grub/partmap/sun.c
2010-01-20 09:12:47 +01:00

208 lines
5.6 KiB
C

/* sun.c - Read SUN style partition tables. */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2002,2005,2006,2007 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/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_MAGIC 0xDABE
#define GRUB_PARTMAP_SUN_MAX_PARTS 8
#define GRUB_PARTMAP_SUN_WHOLE_DISK_ID 0x05
struct grub_sun_partition_info
{
grub_uint8_t spare1;
grub_uint8_t id;
grub_uint8_t spare2;
grub_uint8_t flags;
} __attribute__ ((packed));
struct grub_sun_partition_descriptor
{
grub_uint32_t start_cylinder;
grub_uint32_t num_sectors;
} __attribute__ ((packed));
struct grub_sun_block
{
grub_uint8_t info[128]; /* Informative text string. */
grub_uint8_t spare0[14];
struct grub_sun_partition_info infos[8];
grub_uint8_t spare1[246]; /* Boot information etc. */
grub_uint16_t rspeed; /* Disk rotational speed. */
grub_uint16_t pcylcount; /* Physical cylinder count. */
grub_uint16_t sparecyl; /* extra sects per cylinder. */
grub_uint8_t spare2[4]; /* More magic... */
grub_uint16_t ilfact; /* Interleave factor. */
grub_uint16_t ncyl; /* Data cylinder count. */
grub_uint16_t nacyl; /* Alt. cylinder count. */
grub_uint16_t ntrks; /* Tracks per cylinder. */
grub_uint16_t nsect; /* Sectors per track. */
grub_uint8_t spare3[4]; /* Even more magic... */
struct grub_sun_partition_descriptor partitions[8];
grub_uint16_t magic; /* Magic number. */
grub_uint16_t csum; /* Label xor'd checksum. */
} __attribute__ ((packed));
static struct grub_partition_map grub_sun_partition_map;
/* Verify checksum (true=ok). */
static int
grub_sun_is_valid (struct grub_sun_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_partition_map_iterate (grub_disk_t disk,
int (*hook) (grub_disk_t disk,
const grub_partition_t partition))
{
grub_partition_t p;
struct grub_disk raw;
struct grub_sun_block block;
int partnum;
raw = *disk;
raw.partition = 0;
p = (grub_partition_t) grub_zalloc (sizeof (struct grub_partition));
if (! p)
return grub_errno;
p->partmap = &grub_sun_partition_map;
if (grub_disk_read (&raw, 0, 0, sizeof (struct grub_sun_block),
&block) == GRUB_ERR_NONE)
{
if (GRUB_PARTMAP_SUN_MAGIC != grub_be_to_cpu16 (block.magic))
grub_error (GRUB_ERR_BAD_PART_TABLE, "not a sun partition table");
if (! grub_sun_is_valid (&block))
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_MAX_PARTS; partnum++)
{
struct grub_sun_partition_descriptor *desc;
if (block.infos[partnum].id == 0
|| block.infos[partnum].id == GRUB_PARTMAP_SUN_WHOLE_DISK_ID)
continue;
desc = &block.partitions[partnum];
p->start = ((grub_uint64_t) grub_be_to_cpu32 (desc->start_cylinder)
* grub_be_to_cpu16 (block.ntrks)
* grub_be_to_cpu16 (block.nsect));
p->len = grub_be_to_cpu32 (desc->num_sectors);
p->index = partnum;
if (p->len)
{
if (hook (disk, p))
partnum = GRUB_PARTMAP_SUN_MAX_PARTS;
}
}
}
grub_free (p);
return grub_errno;
}
static grub_partition_t
sun_partition_map_probe (grub_disk_t disk, const char *str)
{
grub_partition_t p = 0;
int partnum = 0;
char *s = (char *) str;
auto int find_func (grub_disk_t d, const grub_partition_t partition);
int find_func (grub_disk_t d __attribute__ ((unused)),
const grub_partition_t partition)
{
if (partnum == partition->index)
{
p = (grub_partition_t) grub_malloc (sizeof (*p));
if (p)
grub_memcpy (p, partition, sizeof (*p));
return 1;
}
return 0;
}
grub_errno = GRUB_ERR_NONE;
partnum = grub_strtoul (s, 0, 10) - 1;
if (grub_errno == GRUB_ERR_NONE)
{
if (sun_partition_map_iterate (disk, find_func))
{
grub_free (p);
p = 0;
}
}
else
{
grub_error (GRUB_ERR_BAD_FILENAME, "invalid partition");
p = 0;
}
return p;
}
static char *
sun_partition_map_get_name (const grub_partition_t p)
{
return grub_xasprintf ("%d", p->index + 1);
}
/* Partition map type. */
static struct grub_partition_map grub_sun_partition_map =
{
.name = "part_sun",
.iterate = sun_partition_map_iterate,
.probe = sun_partition_map_probe,
.get_name = sun_partition_map_get_name
};
GRUB_MOD_INIT(sun_partition_map)
{
grub_partition_map_register (&grub_sun_partition_map);
}
GRUB_MOD_FINI(sun_partition_map)
{
grub_partition_map_unregister (&grub_sun_partition_map);
}