diff options
Diffstat (limited to 'fs/partitions/amiga.c')
| -rw-r--r-- | fs/partitions/amiga.c | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/fs/partitions/amiga.c b/fs/partitions/amiga.c new file mode 100644 index 0000000..3068528 --- /dev/null +++ b/fs/partitions/amiga.c @@ -0,0 +1,128 @@ +/* + * fs/partitions/amiga.c + * + * Code extracted from drivers/block/genhd.c + * + * Copyright (C) 1991-1998 Linus Torvalds + * Re-organised Feb 1998 Russell King + */ + +#include <linux/types.h> +#include <linux/affs_hardblocks.h> + +#include "check.h" +#include "amiga.h" + +static __inline__ u32 +checksum_block(__be32 *m, int size) +{ + u32 sum = 0; + + while (size--) + sum += be32_to_cpu(*m++); + return sum; +} + +int +amiga_partition(struct parsed_partitions *state, struct block_device *bdev) +{ + Sector sect; + unsigned char *data; + struct RigidDiskBlock *rdb; + struct PartitionBlock *pb; + int start_sect, nr_sects, blk, part, res = 0; + int blksize = 1; /* Multiplier for disk block size */ + int slot = 1; + char b[BDEVNAME_SIZE]; + + for (blk = 0; ; blk++, put_dev_sector(sect)) { + if (blk == RDB_ALLOCATION_LIMIT) + goto rdb_done; + data = read_dev_sector(bdev, blk, §); + if (!data) { + if (warn_no_part) + printk("Dev %s: unable to read RDB block %d\n", + bdevname(bdev, b), blk); + goto rdb_done; + } + if (*(__be32 *)data != cpu_to_be32(IDNAME_RIGIDDISK)) + continue; + + rdb = (struct RigidDiskBlock *)data; + if (checksum_block((__be32 *)data, be32_to_cpu(rdb->rdb_SummedLongs) & 0x7F) == 0) + break; + /* Try again with 0xdc..0xdf zeroed, Windows might have + * trashed it. + */ + *(__be32 *)(data+0xdc) = 0; + if (checksum_block((__be32 *)data, + be32_to_cpu(rdb->rdb_SummedLongs) & 0x7F)==0) { + printk("Warning: Trashed word at 0xd0 in block %d " + "ignored in checksum calculation\n",blk); + break; + } + + printk("Dev %s: RDB in block %d has bad checksum\n", + bdevname(bdev, b), blk); + } + + /* blksize is blocks per 512 byte standard block */ + blksize = be32_to_cpu( rdb->rdb_BlockBytes ) / 512; + + printk(" RDSK (%d)", blksize * 512); /* Be more informative */ + blk = be32_to_cpu(rdb->rdb_PartitionList); + put_dev_sector(sect); + for (part = 1; blk>0 && part<=16; part++, put_dev_sector(sect)) { + blk *= blksize; /* Read in terms partition table understands */ + data = read_dev_sector(bdev, blk, §); + if (!data) { + if (warn_no_part) + printk("Dev %s: unable to read partition block %d\n", + bdevname(bdev, b), blk); + goto rdb_done; + } + pb = (struct PartitionBlock *)data; + blk = be32_to_cpu(pb->pb_Next); + if (pb->pb_ID != cpu_to_be32(IDNAME_PARTITION)) + continue; + if (checksum_block((__be32 *)pb, be32_to_cpu(pb->pb_SummedLongs) & 0x7F) != 0 ) + continue; + + /* Tell Kernel about it */ + + nr_sects = (be32_to_cpu(pb->pb_Environment[10]) + 1 - + be32_to_cpu(pb->pb_Environment[9])) * + be32_to_cpu(pb->pb_Environment[3]) * + be32_to_cpu(pb->pb_Environment[5]) * + blksize; + if (!nr_sects) + continue; + start_sect = be32_to_cpu(pb->pb_Environment[9]) * + be32_to_cpu(pb->pb_Environment[3]) * + be32_to_cpu(pb->pb_Environment[5]) * + blksize; + put_partition(state,slot++,start_sect,nr_sects); + { + /* Be even more informative to aid mounting */ + char dostype[4]; + __be32 *dt = (__be32 *)dostype; + *dt = pb->pb_Environment[16]; + if (dostype[3] < ' ') + printk(" (%c%c%c^%c)", + dostype[0], dostype[1], + dostype[2], dostype[3] + '@' ); + else + printk(" (%c%c%c%c)", + dostype[0], dostype[1], + dostype[2], dostype[3]); + printk("(res %d spb %d)", + be32_to_cpu(pb->pb_Environment[6]), + be32_to_cpu(pb->pb_Environment[4])); + } + res = 1; + } + printk("\n"); + +rdb_done: + return res; +} |
