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>
21 #include <linux/ctype.h>
23 DECLARE_GLOBAL_DATA_PTR
;
25 #ifdef HAVE_BLOCK_DEVICE
27 * efi_crc32() - EFI version of crc32 function
28 * @buf: buffer to calculate crc32 of
29 * @len - length of buf
31 * Description: Returns EFI-style CRC32 value for @buf
33 static inline u32
efi_crc32(const void *buf
, u32 len
)
35 return crc32(0, buf
, len
);
39 * Private function prototypes
42 static int pmbr_part_valid(struct partition
*part
);
43 static int is_pmbr_valid(legacy_mbr
* mbr
);
44 static int is_gpt_valid(block_dev_desc_t
*dev_desc
, u64 lba
,
45 gpt_header
*pgpt_head
, gpt_entry
**pgpt_pte
);
46 static gpt_entry
*alloc_read_gpt_entries(block_dev_desc_t
* dev_desc
,
47 gpt_header
* pgpt_head
);
48 static int is_pte_valid(gpt_entry
* pte
);
50 static char *print_efiname(gpt_entry
*pte
)
52 static char name
[PARTNAME_SZ
+ 1];
54 for (i
= 0; i
< PARTNAME_SZ
; i
++) {
56 c
= pte
->partition_name
[i
] & 0xff;
57 c
= (c
&& !isprint(c
)) ? '.' : c
;
60 name
[PARTNAME_SZ
] = 0;
64 static efi_guid_t system_guid
= PARTITION_SYSTEM_GUID
;
66 static inline int is_bootable(gpt_entry
*p
)
68 return p
->attributes
.fields
.legacy_bios_bootable
||
69 !memcmp(&(p
->partition_type_guid
), &system_guid
,
73 static int validate_gpt_header(gpt_header
*gpt_h
, lbaint_t lba
,
76 uint32_t crc32_backup
= 0;
79 /* Check the GPT header signature */
80 if (le64_to_cpu(gpt_h
->signature
) != GPT_HEADER_SIGNATURE
) {
81 printf("%s signature is wrong: 0x%llX != 0x%llX\n",
82 "GUID Partition Table Header",
83 le64_to_cpu(gpt_h
->signature
),
84 GPT_HEADER_SIGNATURE
);
88 /* Check the GUID Partition Table CRC */
89 memcpy(&crc32_backup
, &gpt_h
->header_crc32
, sizeof(crc32_backup
));
90 memset(&gpt_h
->header_crc32
, 0, sizeof(gpt_h
->header_crc32
));
92 calc_crc32
= efi_crc32((const unsigned char *)gpt_h
,
93 le32_to_cpu(gpt_h
->header_size
));
95 memcpy(&gpt_h
->header_crc32
, &crc32_backup
, sizeof(crc32_backup
));
97 if (calc_crc32
!= le32_to_cpu(crc32_backup
)) {
98 printf("%s CRC is wrong: 0x%x != 0x%x\n",
99 "GUID Partition Table Header",
100 le32_to_cpu(crc32_backup
), calc_crc32
);
105 * Check that the my_lba entry points to the LBA that contains the GPT
107 if (le64_to_cpu(gpt_h
->my_lba
) != lba
) {
108 printf("GPT: my_lba incorrect: %llX != " LBAF
"\n",
109 le64_to_cpu(gpt_h
->my_lba
),
115 * Check that the first_usable_lba and that the last_usable_lba are
118 if (le64_to_cpu(gpt_h
->first_usable_lba
) > lastlba
) {
119 printf("GPT: first_usable_lba incorrect: %llX > " LBAF
"\n",
120 le64_to_cpu(gpt_h
->first_usable_lba
), lastlba
);
123 if (le64_to_cpu(gpt_h
->last_usable_lba
) > lastlba
) {
124 printf("GPT: last_usable_lba incorrect: %llX > " LBAF
"\n",
125 le64_to_cpu(gpt_h
->last_usable_lba
