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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * fs/partitions/amiga.c
4 *
5 * Code extracted from drivers/block/genhd.c
6 *
7 * Copyright (C) 1991-1998 Linus Torvalds
8 * Re-organised Feb 1998 Russell King
9 */
10
11#define pr_fmt(fmt) fmt
12
13#include <linux/types.h>
14#include <linux/affs_hardblocks.h>
15
16#include "check.h"
17#include "amiga.h"
18
19static __inline__ u32
20checksum_block(__be32 *m, int size)
21{
22 u32 sum = 0;
23
24 while (size--)
25 sum += be32_to_cpu(*m++);
26 return sum;
27}
28
29int amiga_partition(struct parsed_partitions *state)
30{
31 Sector sect;
32 unsigned char *data;
33 struct RigidDiskBlock *rdb;
34 struct PartitionBlock *pb;
35 int start_sect, nr_sects, blk, part, res = 0;
36 int blksize = 1; /* Multiplier for disk block size */
37 int slot = 1;
38 char b[BDEVNAME_SIZE];
39
40 for (blk = 0; ; blk++, put_dev_sector(sect)) {
41 if (blk == RDB_ALLOCATION_LIMIT)
42 goto rdb_done;
43 data = read_part_sector(state, blk, §);
44 if (!data) {
45 if (warn_no_part)
46 pr_err("Dev %s: unable to read RDB block %d\n",
47 bdevname(state->bdev, b), blk);
48 res = -1;
49 goto rdb_done;
50 }
51 if (*(__be32 *)data != cpu_to_be32(IDNAME_RIGIDDISK))
52 continue;
53
54 rdb = (struct RigidDiskBlock *)data;
55 if (checksum_block((__be32 *)data, be32_to_cpu(rdb->rdb_SummedLongs) & 0x7F) == 0)
56 break;
57 /* Try again with 0xdc..0xdf zeroed, Windows might have
58 * trashed it.
59 */
60 *(__be32 *)(data+0xdc) = 0;
61 if (checksum_block((__be32 *)data,
62 be32_to_cpu(rdb->rdb_SummedLongs) & 0x7F)==0) {
63 pr_err("Trashed word at 0xd0 in block %d ignored in checksum calculation\n",
64 blk);
65 break;
66 }
67
68 pr_err("Dev %s: RDB in block %d has bad checksum\n",
69 bdevname(state->bdev, b), blk);
70 }
71
72 /* blksize is blocks per 512 byte standard block */
73 blksize = be32_to_cpu( rdb->rdb_BlockBytes ) / 512;
74
75 {
76 char tmp[7 + 10 + 1 + 1];
77
78 /* Be more informative */
79 snprintf(tmp, sizeof(tmp), " RDSK (%d)", blksize * 512);
80 strlcat(state->pp_buf, tmp, PAGE_SIZE);
81 }
82 blk = be32_to_cpu(rdb->rdb_PartitionList);
83 put_dev_sector(sect);
84 for (part = 1; blk>0 && part<=16; part++, put_dev_sector(sect)) {
85 blk *= blksize; /* Read in terms partition table understands */
86 data = read_part_sector(state, blk, §);
87 if (!data) {
88 if (warn_no_part)
89 pr_err("Dev %s: unable to read partition block %d\n",
90 bdevname(state->bdev, b), blk);
91 res = -1;
92 goto rdb_done;
93 }
94 pb = (struct PartitionBlock *)data;
95 blk = be32_to_cpu(pb->pb_Next);
96 if (pb->pb_ID != cpu_to_be32(IDNAME_PARTITION))
97 continue;
98 if (checksum_block((__be32 *)pb, be32_to_cpu(pb->pb_SummedLongs) & 0x7F) != 0 )
99 continue;
100
101 /* Tell Kernel about it */
102
103 nr_sects = (be32_to_cpu(pb->pb_Environment[10]) + 1 -
104 be32_to_cpu(pb->pb_Environment[9])) *
105 be32_to_cpu(pb->pb_Environment[3]) *
106 be32_to_cpu(pb->pb_Environment[5]) *
107 blksize;
108 if (!nr_sects)
109 continue;
110 start_sect = be32_to_cpu(pb->pb_Environment[9]) *
111 be32_to_cpu(pb->pb_Environment[3]) *
112 be32_to_cpu(pb->pb_Environment[5]) *
113 blksize;
114 put_partition(state,slot++,start_sect,nr_sects);
115 {
116 /* Be even more informative to aid mounting */
117 char dostype[4];
118 char tmp[42];
119
120 __be32 *dt = (__be32 *)dostype;
121 *dt = pb->pb_Environment[16];
122 if (dostype[3] < ' ')
123 snprintf(tmp, sizeof(tmp), " (%c%c%c^%c)",
124 dostype[0], dostype[1],
125 dostype[2], dostype[3] + '@' );
126 else
127 snprintf(tmp, sizeof(tmp), " (%c%c%c%c)",
128 dostype[0], dostype[1],
129 dostype[2], dostype[3]);
130 strlcat(state->pp_buf, tmp, PAGE_SIZE);
131 snprintf(tmp, sizeof(tmp), "(res %d spb %d)",
132 be32_to_cpu(pb->pb_Environment[6]),
133 be32_to_cpu(pb->pb_Environment[4]));
134 strlcat(state->pp_buf, tmp, PAGE_SIZE);
