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/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2002,2005,2006,2007,2011 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 DVH_MAGIC 0x0be5a941
struct grub_dvh_partition_descriptor
{
grub_uint32_t length;
grub_uint32_t start;
grub_uint32_t type;
} GRUB_PACKED;
struct grub_dvh_block
{
grub_uint32_t magic;
grub_uint8_t unused[308];
struct grub_dvh_partition_descriptor parts[16];
grub_uint32_t checksum;
grub_uint32_t unused2;
} GRUB_PACKED;
static struct grub_partition_map grub_dvh_partition_map;
/* Verify checksum (true=ok). */
static int
grub_dvh_is_valid (grub_uint32_t *label)
{
grub_uint32_t *pos;
grub_uint32_t sum = 0;
for (pos = label;
pos < (label + sizeof (struct grub_dvh_block) / 4);
pos++)
sum += grub_be_to_cpu32 (*pos);
return ! sum;
}
static grub_err_t
dvh_partition_map_iterate (grub_disk_t disk,
grub_partition_iterate_hook_t hook, void *hook_data)
{
struct grub_partition p;
union
{
struct grub_dvh_block dvh;
grub_uint32_t raw[0];
} block;
unsigned partnum;
grub_err_t err;
p.partmap = &grub_dvh_partition_map;
err = grub_disk_read (disk, 0, 0, sizeof (struct grub_dvh_block),
&block);
if (err)
return err;
if (DVH_MAGIC != grub_be_to_cpu32 (block.dvh.magic))
return grub_error (GRUB_ERR_BAD_PART_TABLE, "not a dvh partition table");
if (! grub_dvh_is_valid (block.raw))
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 < ARRAY_SIZE (block.dvh.parts); partnum++)
{
if (block.dvh.parts[partnum].length == 0)
continue;
if (partnum == 10)
continue;
p.start = grub_be_to_cpu32 (block.dvh.parts[partnum].start);
p.len = grub_be_to_cpu32 (block.dvh.parts[partnum].length);
p.number = p.index = partnum;
if (hook (disk, &p, hook_data))
break;
}
return grub_errno;
}
/* Partition map type. */
static struct grub_partition_map grub_dvh_partition_map =
{
.name = "dvh",
.iterate = dvh_partition_map_iterate,
};
GRUB_MOD_INIT(part_dvh)
{
grub_partition_map_register (&grub_dvh_partition_map);
}
GRUB_MOD_FINI(part_dvh)
{
grub_partition_map_unregister (&grub_dvh_partition_map);
}
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