projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 1b731e7b | 1 | /* ffs_tables.c 2.3 82/07/15 */ |
| 5576d804 KM |
2 | |
| 3 | #include "../h/param.h" | |
| 4 | ||
| 5576d804 KM |
5 | /* |
| 6 | * bit patterns for identifying fragments in the block map | |
| 7 | * used as ((map & around) == inside) | |
| 8 | */ | |
| 9 | int around[9] = { | |
| 10 | 0x3, 0x7, 0xf, 0x1f, 0x3f, 0x7f, 0xff, 0x1ff, 0x3ff | |
| 11 | }; | |
| 12 | int inside[9] = { | |
| 13 | 0x0, 0x2, 0x6, 0xe, 0x1e, 0x3e, 0x7e, 0xfe, 0x1fe | |
| 14 | }; | |
| 15 | ||
| 16 | /* | |
| b6407c9d | 17 | * given a block map bit pattern, the frag tables tell whether a |
| 5576d804 | 18 | * particular size fragment is available. |
| b6407c9d | 19 | * |
| 5576d804 | 20 | * used as: |
| b6407c9d | 21 | * if ((1 << (size - 1)) & fragtbl[fs->fs_frag][map] { |
| 5576d804 KM |
22 | * at least one fragment of the indicated size is available |
| 23 | * } | |
| b6407c9d KM |
24 | * |
| 25 | * These tables are used by the scanc instruction on the VAX to | |
| 5576d804 KM |
26 | * quickly find an appropriate fragment. |
| 27 | */ | |
| b6407c9d | 28 | |
| 156b8f82 KM |
29 | unsigned char fragtbl124[256] = { |
| 30 | 0x00, 0x16, 0x16, 0x2a, 0x16, 0x16, 0x26, 0x4e, | |
| 31 | 0x16, 0x16, 0x16, 0x3e, 0x2a, 0x3e, 0x4e, 0x8a, | |
| 32 | 0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e, | |
| 33 | 0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e, | |
| 34 | 0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e, | |
| 35 | 0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e, | |
| 36 | 0x2a, 0x3e, 0x3e, 0x2a, 0x3e, 0x3e, 0x2e, 0x6e, | |
| 37 | 0x3e, 0x3e, 0x3e, 0x3e, 0x2a, 0x3e, 0x6e, 0xaa, | |
| 38 | 0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e, | |
| 39 | 0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e, | |
| 40 | 0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e, | |
| 41 | 0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e, | |
| 42 | 0x26, 0x36, 0x36, 0x2e, 0x36, 0x36, 0x26, 0x6e, | |
| 43 | 0x36, 0x36, 0x36, 0x3e, 0x2e, 0x3e, 0x6e, 0xae, | |
| 44 | 0x4e, 0x5e, 0x5e, 0x6e, 0x5e, 0x5e, 0x6e, 0x4e, | |
| 45 | 0x5e, 0x5e, 0x5e, 0x7e, 0x6e, 0x7e, 0x4e, 0xce, | |
| 46 | 0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e, | |
| 47 | 0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e, | |
| 48 | 0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e, | |
| 49 | 0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e, | |
| 50 | 0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e, | |
| 51 | 0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e, | |
| 52 | 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x7e, | |
| 53 | 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x7e, 0xbe, | |
| 54 | 0x2a, 0x3e, 0x3e, 0x2a, 0x3e, 0x3e, 0x2e, 0x6e, | |
| 55 | 0x3e, 0x3e, 0x3e, 0x3e, 0x2a, 0x3e, 0x6e, 0xaa, | |
| 56 | 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x7e, | |
| 57 | 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x7e, 0xbe, | |
| 58 | 0x4e, 0x5e, 0x5e, 0x6e, 0x5e, 0x5e, 0x6e, 0x4e, | |
| 59 | 0x5e, 0x5e, 0x5e, 0x7e, 0x6e, 0x7e, 0x4e, 0xce, | |
| 60 | 0x8a, 0x9e, 0x9e, 0xaa, 0x9e, 0x9e, 0xae, 0xce, | |
| 61 | 0x9e, 0x9e, 0x9e, 0xbe, 0xaa, 0xbe, 0xce, 0x8a, | |
| 5576d804 | 62 | }; |
| 5576d804 | 63 | |
| b6407c9d | 64 | unsigned char fragtbl8[256] = { |
| 5576d804 KM |
65 | 0x00, 0x01, 0x01, 0x02, 0x01, 0x01, 0x02, 0x04, |
| 66 | 0x01, 0x01, 0x01, 0x03, 0x02, 0x03, 0x04, 0x08, | |
| 67 | 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, | |
| 68 | 0x02, 0x03, 0x03, 0x02, 0x04, 0x05, 0x08, 0x10, | |
| 69 | 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, | |
| 70 | 0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09, | |
| 71 | 0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06, | |
| 72 | 0x04, 0x05, 0x05, 0x06, 0x08, 0x09, 0x10, 0x20, | |
| 73 | 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, | |
| 74 | 0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09, | |
| 75 | 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, | |
| 76 | 0x03, 0x03, 0x03, 0x03, 0x05, 0x05, 0x09, 0x11, | |
| 77 | 0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06, | |
| 78 | 0x03, 0x03, 0x03, 0x03, 0x02, 0x03, 0x06, 0x0a, | |
| 79 | 0x04, 0x05, 0x05, 0x06, 0x05, 0x05, 0x06, 0x04, | |
| 80 | 0x08, 0x09, 0x09, 0x0a, 0x10, 0x11, 0x20, 0x40, | |
| 81 | 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, | |
| 82 | 0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09, | |
| 83 | 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, | |
| 84 | 0x03, 0x03, 0x03, 0x03, 0x05, 0x05, 0x09, 0x11, | |
| 85 | 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, | |
| 86 | 0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09, | |
| 87 | 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x07, | |
| 88 | 0x05, 0x05, 0x05, 0x07, 0x09, 0x09, 0x11, 0x21, | |
| 89 | 0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06, | |
| 90 | 0x03, 0x03, 0x03, 0x03, 0x02, 0x03, 0x06, 0x0a, | |
| 91 | 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x07, | |
| 92 | 0x02, 0x03, 0x03, 0x02, 0x06, 0x07, 0x0a, 0x12, | |
| 93 | 0x04, 0x05, 0x05, 0x06, 0x05, 0x05, 0x06, 0x04, | |
| 94 | 0x05, 0x05, 0x05, 0x07, 0x06, 0x07, 0x04, 0x0c, | |
| 95 | 0x08, 0x09, 0x09, 0x0a, 0x09, 0x09, 0x0a, 0x0c, | |
| 96 | 0x10, 0x11, 0x11, 0x12, 0x20, 0x21, 0x40, 0x80, | |
| 97 | }; | |
| b6407c9d KM |
98 | |
| 99 | /* | |
| 100 | * the actual fragtbl array | |
| 101 | */ | |
| 102 | unsigned char *fragtbl[MAXFRAG + 1] = { | |
| 156b8f82 | 103 | 0, fragtbl124, fragtbl124, 0, fragtbl124, 0, 0, 0, fragtbl8, |
| b6407c9d | 104 | }; |