diff options
Diffstat (limited to 'grub-core/partmap/sunpc.c')
| -rw-r--r-- | grub-core/partmap/sunpc.c | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/grub-core/partmap/sunpc.c b/grub-core/partmap/sunpc.c new file mode 100644 index 0000000..73a430c --- /dev/null +++ b/grub-core/partmap/sunpc.c @@ -0,0 +1,151 @@ +/* sunpc.c - Read SUN PC style partition tables. */ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 2002,2005,2006,2007,2009 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/partition.h> +#include <grub/disk.h> +#include <grub/mm.h> +#include <grub/misc.h> +#include <grub/dl.h> +#include <grub/symbol.h> +#include <grub/types.h> +#include <grub/err.h> + +GRUB_MOD_LICENSE ("GPLv3+"); + +#define GRUB_PARTMAP_SUN_PC_MAGIC 0xDABE +#define GRUB_PARTMAP_SUN_PC_MAX_PARTS 16 +#define GRUB_PARTMAP_SUN_PC_WHOLE_DISK_ID 0x05 + +struct grub_sun_pc_partition_descriptor +{ + grub_uint16_t id; + grub_uint16_t unused; + grub_uint32_t start_sector; + grub_uint32_t num_sectors; +} GRUB_PACKED; + +struct grub_sun_pc_block +{ + grub_uint8_t unused[72]; + struct grub_sun_pc_partition_descriptor partitions[GRUB_PARTMAP_SUN_PC_MAX_PARTS]; + grub_uint8_t unused2[244]; + grub_uint16_t magic; /* Magic number. */ + grub_uint16_t csum; /* Label xor'd checksum. */ +} GRUB_PACKED; + +static struct grub_partition_map grub_sun_pc_partition_map; + +/* Verify checksum (true=ok). */ +static int +grub_sun_is_valid (grub_uint16_t *label) +{ + grub_uint16_t *pos; + grub_uint16_t sum = 0; + + for (pos = label; + pos < (label + sizeof (struct grub_sun_pc_block) / 2); + pos++) + sum ^= *pos; + + return ! sum; +} + +static grub_err_t +sun_pc_partition_map_iterate (grub_disk_t disk, + grub_partition_iterate_hook_t hook, + void *hook_data) +{ + grub_partition_t p; + union + { + struct grub_sun_pc_block sun_block; + grub_uint16_t raw[0]; + } block; + int partnum; + grub_err_t err; + + p = (grub_partition_t) grub_zalloc (sizeof (struct grub_partition)); + if (! p) + return grub_errno; + + p->partmap = &grub_sun_pc_partition_map; + err = grub_disk_read (disk, 1, 0, sizeof (struct grub_sun_pc_block), &block); + if (err) + { + grub_free (p); + return err; + } + + if (GRUB_PARTMAP_SUN_PC_MAGIC != grub_le_to_cpu16 (block.sun_block.magic)) + { + grub_free (p); + return grub_error (GRUB_ERR_BAD_PART_TABLE, + "not a sun_pc partition table"); + } + + if (! grub_sun_is_valid (block.raw)) + { + grub_free (p); + return grub_error (GRUB_ERR_BAD_PART_TABLE, "invalid checksum"); + } + + /* Maybe another error value would be better, because partition + table _is_ recognized but invalid. */ + for (partnum = 0; partnum < GRUB_PARTMAP_SUN_PC_MAX_PARTS; partnum++) + { + struct grub_sun_pc_partition_descriptor *desc; + + if (block.sun_block.partitions[partnum].id == 0 + || block.sun_block.partitions[partnum].id + == GRUB_PARTMAP_SUN_PC_WHOLE_DISK_ID) + continue; + + desc = &block.sun_block.partitions[partnum]; + p->start = grub_le_to_cpu32 (desc->start_sector); + p->len = grub_le_to_cpu32 (desc->num_sectors); + p->number = partnum; + if (p->len) + { + if (hook (disk, p, hook_data)) + partnum = GRUB_PARTMAP_SUN_PC_MAX_PARTS; + } + } + + grub_free (p); + + return grub_errno; +} + +/* Partition map type. */ +static struct grub_partition_map grub_sun_pc_partition_map = + { + .name = "sunpc", + .iterate = sun_pc_partition_map_iterate, + }; + +GRUB_MOD_INIT(part_sunpc) +{ + grub_partition_map_register (&grub_sun_pc_partition_map); +} + +GRUB_MOD_FINI(part_sunpc) +{ + grub_partition_map_unregister (&grub_sun_pc_partition_map); +} + |