diff options
| author | Peter Jones <pjones@redhat.com> | 2017-09-13 18:05:25 -0400 |
|---|---|---|
| committer | Alexander Graf <agraf@suse.de> | 2017-09-20 10:20:19 +0200 |
| commit | ff98cb90514d9b787ddc097c203ac8db2941efe1 (patch) | |
| tree | 18c1894c6eb53cd60889d6044a87f9b1f81a8afe /disk/part_efi.c | |
| parent | 0d6ab32e3712fe7bc2e3aaf3d93e0d5910264df3 (diff) | |
part: extract MBR signature from partitions
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>
Diffstat (limited to 'disk/part_efi.c')
| -rw-r--r-- | disk/part_efi.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/disk/part_efi.c b/disk/part_efi.c index 2973d52f6a..208bb14ee8 100644 --- a/disk/part_efi.c +++ b/disk/part_efi.c @@ -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) { |