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 uuid_bin
= (unsigned char *)gpt_pte
[i
].unique_partition_guid
.b
;
227 uuid_bin_to_str(uuid_bin
, uuid
, UUID_STR_FORMAT_GUID
);
228 printf("\tguid:\t%s\n", uuid
);
231 /* Remember to free pte */
236 int get_partition_info_efi(block_dev_desc_t
* dev_desc
, int part
,
237 disk_partition_t
* info
)
239 ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header
, gpt_head
, 1, dev_desc
->blksz
);
240 gpt_entry
*gpt_pte
= NULL
;
242 /* "part" argument must be at least 1 */
243 if (!dev_desc
|| !info
|| part
< 1) {
244 printf("%s: Invalid Argument(s)\n", __func__
);
248 /* This function validates AND fills in the GPT header and PTE */
249 if (is_gpt_valid(dev_desc
, GPT_PRIMARY_PARTITION_TABLE_LBA
,
250 gpt_head
, &gpt_pte
) != 1) {
251 printf("%s: *** ERROR: Invalid GPT ***\n", __func__
);
252 if (is_gpt_valid(dev_desc
, (dev_desc
->lba
- 1),
253 gpt_head
, &gpt_pte
) != 1) {
254 printf("%s: *** ERROR: Invalid Backup GPT ***\n",
258 printf("%s: *** Using Backup GPT ***\n",
263 if (part
> le32_to_cpu(gpt_head
->num_partition_entries
) ||
264 !is_pte_valid(&gpt_pte
[part
- 1])) {
265 debug("%s: *** ERROR: Invalid partition number %d ***\n",
271 /* The 'lbaint_t' casting may limit the maximum disk size to 2 TB */
272 info
->start
= (lbaint_t
)le64_to_cpu(gpt_pte
[part
- 1].starting_lba
);
273 /* The ending LBA is inclusive, to calculate size, add 1 to it */
274 info
->size
= (lbaint_t
)le64_to_cpu(gpt_pte
[part
- 1].ending_lba
) + 1
276 info
->blksz
= dev_desc
->blksz
;
278 sprintf((char *)info
->name
, "%s",
279 print_efiname(&gpt_pte
[part
- 1]));
280 sprintf((char *)info
->type
, "U-Boot");
281 info
->bootable
= is_bootable(&gpt_pte
[part
- 1]);
282 #ifdef CONFIG_PARTITION_UUIDS
283 uuid_bin_to_str(gpt_pte
[part
- 1].unique_partition_guid
.b
, info
->uuid
,
284 UUID_STR_FORMAT_GUID
);
287 debug("%s: start 0x" LBAF
", size 0x" LBAF
", name %s\n", __func__
,
288 info
->start
, info
->size
, info
->name
);
290 /* Remember to free pte */
295 int get_partition_info_efi_by_name(block_dev_desc_t
*dev_desc
,
296 const char *name
, disk_partition_t
*info
)
300 for (i
= 1; i
< GPT_ENTRY_NUMBERS
; i
++) {
301 ret
= get_partition_info_efi(dev_desc
, i
, info
);
303 /* no more entries in table */
306 if (strcmp(name
, (const char *)info
->name
) == 0) {
314 int test_part_efi(block_dev_desc_t
* dev_desc
)
316 ALLOC_CACHE_ALIGN_BUFFER_PAD(legacy_mbr
, legacymbr
, 1, dev_desc
->blksz
);
318 /* Read legacy MBR from block 0 and validate it */
319 if ((dev_desc
->block_read(dev_desc
->dev
, 0, 1, (ulong
*)legacymbr
) != 1)
320 || (is_pmbr_valid(legacymbr
) != 1)) {
327 * set_protective_mbr(): Set the EFI protective MBR
328 * @param dev_desc - block device descriptor
330 * @return - zero on success, otherwise error
332 static int set_protective_mbr(block_dev_desc_t
*dev_desc
)
334 /* Setup the Protective MBR */
