if (i == gpt_head->num_partition_entries) {
667 error("More partitions than allowed!\n");
671 /* Check if GPT and ENV partition names match */
672 gpt_convert_efi_name_to_char(efi_str, gpt_e[i].partition_name,
675 debug("%s: part: %2d name - GPT: %16s, ENV: %16s ",
676 __func__, i, efi_str, partitions[i].name);
678 if (strncmp(efi_str, (char *)partitions[i].name,
679 sizeof(partitions->name))) {
680 error("Partition name: %s does not match %s!\n",
681 efi_str, (char *)partitions[i].name);
685 /* Check if GPT and ENV sizes match */
686 gpt_part_size = le64_to_cpu(gpt_e[i].ending_lba) -
687 le64_to_cpu(gpt_e[i].starting_lba) + 1;
688 debug("size(LBA) - GPT: %8llu, ENV: %8llu ",
689 (unsigned long long)gpt_part_size,
690 (unsigned long long)partitions[i].size);
692 if (le64_to_cpu(gpt_part_size) != partitions[i].size) {
693 /* We do not check the extend partition size */
694 if ((i == parts - 1) && (partitions[i].size == 0))
697 error("Partition %s size: %llu does not match %llu!\n",
698 efi_str, (unsigned long long)gpt_part_size,
699 (unsigned long long)partitions[i].size);
704 * Start address is optional - check only if provided
705 * in '$partition' variable
707 if (!partitions[i].start) {
712 /* Check if GPT and ENV start LBAs match */
713 debug("start LBA - GPT: %8llu, ENV: %8llu\n",
714 le64_to_cpu(gpt_e[i].starting_lba),
715 (unsigned long long)partitions[i].start);
717 if (le64_to_cpu(gpt_e[i].starting_lba) != partitions[i].start) {
718 error("Partition %s start: %llu does not match %llu!\n",
719 efi_str, le64_to_cpu(gpt_e[i].starting_lba),
720 (unsigned long long)partitions[i].start);
728 int is_valid_gpt_buf(struct blk_desc *dev_desc, void *buf)
733 /* determine start of GPT Header in the buffer */
734 gpt_h = buf + (GPT_PRIMARY_PARTITION_TABLE_LBA *
736 if (validate_gpt_header(gpt_h, GPT_PRIMARY_PARTITION_TABLE_LBA,
740 /* determine start of GPT Entries in the buffer */
741 gpt_e = buf + (le64_to_cpu(gpt_h->partition_entry_lba) *
743 if (validate_gpt_entries(gpt_h, gpt_e))
749 int write_mbr_and_gpt_partitions(struct blk_desc *dev_desc, void *buf)
757 if (is_valid_gpt_buf(dev_desc, buf))
760 /* determine start of GPT Header in the buffer */
761 gpt_h = buf + (GPT_PRIMARY_PARTITION_TABLE_LBA *
764 /* determine start of GPT Entries in the buffer */
765 gpt_e = buf + (le64_to_cpu(gpt_h->partition_entry_lba) *
767 gpt_e_blk_cnt = BLOCK_CNT((le32_to_cpu(gpt_h->num_partition_entries) *
768 le32_to_cpu(gpt_h->sizeof_partition_entry)),
772 lba = 0; /* MBR is always at 0 */
773 cnt = 1; /* MBR (1 block) */
774 if (blk_dwrite(dev_desc, lba, cnt, buf) != cnt) {
775 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n",
776 __func__, "MBR", cnt, lba);
780 /* write Primary GPT */
781 lba = GPT_PRIMARY_PARTITION_TABLE_LBA;
782 cnt = 1; /* GPT Header (1 block) */
783 if (blk_dwrite(dev_desc, lba, cnt, gpt_h) != cnt) {
784 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n",
785 __func__, "Primary GPT Header", cnt, lba);
789 lba = le64_to_cpu(gpt_h->partition_entry_lba);
791 if (blk_dwrite(dev_desc, lba, cnt, gpt_e) != cnt) {
792 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n",
793 __func__, "Primary GPT Entries", cnt, lba);
797 prepare_backup_gpt_header(gpt_h);
799 /* write Backup GPT */
800 lba = le64_to_cpu(gpt_h->partition_entry_lba);
802 if (blk_dwrite(dev_desc, lba, cnt, gpt_e) != cnt) {
803 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n",
804 __func__, "Backup GPT Entries", cnt, lba);
808 lba = le64_to_cpu(gpt_h->my_lba);
809 cnt = 1; /* GPT Header (1 block) */
810 if (blk_dwrite(dev_desc, lba, cnt, gpt_h) != cnt) {
811 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n",
812 __func__, "Backup GPT Header", cnt, lba);
824 * pmbr_part_valid(): Check for EFI partition signature
826 * Returns: 1 if EFI GPT partition type is found.