), lastlba
);
129 debug("GPT: first_usable_lba: %llX last_usable_lba: %llX last lba: "
130 LBAF
"\n", le64_to_cpu(gpt_h
->first_usable_lba
),
131 le64_to_cpu(gpt_h
->last_usable_lba
), lastlba
);
136 static int validate_gpt_entries(gpt_header
*gpt_h
, gpt_entry
*gpt_e
)
140 /* Check the GUID Partition Table Entry Array CRC */
141 calc_crc32
= efi_crc32((const unsigned char *)gpt_e
,
142 le32_to_cpu(gpt_h
->num_partition_entries
) *
143 le32_to_cpu(gpt_h
->sizeof_partition_entry
));
145 if (calc_crc32
!= le32_to_cpu(gpt_h
->partition_entry_array_crc32
)) {
146 printf("%s: 0x%x != 0x%x\n",
147 "GUID Partition Table Entry Array CRC is wrong",
148 le32_to_cpu(gpt_h
->partition_entry_array_crc32
),
156 static void prepare_backup_gpt_header(gpt_header
*gpt_h
)
161 /* recalculate the values for the Backup GPT Header */
162 val
= le64_to_cpu(gpt_h
->my_lba
);
163 gpt_h
->my_lba
= gpt_h
->alternate_lba
;
164 gpt_h
->alternate_lba
= cpu_to_le64(val
);
165 gpt_h
->partition_entry_lba
=
166 cpu_to_le64(le64_to_cpu(gpt_h
->last_usable_lba
) + 1);
167 gpt_h
->header_crc32
= 0;
169 calc_crc32
= efi_crc32((const unsigned char *)gpt_h
,
170 le32_to_cpu(gpt_h
->header_size
));
171 gpt_h
->header_crc32
= cpu_to_le32(calc_crc32
);
174 #ifdef CONFIG_EFI_PARTITION
176 * Public Functions (include/part.h)
179 void print_part_efi(block_dev_desc_t
* dev_desc
)
181 ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header
, gpt_head
, 1, dev_desc
->blksz
);
182 gpt_entry
*gpt_pte
= NULL
;
185 unsigned char *uuid_bin
;
188 printf("%s: Invalid Argument(s)\n", __func__
);
191 /* This function validates AND fills in the GPT header and PTE */
192 if (is_gpt_valid(dev_desc
, GPT_PRIMARY_PARTITION_TABLE_LBA
,
193 gpt_head
, &gpt_pte
) != 1) {
194 printf("%s: *** ERROR: Invalid GPT ***\n", __func__
);
195 if (is_gpt_valid(dev_desc
, (dev_desc
->lba
- 1),
196 gpt_head
, &gpt_pte
) != 1) {
197 printf("%s: *** ERROR: Invalid Backup GPT ***\n",
201 printf("%s: *** Using Backup GPT ***\n",
206 debug("%s: gpt-entry at %p\n", __func__
, gpt_pte
);
208 printf("Part\tStart LBA\tEnd LBA\t\tName\n");
209 printf("\tAttributes\n");
210 printf("\tType GUID\n");
211 printf("\tPartition GUID\n");
213 for (i
= 0; i
< le32_to_cpu(gpt_head
->num_partition_entries
); i
++) {
214 /* Stop at the first non valid PTE */
215 if (!is_pte_valid(&gpt_pte
[i
]))
218 printf("%3d\t0x%08llx\t0x%08llx\t\"%s\"\n", (i
+ 1),
219 le64_to_cpu(gpt_pte
[i
].starting_lba
),
220 le64_to_cpu(gpt_pte
[i
].ending_lba
),
221 print_efiname(&gpt_pte
[i
]));
222 printf("\tattrs:\t0x%016llx\n", gpt_pte
[i
].attributes
.raw
);
223 uuid_bin
= (unsigned char *)gpt_pte
[i
].partition_type_guid
.b
;
224 uuid_bin_to_str(uuid_bin
, uuid
, UUID_STR_FORMAT_GUID
);
225 printf("\ttype:\t%s\n", uuid
);