135 }
136 res = 1;
137 }
138 strlcat(state->pp_buf, "\n", PAGE_SIZE);
139
140rdb_done:
141 return res;
142}
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#define pr_fmt(fmt) fmt
11
12#include <linux/types.h>
13#include <linux/affs_hardblocks.h>
14
15#include "check.h"
16#include "amiga.h"
17
18static __inline__ u32
19checksum_block(__be32 *m, int size)
20{
21 u32 sum = 0;
22
23 while (size--)
24 sum += be32_to_cpu(*m++);
25 return sum;
26}
27
28int amiga_partition(struct parsed_partitions *state)
29{
30 Sector sect;
31 unsigned char *data;
32 struct RigidDiskBlock *rdb;
33 struct PartitionBlock *pb;
34 int start_sect, nr_sects, blk, part, res = 0;
35 int blksize = 1; /* Multiplier for disk block size */
36 int slot = 1;
37 char b[BDEVNAME_SIZE];
38
39 for (blk = 0; ; blk++, put_dev_sector(sect)) {
40 if (blk == RDB_ALLOCATION_LIMIT)
41 goto rdb_done;
42 data = read_part_sector(state, blk, §);
43 if (!data) {
44 if (warn_no_part)
45 pr_err("Dev %s: unable to read RDB block %d\n",
46 bdevname(state->bdev, b), blk);
47 res = -1;
48 goto rdb_done;
49 }
50 if (*(__be32 *)data != cpu_to_be32(IDNAME_RIGIDDISK))
51 continue;
52
53 rdb = (struct RigidDiskBlock *)data;
54 if (checksum_block((__be32 *)data, be32_to_cpu(rdb->rdb_SummedLongs) & 0x7F) == 0)
55 break;
56 /* Try again with 0xdc..0xdf zeroed, Windows might have
57 * trashed it.
58 */
59 *(__be32 *)(data+0xdc) = 0;
60 if (checksum_block((__be32 *)data,
61 be32_to_cpu(rdb->rdb_SummedLongs) & 0x7F)==0) {
62 pr_err("Trashed word at 0xd0 in block %d ignored in checksum calculation\n",
63 blk);
64 break;
65 }
66
67 pr_err("Dev %s: RDB in block %d has bad checksum\n",
68 bdevname(state->bdev, b), blk);
69 }
70
71 /* blksize is blocks per 512 byte standard block */
72 blksize = be32_to_cpu( rdb->rdb_BlockBytes ) / 512;
73
74 {
75 char tmp[7 + 10 + 1 + 1];
76
77 /* Be more informative */
78 snprintf(tmp, sizeof(tmp), " RDSK (%d)", blksize * 512);
79 strlcat(state->pp_buf, tmp, PAGE_SIZE);
80 }
81 blk = be32_to_cpu(rdb->rdb_PartitionList);
82 put_dev_sector(sect);
83 for (part = 1; blk>0 && part<=16; part++, put_dev_sector(sect)) {
84 blk *= blksize; /* Read in terms partition table understands */
85 data = read_part_sector(state, blk, §);
86 if (!data) {
87 if (warn_no_part)
88 pr_err("Dev %s: unable to read partition block %d\n",
89 bdevname(state->bdev, b), blk);
90 res = -1;
91 goto rdb_done;
92 }
93 pb = (struct PartitionBlock *)data;
94 blk = be32_to_cpu(pb->pb_Next);
95 if (pb->pb_ID != cpu_to_be32(IDNAME_PARTITION))
96 continue;
97 if (checksum_block((__be32 *)pb, be32_to_cpu(pb->pb_SummedLongs) & 0x7F) != 0 )
98 continue;
99
100 /* Tell Kernel about it */
101
102 nr_sects = (be32_to_cpu(pb->pb_Environment[10]) + 1 -
103 be32_to_cpu(pb->pb_Environment[9])) *
104 be32_to_cpu(pb->pb_Environment[3]) *
105 be32_to_cpu(pb->pb_Environment[5]) *
106 blksize;
107 if (!nr_sects)
108 continue;
109 start_sect = be32_to_cpu(pb->pb_Environment[9]) *
110 be32_to_cpu(pb->pb_Environment[3]) *
111 be32_to_cpu(pb->pb_Environment[5]) *
112 blksize;
113 put_partition(state,slot++,start_sect,nr_sects);
114 {
115 /* Be even more informative to aid mounting */
116 char dostype[4];
117 char tmp[42];
118
119 __be32 *dt = (__be32 *)dostype;
120 *dt = pb->pb_Environment[16];
121 if (dostype[3] < ' ')
122 snprintf(tmp, sizeof(tmp), " (%c%c%c^%c)",
123 dostype[0], dostype[1],
124 dostype[2], dostype[3] + '@' );
125 else
126 snprintf(tmp, sizeof(tmp), " (%c%c%c%c)",
127 dostype[0], dostype[1],
128 dostype[2], dostype[3]);
129 strlcat(state->pp_buf, tmp, PAGE_SIZE);
130 snprintf(tmp, sizeof(tmp), "(res %d spb %d)",
131 be32_to_cpu(pb->pb_Environment[6]),
132 be32_to_cpu(pb->pb_Environment[4]));
133 strlcat(state->pp_buf, tmp, PAGE_SIZE);
134 }
135 res = 1;
136 }
137 strlcat(state->pp_buf, "\n", PAGE_SIZE);
138
139rdb_done:
140 return res;
141}