Annotation of src/sys/ufs/ffs/ffs_tables.c, Revision 1.3.6.1
1.3.6.1 ! thorpej 1: /* $NetBSD: ffs_tables.c,v 1.4 2001/10/30 01:11:54 lukem Exp $ */
1.2 cgd 2:
1.1 mycroft 3: /*
4: * Copyright (c) 1982, 1986, 1993
5: * The Regents of the University of California. All rights reserved.
6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: * 3. All advertising materials mentioning features or use of this software
16: * must display the following acknowledgement:
17: * This product includes software developed by the University of
18: * California, Berkeley and its contributors.
19: * 4. Neither the name of the University nor the names of its contributors
20: * may be used to endorse or promote products derived from this software
21: * without specific prior written permission.
22: *
23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33: * SUCH DAMAGE.
34: *
1.2 cgd 35: * @(#)ffs_tables.c 8.1 (Berkeley) 6/11/93
1.1 mycroft 36: */
1.3.6.1 ! thorpej 37:
! 38: #include <sys/cdefs.h>
! 39: __KERNEL_RCSID(0, "$NetBSD: ffs_tables.c,v 1.4 2001/10/30 01:11:54 lukem Exp $");
1.1 mycroft 40:
41: #include <sys/param.h>
42:
43: /*
44: * Bit patterns for identifying fragments in the block map
45: * used as ((map & around) == inside)
46: */
1.3 jdolecek 47: const int around[9] = {
1.1 mycroft 48: 0x3, 0x7, 0xf, 0x1f, 0x3f, 0x7f, 0xff, 0x1ff, 0x3ff
49: };
1.3 jdolecek 50: const int inside[9] = {
1.1 mycroft 51: 0x0, 0x2, 0x6, 0xe, 0x1e, 0x3e, 0x7e, 0xfe, 0x1fe
52: };
53:
54: /*
55: * Given a block map bit pattern, the frag tables tell whether a
56: * particular size fragment is available.
57: *
58: * used as:
59: * if ((1 << (size - 1)) & fragtbl[fs->fs_frag][map] {
60: * at least one fragment of the indicated size is available
61: * }
62: *
63: * These tables are used by the scanc instruction on the VAX to
64: * quickly find an appropriate fragment.
65: */
1.3 jdolecek 66: const u_char fragtbl124[256] = {
1.1 mycroft 67: 0x00, 0x16, 0x16, 0x2a, 0x16, 0x16, 0x26, 0x4e,
68: 0x16, 0x16, 0x16, 0x3e, 0x2a, 0x3e, 0x4e, 0x8a,
69: 0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
70: 0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
71: 0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
72: 0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
73: 0x2a, 0x3e, 0x3e, 0x2a, 0x3e, 0x3e, 0x2e, 0x6e,
74: 0x3e, 0x3e, 0x3e, 0x3e, 0x2a, 0x3e, 0x6e, 0xaa,
75: 0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
76: 0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
77: 0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
78: 0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
79: 0x26, 0x36, 0x36, 0x2e, 0x36, 0x36, 0x26, 0x6e,
80: 0x36, 0x36, 0x36, 0x3e, 0x2e, 0x3e, 0x6e, 0xae,
81: 0x4e, 0x5e, 0x5e, 0x6e, 0x5e, 0x5e, 0x6e, 0x4e,
82: 0x5e, 0x5e, 0x5e, 0x7e, 0x6e, 0x7e, 0x4e, 0xce,
83: 0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
84: 0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
85: 0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
86: 0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
87: 0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
88: 0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
89: 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x7e,
90: 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x7e, 0xbe,
91: 0x2a, 0x3e, 0x3e, 0x2a, 0x3e, 0x3e, 0x2e, 0x6e,
92: 0x3e, 0x3e, 0x3e, 0x3e, 0x2a, 0x3e, 0x6e, 0xaa,
93: 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x7e,
94: 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x7e, 0xbe,
95: 0x4e, 0x5e, 0x5e, 0x6e, 0x5e, 0x5e, 0x6e, 0x4e,
96: 0x5e, 0x5e, 0x5e, 0x7e, 0x6e, 0x7e, 0x4e, 0xce,
97: 0x8a, 0x9e, 0x9e, 0xaa, 0x9e, 0x9e, 0xae, 0xce,
98: 0x9e, 0x9e, 0x9e, 0xbe, 0xaa, 0xbe, 0xce, 0x8a,
99: };
100:
1.3 jdolecek 101: const u_char fragtbl8[256] = {
1.1 mycroft 102: 0x00, 0x01, 0x01, 0x02, 0x01, 0x01, 0x02, 0x04,
103: 0x01, 0x01, 0x01, 0x03, 0x02, 0x03, 0x04, 0x08,
104: 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
105: 0x02, 0x03, 0x03, 0x02, 0x04, 0x05, 0x08, 0x10,
106: 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
107: 0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09,
108: 0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06,
109: 0x04, 0x05, 0x05, 0x06, 0x08, 0x09, 0x10, 0x20,
110: 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
111: 0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09,
112: 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
113: 0x03, 0x03, 0x03, 0x03, 0x05, 0x05, 0x09, 0x11,
114: 0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06,
115: 0x03, 0x03, 0x03, 0x03, 0x02, 0x03, 0x06, 0x0a,
116: 0x04, 0x05, 0x05, 0x06, 0x05, 0x05, 0x06, 0x04,
117: 0x08, 0x09, 0x09, 0x0a, 0x10, 0x11, 0x20, 0x40,
118: 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
119: 0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09,
120: 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
121: 0x03, 0x03, 0x03, 0x03, 0x05, 0x05, 0x09, 0x11,
122: 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
123: 0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09,
124: 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x07,
125: 0x05, 0x05, 0x05, 0x07, 0x09, 0x09, 0x11, 0x21,
126: 0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06,
127: 0x03, 0x03, 0x03, 0x03, 0x02, 0x03, 0x06, 0x0a,
128: 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x07,
129: 0x02, 0x03, 0x03, 0x02, 0x06, 0x07, 0x0a, 0x12,
130: 0x04, 0x05, 0x05, 0x06, 0x05, 0x05, 0x06, 0x04,
131: 0x05, 0x05, 0x05, 0x07, 0x06, 0x07, 0x04, 0x0c,
132: 0x08, 0x09, 0x09, 0x0a, 0x09, 0x09, 0x0a, 0x0c,
133: 0x10, 0x11, 0x11, 0x12, 0x20, 0x21, 0x40, 0x80,
134: };
135:
136: /*
137: * The actual fragtbl array.
138: */
1.3 jdolecek 139: const u_char * const fragtbl[MAXFRAG + 1] = {
1.1 mycroft 140: 0, fragtbl124, fragtbl124, 0, fragtbl124, 0, 0, 0, fragtbl8,
141: };
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