226 #ifdef CONFIG_PARTITION_TYPE_GUID
227 if (!uuid_guid_get_str(uuid_bin
, uuid
))
228 printf("\ttype:\t%s\n", uuid
);
230 uuid_bin
= (unsigned char *)gpt_pte
[i
].unique_partition_guid
.b
;
231 uuid_bin_to_str(uuid_bin
, uuid
, UUID_STR_FORMAT_GUID
);
232 printf("\tguid:\t%s\n", uuid
);
235 /* Remember to free pte */
240 int get_partition_info_efi(block_dev_desc_t
* dev_desc
, int part
,
241 disk_partition_t
* info
)
243 ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header
, gpt_head
, 1, dev_desc
->blksz
);
244 gpt_entry
*gpt_pte
= NULL
;
246 /* "part" argument must be at least 1 */
247 if (!dev_desc
|| !info
|| part
< 1) {
248 printf("%s: Invalid Argument(s)\n", __func__
);
252 /* This function validates AND fills in the GPT header and PTE */
253 if (is_gpt_valid(dev_desc
, GPT_PRIMARY_PARTITION_TABLE_LBA
,
254 gpt_head
, &gpt_pte
) != 1) {
255 printf("%s: *** ERROR: Invalid GPT ***\n", __func__
);
256 if (is_gpt_valid(dev_desc
, (dev_desc
->lba
- 1),
257 gpt_head
, &gpt_pte
) != 1) {
258 printf("%s: *** ERROR: Invalid Backup GPT ***\n",
262 printf("%s: *** Using Backup GPT ***\n",
267 if (part
> le32_to_cpu(gpt_head
->num_partition_entries
) ||
268 !is_pte_valid(&gpt_pte
[part
- 1])) {
269 debug("%s: *** ERROR: Invalid partition number %d ***\n",
275 /* The 'lbaint_t' casting may limit the maximum disk size to 2 TB */
276 info
->start
= (lbaint_t
)le64_to_cpu(gpt_pte
[part
- 1].starting_lba
);
277 /* The ending LBA is inclusive, to calculate size, add 1 to it */
278 info
->size
= (lbaint_t
)le64_to_cpu(gpt_pte
[part
- 1].ending_lba
) + 1
280 info
->blksz
= dev_desc
->blksz
;
282 sprintf((char *)info
->name
, "%s",
283 print_efiname(&gpt_pte
[part
- 1]));
284 sprintf((char *)info
->type
, "U-Boot");
285 info
->bootable
= is_bootable(&gpt_pte
[part
- 1]);
286 #ifdef CONFIG_PARTITION_UUIDS
287 uuid_bin_to_str(gpt_pte
[part
- 1].unique_partition_guid
.b
, info
->uuid
,
288 UUID_STR_FORMAT_GUID
);
290 #ifdef CONFIG_PARTITION_TYPE_GUID
291 uuid_bin_to_str(gpt_pte
[part
- 1].partition_type_guid
.b
,
292 info
->type_guid
, UUID_STR_FORMAT_GUID
);
295 debug("%s: start 0x" LBAF
", size 0x" LBAF
", name %s\n", __func__
,
296 info
->start
, info
->size
, info
->name
);
298 /* Remember to free pte */
303 int get_partition_info_efi_by_name(block_dev_desc_t
*dev_desc
,
304 const char *name
, disk_partition_t
*info
)
308 for (i
= 1; i
< GPT_ENTRY_NUMBERS
; i
++) {
309 ret
= get_partition_info_efi(dev_desc
, i
, info
);
311 /* no more entries in table */
314 if (strcmp(name
, (const char *)info
->name
) == 0) {
322 int test_part_efi(block_dev_desc_t
* dev_desc
)
324 ALLOC_CACHE_ALIGN_BUFFER_PAD(legacy_mbr
, legacymbr
, 1, dev_desc
->blksz
);
326 /* Read legacy MBR from block 0 and validate it */
327 if ((dev_desc
->block_read(dev_desc
->dev
