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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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12
disk/part_dos.c
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@@ -89,14 +89,20 @@ static int test_block_type(unsigned char *buffer)
static int part_test_dos(struct blk_desc *dev_desc)
{
ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
ALLOC_CACHE_ALIGN_BUFFER(legacy_mbr, mbr, dev_desc->blksz);
if (blk_dread(dev_desc, 0, 1, (ulong *)buffer) != 1)
if (blk_dread(dev_desc, 0, 1, (ulong *)mbr) != 1)
return -1;
if (test_block_type(buffer) != DOS_MBR)
if (test_block_type((unsigned char *)mbr) != DOS_MBR)
return -1;
if (dev_desc->sig_type == SIG_TYPE_NONE &&
mbr->unique_mbr_signature != 0) {
dev_desc->sig_type = SIG_TYPE_MBR;
dev_desc->mbr_sig = mbr->unique_mbr_signature;
}
return 0;
}