132 lines
3.9 KiB
C
132 lines
3.9 KiB
C
/* dfly.c - Read DragonFly BSD disklabel64. */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2013 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/disk.h>
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#include <grub/misc.h>
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#include <grub/mm.h>
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#include <grub/partition.h>
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GRUB_MOD_LICENSE ("GPLv3+");
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static struct grub_partition_map grub_dfly_partition_map;
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#define GRUB_PARTITION_DISKLABEL64_HEADER_SIZE 200
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/* Full entry is 64 bytes however we really care only
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about offset and size which are in first 16 bytes.
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Avoid using too much stack. */
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#define GRUB_PARTITION_DISKLABEL64_ENTRY_SIZE 64
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struct grub_partition_disklabel64_entry
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{
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grub_uint64_t boffset;
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grub_uint64_t bsize;
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};
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/* Full entry is 200 bytes however we really care only
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about magic and number of partitions which are in first 16 bytes.
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Avoid using too much stack. */
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struct grub_partition_disklabel64
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{
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grub_uint32_t magic;
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#define GRUB_DISKLABEL64_MAGIC ((grub_uint32_t)0xc4464c59)
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grub_uint32_t crc;
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grub_uint32_t unused;
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grub_uint32_t npartitions;
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};
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static grub_err_t
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dfly_partition_map_iterate (grub_disk_t disk,
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grub_partition_iterate_hook_t hook,
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void *hook_data)
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{
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struct grub_partition part;
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unsigned partno, pos;
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struct grub_partition_disklabel64 label;
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part.partmap = &grub_dfly_partition_map;
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if (grub_disk_read (disk, 1, 0, sizeof (label), &label))
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return grub_errno;
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if (label.magic != grub_cpu_to_le32_compile_time (GRUB_DISKLABEL64_MAGIC))
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{
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grub_dprintf ("partition",
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"bad magic (found 0x%x; wanted 0x%x)\n",
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(unsigned int) grub_le_to_cpu32 (label.magic),
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(unsigned int) GRUB_DISKLABEL64_MAGIC);
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return grub_error (GRUB_ERR_BAD_PART_TABLE, "disklabel64 not found");
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}
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pos = GRUB_PARTITION_DISKLABEL64_HEADER_SIZE + GRUB_DISK_SECTOR_SIZE;
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for (partno = 0;
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partno < grub_le_to_cpu32 (label.npartitions); ++partno)
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{
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grub_disk_addr_t sector = pos >> GRUB_DISK_SECTOR_BITS;
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grub_off_t offset = pos & (GRUB_DISK_SECTOR_SIZE - 1);
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struct grub_partition_disklabel64_entry dpart;
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pos += GRUB_PARTITION_DISKLABEL64_ENTRY_SIZE;
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if (grub_disk_read (disk, sector, offset, sizeof (dpart), &dpart))
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return grub_errno;
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grub_dprintf ("partition",
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"partition %2d: offset 0x%llx, "
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"size 0x%llx\n",
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partno,
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(unsigned long long) grub_le_to_cpu64 (dpart.boffset),
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(unsigned long long) grub_le_to_cpu64 (dpart.bsize));
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/* Is partition initialized? */
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if (dpart.bsize == 0)
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continue;
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part.number = partno;
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part.start = grub_le_to_cpu64 (dpart.boffset) >> GRUB_DISK_SECTOR_BITS;
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part.len = grub_le_to_cpu64 (dpart.bsize) >> GRUB_DISK_SECTOR_BITS;
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/* This is counter-intuitive, but part.offset and sector have
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* the same type, and offset (NOT part.offset) is guaranteed
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* to fit into part.index. */
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part.offset = sector;
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part.index = offset;
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if (hook (disk, &part, hook_data))
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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_dfly_partition_map =
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{
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.name = "dfly",
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.iterate = dfly_partition_map_iterate,
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};
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GRUB_MOD_INIT(part_dfly)
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{
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grub_partition_map_register (&grub_dfly_partition_map);
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}
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GRUB_MOD_FINI(part_dfly)
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{
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grub_partition_map_unregister (&grub_dfly_partition_map);
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}
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