, 0, 1, (ulong
*)legacymbr
) != 1)
328 || (is_pmbr_valid(legacymbr
) != 1)) {
335 * set_protective_mbr(): Set the EFI protective MBR
336 * @param dev_desc - block device descriptor
338 * @return - zero on success, otherwise error
340 static int set_protective_mbr(block_dev_desc_t
*dev_desc
)
342 /* Setup the Protective MBR */
343 ALLOC_CACHE_ALIGN_BUFFER(legacy_mbr
, p_mbr
, 1);
344 memset(p_mbr
, 0, sizeof(*p_mbr
));
347 printf("%s: calloc failed!\n", __func__
);
350 /* Append signature */
351 p_mbr
->signature
= MSDOS_MBR_SIGNATURE
;
352 p_mbr
->partition_record
[0].sys_ind
= EFI_PMBR_OSTYPE_EFI_GPT
;
353 p_mbr
->partition_record
[0].start_sect
= 1;
354 p_mbr
->partition_record
[0].nr_sects
= (u32
) dev_desc
->lba
- 1;
356 /* Write MBR sector to the MMC device */
357 if (dev_desc
->block_write(dev_desc
->dev
, 0, 1, p_mbr
) != 1) {
358 printf("** Can't write to device %d **\n",
366 int write_gpt_table(block_dev_desc_t
*dev_desc
,
367 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
)), dev_desc
);
373 debug("max lba: %x\n", (u32
) dev_desc
->lba
);
374 /* Setup the Protective MBR */
375 if (set_protective_mbr(dev_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 (dev_desc
->block_write(dev_desc
->dev
, 1, 1, gpt_h
) != 1)
392 if (dev_desc
->block_write(dev_desc
->dev
, 2, pte_blk_cnt
, gpt_e
)
396 prepare_backup_gpt_header(gpt_h
);
398 if (dev_desc
->block_write(dev_desc
->dev
,
399 (lbaint_t
)le64_to_cpu(gpt_h
->last_usable_lba
)
401 pte_blk_cnt
, gpt_e
) != pte_blk_cnt
)
404 if (dev_desc
->block_write(dev_desc
->dev
,
405 (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
->dev
);
417 int gpt_fill_pte(gpt_header
*gpt_h
, gpt_entry
*gpt_e
,
418 disk_partition_t
*partitions
, int parts
)
420 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 #ifdef CONFIG_PARTITION_UUIDS
428 unsigned char *bin_uuid
;
430 #ifdef CONFIG_PARTITION_TYPE_GUID
432 unsigned char *bin_type_guid
;
435 for (i
= 0; i
< parts
; i
++) {
436 /* partition starting lba */
437 start
= partitions
[i
].start
;
438 if (start
&& (start
< offset
)) {
439 printf("Partition overlap\n");
443 gpt_e
[i
].starting_lba
= cpu_to_le64(start
);
444 offset
= start
+ partitions
[i
].size
;
446 gpt_e
[i
].starting_lba
= cpu_to_le64(offset
);
447 offset
+= partitions
[i
].size
;
449 if (offset
>= last_usable_lba
) {
450 printf("Partitions layout exceds disk size\n");
453 /* partition ending lba */
454 if ((i
== parts
- 1) && (partitions
[i
].size
== 0))
455 /* extend the last partition to maximuim */
456 gpt_e
[i
].ending_lba
= gpt_h
->last_usable_lba
;
458 gpt_e
[i
].ending_lba
= cpu_to_le64(offset
- 1);
460 #ifdef CONFIG_PARTITION_TYPE_GUID
461 str_type_guid
= partitions
[i
].type_guid
;
462 bin_type_guid
= gpt_e
[i
].partition_type_guid
.b
;
463 if (strlen(str_type_guid