335 ALLOC_CACHE_ALIGN_BUFFER(legacy_mbr
, p_mbr
, 1);
336 memset(p_mbr
, 0, sizeof(*p_mbr
));
339 printf("%s: calloc failed!\n", __func__
);
342 /* Append signature */
343 p_mbr
->signature
= MSDOS_MBR_SIGNATURE
;
344 p_mbr
->partition_record
[0].sys_ind
= EFI_PMBR_OSTYPE_EFI_GPT
;
345 p_mbr
->partition_record
[0].start_sect
= 1;
346 p_mbr
->partition_record
[0].nr_sects
= (u32
) dev_desc
->lba
- 1;
348 /* Write MBR sector to the MMC device */
349 if (dev_desc
->block_write(dev_desc
->dev
, 0, 1, p_mbr
) != 1) {
350 printf("** Can't write to device %d **\n",
358 int write_gpt_table(block_dev_desc_t
*dev_desc
,
359 gpt_header
*gpt_h
, gpt_entry
*gpt_e
)
361 const int pte_blk_cnt
= BLOCK_CNT((gpt_h
->num_partition_entries
362 * sizeof(gpt_entry
)), dev_desc
);
365 debug("max lba: %x\n", (u32
) dev_desc
->lba
);
366 /* Setup the Protective MBR */
367 if (set_protective_mbr(dev_desc
) < 0)
370 /* Generate CRC for the Primary GPT Header */
371 calc_crc32
= efi_crc32((const unsigned char *)gpt_e
,
372 le32_to_cpu(gpt_h
->num_partition_entries
) *
373 le32_to_cpu(gpt_h
->sizeof_partition_entry
));
374 gpt_h
->partition_entry_array_crc32
= cpu_to_le32(calc_crc32
);
376 calc_crc32
= efi_crc32((const unsigned char *)gpt_h
,
377 le32_to_cpu(gpt_h
->header_size
));
378 gpt_h
->header_crc32
= cpu_to_le32(calc_crc32
);
380 /* Write the First GPT to the block right after the Legacy MBR */
381 if (dev_desc
->block_write(dev_desc
->dev
, 1, 1, gpt_h
) != 1)
384 if (dev_desc
->block_write(dev_desc
->dev
, 2, pte_blk_cnt
, gpt_e
)
388 prepare_backup_gpt_header(gpt_h
);
390 if (dev_desc
->block_write(dev_desc
->dev
,
391 (lbaint_t
)le64_to_cpu(gpt_h
->last_usable_lba
)
393 pte_blk_cnt
, gpt_e
) != pte_blk_cnt
)
396 if (dev_desc
->block_write(dev_desc
->dev
,
397 (lbaint_t
)le64_to_cpu(gpt_h
->my_lba
), 1,
401 debug("GPT successfully written to block device!\n");
405 printf("** Can't write to device %d **\n", dev_desc
->dev
);
409 int gpt_fill_pte(gpt_header
*gpt_h
, gpt_entry
*gpt_e
,
410 disk_partition_t
*partitions
, int parts
)
412 lbaint_t offset
= (lbaint_t
)le64_to_cpu(gpt_h
->first_usable_lba
);
414 lbaint_t last_usable_lba
= (lbaint_t
)
415 le64_to_cpu(gpt_h
->last_usable_lba
);
417 size_t efiname_len
, dosname_len
;
418 #ifdef CONFIG_PARTITION_UUIDS
420 unsigned char *bin_uuid
;
423 for (i
= 0; i
< parts
; i
++) {
424 /* partition starting lba */
425 start
= partitions
[i
].start
;
426 if (start
&& (start
< offset
)) {
427 printf("Partition overlap\n");
431 gpt_e
[i
].starting_lba
= cpu_to_le64(start
);
432 offset
= start
+ partitions
[i
].size
;
434 gpt_e
[i
].starting_lba
= cpu_to_le64(offset
);
435 offset
+= partitions
[i
].size
;
437 if (offset
>= last_usable_lba
) {
438 printf("Partitions layout exceds disk size\n");
441 /* partition ending lba */
442 if ((i
== parts
- 1) && (partitions
[i
].size
== 0))
443 /* extend the last partition to maximuim */
444 gpt_e
