diff options
Diffstat (limited to 'grub-core/partmap/apple.c')
| -rw-r--r-- | grub-core/partmap/apple.c | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/grub-core/partmap/apple.c b/grub-core/partmap/apple.c new file mode 100644 index 0000000..c3ead0f --- /dev/null +++ b/grub-core/partmap/apple.c @@ -0,0 +1,199 @@ +/* apple.c - Read macintosh partition tables. */ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 2002,2004,2005,2006,2007,2008,2009 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+"); + +#define GRUB_APPLE_HEADER_MAGIC 0x4552 +#define GRUB_APPLE_PART_MAGIC 0x504D + +struct grub_apple_header +{ + /* The magic number to identify the partition map, it should have + the value `0x4552'. */ + grub_uint16_t magic; + grub_uint16_t blocksize; +}; + +struct grub_apple_part +{ + /* The magic number to identify this as a partition, it should have + the value `0x504D'. */ + grub_uint16_t magic; + + /* Reserved. */ + grub_uint16_t reserved; + + /* The size of the partition map in blocks. */ + grub_uint32_t partmap_size; + + /* The first physical block of the partition. */ + grub_uint32_t first_phys_block; + + /* The amount of blocks. */ + grub_uint32_t blockcnt; + + /* The partition name. */ + char partname[32]; + + /* The partition type. */ + char parttype[32]; + + /* The first datablock of the partition. */ + grub_uint32_t datablocks_first; + + /* The amount datablocks. */ + grub_uint32_t datablocks_count; + + /* The status of the partition. (???) */ + grub_uint32_t status; + + /* The first block on which the bootcode can be found. */ + grub_uint32_t bootcode_pos; + + /* The size of the bootcode in bytes. */ + grub_uint32_t bootcode_size; + + /* The load address of the bootcode. */ + grub_uint32_t bootcode_loadaddr; + + /* Reserved. */ + grub_uint32_t reserved2; + + /* The entry point of the bootcode. */ + grub_uint32_t bootcode_entrypoint; + + /* Reserved. */ + grub_uint32_t reserved3; + + /* A checksum of the bootcode. */ + grub_uint32_t bootcode_checksum; + + /* The processor type. */ + char processor[16]; + + /* Padding. */ + grub_uint16_t pad[187]; +}; + +static struct grub_partition_map grub_apple_partition_map; + + +static grub_err_t +apple_partition_map_iterate (grub_disk_t disk, + grub_partition_iterate_hook_t hook, + void *hook_data) +{ + struct grub_partition part; + struct grub_apple_header aheader; + struct grub_apple_part apart; + int partno = 0, partnum = 0; + unsigned pos; + + part.partmap = &grub_apple_partition_map; + + if (grub_disk_read (disk, 0, 0, sizeof (aheader), &aheader)) + return grub_errno; + + if (grub_be_to_cpu16 (aheader.magic) != GRUB_APPLE_HEADER_MAGIC) + { + grub_dprintf ("partition", + "bad magic (found 0x%x; wanted 0x%x)\n", + grub_be_to_cpu16 (aheader.magic), + GRUB_APPLE_HEADER_MAGIC); + goto fail; + } + + pos = grub_be_to_cpu16 (aheader.blocksize); + + do + { + part.offset = pos / GRUB_DISK_SECTOR_SIZE; + part.index = pos % GRUB_DISK_SECTOR_SIZE; + + if (grub_disk_read (disk, part.offset, part.index, + sizeof (struct grub_apple_part), &apart)) + return grub_errno; + + if (grub_be_to_cpu16 (apart.magic) != GRUB_APPLE_PART_MAGIC) + { + grub_dprintf ("partition", + "partition %d: bad magic (found 0x%x; wanted 0x%x)\n", + partno, grub_be_to_cpu16 (apart.magic), + GRUB_APPLE_PART_MAGIC); + break; + } + + if (partnum == 0) + partnum = grub_be_to_cpu32 (apart.partmap_size); + + part.start = ((grub_disk_addr_t) grub_be_to_cpu32 (apart.first_phys_block) + * grub_be_to_cpu16 (aheader.blocksize)) + / GRUB_DISK_SECTOR_SIZE; + part.len = ((grub_disk_addr_t) grub_be_to_cpu32 (apart.blockcnt) + * grub_be_to_cpu16 (aheader.blocksize)) + / GRUB_DISK_SECTOR_SIZE; + part.offset = pos; + part.index = partno; + part.number = partno; + + grub_dprintf ("partition", + "partition %d: name %s, type %s, start 0x%x, len 0x%x\n", + partno, apart.partname, apart.parttype, + grub_be_to_cpu32 (apart.first_phys_block), + grub_be_to_cpu32 (apart.blockcnt)); + + if (hook (disk, &part, hook_data)) + return grub_errno; + + pos += grub_be_to_cpu16 (aheader.blocksize); + partno++; + } + while (partno < partnum); + + if (partno != 0) + return 0; + + fail: + return grub_error (GRUB_ERR_BAD_PART_TABLE, + "Apple partition map not found"); +} + + +/* Partition map type. */ +static struct grub_partition_map grub_apple_partition_map = + { + .name = "apple", + .iterate = apple_partition_map_iterate, + }; + +GRUB_MOD_INIT(part_apple) +{ + grub_partition_map_register (&grub_apple_partition_map); +} + +GRUB_MOD_FINI(part_apple) +{ + grub_partition_map_unregister (&grub_apple_partition_map); +} + |