244 lines
6.8 KiB
C
244 lines
6.8 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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#include <grub/msdos_partition.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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iterate_real (grub_disk_t disk, grub_disk_addr_t sector, int freebsd,
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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, sector, 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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{
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grub_dprintf ("partition",
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"bad signature (found 0x%08x, expected 0x%08x)\n",
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label.magic,
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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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}
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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) && freebsd)
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{
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struct grub_partition_bsd_entry whole_disk_be;
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pos = sizeof (label) + sector * GRUB_DISK_SECTOR_SIZE
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+ 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) + sector * GRUB_DISK_SECTOR_SIZE;
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grub_dprintf ("partition", "bsdlabel with %d partitions detected\n",
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grub_cpu_to_le16 (label.num_partitions));
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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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#if !defined (NETBSDLABEL) && !defined (OPENBSDLABEL)
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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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if (disk->partition && grub_strcmp (disk->partition->partmap->name, "msdos")
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== 0 && disk->partition->msdostype == GRUB_PC_PARTITION_TYPE_FREEBSD)
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{
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grub_dprintf ("partition", "FreeBSD embedded iterating\n");
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return iterate_real (disk, GRUB_PC_PARTITION_BSD_LABEL_SECTOR, 1,
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hook);
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}
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if (disk->partition
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&& (grub_strcmp (disk->partition->partmap->name, "msdos") == 0
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|| grub_strcmp (disk->partition->partmap->name, "bsd") == 0
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|| grub_strcmp (disk->partition->partmap->name, "netbsd") == 0
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|| grub_strcmp (disk->partition->partmap->name, "openbsd") == 0))
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{
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grub_dprintf ("partition", "no embedded iterating\n");
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return grub_error (GRUB_ERR_BAD_PART_TABLE, "no embedding supported");
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}
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return iterate_real (disk, GRUB_PC_PARTITION_BSD_LABEL_SECTOR, 0, hook);
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}
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#else
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#ifdef OPENBSDLABEL
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#define GRUB_PC_PARTITION_TYPE_BSD GRUB_PC_PARTITION_TYPE_OPENBSD
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#else
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#define GRUB_PC_PARTITION_TYPE_BSD GRUB_PC_PARTITION_TYPE_NETBSD
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#endif
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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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grub_err_t err;
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if (disk->partition && grub_strcmp (disk->partition->partmap->name, "msdos")
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== 0)
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return grub_error (GRUB_ERR_BAD_PART_TABLE, "no embedding supported");
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{
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struct grub_msdos_partition_mbr mbr;
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unsigned i;
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err = grub_disk_read (disk, 0, 0, sizeof (mbr), &mbr);
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if (err)
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return err;
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for (i = 0; i < ARRAY_SIZE (mbr.entries); i++)
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if (mbr.entries[i].type == GRUB_PC_PARTITION_TYPE_BSD)
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{
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err = iterate_real (disk, mbr.entries[i].start
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+ GRUB_PC_PARTITION_BSD_LABEL_SECTOR, 0, hook);
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if (err != GRUB_ERR_BAD_PART_TABLE)
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return err;
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}
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}
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return grub_error (GRUB_ERR_BAD_PART_TABLE, "no bsdlabel found");
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}
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#endif
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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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#if defined (OPENBSDLABEL)
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.name = "openbsd",
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#elif defined (NETBSDLABEL)
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.name = "netbsd",
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#else
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.name = "bsd",
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#endif
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.iterate = bsdlabel_partition_map_iterate,
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};
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#if defined (OPENBSDLABEL)
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GRUB_MOD_INIT(part_openbsd)
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#elif defined (NETBSDLABEL)
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GRUB_MOD_INIT(part_netbsd)
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#else
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GRUB_MOD_INIT(part_bsd)
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#endif
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{
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grub_partition_map_register (&grub_bsdlabel_partition_map);
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}
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#if defined (OPENBSDLABEL)
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GRUB_MOD_FINI(part_openbsd)
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#elif defined (NETBSDLABEL)
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GRUB_MOD_FINI(part_netbsd)
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#else
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GRUB_MOD_FINI(part_bsd)
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#endif
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{
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grub_partition_map_unregister (&grub_bsdlabel_partition_map);
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}
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