)) {
464 if (uuid_str_to_bin(str_type_guid
, bin_type_guid
,
465 UUID_STR_FORMAT_GUID
)) {
466 printf("Partition no. %d: invalid type guid: %s\n",
471 /* default partition type GUID */
472 memcpy(bin_type_guid
,
473 &PARTITION_BASIC_DATA_GUID
, 16);
476 /* partition type GUID */
477 memcpy(gpt_e
[i
].partition_type_guid
.b
,
478 &PARTITION_BASIC_DATA_GUID
, 16);
481 #ifdef CONFIG_PARTITION_UUIDS
482 str_uuid
= partitions
[i
].uuid
;
483 bin_uuid
= gpt_e
[i
].unique_partition_guid
.b
;
485 if (uuid_str_to_bin(str_uuid
, bin_uuid
, UUID_STR_FORMAT_STD
)) {
486 printf("Partition no. %d: invalid guid: %s\n",
492 /* partition attributes */
493 memset(&gpt_e
[i
].attributes
, 0,
494 sizeof(gpt_entry_attributes
));
497 efiname_len
= sizeof(gpt_e
[i
].partition_name
)
498 / sizeof(efi_char16_t
);
499 dosname_len
= sizeof(partitions
[i
].name
);
501 memset(gpt_e
[i
].partition_name
, 0,
502 sizeof(gpt_e
[i
].partition_name
));
504 for (k
= 0; k
< min(dosname_len
, efiname_len
); k
++)
505 gpt_e
[i
].partition_name
[k
] =
506 (efi_char16_t
)(partitions
[i
].name
[k
]);
508 debug("%s: name: %s offset[%d]: 0x" LBAF
509 " size[%d]: 0x" LBAF
"\n",
510 __func__
, partitions
[i
].name
, i
,
511 offset
, i
, partitions
[i
].size
);
517 int gpt_fill_header(block_dev_desc_t
*dev_desc
, gpt_header
*gpt_h
,
518 char *str_guid
, int parts_count
)
520 gpt_h
->signature
= cpu_to_le64(GPT_HEADER_SIGNATURE
);
521 gpt_h
->revision
= cpu_to_le32(GPT_HEADER_REVISION_V1
);
522 gpt_h
->header_size
= cpu_to_le32(sizeof(gpt_header
));
523 gpt_h
->my_lba
= cpu_to_le64(1);
524 gpt_h
->alternate_lba
= cpu_to_le64(dev_desc
->lba
- 1);
525 gpt_h
->first_usable_lba
= cpu_to_le64(34);
526 gpt_h
->last_usable_lba
= cpu_to_le64(dev_desc
->lba
- 34);
527 gpt_h
->partition_entry_lba
= cpu_to_le64(2);
528 gpt_h
->num_partition_entries
= cpu_to_le32(GPT_ENTRY_NUMBERS
);
529 gpt_h
->sizeof_partition_entry
= cpu_to_le32(sizeof(gpt_entry
));
530 gpt_h
->header_crc32
= 0;
531 gpt_h
->partition_entry_array_crc32
= 0;
533 if (uuid_str_to_bin(str_guid
, gpt_h
->disk_guid
.b
, UUID_STR_FORMAT_GUID
))
539 int gpt_restore(block_dev_desc_t
*dev_desc
, char *str_disk_guid
,
540 disk_partition_t
*partitions
, int parts_count
)
544 gpt_header
*gpt_h
= calloc(1, PAD_TO_BLOCKSIZE(sizeof(gpt_header
),
549 printf("%s: calloc failed!\n", __func__
);
553 gpt_e
= calloc(1, PAD_TO_BLOCKSIZE(GPT_ENTRY_NUMBERS
557 printf("%s: calloc failed!\n", __func__
);
562 /* Generate Primary GPT header (LBA1) */
563 ret
= gpt_fill_header(dev_desc
, gpt_h
, str_disk_guid
, parts_count
);
567 /* Generate partition entries */
568 ret
= gpt_fill_pte(gpt_h
, gpt_e
, partitions
, parts_count
);
572 /* Write GPT partition table */
573 ret
= write_gpt_table(dev_desc
, gpt_h
, gpt_e
);
