2 * fs/partitions/amiga.c
4 * Code extracted from drivers/block/genhd.c
6 * Copyright (C) 1991-1998 Linus Torvalds
7 * Re-organised Feb 1998 Russell King
10 #include <linux/types.h>
11 #include <linux/affs_hardblocks.h>
17 checksum_block(u32 *m, int size)
22 sum += be32_to_cpu(*m++);
27 amiga_partition(struct parsed_partitions *state, struct block_device *bdev)
31 struct RigidDiskBlock *rdb;
32 struct PartitionBlock *pb;
33 int start_sect, nr_sects, blk, part, res = 0;
35 char b[BDEVNAME_SIZE];
37 for (blk = 0; ; blk++, put_dev_sector(sect)) {
38 if (blk == RDB_ALLOCATION_LIMIT)
40 data = read_dev_sector(bdev, blk, §);
43 printk("Dev %s: unable to read RDB block %d\n",
44 bdevname(bdev, b), blk);
47 if (*(u32 *)data != cpu_to_be32(IDNAME_RIGIDDISK))
50 rdb = (struct RigidDiskBlock *)data;
51 if (checksum_block((u32 *)data, be32_to_cpu(rdb->rdb_SummedLongs) & 0x7F) == 0)
53 /* Try again with 0xdc..0xdf zeroed, Windows might have
56 *(u32 *)(data+0xdc) = 0;
57 if (checksum_block((u32 *)data,
58 be32_to_cpu(rdb->rdb_SummedLongs) & 0x7F)==0) {
59 printk("Warning: Trashed word at 0xd0 in block %d "
60 "ignored in checksum calculation\n",blk);
64 printk("Dev %s: RDB in block %d has bad checksum\n",
65 bdevname(bdev, b), blk);
69 blk = be32_to_cpu(rdb->rdb_PartitionList);
71 for (part = 1; blk>0 && part<=16; part++, put_dev_sector(sect)) {
72 data = read_dev_sector(bdev, blk, §);
75 printk("Dev %s: unable to read partition block %d\n",
76 bdevname(bdev, b), blk);
79 pb = (struct PartitionBlock *)data;
80 blk = be32_to_cpu(pb->pb_Next);
81 if (pb->pb_ID != cpu_to_be32(IDNAME_PARTITION))
83 if (checksum_block((u32 *)pb, be32_to_cpu(pb->pb_SummedLongs) & 0x7F) != 0 )
86 /* Tell Kernel about it */
88 nr_sects = (be32_to_cpu(pb->pb_Environment[10]) + 1 -
89 be32_to_cpu(pb->pb_Environment[9])) *
90 be32_to_cpu(pb->pb_Environment[3]) *
91 be32_to_cpu(pb->pb_Environment[5]);
94 start_sect = be32_to_cpu(pb->pb_Environment[9]) *
95 be32_to_cpu(pb->pb_Environment[3]) *
96 be32_to_cpu(pb->pb_Environment[5]);
97 put_partition(state,slot++,start_sect,nr_sects);