[i
].ending_lba
= gpt_h
->last_usable_lba
;
446 gpt_e
[i
].ending_lba
= cpu_to_le64(offset
- 1);
448 /* partition type GUID */
449 memcpy(gpt_e
[i
].partition_type_guid
.b
,
450 &PARTITION_BASIC_DATA_GUID
, 16);
452 #ifdef CONFIG_PARTITION_UUIDS
453 str_uuid
= partitions
[i
].uuid
;
454 bin_uuid
= gpt_e
[i
].unique_partition_guid
.b
;
456 if (uuid_str_to_bin(str_uuid
, bin_uuid
, UUID_STR_FORMAT_STD
)) {
457 printf("Partition no. %d: invalid guid: %s\n",
463 /* partition attributes */
464 memset(&gpt_e
[i
].attributes
, 0,
465 sizeof(gpt_entry_attributes
));
468 efiname_len
= sizeof(gpt_e
[i
].partition_name
)
469 / sizeof(efi_char16_t
);
470 dosname_len
= sizeof(partitions
[i
].name
);
472 memset(gpt_e
[i
].partition_name
, 0,
473 sizeof(gpt_e
[i
].partition_name
));
475 for (k
= 0; k
< min(dosname_len
, efiname_len
); k
++)
476 gpt_e
[i
].partition_name
[k
] =
477 (efi_char16_t
)(partitions
[i
].name
[k
]);
479 debug("%s: name: %s offset[%d]: 0x" LBAF
480 " size[%d]: 0x" LBAF
"\n",
481 __func__
, partitions
[i
].name
, i
,
482 offset
, i
, partitions
[i
].size
);
488 int gpt_fill_header(block_dev_desc_t
*dev_desc
, gpt_header
*gpt_h
,
489 char *str_guid
, int parts_count
)
491 gpt_h
->signature
= cpu_to_le64(GPT_HEADER_SIGNATURE
);
492 gpt_h
->revision
= cpu_to_le32(GPT_HEADER_REVISION_V1
);
493 gpt_h
->header_size
= cpu_to_le32(sizeof(gpt_header
));
494 gpt_h
->my_lba
= cpu_to_le64(1);
495 gpt_h
->alternate_lba
= cpu_to_le64(dev_desc
->lba
- 1);
496 gpt_h
->first_usable_lba
= cpu_to_le64(34);
497 gpt_h
->last_usable_lba
= cpu_to_le64(dev_desc
->lba
- 34);
498 gpt_h
->partition_entry_lba
= cpu_to_le64(2);
499 gpt_h
->num_partition_entries
= cpu_to_le32(GPT_ENTRY_NUMBERS
);
500 gpt_h
->sizeof_partition_entry
= cpu_to_le32(sizeof(gpt_entry
));
501 gpt_h
->header_crc32
= 0;
502 gpt_h
->partition_entry_array_crc32
= 0;
504 if (uuid_str_to_bin(str_guid
, gpt_h
->disk_guid
.b
, UUID_STR_FORMAT_GUID
))
510 int gpt_restore(block_dev_desc_t
*dev_desc
, char *str_disk_guid
,
511 disk_partition_t
*partitions
, int parts_count
)
515 gpt_header
*gpt_h
= calloc(1, PAD_TO_BLOCKSIZE(sizeof(gpt_header
),
520 printf("%s: calloc failed!\n", __func__
);
524 gpt_e
= calloc(1, PAD_TO_BLOCKSIZE(GPT_ENTRY_NUMBERS
528 printf("%s: calloc failed!\n", __func__
);
533 /* Generate Primary GPT header (LBA1) */
534 ret
= gpt_fill_header(dev_desc
, gpt_h
, str_disk_guid
, parts_count
);
538 /* Generate partition entries */
539 ret
= gpt_fill_pte(gpt_h
, gpt_e
, partitions
, parts_count
);
543 /* Write GPT partition table */
544 ret
= write_gpt_table(dev_desc
, gpt_h
, gpt_e
);
552 int is_valid_gpt_buf(block_dev_desc_t
*dev_desc
, void *buf
)
557 /* determine start of GPT Header in the buffer */
558 gpt_h
= buf
+ (GPT_PRIMARY_PARTITION_TABLE_LBA
*
560 if (validate_gpt_header(gpt_h
, GPT_PRIMARY_PARTITION_TABLE_LBA
,
564 /* determine start of GPT Entries in the buffer */
565 gpt_e
