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part: extract MBR signature from partitions

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EFI client programs need the signature information from the partition
table to determine the disk a partition is on, so we need to fill that
in here.

Signed-off-by: Peter Jones <pjones@redhat.com>
[separated from efi_loader part, and fixed build-errors for non-
 CONFIG_EFI_PARTITION case]
Signed-off-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Peter Jones
2017-09-13 18:05:25 -04:00
committed by Alexander Graf
parent 0d6ab32e37
commit ff98cb9051
3 changed files with 47 additions and 3 deletions
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20
disk/part_efi.c
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@@ -923,11 +923,19 @@ static int is_pmbr_valid(legacy_mbr * mbr)
static int is_gpt_valid(struct blk_desc *dev_desc, u64 lba,
gpt_header *pgpt_head, gpt_entry **pgpt_pte)
{
ALLOC_CACHE_ALIGN_BUFFER(legacy_mbr, mbr, dev_desc->blksz);
if (!dev_desc || !pgpt_head) {
printf("%s: Invalid Argument(s)\n", __func__);
return 0;
}
/* Read MBR Header from device */
if (blk_dread(dev_desc, 0, 1, (ulong *)mbr) != 1) {
printf("*** ERROR: Can't read MBR header ***\n");
return 0;
}
/* Read GPT Header from device */
if (blk_dread(dev_desc, (lbaint_t)lba, 1, pgpt_head) != 1) {
printf("*** ERROR: Can't read GPT header ***\n");
@@ -937,6 +945,18 @@ static int is_gpt_valid(struct blk_desc *dev_desc, u64 lba,
if (validate_gpt_header(pgpt_head, (lbaint_t)lba, dev_desc->lba))
return 0;
if (dev_desc->sig_type == SIG_TYPE_NONE) {
efi_guid_t empty = {};
if (memcmp(&pgpt_head->disk_guid, &empty, sizeof(empty))) {
dev_desc->sig_type = SIG_TYPE_GUID;
memcpy(&dev_desc->guid_sig, &pgpt_head->disk_guid,
sizeof(empty));
} else if (mbr->unique_mbr_signature != 0) {
dev_desc->sig_type = SIG_TYPE_MBR;
dev_desc->mbr_sig = mbr->unique_mbr_signature;
}
}
/* Read and allocate Partition Table Entries */
*pgpt_pte = alloc_read_gpt_entries(dev_desc, pgpt_head);
if (*pgpt_pte == NULL) {