| 1 | /* |
| 2 | * Copyright (c) 1982, 1986 Regents of the University of California. |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * 1. Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in the |
| 12 | * documentation and/or other materials provided with the distribution. |
| 13 | * 3. All advertising materials mentioning features or use of this software |
| 14 | * must display the following acknowledgement: |
| 15 | * This product includes software developed by the University of |
| 16 | * California, Berkeley and its contributors. |
| 17 | * 4. Neither the name of the University nor the names of its contributors |
| 18 | * may be used to endorse or promote products derived from this software |
| 19 | * without specific prior written permission. |
| 20 | * |
| 21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 31 | * SUCH DAMAGE. |
| 32 | * |
| 33 | * @(#)ufs_tables.c 7.4 (Berkeley) 6/28/90 |
| 34 | */ |
| 35 | |
| 36 | #ifdef KERNEL |
| 37 | #include "param.h" |
| 38 | #else |
| 39 | #include <sys/param.h> |
| 40 | #endif |
| 41 | |
| 42 | /* |
| 43 | * Bit patterns for identifying fragments in the block map |
| 44 | * used as ((map & around) == inside) |
| 45 | */ |
| 46 | int around[9] = { |
| 47 | 0x3, 0x7, 0xf, 0x1f, 0x3f, 0x7f, 0xff, 0x1ff, 0x3ff |
| 48 | }; |
| 49 | int inside[9] = { |
| 50 | 0x0, 0x2, 0x6, 0xe, 0x1e, 0x3e, 0x7e, 0xfe, 0x1fe |
| 51 | }; |
| 52 | |
| 53 | /* |
| 54 | * Given a block map bit pattern, the frag tables tell whether a |
| 55 | * particular size fragment is available. |
| 56 | * |
| 57 | * used as: |
| 58 | * if ((1 << (size - 1)) & fragtbl[fs->fs_frag][map] { |
| 59 | * at least one fragment of the indicated size is available |
| 60 | * } |
| 61 | * |
| 62 | * These tables are used by the scanc instruction on the VAX to |
| 63 | * quickly find an appropriate fragment. |
| 64 | */ |
| 65 | u_char fragtbl124[256] = { |
| 66 | 0x00, 0x16, 0x16, 0x2a, 0x16, 0x16, 0x26, 0x4e, |
| 67 | 0x16, 0x16, 0x16, 0x3e, 0x2a, 0x3e, 0x4e, 0x8a, |
| 68 | 0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e, |
| 69 | 0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e, |
| 70 | 0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e, |
| 71 | 0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e, |
| 72 | 0x2a, 0x3e, 0x3e, 0x2a, 0x3e, 0x3e, 0x2e, 0x6e, |
| 73 | 0x3e, 0x3e, 0x3e, 0x3e, 0x2a, 0x3e, 0x6e, 0xaa, |
| 74 | 0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e, |
| 75 | 0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e, |
| 76 | 0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e, |
| 77 | 0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e, |
| 78 | 0x26, 0x36, 0x36, 0x2e, 0x36, 0x36, 0x26, 0x6e, |
| 79 | 0x36, 0x36, 0x36, 0x3e, 0x2e, 0x3e, 0x6e, 0xae, |
| 80 | 0x4e, 0x5e, 0x5e, 0x6e, 0x5e, 0x5e, 0x6e, 0x4e, |
| 81 | 0x5e, 0x5e, 0x5e, 0x7e, 0x6e, 0x7e, 0x4e, 0xce, |
| 82 | 0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e, |
| 83 | 0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e, |
| 84 | 0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e, |
| 85 | 0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e, |
| 86 | 0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e, |
| 87 | 0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e, |
| 88 | 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x7e, |
| 89 | 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x7e, 0xbe, |
| 90 | 0x2a, 0x3e, 0x3e, 0x2a, 0x3e, 0x3e, 0x2e, 0x6e, |
| 91 | 0x3e, 0x3e, 0x3e, 0x3e, 0x2a, 0x3e, 0x6e, 0xaa, |
| 92 | 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x7e, |
| 93 | 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x7e, 0xbe, |
| 94 | 0x4e, 0x5e, 0x5e, 0x6e, 0x5e, 0x5e, 0x6e, 0x4e, |
| 95 | 0x5e, 0x5e, 0x5e, 0x7e, 0x6e, 0x7e, 0x4e, 0xce, |
| 96 | 0x8a, 0x9e, 0x9e, 0xaa, 0x9e, 0x9e, 0xae, 0xce, |
| 97 | 0x9e, 0x9e, 0x9e, 0xbe, 0xaa, 0xbe, 0xce, 0x8a, |
| 98 | }; |
| 99 | |
| 100 | u_char fragtbl8[256] = { |
| 101 | 0x00, 0x01, 0x01, 0x02, 0x01, 0x01, 0x02, 0x04, |
| 102 | 0x01, 0x01, 0x01, 0x03, 0x02, 0x03, 0x04, 0x08, |
| 103 | 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, |
| 104 | 0x02, 0x03, 0x03, 0x02, 0x04, 0x05, 0x08, 0x10, |
| 105 | 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, |
| 106 | 0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09, |
| 107 | 0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06, |
| 108 | 0x04, 0x05, 0x05, 0x06, 0x08, 0x09, 0x10, 0x20, |
| 109 | 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, |
| 110 | 0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09, |
| 111 | 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, |
| 112 | 0x03, 0x03, 0x03, 0x03, 0x05, 0x05, 0x09, 0x11, |
| 113 | 0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06, |
| 114 | 0x03, 0x03, 0x03, 0x03, 0x02, 0x03, 0x06, 0x0a, |
| 115 | 0x04, 0x05, 0x05, 0x06, 0x05, 0x05, 0x06, 0x04, |
| 116 | 0x08, 0x09, 0x09, 0x0a, 0x10, 0x11, 0x20, 0x40, |
| 117 | 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, |
| 118 | 0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09, |
| 119 | 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, |
| 120 | 0x03, 0x03, 0x03, 0x03, 0x05, 0x05, 0x09, 0x11, |
| 121 | 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, |
| 122 | 0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09, |
| 123 | 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x07, |
| 124 | 0x05, 0x05, 0x05, 0x07, 0x09, 0x09, 0x11, 0x21, |
| 125 | 0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06, |
| 126 | 0x03, 0x03, 0x03, 0x03, 0x02, 0x03, 0x06, 0x0a, |
| 127 | 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x07, |
| 128 | 0x02, 0x03, 0x03, 0x02, 0x06, 0x07, 0x0a, 0x12, |
| 129 | 0x04, 0x05, 0x05, 0x06, 0x05, 0x05, 0x06, 0x04, |
| 130 | 0x05, 0x05, 0x05, 0x07, 0x06, 0x07, 0x04, 0x0c, |
| 131 | 0x08, 0x09, 0x09, 0x0a, 0x09, 0x09, 0x0a, 0x0c, |
| 132 | 0x10, 0x11, 0x11, 0x12, 0x20, 0x21, 0x40, 0x80, |
| 133 | }; |
| 134 | |
| 135 | /* |
| 136 | * The actual fragtbl array. |
| 137 | */ |
| 138 | u_char *fragtbl[MAXFRAG + 1] = { |
| 139 | 0, fragtbl124, fragtbl124, 0, fragtbl124, 0, 0, 0, fragtbl8, |
| 140 | }; |