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disk: part_efi: add support for the Backup GPT

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Check the Backup GPT table if the Primary GPT table is invalid.
Renamed "Secondary GPT" to "Backup GPT" as per:
  UEFI Specification (Version 2.3.1, Errata A)

Signed-off-by: Steve Rae <srae@broadcom.com>
This commit is contained in:
Steve Rae
2014-05-05 13:00:08 -07:00
committed by Tom Rini
parent fa39ffe5d6
commit ae95fad5af
2 changed files with 26 additions and 10 deletions
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disk/part_efi.c
+19 -3
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@@ -93,7 +93,15 @@ void print_part_efi(block_dev_desc_t * dev_desc)
if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA,
gpt_head, &gpt_pte) != 1) {
printf("%s: *** ERROR: Invalid GPT ***\n", __func__);
return;
if (is_gpt_valid(dev_desc, (dev_desc->lba - 1),
gpt_head, &gpt_pte) != 1) {
printf("%s: *** ERROR: Invalid Backup GPT ***\n",
__func__);
return;
} else {
printf("%s: *** Using Backup GPT ***\n",
__func__);
}
}
debug("%s: gpt-entry at %p\n", __func__, gpt_pte);
@@ -142,7 +150,15 @@ int get_partition_info_efi(block_dev_desc_t * dev_desc, int part,
if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA,
gpt_head, &gpt_pte) != 1) {
printf("%s: *** ERROR: Invalid GPT ***\n", __func__);
return -1;
if (is_gpt_valid(dev_desc, (dev_desc->lba - 1),
gpt_head, &gpt_pte) != 1) {
printf("%s: *** ERROR: Invalid Backup GPT ***\n",
__func__);
return -1;
} else {
printf("%s: *** Using Backup GPT ***\n",
__func__);
}
}
if (part > le32_to_cpu(gpt_head->num_partition_entries) ||
@@ -252,7 +268,7 @@ int write_gpt_table(block_dev_desc_t *dev_desc,
!= pte_blk_cnt)
goto err;
/* recalculate the values for the Second GPT Header */
/* recalculate the values for the Backup GPT Header */
val = le64_to_cpu(gpt_h->my_lba);
gpt_h->my_lba = gpt_h->alternate_lba;
gpt_h->alternate_lba = cpu_to_le64(val);