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1.1 root 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: };
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