diff options
Diffstat (limited to 'grub-core/partmap/dfly.c')
| -rw-r--r-- | grub-core/partmap/dfly.c | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/grub-core/partmap/dfly.c b/grub-core/partmap/dfly.c new file mode 100644 index 0000000..d30da86 --- /dev/null +++ b/grub-core/partmap/dfly.c @@ -0,0 +1,132 @@ +/* dfly.c - Read DragonFly BSD disklabel64. */ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 2013 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/disk.h> +#include <grub/misc.h> +#include <grub/mm.h> +#include <grub/partition.h> + +GRUB_MOD_LICENSE ("GPLv3+"); + +static struct grub_partition_map grub_dfly_partition_map; + +#define GRUB_PARTITION_DISKLABEL64_HEADER_SIZE 200 + +/* Full entry is 64 bytes however we really care only + about offset and size which are in first 16 bytes. + Avoid using too much stack. */ +#define GRUB_PARTITION_DISKLABEL64_ENTRY_SIZE 64 +struct grub_partition_disklabel64_entry +{ + grub_uint64_t boffset; + grub_uint64_t bsize; +}; + +/* Full entry is 200 bytes however we really care only + about magic and number of partitions which are in first 16 bytes. + Avoid using too much stack. */ +struct grub_partition_disklabel64 +{ + grub_uint32_t magic; +#define GRUB_DISKLABEL64_MAGIC ((grub_uint32_t)0xc4464c59) + grub_uint32_t crc; + grub_uint32_t unused; + grub_uint32_t npartitions; +}; + +static grub_err_t +dfly_partition_map_iterate (grub_disk_t disk, + grub_partition_iterate_hook_t hook, + void *hook_data) +{ + struct grub_partition part; + unsigned partno, pos; + struct grub_partition_disklabel64 label; + + part.partmap = &grub_dfly_partition_map; + + if (grub_disk_read (disk, 1, 0, sizeof (label), &label)) + return grub_errno; + + if (label.magic != grub_cpu_to_le32_compile_time (GRUB_DISKLABEL64_MAGIC)) + { + grub_dprintf ("partition", + "bad magic (found 0x%x; wanted 0x%x)\n", + (unsigned int) grub_le_to_cpu32 (label.magic), + (unsigned int) GRUB_DISKLABEL64_MAGIC); + return grub_error (GRUB_ERR_BAD_PART_TABLE, "disklabel64 not found"); + } + + pos = GRUB_PARTITION_DISKLABEL64_HEADER_SIZE + GRUB_DISK_SECTOR_SIZE; + + for (partno = 0; + partno < grub_le_to_cpu32 (label.npartitions); ++partno) + { + grub_disk_addr_t sector = pos >> GRUB_DISK_SECTOR_BITS; + grub_off_t offset = pos & (GRUB_DISK_SECTOR_SIZE - 1); + struct grub_partition_disklabel64_entry dpart; + + pos += GRUB_PARTITION_DISKLABEL64_ENTRY_SIZE; + if (grub_disk_read (disk, sector, offset, sizeof (dpart), &dpart)) + return grub_errno; + + grub_dprintf ("partition", + "partition %2d: offset 0x%llx, " + "size 0x%llx\n", + partno, + (unsigned long long) grub_le_to_cpu64 (dpart.boffset), + (unsigned long long) grub_le_to_cpu64 (dpart.bsize)); + + /* Is partition initialized? */ + if (dpart.bsize == 0) + continue; + + part.number = partno; + part.start = grub_le_to_cpu64 (dpart.boffset) >> GRUB_DISK_SECTOR_BITS; + part.len = grub_le_to_cpu64 (dpart.bsize) >> GRUB_DISK_SECTOR_BITS; + + /* This is counter-intuitive, but part.offset and sector have + * the same type, and offset (NOT part.offset) is guaranteed + * to fit into part.index. */ + part.offset = sector; + part.index = offset; + + if (hook (disk, &part, hook_data)) + return grub_errno; + } + + return GRUB_ERR_NONE; +} + +/* Partition map type. */ +static struct grub_partition_map grub_dfly_partition_map = +{ + .name = "dfly", + .iterate = dfly_partition_map_iterate, +}; + +GRUB_MOD_INIT(part_dfly) +{ + grub_partition_map_register (&grub_dfly_partition_map); +} + +GRUB_MOD_FINI(part_dfly) +{ + grub_partition_map_unregister (&grub_dfly_partition_map); +} |