= buf
+ (le64_to_cpu(gpt_h
->partition_entry_lba
) *
567 if (validate_gpt_entries(gpt_h
, gpt_e
))
573 int write_mbr_and_gpt_partitions(block_dev_desc_t
*dev_desc
, void *buf
)
581 if (is_valid_gpt_buf(dev_desc
, buf
))
584 /* determine start of GPT Header in the buffer */
585 gpt_h
= buf
+ (GPT_PRIMARY_PARTITION_TABLE_LBA
*
588 /* determine start of GPT Entries in the buffer */
589 gpt_e
= buf
+ (le64_to_cpu(gpt_h
->partition_entry_lba
) *
591 gpt_e_blk_cnt
= BLOCK_CNT((le32_to_cpu(gpt_h
->num_partition_entries
) *
592 le32_to_cpu(gpt_h
->sizeof_partition_entry
)),
596 lba
= 0; /* MBR is always at 0 */
597 cnt
= 1; /* MBR (1 block) */
598 if (dev_desc
->block_write(dev_desc
->dev
, lba
, cnt
, buf
) != cnt
) {
599 printf("%s: failed writing '%s' (%d blks at 0x" LBAF
")\n",
600 __func__
, "MBR", cnt
, lba
);
604 /* write Primary GPT */
605 lba
= GPT_PRIMARY_PARTITION_TABLE_LBA
;
606 cnt
= 1; /* GPT Header (1 block) */
607 if (dev_desc
->block_write(dev_desc
->dev
, lba
, cnt
, gpt_h
) != cnt
) {
608 printf("%s: failed writing '%s' (%d blks at 0x" LBAF
")\n",
609 __func__
, "Primary GPT Header", cnt
, lba
);
613 lba
= le64_to_cpu(gpt_h
->partition_entry_lba
);
615 if (dev_desc
->block_write(dev_desc
->dev
, lba
, cnt
, gpt_e
) != cnt
) {
616 printf("%s: failed writing '%s' (%d blks at 0x" LBAF
")\n",
617 __func__
, "Primary GPT Entries", cnt
, lba
);
621 prepare_backup_gpt_header(gpt_h
);
623 /* write Backup GPT */
624 lba
= le64_to_cpu(gpt_h
->partition_entry_lba
);
626 if (dev_desc
->block_write(dev_desc
->dev
, lba
, cnt
, gpt_e
) != cnt
) {
627 printf("%s: failed writing '%s' (%d blks at 0x" LBAF
")\n",
628 __func__
, "Backup GPT Entries", cnt
, lba
);
632 lba
= le64_to_cpu(gpt_h
->my_lba
);
633 cnt
= 1; /* GPT Header (1 block) */
634 if (dev_desc
->block_write(dev_desc
->dev
, lba
, cnt
, gpt_h
) != cnt
) {
635 printf("%s: failed writing '%s' (%d blks at 0x" LBAF
")\n",
636 __func__
, "Backup GPT Header", cnt
, lba
);
648 * pmbr_part_valid(): Check for EFI partition signature
650 * Returns: 1 if EFI GPT partition type is found.
652 static int pmbr_part_valid(struct partition
*part
)
654 if (part
->sys_ind
== EFI_PMBR_OSTYPE_EFI_GPT
&&
655 get_unaligned_le32(&part
->start_sect
) == 1UL) {
663 * is_pmbr_valid(): test Protective MBR for validity
665 * Returns: 1 if PMBR is valid, 0 otherwise.
666 * Validity depends on two things:
667 * 1) MSDOS signature is in the last two bytes of the MBR
668 * 2) One partition of type 0xEE is found, checked by pmbr_part_valid()
670 static int is_pmbr_valid(legacy_mbr
* mbr
)
674 if (!mbr
|| le16_to_cpu(mbr
->signature
) != MSDOS_MBR_SIGNATURE
)
677 for (i
= 0; i
< 4; i
++) {
678 if (pmbr_part_valid(&mbr
->partition_record
[i
])) {
686 * is_gpt_valid() - tests one GPT header and PTEs for validity
688 * lba is the logical block address of the GPT header to test
689 * gpt is a GPT header ptr, filled on return.