581 static void gpt_convert_efi_name_to_char(char *s
, efi_char16_t
*es
, int n
)
583 char *ess
= (char *)es
;
588 for (i
= 0, j
= 0; j
< n
; i
+= 2, j
++) {
595 int gpt_verify_headers(block_dev_desc_t
*dev_desc
, gpt_header
*gpt_head
,
599 * This function validates AND
600 * fills in the GPT header and PTE
602 if (is_gpt_valid(dev_desc
,
603 GPT_PRIMARY_PARTITION_TABLE_LBA
,
604 gpt_head
, gpt_pte
) != 1) {
605 printf("%s: *** ERROR: Invalid GPT ***\n",
609 if (is_gpt_valid(dev_desc
, (dev_desc
->lba
- 1),
610 gpt_head
, gpt_pte
) != 1) {
611 printf("%s: *** ERROR: Invalid Backup GPT ***\n",
619 int gpt_verify_partitions(block_dev_desc_t
*dev_desc
,
620 disk_partition_t
*partitions
, int parts
,
621 gpt_header
*gpt_head
, gpt_entry
**gpt_pte
)
623 char efi_str
[PARTNAME_SZ
+ 1];
628 ret
= gpt_verify_headers(dev_desc
, gpt_head
, gpt_pte
);
634 for (i
= 0; i
< parts
; i
++) {
635 if (i
== gpt_head
->num_partition_entries
) {
636 error("More partitions than allowed!\n");
640 /* Check if GPT and ENV partition names match */
641 gpt_convert_efi_name_to_char(efi_str
, gpt_e
[i
].partition_name
,
644 debug("%s: part: %2d name - GPT: %16s, ENV: %16s ",
645 __func__
, i
, efi_str
, partitions
[i
].name
);
647 if (strncmp(efi_str
, (char *)partitions
[i
].name
,
648 sizeof(partitions
->name
))) {
649 error("Partition name: %s does not match %s!\n",
650 efi_str
, (char *)partitions
[i
].name
);
654 /* Check if GPT and ENV sizes match */
655 gpt_part_size
= le64_to_cpu(gpt_e
[i
].ending_lba
) -
656 le64_to_cpu(gpt_e
[i
].starting_lba
) + 1;
657 debug("size(LBA) - GPT: %8llu, ENV: %8llu ",
658 gpt_part_size
, (u64
) partitions
[i
].size
);
660 if (le64_to_cpu(gpt_part_size
) != partitions
[i
].size
) {
661 error("Partition %s size: %llu does not match %llu!\n",
662 efi_str
, gpt_part_size
, (u64
) partitions
[i
].size
);
667 * Start address is optional - check only if provided
668 * in '$partition' variable
670 if (!partitions
[i
].start
) {
675 /* Check if GPT and ENV start LBAs match */
676 debug("start LBA - GPT: %8llu, ENV: %8llu\n",
677 le64_to_cpu(gpt_e
[i
].starting_lba
),
678 (u64
) partitions
[i
].start
);
680 if (le64_to_cpu(gpt_e
[i
].starting_lba
) != partitions
[i
].start
) {
681 error("Partition %s start: %llu does not match %llu!\n",
682 efi_str
, le64_to_cpu(gpt_e
[i
].starting_lba
),
683 (u64
) partitions
[i
].start
);
691 int is_valid_gpt_buf(block_dev_desc_t
*dev_desc
, void *buf
)
696 /* determine start of GPT Header in the buffer */
697 gpt_h
= buf
+ (GPT_PRIMARY_PARTITION_TABLE_LBA
*
699 if (validate_gpt_header(gpt_h
, GPT_PRIMARY_PARTITION_TABLE_LBA
,
703 /* determine start of GPT Entries in the buffer */
704 gpt_e
= buf
+ (le64_to_cpu(gpt_h
->partition_entry_lba
) *
706 if (validate_gpt_entries(gpt_h
, gpt_e
))