828 static int pmbr_part_valid(struct partition *part)
830 if (part->sys_ind == EFI_PMBR_OSTYPE_EFI_GPT &&
831 get_unaligned_le32(&part->start_sect) == 1UL) {
839 * is_pmbr_valid(): test Protective MBR for validity
841 * Returns: 1 if PMBR is valid, 0 otherwise.
842 * Validity depends on two things:
843 * 1) MSDOS signature is in the last two bytes of the MBR
844 * 2) One partition of type 0xEE is found, checked by pmbr_part_valid()
846 static int is_pmbr_valid(legacy_mbr * mbr)
850 if (!mbr || le16_to_cpu(mbr->signature) != MSDOS_MBR_SIGNATURE)
853 for (i = 0; i < 4; i++) {
854 if (pmbr_part_valid(&mbr->partition_record[i])) {
862 * is_gpt_valid() - tests one GPT header and PTEs for validity
864 * lba is the logical block address of the GPT header to test
865 * gpt is a GPT header ptr, filled on return.
866 * ptes is a PTEs ptr, filled on return.
868 * Description: returns 1 if valid, 0 on error.
869 * If valid, returns pointers to PTEs.
871 static int is_gpt_valid(struct blk_desc *dev_desc, u64 lba,
872 gpt_header *pgpt_head, gpt_entry **pgpt_pte)
874 if (!dev_desc || !pgpt_head) {
875 printf("%s: Invalid Argument(s)\n", __func__);
879 /* Read GPT Header from device */
880 if (blk_dread(dev_desc, (lbaint_t)lba, 1, pgpt_head) != 1) {
881 printf("*** ERROR: Can't read GPT header ***\n");
885 if (validate_gpt_header(pgpt_head, (lbaint_t)lba, dev_desc->lba))
888 /* Read and allocate Partition Table Entries */
889 *pgpt_pte = alloc_read_gpt_entries(dev_desc, pgpt_head);
890 if (*pgpt_pte == NULL) {
891 printf("GPT: Failed to allocate memory for PTE\n");
895 if (validate_gpt_entries(pgpt_head, *pgpt_pte)) {
900 /* We're done, all's well */
905 * alloc_read_gpt_entries(): reads partition entries from disk
909 * Description: Returns ptes on success, NULL on error.
910 * Allocates space for PTEs based on information found in @gpt.
911 * Notes: remember to free pte when you're done!
913 static gpt_entry *alloc_read_gpt_entries(struct blk_desc *dev_desc,
914 gpt_header *pgpt_head)
916 size_t count = 0, blk_cnt;
918 gpt_entry *pte = NULL;
920 if (!dev_desc || !pgpt_head) {
921 printf("%s: Invalid Argument(s)\n", __func__);
925 count = le32_to_cpu(pgpt_head->num_partition_entries) *
926 le32_to_cpu(pgpt_head->sizeof_partition_entry);
928 debug("%s: count = %u * %u = %lu\n", __func__,
929 (u32) le32_to_cpu(pgpt_head->num_partition_entries),
930 (u32) le32_to_cpu(pgpt_head->sizeof_partition_entry),
933 /* Allocate memory for PTE, remember to FREE */
935 pte = memalign(ARCH_DMA_MINALIGN,
936 PAD_TO_BLOCKSIZE(count, dev_desc));
939 if (count == 0 || pte == NULL) {
940 printf("%s: ERROR: Can't allocate %#lX bytes for GPT Entries\n",
941 __func__, (ulong)count);
945 /* Read GPT Entries from device */
946 blk = le64_to_cpu(pgpt_head->partition_entry_lba);
947 blk_cnt = BLOCK_CNT(count, dev_desc);
948 if (blk_dread(dev_desc, blk, (lbaint_t)blk_cnt, pte) != blk_cnt) {
949 printf("*** ERROR: Can't read GPT Entries ***\n");
957 * is_pte_valid(): validates a single Partition Table Entry
958 * @gpt_entry - Pointer to a single Partition Table Entry
960 * Description: returns 1 if valid, 0 on error.
962 static int is_pte_valid(gpt_entry * pte)
964 efi_guid_t unused_guid;
967 printf("%s: Invalid Argument(s)\n", __func__);
971 /* Only one validation for now:
972 * The GUID Partition Type != Unused Entry (ALL-ZERO)
974 memset(unused_guid.b, 0, sizeof(unused_guid.b));
976 if (memcmp(pte->partition_type_guid.b, unused_guid.b,
977 sizeof(unused_guid.b)) == 0) {
979 debug("%s: Found an unused PTE GUID at 0x%08X\n", __func__,
980 (unsigned int)(uintptr_t)pte);
989 * Add an 'a_' prefix so it comes before 'dos' in the linker list. We need to
990 * check EFI first, since a DOS partition is often used as a 'protective MBR'
993 U_BOOT_PART_TYPE(a_efi) = {
995 .part_type = PART_TYPE_EFI,
996 .max_entries = GPT_ENTRY_NUMBERS,
997 .get_info = part_get_info_ptr(part_get_info_efi),
998 .print = part_print_ptr(part_print_efi),
999 .test = part_test_efi,