144 lines
3.8 KiB
C
144 lines
3.8 KiB
C
/* 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>
|
|
|
|
#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;
|
|
} __attribute__ ((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. */
|
|
} __attribute__ ((packed));
|
|
|
|
static struct grub_partition_map grub_sun_pc_partition_map;
|
|
|
|
/* Verify checksum (true=ok). */
|
|
static int
|
|
grub_sun_is_valid (struct grub_sun_pc_block *label)
|
|
{
|
|
grub_uint16_t *pos;
|
|
grub_uint16_t sum = 0;
|
|
|
|
for (pos = (grub_uint16_t *) label;
|
|
pos < (grub_uint16_t *) (label + 1);
|
|
pos++)
|
|
sum ^= *pos;
|
|
|
|
return ! sum;
|
|
}
|
|
|
|
static grub_err_t
|
|
sun_pc_partition_map_iterate (grub_disk_t disk,
|
|
int (*hook) (grub_disk_t disk,
|
|
const grub_partition_t partition))
|
|
{
|
|
grub_partition_t p;
|
|
struct grub_sun_pc_block 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.magic))
|
|
{
|
|
grub_free (p);
|
|
return grub_error (GRUB_ERR_BAD_PART_TABLE,
|
|
"not a sun_pc partition table");
|
|
}
|
|
|
|
if (! grub_sun_is_valid (&block))
|
|
{
|
|
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.partitions[partnum].id == 0
|
|
|| block.partitions[partnum].id == GRUB_PARTMAP_SUN_PC_WHOLE_DISK_ID)
|
|
continue;
|
|
|
|
desc = &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))
|
|
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);
|
|
}
|
|
|