712 int write_mbr_and_gpt_partitions(block_dev_desc_t
*dev_desc
, void *buf
)
720 if (is_valid_gpt_buf(dev_desc
, buf
))
723 /* determine start of GPT Header in the buffer */
724 gpt_h
= buf
+ (GPT_PRIMARY_PARTITION_TABLE_LBA
*
727 /* determine start of GPT Entries in the buffer */
728 gpt_e
= buf
+ (le64_to_cpu(gpt_h
->partition_entry_lba
) *
730 gpt_e_blk_cnt
= BLOCK_CNT((le32_to_cpu(gpt_h
->num_partition_entries
) *
731 le32_to_cpu(gpt_h
->sizeof_partition_entry
)),
735 lba
= 0; /* MBR is always at 0 */
736 cnt
= 1; /* MBR (1 block) */
737 if (dev_desc
->block_write(dev_desc
->dev
, lba
, cnt
, buf
) != cnt
) {
738 printf("%s: failed writing '%s' (%d blks at 0x" LBAF
")\n",
739 __func__
, "MBR", cnt
, lba
);
743 /* write Primary GPT */
744 lba
= GPT_PRIMARY_PARTITION_TABLE_LBA
;
745 cnt
= 1; /* GPT Header (1 block) */
746 if (dev_desc
->block_write(dev_desc
->dev
, lba
, cnt
, gpt_h
) != cnt
) {
747 printf("%s: failed writing '%s' (%d blks at 0x" LBAF
")\n",
748 __func__
, "Primary GPT Header", cnt
, lba
);
752 lba
= le64_to_cpu(gpt_h
->partition_entry_lba
);
754 if (dev_desc
->block_write(dev_desc
->dev
, lba
, cnt
, gpt_e
) != cnt
) {
755 printf("%s: failed writing '%s' (%d blks at 0x" LBAF
")\n",
756 __func__
, "Primary GPT Entries", cnt
, lba
);
760 prepare_backup_gpt_header(gpt_h
);
762 /* write Backup GPT */
763 lba
= le64_to_cpu(gpt_h
->partition_entry_lba
);
765 if (dev_desc
->block_write(dev_desc
->dev
, lba
, cnt
, gpt_e
) != cnt
) {
766 printf("%s: failed writing '%s' (%d blks at 0x" LBAF
")\n",
767 __func__
, "Backup GPT Entries", cnt
, lba
);
771 lba
= le64_to_cpu(gpt_h
->my_lba
);
772 cnt
= 1; /* GPT Header (1 block) */
773 if (dev_desc
->block_write(dev_desc
->dev
, lba
, cnt
, gpt_h
) != cnt
) {
774 printf("%s: failed writing '%s' (%d blks at 0x" LBAF
")\n",
775 __func__
, "Backup GPT Header", cnt
, lba
);
787 * pmbr_part_valid(): Check for EFI partition signature
789 * Returns: 1 if EFI GPT partition type is found.
791 static int pmbr_part_valid(struct partition
*part
)
793 if (part
->sys_ind
== EFI_PMBR_OSTYPE_EFI_GPT
&&
794 get_unaligned_le32(&part
->start_sect
) == 1UL) {
802 * is_pmbr_valid(): test Protective MBR for validity
804 * Returns: 1 if PMBR is valid, 0 otherwise.
805 * Validity depends on two things:
806 * 1) MSDOS signature is in the last two bytes of the MBR
807 * 2) One partition of type 0xEE is found, checked by pmbr_part_valid()
809 static int is_pmbr_valid(legacy_mbr
* mbr
)
813 if (!mbr
|| le16_to_cpu(mbr
->signature
) != MSDOS_MBR_SIGNATURE
)
816 for (i
= 0; i
< 4; i
++) {
817 if (pmbr_part_valid(&mbr
->partition_record
[i
])) {
825 * is_gpt_valid() - tests one GPT header and PTEs for validity
827 * lba is the logical block address of the GPT header to test
828 * gpt is a GPT header ptr, filled on return.
