tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
16static __inline__ u32
17checksum_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
26int
27amiga_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);
46 goto rdb_done;
47 }
48 if (*(__be32 *)data != cpu_to_be32(IDNAME_RIGIDDISK))
49 continue;
50
51 rdb = (struct RigidDiskBlock *)data;
52 if (checksum_block((__be32 *)data, be32_to_cpu(rdb->rdb_SummedLongs) & 0x7F) == 0)
53 break;
54 /* Try again with 0xdc..0xdf zeroed, Windows might have
55 * trashed it.
56 */
57 *(__be32 *)(data+0xdc) = 0;
58 if (checksum_block((__be32 *)data,
59 be32_to_cpu(rdb->rdb_SummedLongs) & 0x7F)==0) {
60 printk("Warning: Trashed word at 0xd0 in block %d "
61 "ignored in checksum calculation\n",blk);
62 break;
63 }
64
65 printk("Dev %s: RDB in block %d has bad checksum\n",
66 bdevname(bdev, b), blk);
67 }
68
69 /* blksize is blocks per 512 byte standard block */
70 blksize = be32_to_cpu( rdb->rdb_BlockBytes ) / 512;
71
72 printk(" RDSK (%d)", blksize * 512); /* Be more informative */
73 blk = be32_to_cpu(rdb->rdb_PartitionList);
74 put_dev_sector(sect);
75 for (part = 1; blk>0 && part<=16; part++, put_dev_sector(sect)) {
76 blk *= blksize; /* Read in terms partition table understands */
77 data = read_dev_sector(bdev, blk, §);
78 if (!data) {
79 if (warn_no_part)
80 printk("Dev %s: unable to read partition block %d\n",
81 bdevname(bdev, b), blk);
82 goto rdb_done;
83 }
84 pb = (struct PartitionBlock *)data;
85 blk = be32_to_cpu(pb->pb_Next);
86 if (pb->pb_ID != cpu_to_be32(IDNAME_PARTITION))
87 continue;
88 if (checksum_block((__be32 *)pb, be32_to_cpu(pb->pb_SummedLongs) & 0x7F) != 0 )
89 continue;
90
91 /* Tell Kernel about it */
92
93 nr_sects = (be32_to_cpu(pb->pb_Environment[10]) + 1 -
94 be32_to_cpu(pb->pb_Environment[9])) *
95 be32_to_cpu(pb->pb_Environment[3]) *
96 be32_to_cpu(pb->pb_Environment[5]) *
97 blksize;
98 if (!nr_sects)
99 continue;
100 start_sect = be32_to_cpu(pb->pb_Environment[9]) *
101 be32_to_cpu(pb->pb_Environment[3]) *
102 be32_to_cpu(pb->pb_Environment[5]) *
103 blksize;
104 put_partition(state,slot++,start_sect,nr_sects);
105 {
106 /* Be even more informative to aid mounting */
107 char dostype[4];
108 __be32 *dt = (__be32 *)dostype;
109 *dt = pb->pb_Environment[16];
110 if (dostype[3] < ' ')
111 printk(" (%c%c%c^%c)",
112 dostype[0], dostype[1],
113 dostype[2], dostype[3] + '@' );
114 else
115 printk(" (%c%c%c%c)",
116 dostype[0], dostype[1],
117 dostype[2], dostype[3]);
118 printk("(res %d spb %d)",
119 be32_to_cpu(pb->pb_Environment[6]),
120 be32_to_cpu(pb->pb_Environment[4]));
121 }
122 res = 1;
123 }
124 printk("\n");
125
126rdb_done:
127 return res;
128}