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