diff options
Diffstat (limited to 'grub-core/partmap/amiga.c')
| -rw-r--r-- | grub-core/partmap/amiga.c | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/grub-core/partmap/amiga.c b/grub-core/partmap/amiga.c new file mode 100644 index 0000000..13034f1 --- /dev/null +++ b/grub-core/partmap/amiga.c @@ -0,0 +1,183 @@ +/* amiga.c - Read amiga partition tables (RDB). */ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 2002,2004,2005,2006,2007 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> +#include <grub/dl.h> + +GRUB_MOD_LICENSE ("GPLv3+"); + +#define AMIGA_CHECKSUM_WORDS 128 + +struct grub_amiga_rdsk +{ + /* "RDSK". */ + grub_uint8_t magic[4]; +#define GRUB_AMIGA_RDSK_MAGIC "RDSK" + grub_uint32_t size; + grub_int32_t checksum; + grub_uint32_t scsihost; + grub_uint32_t blksz; + grub_uint32_t flags; + grub_uint32_t badblcklst; + grub_uint32_t partitionlst; + grub_uint32_t fslst; + + grub_uint32_t unused[AMIGA_CHECKSUM_WORDS - 9]; +} GRUB_PACKED; + +struct grub_amiga_partition +{ + /* "PART". */ + grub_uint8_t magic[4]; +#define GRUB_AMIGA_PART_MAGIC "PART" + grub_uint32_t size; + grub_int32_t checksum; + grub_uint32_t scsihost; + grub_uint32_t next; + grub_uint32_t flags; + grub_uint32_t unused1[2]; + grub_uint32_t devflags; + grub_uint8_t namelen; + grub_uint8_t name[31]; + grub_uint32_t unused2[15]; + + grub_uint32_t unused3[3]; + grub_uint32_t heads; + grub_uint32_t unused4; + grub_uint32_t block_per_track; + grub_uint32_t unused5[3]; + grub_uint32_t lowcyl; + grub_uint32_t highcyl; + + grub_uint32_t firstcyl; + grub_uint32_t unused[AMIGA_CHECKSUM_WORDS - 44]; +} GRUB_PACKED; + +static struct grub_partition_map grub_amiga_partition_map; + + + +static grub_uint32_t +amiga_partition_map_checksum (void *buf) +{ + grub_uint32_t *ptr = buf; + grub_uint32_t r = 0; + grub_size_t sz; + /* Fancy and quick way of checking sz >= 512 / 4 = 128. */ + if (ptr[1] & ~grub_cpu_to_be32_compile_time (AMIGA_CHECKSUM_WORDS - 1)) + sz = AMIGA_CHECKSUM_WORDS; + else + sz = grub_be_to_cpu32 (ptr[1]); + + for (; sz; sz--, ptr++) + r += grub_be_to_cpu32 (*ptr); + + return r; +} + +static grub_err_t +amiga_partition_map_iterate (grub_disk_t disk, + grub_partition_iterate_hook_t hook, + void *hook_data) +{ + struct grub_partition part; + struct grub_amiga_rdsk rdsk; + int partno = 0; + int next = -1; + unsigned pos; + + /* The RDSK block is one of the first 15 blocks. */ + for (pos = 0; pos < 15; pos++) + { + /* Read the RDSK block which is a descriptor for the entire disk. */ + if (grub_disk_read (disk, pos, 0, sizeof (rdsk), &rdsk)) + return grub_errno; + + if (grub_memcmp (rdsk.magic, GRUB_AMIGA_RDSK_MAGIC, + sizeof (rdsk.magic)) == 0 + && amiga_partition_map_checksum (&rdsk) == 0) + { + /* Found the first PART block. */ + next = grub_be_to_cpu32 (rdsk.partitionlst); + break; + } + } + + if (next == -1) + return grub_error (GRUB_ERR_BAD_PART_TABLE, + "Amiga partition map not found"); + + /* The end of the partition list is marked using "-1". */ + while (next != -1) + { + struct grub_amiga_partition apart; + + /* Read the RDSK block which is a descriptor for the entire disk. */ + if (grub_disk_read (disk, next, 0, sizeof (apart), &apart)) + return grub_errno; + + if (grub_memcmp (apart.magic, GRUB_AMIGA_PART_MAGIC, + sizeof (apart.magic)) != 0 + || amiga_partition_map_checksum (&apart) != 0) + return grub_error (GRUB_ERR_BAD_PART_TABLE, + "invalid Amiga partition map"); + /* Calculate the first block and the size of the partition. */ + part.start = (grub_be_to_cpu32 (apart.lowcyl) + * grub_be_to_cpu32 (apart.heads) + * grub_be_to_cpu32 (apart.block_per_track)); + part.len = ((grub_be_to_cpu32 (apart.highcyl) + - grub_be_to_cpu32 (apart.lowcyl) + 1) + * grub_be_to_cpu32 (apart.heads) + * grub_be_to_cpu32 (apart.block_per_track)); + + part.offset = next; + part.number = partno; + part.index = 0; + part.partmap = &grub_amiga_partition_map; + + if (hook (disk, &part, hook_data)) + return grub_errno; + + next = grub_be_to_cpu32 (apart.next); + partno++; + } + + return 0; +} + + +/* Partition map type. */ +static struct grub_partition_map grub_amiga_partition_map = + { + .name = "amiga", + .iterate = amiga_partition_map_iterate, + }; + +GRUB_MOD_INIT(part_amiga) +{ + grub_partition_map_register (&grub_amiga_partition_map); +} + +GRUB_MOD_FINI(part_amiga) +{ + grub_partition_map_unregister (&grub_amiga_partition_map); +} |