829 * ptes is a PTEs ptr, filled on return.
831 * Description: returns 1 if valid, 0 on error.
832 * If valid, returns pointers to PTEs.
834 static int is_gpt_valid(block_dev_desc_t
*dev_desc
, u64 lba
,
835 gpt_header
*pgpt_head
, gpt_entry
**pgpt_pte
)
837 if (!dev_desc
|| !pgpt_head
) {
838 printf("%s: Invalid Argument(s)\n", __func__
);
842 /* Read GPT Header from device */
843 if (dev_desc
->block_read(dev_desc
->dev
, (lbaint_t
)lba
, 1, pgpt_head
)
845 printf("*** ERROR: Can't read GPT header ***\n");
849 if (validate_gpt_header(pgpt_head
, (lbaint_t
)lba
, dev_desc
->lba
))
852 /* Read and allocate Partition Table Entries */
853 *pgpt_pte
= alloc_read_gpt_entries(dev_desc
, pgpt_head
);
854 if (*pgpt_pte
== NULL
) {
855 printf("GPT: Failed to allocate memory for PTE\n");
859 if (validate_gpt_entries(pgpt_head
, *pgpt_pte
)) {
864 /* We're done, all's well */
869 * alloc_read_gpt_entries(): reads partition entries from disk
873 * Description: Returns ptes on success, NULL on error.
874 * Allocates space for PTEs based on information found in @gpt.
875 * Notes: remember to free pte when you're done!
877 static gpt_entry
*alloc_read_gpt_entries(block_dev_desc_t
* dev_desc
,
878 gpt_header
* pgpt_head
)
880 size_t count
= 0, blk_cnt
;
881 gpt_entry
*pte
= NULL
;
883 if (!dev_desc
|| !pgpt_head
) {
884 printf("%s: Invalid Argument(s)\n", __func__
);
888 count
= le32_to_cpu(pgpt_head
->num_partition_entries
) *
889 le32_to_cpu(pgpt_head
->sizeof_partition_entry
);
891 debug("%s: count = %u * %u = %zu\n", __func__
,
892 (u32
) le32_to_cpu(pgpt_head
->num_partition_entries
),
893 (u32
) le32_to_cpu(pgpt_head
->sizeof_partition_entry
), count
);
895 /* Allocate memory for PTE, remember to FREE */
897 pte
= memalign(ARCH_DMA_MINALIGN
,
898 PAD_TO_BLOCKSIZE(count
, dev_desc
));
901 if (count
== 0 || pte
== NULL
) {
902 printf("%s: ERROR: Can't allocate 0x%zX "
903 "bytes for GPT Entries\n",
908 /* Read GPT Entries from device */
909 blk_cnt
= BLOCK_CNT(count
, dev_desc
);
910 if (dev_desc
->block_read (dev_desc
->dev
,
911 (lbaint_t
)le64_to_cpu(pgpt_head
->partition_entry_lba
),
912 (lbaint_t
) (blk_cnt
), pte
)
915 printf("*** ERROR: Can't read GPT Entries ***\n");
923 * is_pte_valid(): validates a single Partition Table Entry
924 * @gpt_entry - Pointer to a single Partition Table Entry
926 * Description: returns 1 if valid, 0 on error.
928 static int is_pte_valid(gpt_entry
* pte
)
930 efi_guid_t unused_guid
;
933 printf("%s: Invalid Argument(s)\n", __func__
);
937 /* Only one validation for now:
938 * The GUID Partition Type != Unused Entry (ALL-ZERO)
940 memset(unused_guid
.b
, 0, sizeof(unused_guid
.b
));
942 if (memcmp(pte
->partition_type_guid
.b
, unused_guid
.b
,
943 sizeof(unused_guid
.b
)) == 0) {
945 debug("%s: Found an unused PTE GUID at 0x%08X\n", __func__
,
946 (unsigned int)(uintptr_t)pte
);