690 * ptes is a PTEs ptr, filled on return.
692 * Description: returns 1 if valid, 0 on error.
693 * If valid, returns pointers to PTEs.
695 static int is_gpt_valid(block_dev_desc_t
*dev_desc
, u64 lba
,
696 gpt_header
*pgpt_head
, gpt_entry
**pgpt_pte
)
698 if (!dev_desc
|| !pgpt_head
) {
699 printf("%s: Invalid Argument(s)\n", __func__
);
703 /* Read GPT Header from device */
704 if (dev_desc
->block_read(dev_desc
->dev
, (lbaint_t
)lba
, 1, pgpt_head
)
706 printf("*** ERROR: Can't read GPT header ***\n");
710 if (validate_gpt_header(pgpt_head
, (lbaint_t
)lba
, dev_desc
->lba
))
713 /* Read and allocate Partition Table Entries */
714 *pgpt_pte
= alloc_read_gpt_entries(dev_desc
, pgpt_head
);
715 if (*pgpt_pte
== NULL
) {
716 printf("GPT: Failed to allocate memory for PTE\n");
720 if (validate_gpt_entries(pgpt_head
, *pgpt_pte
)) {
725 /* We're done, all's well */
730 * alloc_read_gpt_entries(): reads partition entries from disk
734 * Description: Returns ptes on success, NULL on error.
735 * Allocates space for PTEs based on information found in @gpt.
736 * Notes: remember to free pte when you're done!
738 static gpt_entry
*alloc_read_gpt_entries(block_dev_desc_t
* dev_desc
,
739 gpt_header
* pgpt_head
)
741 size_t count
= 0, blk_cnt
;
742 gpt_entry
*pte
= NULL
;
744 if (!dev_desc
|| !pgpt_head
) {
745 printf("%s: Invalid Argument(s)\n", __func__
);
749 count
= le32_to_cpu(pgpt_head
->num_partition_entries
) *
750 le32_to_cpu(pgpt_head
->sizeof_partition_entry
);
752 debug("%s: count = %u * %u = %zu\n", __func__
,
753 (u32
) le32_to_cpu(pgpt_head
->num_partition_entries
),
754 (u32
) le32_to_cpu(pgpt_head
->sizeof_partition_entry
), count
);
756 /* Allocate memory for PTE, remember to FREE */
758 pte
= memalign(ARCH_DMA_MINALIGN
,
759 PAD_TO_BLOCKSIZE(count
, dev_desc
));
762 if (count
== 0 || pte
== NULL
) {
763 printf("%s: ERROR: Can't allocate 0x%zX "
764 "bytes for GPT Entries\n",
769 /* Read GPT Entries from device */
770 blk_cnt
= BLOCK_CNT(count
, dev_desc
);
771 if (dev_desc
->block_read (dev_desc
->dev
,
772 (lbaint_t
)le64_to_cpu(pgpt_head
->partition_entry_lba
),
773 (lbaint_t
) (blk_cnt
), pte
)
776 printf("*** ERROR: Can't read GPT Entries ***\n");
784 * is_pte_valid(): validates a single Partition Table Entry
785 * @gpt_entry - Pointer to a single Partition Table Entry
787 * Description: returns 1 if valid, 0 on error.
789 static int is_pte_valid(gpt_entry
* pte
)
791 efi_guid_t unused_guid
;
794 printf("%s: Invalid Argument(s)\n", __func__
);
798 /* Only one validation for now:
799 * The GUID Partition Type != Unused Entry (ALL-ZERO)
801 memset(unused_guid
.b
, 0, sizeof(unused_guid
.b
));
803 if (memcmp(pte
->partition_type_guid
.b
, unused_guid
.b
,
804 sizeof(unused_guid
.b
)) == 0) {
806 debug("%s: Found an unused PTE GUID at 0x%08X\n", __func__
,
807 (unsigned int)(uintptr_t)pte
);