grub/partmap/amiga.c
2009-06-10 21:04:23 +00:00

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/* 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>
struct grub_amiga_rdsk
{
/* "RDSK". */
grub_uint8_t magic[4];
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;
/* The other information is not important for us. */
} __attribute__ ((packed));
struct grub_amiga_partition
{
/* "PART". */
grub_uint8_t magic[4];
grub_int32_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;
} __attribute__ ((packed));
static struct grub_partition_map grub_amiga_partition_map;
static grub_err_t
amiga_partition_map_iterate (grub_disk_t disk,
int (*hook) (grub_disk_t disk,
const grub_partition_t partition))
{
struct grub_partition part;
struct grub_amiga_rdsk rdsk;
struct grub_disk raw;
int partno = 0;
int next = -1;
unsigned pos;
/* Enforce raw disk access. */
raw = *disk;
raw.partition = 0;
/* 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 (&raw, pos, 0, sizeof (rdsk), &rdsk))
return grub_errno;
if (grub_strcmp ((char *) rdsk.magic, "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 (&raw, next, 0, sizeof (apart), &apart))
return grub_errno;
/* 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 = (grub_off_t) next * 512;
part.index = partno;
part.partmap = &grub_amiga_partition_map;
if (hook (disk, &part))
return grub_errno;
next = grub_be_to_cpu32 (apart.next);
partno++;
}
return 0;
}
static grub_partition_t
amiga_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)
return 1;
grub_memcpy (p, partition, sizeof (*p));
return 1;
}
return 0;
}
/* Get the partition number. */
partnum = grub_strtoul (s, 0, 10) - 1;
if (grub_errno)
{
grub_error (GRUB_ERR_BAD_FILENAME, "invalid partition");
return 0;
}
if (amiga_partition_map_iterate (disk, find_func))
goto fail;
return p;
fail:
grub_free (p);
return 0;
}
static char *
amiga_partition_map_get_name (const grub_partition_t p)
{
char *name;
name = grub_malloc (13);
if (! name)
return 0;
grub_sprintf (name, "%d", p->index + 1);
return name;
}
/* Partition map type. */
static struct grub_partition_map grub_amiga_partition_map =
{
.name = "amiga_partition_map",
.iterate = amiga_partition_map_iterate,
.probe = amiga_partition_map_probe,
.get_name = amiga_partition_map_get_name
};
GRUB_MOD_INIT(amiga_partition_map)
{
grub_partition_map_register (&grub_amiga_partition_map);
}
GRUB_MOD_FINI(amiga_partition_map)
{
grub_partition_map_unregister (&grub_amiga_partition_map);
}