2 * fs/partitions/amiga.c
4 * Code extracted from drivers/block/genhd.c
6 * Copyright (C) 1991-1998 Linus Torvalds
7 * Re-organised Feb 1998 Russell King
10 #include <linux/types.h>
11 #include <linux/affs_hardblocks.h>
17 checksum_block(__be32
*m
, int size
)
22 sum
+= be32_to_cpu(*m
++);
27 amiga_partition(struct parsed_partitions
*state
, struct block_device
*bdev
)
31 struct RigidDiskBlock
*rdb
;
32 struct PartitionBlock
*pb
;
33 int start_sect
, nr_sects
, blk
, part
, res
= 0;
34 int blksize
= 1; /* Multiplier for disk block size */
36 char b
[BDEVNAME_SIZE
];
38 for (blk
= 0; ; blk
++, put_dev_sector(sect
)) {
39 if (blk
== RDB_ALLOCATION_LIMIT
)
41 data
= read_dev_sector(bdev
, blk
, §
);
44 printk("Dev %s: unable to read RDB block %d\n",
45 bdevname(bdev
, b
), blk
);
49 if (*(__be32
*)data
!= cpu_to_be32(IDNAME_RIGIDDISK
))
52 rdb
= (struct RigidDiskBlock
*)data
;
53 if (checksum_block((__be32
*)data
, be32_to_cpu(rdb
->rdb_SummedLongs
) & 0x7F) == 0)
55 /* Try again with 0xdc..0xdf zeroed, Windows might have
58 *(__be32
*)(data
+0xdc) = 0;
59 if (checksum_block((__be32
*)data
,
60 be32_to_cpu(rdb
->rdb_SummedLongs
) & 0x7F)==0) {
61 printk("Warning: Trashed word at 0xd0 in block %d "
62 "ignored in checksum calculation\n",blk
);
66 printk("Dev %s: RDB in block %d has bad checksum\n",
67 bdevname(bdev
, b
), blk
);
70 /* blksize is blocks per 512 byte standard block */
71 blksize
= be32_to_cpu( rdb
->rdb_BlockBytes
) / 512;
73 printk(" RDSK (%d)", blksize
* 512); /* Be more informative */
74 blk
= be32_to_cpu(rdb
->rdb_PartitionList
);
76 for (part
= 1; blk
>0 && part
<=16; part
++, put_dev_sector(sect
)) {
77 blk
*= blksize
; /* Read in terms partition table understands */
78 data
= read_dev_sector(bdev
, blk
, §
);
81 printk("Dev %s: unable to read partition block %d\n",
82 bdevname(bdev
, b
), blk
);
86 pb
= (struct PartitionBlock
*)data
;
87 blk
= be32_to_cpu(pb
->pb_Next
);
88 if (pb
->pb_ID
!= cpu_to_be32(IDNAME_PARTITION
))
90 if (checksum_block((__be32
*)pb
, be32_to_cpu(pb
->pb_SummedLongs
) & 0x7F) != 0 )
93 /* Tell Kernel about it */
95 nr_sects
= (be32_to_cpu(pb
->pb_Environment
[10]) + 1 -
96 be32_to_cpu(pb
->pb_Environment
[9])) *
97 be32_to_cpu(pb
->pb_Environment
[3]) *
98 be32_to_cpu(pb
->pb_Environment
[5]) *
102 start_sect
= be32_to_cpu(pb
->pb_Environment
[9]) *
103 be32_to_cpu(pb
->pb_Environment
[3]) *
104 be32_to_cpu(pb
->pb_Environment
[5]) *
106 put_partition(state
,slot
++,start_sect
,nr_sects
);
108 /* Be even more informative to aid mounting */
110 __be32
*dt
= (__be32
*)dostype
;
111 *dt
= pb
->pb_Environment
[16];
112 if (dostype
[3] < ' ')
113 printk(" (%c%c%c^%c)",
114 dostype
[0], dostype
[1],
115 dostype
[2], dostype
[3] + '@' );
117 printk(" (%c%c%c%c)",
118 dostype
[0], dostype
[1],
119 dostype
[2], dostype
[3]);
120 printk("(res %d spb %d)",
121 be32_to_cpu(pb
->pb_Environment
[6]),
122 be32_to_cpu(pb
->pb_Environment
[4]));
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