diff options
Diffstat (limited to 'disk/part_efi.c')
| -rw-r--r-- | disk/part_efi.c | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/disk/part_efi.c b/disk/part_efi.c index 2c77f29d454..338010e148e 100644 --- a/disk/part_efi.c +++ b/disk/part_efi.c @@ -161,6 +161,8 @@ static void prepare_backup_gpt_header(gpt_header *gpt_h) val = le64_to_cpu(gpt_h->my_lba); gpt_h->my_lba = gpt_h->alternate_lba; gpt_h->alternate_lba = cpu_to_le64(val); + gpt_h->partition_entry_lba = + cpu_to_le64(le64_to_cpu(gpt_h->last_usable_lba) + 1); gpt_h->header_crc32 = 0; calc_crc32 = efi_crc32((const unsigned char *)gpt_h, @@ -545,6 +547,97 @@ err: free(gpt_h); return ret; } + +int is_valid_gpt_buf(block_dev_desc_t *dev_desc, void *buf) +{ + gpt_header *gpt_h; + gpt_entry *gpt_e; + + /* determine start of GPT Header in the buffer */ + gpt_h = buf + (GPT_PRIMARY_PARTITION_TABLE_LBA * + dev_desc->blksz); + if (validate_gpt_header(gpt_h, GPT_PRIMARY_PARTITION_TABLE_LBA, + dev_desc->lba)) + return -1; + + /* determine start of GPT Entries in the buffer */ + gpt_e = buf + (le64_to_cpu(gpt_h->partition_entry_lba) * + dev_desc->blksz); + if (validate_gpt_entries(gpt_h, gpt_e)) + return -1; + + return 0; +} + +int write_mbr_and_gpt_partitions(block_dev_desc_t *dev_desc, void *buf) +{ + gpt_header *gpt_h; + gpt_entry *gpt_e; + int gpt_e_blk_cnt; + lbaint_t lba; + int cnt; + + if (is_valid_gpt_buf(dev_desc, buf)) + return -1; + + /* determine start of GPT Header in the buffer */ + gpt_h = buf + (GPT_PRIMARY_PARTITION_TABLE_LBA * + dev_desc->blksz); + + /* determine start of GPT Entries in the buffer */ + gpt_e = buf + (le64_to_cpu(gpt_h->partition_entry_lba) * + dev_desc->blksz); + gpt_e_blk_cnt = BLOCK_CNT((le32_to_cpu(gpt_h->num_partition_entries) * + le32_to_cpu(gpt_h->sizeof_partition_entry)), + dev_desc); + + /* write MBR */ + lba = 0; /* MBR is always at 0 */ + cnt = 1; /* MBR (1 block) */ + if (dev_desc->block_write(dev_desc->dev, lba, cnt, buf) != cnt) { + printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n", + __func__, "MBR", cnt, lba); + return 1; + } + + /* write Primary GPT */ + lba = GPT_PRIMARY_PARTITION_TABLE_LBA; + cnt = 1; /* GPT Header (1 block) */ + if (dev_desc->block_write(dev_desc->dev, lba, cnt, gpt_h) != cnt) { + printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n", + __func__, "Primary GPT Header", cnt, lba); + return 1; + } + + lba = le64_to_cpu(gpt_h->partition_entry_lba); + cnt = gpt_e_blk_cnt; + if (dev_desc->block_write(dev_desc->dev, lba, cnt, gpt_e) != cnt) { + printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n", + __func__, "Primary GPT Entries", cnt, lba); + return 1; + } + + prepare_backup_gpt_header(gpt_h); + + /* write Backup GPT */ + lba = le64_to_cpu(gpt_h->partition_entry_lba); + cnt = gpt_e_blk_cnt; + if (dev_desc->block_write(dev_desc->dev, lba, cnt, gpt_e) != cnt) { + printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n", + __func__, "Backup GPT Entries", cnt, lba); + return 1; + } + + lba = le64_to_cpu(gpt_h->my_lba); + cnt = 1; /* GPT Header (1 block) */ + if (dev_desc->block_write(dev_desc->dev, lba, cnt, gpt_h) != cnt) { + printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n", + __func__, "Backup GPT Header", cnt, lba); + return 1; + } + + return 0; +} #endif /* |