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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>
GRUB_MOD_LICENSE ("GPLv3+");
#define AMIGA_CHECKSUM_WORDS 128
struct grub_amiga_rdsk
{
/* "RDSK". */
grub_uint8_t magic[4];
#define GRUB_AMIGA_RDSK_MAGIC "RDSK"
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;
grub_uint32_t unused[AMIGA_CHECKSUM_WORDS - 9];
} GRUB_PACKED;
struct grub_amiga_partition
{
/* "PART". */
grub_uint8_t magic[4];
#define GRUB_AMIGA_PART_MAGIC "PART"
grub_uint32_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;
grub_uint32_t unused[AMIGA_CHECKSUM_WORDS - 44];
} GRUB_PACKED;
static struct grub_partition_map grub_amiga_partition_map;
static grub_uint32_t
amiga_partition_map_checksum (void *buf)
{
grub_uint32_t *ptr = buf;
grub_uint32_t r = 0;
grub_size_t sz;
/* Fancy and quick way of checking sz >= 512 / 4 = 128. */
if (ptr[1] & ~grub_cpu_to_be32_compile_time (AMIGA_CHECKSUM_WORDS - 1))
sz = AMIGA_CHECKSUM_WORDS;
else
sz = grub_be_to_cpu32 (ptr[1]);
for (; sz; sz--, ptr++)
r += grub_be_to_cpu32 (*ptr);
return r;
}
static grub_err_t
amiga_partition_map_iterate (grub_disk_t disk,
grub_partition_iterate_hook_t hook,
void *hook_data)
{
struct grub_partition part;
struct grub_amiga_rdsk rdsk;
int partno = 0;
int next = -1;
unsigned pos;
/* 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 (disk, pos, 0, sizeof (rdsk), &rdsk))
return grub_errno;
if (grub_memcmp (rdsk.magic, GRUB_AMIGA_RDSK_MAGIC,
sizeof (rdsk.magic)) == 0
&& amiga_partition_map_checksum (&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 (disk, next, 0, sizeof (apart), &apart))
return grub_errno;
if (grub_memcmp (apart.magic, GRUB_AMIGA_PART_MAGIC,
sizeof (apart.magic)) != 0
|| amiga_partition_map_checksum (&apart) != 0)
return grub_error (GRUB_ERR_BAD_PART_TABLE,
"invalid Amiga partition map");
/* 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 = next;
part.number = partno;
part.index = 0;
part.partmap = &grub_amiga_partition_map;
if (hook (disk, &part, hook_data))
return grub_errno;
next = grub_be_to_cpu32 (apart.next);
partno++;
}
return 0;
}
/* Partition map type. */
static struct grub_partition_map grub_amiga_partition_map =
{
.name = "amiga",
.iterate = amiga_partition_map_iterate,
};
GRUB_MOD_INIT(part_amiga)
{
grub_partition_map_register (&grub_amiga_partition_map);
}
GRUB_MOD_FINI(part_amiga)
{
grub_partition_map_unregister (&grub_amiga_partition_map);
}
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