148 lines
4.1 KiB
C
148 lines
4.1 KiB
C
/* 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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#ifdef GRUB_UTIL
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#include <grub/util/misc.h>
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#endif
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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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/* 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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/* A kludge to determine a base of be.offset. */
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if (GRUB_PC_PARTITION_BSD_LABEL_WHOLE_DISK_PARTITION
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< grub_cpu_to_le16 (label.num_partitions))
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{
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struct grub_partition_bsd_entry whole_disk_be;
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pos = sizeof (label) + GRUB_PC_PARTITION_BSD_LABEL_SECTOR
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* GRUB_DISK_SECTOR_SIZE + sizeof (struct grub_partition_bsd_entry)
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* GRUB_PC_PARTITION_BSD_LABEL_WHOLE_DISK_PARTITION;
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if (grub_disk_read (disk, pos / GRUB_DISK_SECTOR_SIZE,
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pos % GRUB_DISK_SECTOR_SIZE, sizeof (whole_disk_be),
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&whole_disk_be))
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return grub_errno;
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delta = grub_le_to_cpu32 (whole_disk_be.offset);
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}
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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++, pos += sizeof (struct grub_partition_bsd_entry))
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{
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struct grub_partition_bsd_entry be;
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if (p.number == GRUB_PC_PARTITION_BSD_LABEL_WHOLE_DISK_PARTITION)
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continue;
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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);
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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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grub_dprintf ("partition",
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"partition %d: type 0x%x, start 0x%llx, len 0x%llx\n",
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p.number, be.fs_type,
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(unsigned long long) p.start,
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(unsigned long long) p.len);
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if (p.len == 0)
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continue;
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if (p.start < delta)
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{
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#ifdef GRUB_UTIL
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char *partname;
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#endif
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grub_dprintf ("partition",
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"partition %d: invalid start (found 0x%llx, wanted >= 0x%llx)\n",
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p.number,
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(unsigned long long) p.start,
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(unsigned long long) delta);
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#ifdef GRUB_UTIL
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/* disk->partition != NULL as 0 < delta */
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partname = grub_partition_get_name (disk->partition);
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grub_util_warn ("Discarding improperly nested partition (%s,%s,%s%d)",
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disk->name, partname, p.partmap->name, p.number + 1);
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grub_free (partname);
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#endif
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continue;
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}
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p.start -= delta;
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if (hook (disk, &p))
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return grub_errno;
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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 = "bsd",
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.iterate = bsdlabel_partition_map_iterate,
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};
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GRUB_MOD_INIT(part_bsd)
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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(part_bsd)
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{
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grub_partition_map_unregister (&grub_bsdlabel_partition_map);
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}
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