Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * fs/partitions/amiga.c | |
3 | * | |
4 | * Code extracted from drivers/block/genhd.c | |
5 | * | |
6 | * Copyright (C) 1991-1998 Linus Torvalds | |
7 | * Re-organised Feb 1998 Russell King | |
8 | */ | |
9 | ||
10 | #include <linux/types.h> | |
11 | #include <linux/affs_hardblocks.h> | |
12 | ||
13 | #include "check.h" | |
14 | #include "amiga.h" | |
15 | ||
16 | static __inline__ u32 | |
17 | checksum_block(__be32 *m, int size) | |
18 | { | |
19 | u32 sum = 0; | |
20 | ||
21 | while (size--) | |
22 | sum += be32_to_cpu(*m++); | |
23 | return sum; | |
24 | } | |
25 | ||
26 | int | |
27 | amiga_partition(struct parsed_partitions *state, struct block_device *bdev) | |
28 | { | |
29 | Sector sect; | |
30 | unsigned char *data; | |
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 */ | |
35 | int slot = 1; | |
36 | char b[BDEVNAME_SIZE]; | |
37 | ||
38 | for (blk = 0; ; blk++, put_dev_sector(sect)) { | |
39 | if (blk == RDB_ALLOCATION_LIMIT) | |
40 | goto rdb_done; | |
41 | data = read_dev_sector(bdev, blk, §); | |
42 | if (!data) { | |
43 | if (warn_no_part) | |
44 | printk("Dev %s: unable to read RDB block %d\n", | |
45 | bdevname(bdev, b), blk); | |
57881dd9 | 46 | res = -1; |
1da177e4 LT |
47 | goto rdb_done; |
48 | } | |
49 | if (*(__be32 *)data != cpu_to_be32(IDNAME_RIGIDDISK)) | |
50 | continue; | |
51 | ||
52 | rdb = (struct RigidDiskBlock *)data; | |
53 | if (checksum_block((__be32 *)data, be32_to_cpu(rdb->rdb_SummedLongs) & 0x7F) == 0) | |
54 | break; | |
55 | /* Try again with 0xdc..0xdf zeroed, Windows might have | |
56 | * trashed it. | |
57 | */ | |
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); | |
63 | break; | |
64 | } | |
65 | ||
66 | printk("Dev %s: RDB in block %d has bad checksum\n", | |
67 | bdevname(bdev, b), blk); | |
68 | } | |
69 | ||
70 | /* blksize is blocks per 512 byte standard block */ | |
71 | blksize = be32_to_cpu( rdb->rdb_BlockBytes ) / 512; | |
72 | ||
73 | printk(" RDSK (%d)", blksize * 512); /* Be more informative */ | |
74 | blk = be32_to_cpu(rdb->rdb_PartitionList); | |
75 | put_dev_sector(sect); | |
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, §); | |
79 | if (!data) { | |
80 | if (warn_no_part) | |
81 | printk("Dev %s: unable to read partition block %d\n", | |
82 | bdevname(bdev, b), blk); | |
57881dd9 | 83 | res = -1; |
1da177e4 LT |
84 | goto rdb_done; |
85 | } | |
86 | pb = (struct PartitionBlock *)data; | |
87 | blk = be32_to_cpu(pb->pb_Next); | |
88 | if (pb->pb_ID != cpu_to_be32(IDNAME_PARTITION)) | |
89 | continue; | |
90 | if (checksum_block((__be32 *)pb, be32_to_cpu(pb->pb_SummedLongs) & 0x7F) != 0 ) | |
91 | continue; | |
92 | ||
93 | /* Tell Kernel about it */ | |
94 | ||
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]) * | |
99 | blksize; | |
100 | if (!nr_sects) | |
101 | continue; | |
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]) * | |
105 | blksize; | |
106 | put_partition(state,slot++,start_sect,nr_sects); | |
107 | { | |
108 | /* Be even more informative to aid mounting */ | |
109 | char dostype[4]; | |
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] + '@' ); | |
116 | else | |
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])); | |
123 | } | |
124 | res = 1; | |
125 | } | |
126 | printk("\n"); | |
127 | ||
128 | rdb_done: | |
129 | return res; | |
130 | } |