grub/partmap/bsdlabel.c
Vladimir 'phcoder' Serbinenko c9ea504d25 merge mainline into nestpart
2010-03-26 15:44:13 +01:00

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2.8 KiB
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/* bsdlabel.c - Read BSD style partition tables. */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2002,2004,2005,2006,2007,2008,2009 Free Software Foundation, Inc.
*
* GRUB is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GRUB is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <grub/partition.h>
#include <grub/bsdlabel.h>
#include <grub/disk.h>
#include <grub/mm.h>
#include <grub/misc.h>
#include <grub/dl.h>
static struct grub_partition_map grub_bsdlabel_partition_map;
static grub_err_t
bsdlabel_partition_map_iterate (grub_disk_t disk,
int (*hook) (grub_disk_t disk,
const grub_partition_t partition))
{
struct grub_partition_bsd_disk_label label;
struct grub_partition p;
grub_disk_addr_t delta = 0;
unsigned pos;
/* BSDLabel offsets are absolute even when it's embed inside partition. */
delta = grub_partition_get_start (disk->partition);
/* Read the BSD label. */
if (grub_disk_read (disk, GRUB_PC_PARTITION_BSD_LABEL_SECTOR,
0, sizeof (label), &label))
return grub_errno;
/* Check if it is valid. */
if (label.magic != grub_cpu_to_le32 (GRUB_PC_PARTITION_BSD_LABEL_MAGIC))
return grub_error (GRUB_ERR_BAD_PART_TABLE, "no signature");
pos = sizeof (label) + GRUB_PC_PARTITION_BSD_LABEL_SECTOR
* GRUB_DISK_SECTOR_SIZE;
for (p.number = 0;
p.number < grub_cpu_to_le16 (label.num_partitions);
p.number++)
{
struct grub_partition_bsd_entry be;
p.offset = pos / GRUB_DISK_SECTOR_SIZE;
p.index = pos % GRUB_DISK_SECTOR_SIZE;
if (grub_disk_read (disk, p.offset, p.index, sizeof (be), &be))
return grub_errno;
p.start = grub_le_to_cpu32 (be.offset) - delta;
p.len = grub_le_to_cpu32 (be.size);
p.partmap = &grub_bsdlabel_partition_map;
if (be.fs_type != GRUB_PC_PARTITION_BSD_TYPE_UNUSED)
if (hook (disk, &p))
return grub_errno;
pos += sizeof (struct grub_partition_bsd_entry);
}
return GRUB_ERR_NONE;
}
/* Partition map type. */
static struct grub_partition_map grub_bsdlabel_partition_map =
{
.name = "bsd",
.iterate = bsdlabel_partition_map_iterate,
};
GRUB_MOD_INIT(part_bsd)
{
grub_partition_map_register (&grub_bsdlabel_partition_map);
}
GRUB_MOD_FINI(part_bsd)
{
grub_partition_map_unregister (&grub_bsdlabel_partition_map);
}