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>
20 checksum_block(__be32 *m, int size)
25 sum += be32_to_cpu(*m++);
29 int amiga_partition(struct parsed_partitions *state)
33 struct RigidDiskBlock *rdb;
34 struct PartitionBlock *pb;
35 sector_t start_sect, nr_sects;
36 int blk, part, res = 0;
37 int blksize = 1; /* Multiplier for disk block size */
39 char b[BDEVNAME_SIZE];
41 for (blk = 0; ; blk++, put_dev_sector(sect)) {
42 if (blk == RDB_ALLOCATION_LIMIT)
44 data = read_part_sector(state, blk, §);
47 pr_err("Dev %s: unable to read RDB block %d\n",
48 bdevname(state->bdev, b), blk);
52 if (*(__be32 *)data != cpu_to_be32(IDNAME_RIGIDDISK))
55 rdb = (struct RigidDiskBlock *)data;
56 if (checksum_block((__be32 *)data, be32_to_cpu(rdb->rdb_SummedLongs) & 0x7F) == 0)
58 /* Try again with 0xdc..0xdf zeroed, Windows might have
61 *(__be32 *)(data+0xdc) = 0;
62 if (checksum_block((__be32 *)data,
63 be32_to_cpu(rdb->rdb_SummedLongs) & 0x7F)==0) {
64 pr_err("Trashed word at 0xd0 in block %d ignored in checksum calculation\n",
69 pr_err("Dev %s: RDB in block %d has bad checksum\n",
70 bdevname(state->bdev, b), blk);
73 /* blksize is blocks per 512 byte standard block */
74 blksize = be32_to_cpu( rdb->rdb_BlockBytes ) / 512;
77 char tmp[7 + 10 + 1 + 1];
79 /* Be more informative */
80 snprintf(tmp, sizeof(tmp), " RDSK (%d)", blksize * 512);
81 strlcat(state->pp_buf, tmp, PAGE_SIZE);
83 blk = be32_to_cpu(rdb->rdb_PartitionList);
85 for (part = 1; blk>0 && part<=16; part++, put_dev_sector(sect)) {
86 blk *= blksize; /* Read in terms partition table understands */
87 data = read_part_sector(state, blk, §);
90 pr_err("Dev %s: unable to read partition block %d\n",
91 bdevname(state->bdev, b), blk);
95 pb = (struct PartitionBlock *)data;
96 blk = be32_to_cpu(pb->pb_Next);
97 if (pb->pb_ID != cpu_to_be32(IDNAME_PARTITION))
99 if (checksum_block((__be32 *)pb, be32_to_cpu(pb->pb_SummedLongs) & 0x7F) != 0 )
102 /* Tell Kernel about it */
104 nr_sects = ((sector_t)be32_to_cpu(pb->pb_Environment[10]) + 1 -
105 be32_to_cpu(pb->pb_Environment[9])) *
106 be32_to_cpu(pb->pb_Environment[3]) *
107 be32_to_cpu(pb->pb_Environment[5]) *
111 start_sect = (sector_t)be32_to_cpu(pb->pb_Environment[9]) *
112 be32_to_cpu(pb->pb_Environment[3]) *
113 be32_to_cpu(pb->pb_Environment[5]) *
115 put_partition(state,slot++,start_sect,nr_sects);
117 /* Be even more informative to aid mounting */
121 __be32 *dt = (__be32 *)dostype;
122 *dt = pb->pb_Environment[16];
123 if (dostype[3] < ' ')
124 snprintf(tmp, sizeof(tmp), " (%c%c%c^%c)",
125 dostype[0], dostype[1],
126 dostype[2], dostype[3] + '@' );
128 snprintf(tmp, sizeof(tmp), " (%c%c%c%c)",
129 dostype[0], dostype[1],
130 dostype[2], dostype[3]);
131 strlcat(state->pp_buf, tmp, PAGE_SIZE);
132 snprintf(tmp, sizeof(tmp), "(res %d spb %d)",
133 be32_to_cpu(pb->pb_Environment[6]),
134 be32_to_cpu(pb->pb_Environment[4]));
135 strlcat(state->pp_buf, tmp, PAGE_SIZE);
139 strlcat(state->pp_buf, "\n", PAGE_SIZE);