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 26 int amiga_partition(struct parsed_partitions *state) 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; 40 data = read_part_sector(state, blk, §); 41 if (!data) { 42 if (warn_no_part) 43 printk("Dev %s: unable to read RDB block %d\n", 44 bdevname(state->bdev, b), blk); 45 res = -1; 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", 66 bdevname(state->bdev, b), blk); 67 } 68 69 /* blksize is blocks per 512 byte standard block */ 70 blksize = be32_to_cpu( rdb->rdb_BlockBytes ) / 512; 71 72 { 73 char tmp[7 + 10 + 1 + 1]; 74 75 /* Be more informative */ 76 snprintf(tmp, sizeof(tmp), " RDSK (%d)", blksize * 512); 77 strlcat(state->pp_buf, tmp, PAGE_SIZE); 78 } 79 blk = be32_to_cpu(rdb->rdb_PartitionList); 80 put_dev_sector(sect); 81 for (part = 1; blk>0 && part<=16; part++, put_dev_sector(sect)) { 82 blk *= blksize; /* Read in terms partition table understands */ 83 data = read_part_sector(state, blk, §); 84 if (!data) { 85 if (warn_no_part) 86 printk("Dev %s: unable to read partition block %d\n", 87 bdevname(state->bdev, b), blk); 88 res = -1; 89 goto rdb_done; 90 } 91 pb = (struct PartitionBlock *)data; 92 blk = be32_to_cpu(pb->pb_Next); 93 if (pb->pb_ID != cpu_to_be32(IDNAME_PARTITION)) 94 continue; 95 if (checksum_block((__be32 *)pb, be32_to_cpu(pb->pb_SummedLongs) & 0x7F) != 0 ) 96 continue; 97 98 /* Tell Kernel about it */ 99 100 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]) * 104 blksize; 105 if (!nr_sects) 106 continue; 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]) * 110 blksize; 111 put_partition(state,slot++,start_sect,nr_sects); 112 { 113 /* Be even more informative to aid mounting */ 114 char dostype[4]; 115 char tmp[42]; 116 117 __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] + '@' ); 123 else 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); 132 } 133 res = 1; 134 } 135 strlcat(state->pp_buf, "\n", PAGE_SIZE); 136 137 rdb_done: 138 return res; 139 } 140