1 // SPDX-License-Identifier: GPL-2.0
3 * fs/partitions/amiga.c
5 * Code extracted from drivers/block/genhd.c
7 * Copyright (C) 1991-1998 Linus Torvalds
8 * Re-organised Feb 1998 Russell King
11 #define pr_fmt(fmt) fmt
13 #include <linux/types.h>
14 #include <linux/affs_hardblocks.h>
19 checksum_block(__be32 *m, int size)
24 sum += be32_to_cpu(*m++);
28 int amiga_partition(struct parsed_partitions *state)
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 */
37 char b[BDEVNAME_SIZE];
39 for (blk = 0; ; blk++, put_dev_sector(sect)) {
40 if (blk == RDB_ALLOCATION_LIMIT)
42 data = read_part_sector(state, blk, §);
44 pr_err("Dev %s: unable to read RDB block %d\n",
45 bdevname(state->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 pr_err("Trashed word at 0xd0 in block %d ignored in checksum calculation\n",
66 pr_err("Dev %s: RDB in block %d has bad checksum\n",
67 bdevname(state->bdev, b), blk);
70 /* blksize is blocks per 512 byte standard block */
71 blksize = be32_to_cpu( rdb->rdb_BlockBytes ) / 512;
74 char tmp[7 + 10 + 1 + 1];
76 /* Be more informative */
77 snprintf(tmp, sizeof(tmp), " RDSK (%d)", blksize * 512);
78 strlcat(state->pp_buf, tmp, PAGE_SIZE);
80 blk = be32_to_cpu(rdb->rdb_PartitionList);
82 for (part = 1; blk>0 && part<=16; part++, put_dev_sector(sect)) {
83 blk *= blksize; /* Read in terms partition table understands */
84 data = read_part_sector(state, blk, §);
86 pr_err("Dev %s: unable to read partition block %d\n",
87 bdevname(state->bdev, b), blk);
91 pb = (struct PartitionBlock *)data;
92 blk = be32_to_cpu(pb->pb_Next);
93 if (pb->pb_ID != cpu_to_be32(IDNAME_PARTITION))
95 if (checksum_block((__be32 *)pb, be32_to_cpu(pb->pb_SummedLongs) & 0x7F) != 0 )
98 /* Tell Kernel about it */
100 nr_sects = (be32_to_cpu(pb->pb_Environment[10]) + 1 -
101 be32_to_cpu(pb->pb_Environment[9])) *
102 be32_to_cpu(pb->pb_Environment[3]) *
103 be32_to_cpu(pb->pb_Environment[5]) *
107 start_sect = be32_to_cpu(pb->pb_Environment[9]) *
108 be32_to_cpu(pb->pb_Environment[3]) *
109 be32_to_cpu(pb->pb_Environment[5]) *
111 put_partition(state,slot++,start_sect,nr_sects);
113 /* Be even more informative to aid mounting */
117 __be32 *dt = (__be32 *)dostype;
118 *dt = pb->pb_Environment[16];
119 if (dostype[3] < ' ')
120 snprintf(tmp, sizeof(tmp), " (%c%c%c^%c)",
121 dostype[0], dostype[1],
122 dostype[2], dostype[3] + '@' );
124 snprintf(tmp, sizeof(tmp), " (%c%c%c%c)",
125 dostype[0], dostype[1],
126 dostype[2], dostype[3]);
127 strlcat(state->pp_buf, tmp, PAGE_SIZE);
128 snprintf(tmp, sizeof(tmp), "(res %d spb %d)",
129 be32_to_cpu(pb->pb_Environment[6]),
130 be32_to_cpu(pb->pb_Environment[4]));
131 strlcat(state->pp_buf, tmp, PAGE_SIZE);
135 strlcat(state->pp_buf, "\n", PAGE_SIZE);