Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
| 16 | static __inline__ u32 |
| 17 | checksum_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 | |
Tejun Heo | 1493bf2 | 2010-05-15 20:09:30 +0200 | [diff] [blame] | 26 | int amiga_partition(struct parsed_partitions *state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | { |
| 28 | Sector sect; |
| 29 | unsigned char *data; |
| 30 | struct RigidDiskBlock *rdb; |
| 31 | struct PartitionBlock *pb; |
| 32 | int start_sect, nr_sects, blk, part, res = 0; |
| 33 | int blksize = 1; /* Multiplier for disk block size */ |
| 34 | int slot = 1; |
| 35 | char b[BDEVNAME_SIZE]; |
| 36 | |
| 37 | for (blk = 0; ; blk++, put_dev_sector(sect)) { |
| 38 | if (blk == RDB_ALLOCATION_LIMIT) |
| 39 | goto rdb_done; |
Tejun Heo | 1493bf2 | 2010-05-15 20:09:30 +0200 | [diff] [blame] | 40 | data = read_part_sector(state, blk, §); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | if (!data) { |
| 42 | if (warn_no_part) |
| 43 | printk("Dev %s: unable to read RDB block %d\n", |
Tejun Heo | 1493bf2 | 2010-05-15 20:09:30 +0200 | [diff] [blame] | 44 | bdevname(state->bdev, b), blk); |
Suzuki K P | 57881dd | 2006-12-06 20:35:16 -0800 | [diff] [blame] | 45 | res = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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", |
Tejun Heo | 1493bf2 | 2010-05-15 20:09:30 +0200 | [diff] [blame] | 66 | bdevname(state->bdev, b), blk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 */ |
Tejun Heo | 1493bf2 | 2010-05-15 20:09:30 +0200 | [diff] [blame] | 77 | data = read_part_sector(state, blk, §); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | if (!data) { |
| 79 | if (warn_no_part) |
| 80 | printk("Dev %s: unable to read partition block %d\n", |
Tejun Heo | 1493bf2 | 2010-05-15 20:09:30 +0200 | [diff] [blame] | 81 | bdevname(state->bdev, b), blk); |
Suzuki K P | 57881dd | 2006-12-06 20:35:16 -0800 | [diff] [blame] | 82 | res = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | goto rdb_done; |
| 84 | } |
| 85 | pb = (struct PartitionBlock *)data; |
| 86 | blk = be32_to_cpu(pb->pb_Next); |
| 87 | if (pb->pb_ID != cpu_to_be32(IDNAME_PARTITION)) |
| 88 | continue; |
| 89 | if (checksum_block((__be32 *)pb, be32_to_cpu(pb->pb_SummedLongs) & 0x7F) != 0 ) |
| 90 | continue; |
| 91 | |
| 92 | /* Tell Kernel about it */ |
| 93 | |
| 94 | nr_sects = (be32_to_cpu(pb->pb_Environment[10]) + 1 - |
| 95 | be32_to_cpu(pb->pb_Environment[9])) * |
| 96 | be32_to_cpu(pb->pb_Environment[3]) * |
| 97 | be32_to_cpu(pb->pb_Environment[5]) * |
| 98 | blksize; |
| 99 | if (!nr_sects) |
| 100 | continue; |
| 101 | start_sect = be32_to_cpu(pb->pb_Environment[9]) * |
| 102 | be32_to_cpu(pb->pb_Environment[3]) * |
| 103 | be32_to_cpu(pb->pb_Environment[5]) * |
| 104 | blksize; |
| 105 | put_partition(state,slot++,start_sect,nr_sects); |
| 106 | { |
| 107 | /* Be even more informative to aid mounting */ |
| 108 | char dostype[4]; |
| 109 | __be32 *dt = (__be32 *)dostype; |
| 110 | *dt = pb->pb_Environment[16]; |
| 111 | if (dostype[3] < ' ') |
| 112 | printk(" (%c%c%c^%c)", |
| 113 | dostype[0], dostype[1], |
| 114 | dostype[2], dostype[3] + '@' ); |
| 115 | else |
| 116 | printk(" (%c%c%c%c)", |
| 117 | dostype[0], dostype[1], |
| 118 | dostype[2], dostype[3]); |
| 119 | printk("(res %d spb %d)", |
| 120 | be32_to_cpu(pb->pb_Environment[6]), |
| 121 | be32_to_cpu(pb->pb_Environment[4])); |
| 122 | } |
| 123 | res = 1; |
| 124 | } |
| 125 | printk("\n"); |
| 126 | |
| 127 | rdb_done: |
| 128 | return res; |
| 129 | } |