142 lines
3.7 KiB
C
Executable File
142 lines
3.7 KiB
C
Executable File
/*
|
|
* fs/partitions/amiga.c
|
|
*
|
|
* Code extracted from drivers/block/genhd.c
|
|
*
|
|
* Copyright (C) 1991-1998 Linus Torvalds
|
|
* Re-organised Feb 1998 Russell King
|
|
*/
|
|
|
|
#define pr_fmt(fmt) fmt
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/affs_hardblocks.h>
|
|
|
|
#include "check.h"
|
|
#include "amiga.h"
|
|
|
|
static __inline__ u32
|
|
checksum_block(__be32 *m, int size)
|
|
{
|
|
u32 sum = 0;
|
|
|
|
while (size--)
|
|
sum += be32_to_cpu(*m++);
|
|
return sum;
|
|
}
|
|
|
|
int amiga_partition(struct parsed_partitions *state)
|
|
{
|
|
Sector sect;
|
|
unsigned char *data;
|
|
struct RigidDiskBlock *rdb;
|
|
struct PartitionBlock *pb;
|
|
int start_sect, nr_sects, blk, part, res = 0;
|
|
int blksize = 1; /* Multiplier for disk block size */
|
|
int slot = 1;
|
|
char b[BDEVNAME_SIZE];
|
|
|
|
for (blk = 0; ; blk++, put_dev_sector(sect)) {
|
|
if (blk == RDB_ALLOCATION_LIMIT)
|
|
goto rdb_done;
|
|
data = read_part_sector(state, blk, §);
|
|
if (!data) {
|
|
if (warn_no_part)
|
|
pr_err("Dev %s: unable to read RDB block %d\n",
|
|
bdevname(state->bdev, b), blk);
|
|
res = -1;
|
|
goto rdb_done;
|
|
}
|
|
if (*(__be32 *)data != cpu_to_be32(IDNAME_RIGIDDISK))
|
|
continue;
|
|
|
|
rdb = (struct RigidDiskBlock *)data;
|
|
if (checksum_block((__be32 *)data, be32_to_cpu(rdb->rdb_SummedLongs) & 0x7F) == 0)
|
|
break;
|
|
/* Try again with 0xdc..0xdf zeroed, Windows might have
|
|
* trashed it.
|
|
*/
|
|
*(__be32 *)(data+0xdc) = 0;
|
|
if (checksum_block((__be32 *)data,
|
|
be32_to_cpu(rdb->rdb_SummedLongs) & 0x7F)==0) {
|
|
pr_err("Trashed word at 0xd0 in block %d ignored in checksum calculation\n",
|
|
blk);
|
|
break;
|
|
}
|
|
|
|
pr_err("Dev %s: RDB in block %d has bad checksum\n",
|
|
bdevname(state->bdev, b), blk);
|
|
}
|
|
|
|
/* blksize is blocks per 512 byte standard block */
|
|
blksize = be32_to_cpu( rdb->rdb_BlockBytes ) / 512;
|
|
|
|
{
|
|
char tmp[7 + 10 + 1 + 1];
|
|
|
|
/* Be more informative */
|
|
snprintf(tmp, sizeof(tmp), " RDSK (%d)", blksize * 512);
|
|
strlcat(state->pp_buf, tmp, PAGE_SIZE);
|
|
}
|
|
blk = be32_to_cpu(rdb->rdb_PartitionList);
|
|
put_dev_sector(sect);
|
|
for (part = 1; blk>0 && part<=16; part++, put_dev_sector(sect)) {
|
|
blk *= blksize; /* Read in terms partition table understands */
|
|
data = read_part_sector(state, blk, §);
|
|
if (!data) {
|
|
if (warn_no_part)
|
|
pr_err("Dev %s: unable to read partition block %d\n",
|
|
bdevname(state->bdev, b), blk);
|
|
res = -1;
|
|
goto rdb_done;
|
|
}
|
|
pb = (struct PartitionBlock *)data;
|
|
blk = be32_to_cpu(pb->pb_Next);
|
|
if (pb->pb_ID != cpu_to_be32(IDNAME_PARTITION))
|
|
continue;
|
|
if (checksum_block((__be32 *)pb, be32_to_cpu(pb->pb_SummedLongs) & 0x7F) != 0 )
|
|
continue;
|
|
|
|
/* Tell Kernel about it */
|
|
|
|
nr_sects = (be32_to_cpu(pb->pb_Environment[10]) + 1 -
|
|
be32_to_cpu(pb->pb_Environment[9])) *
|
|
be32_to_cpu(pb->pb_Environment[3]) *
|
|
be32_to_cpu(pb->pb_Environment[5]) *
|
|
blksize;
|
|
if (!nr_sects)
|
|
continue;
|
|
start_sect = be32_to_cpu(pb->pb_Environment[9]) *
|
|
be32_to_cpu(pb->pb_Environment[3]) *
|
|
be32_to_cpu(pb->pb_Environment[5]) *
|
|
blksize;
|
|
put_partition(state,slot++,start_sect,nr_sects);
|
|
{
|
|
/* Be even more informative to aid mounting */
|
|
char dostype[4];
|
|
char tmp[42];
|
|
|
|
__be32 *dt = (__be32 *)dostype;
|
|
*dt = pb->pb_Environment[16];
|
|
if (dostype[3] < ' ')
|
|
snprintf(tmp, sizeof(tmp), " (%c%c%c^%c)",
|
|
dostype[0], dostype[1],
|
|
dostype[2], dostype[3] + '@' );
|
|
else
|
|
snprintf(tmp, sizeof(tmp), " (%c%c%c%c)",
|
|
dostype[0], dostype[1],
|
|
dostype[2], dostype[3]);
|
|
strlcat(state->pp_buf, tmp, PAGE_SIZE);
|
|
snprintf(tmp, sizeof(tmp), "(res %d spb %d)",
|
|
be32_to_cpu(pb->pb_Environment[6]),
|
|
be32_to_cpu(pb->pb_Environment[4]));
|
|
strlcat(state->pp_buf, tmp, PAGE_SIZE);
|
|
}
|
|
res = 1;
|
|
}
|
|
strlcat(state->pp_buf, "\n", PAGE_SIZE);
|
|
|
|
rdb_done:
|
|
return res;
|
|
}
|