nataraid(4): Add devstat support.
[dragonfly.git] / sys / libkern / crc32.c
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1/*-
2 * COPYRIGHT (C) 1986 Gary S. Brown. You may use this program, or
3 * code or tables extracted from it, as desired without restriction.
4 *
5 * First, the polynomial itself and its table of feedback terms. The
6 * polynomial is
7 * X^32+X^26+X^23+X^22+X^16+X^12+X^11+X^10+X^8+X^7+X^5+X^4+X^2+X^1+X^0
8 *
9 * Note that we take it "backwards" and put the highest-order term in
10 * the lowest-order bit. The X^32 term is "implied"; the LSB is the
11 * X^31 term, etc. The X^0 term (usually shown as "+1") results in
12 * the MSB being 1
13 *
14 * Note that the usual hardware shift register implementation, which
15 * is what we're using (we're merely optimizing it by doing eight-bit
16 * chunks at a time) shifts bits into the lowest-order term. In our
17 * implementation, that means shifting towards the right. Why do we
18 * do it this way? Because the calculated CRC must be transmitted in
19 * order from highest-order term to lowest-order term. UARTs transmit
20 * characters in order from LSB to MSB. By storing the CRC this way
21 * we hand it to the UART in the order low-byte to high-byte; the UART
22 * sends each low-bit to hight-bit; and the result is transmission bit
23 * by bit from highest- to lowest-order term without requiring any bit
24 * shuffling on our part. Reception works similarly
25 *
26 * The feedback terms table consists of 256, 32-bit entries. Notes
27 *
28 * The table can be generated at runtime if desired; code to do so
29 * is shown later. It might not be obvious, but the feedback
30 * terms simply represent the results of eight shift/xor opera
31 * tions for all combinations of data and CRC register values
32 *
33 * The values must be right-shifted by eight bits by the "updcrc
34 * logic; the shift must be unsigned (bring in zeroes). On some
35 * hardware you could probably optimize the shift in assembler by
36 * using byte-swap instructions
37 * polynomial $edb88320
38 *
984263bc 39 * CRC32 code derived from work by Gary S. Brown.
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40 *
41 * $FreeBSD: src/sys/libkern/crc32.c,v 1.1.2.1 2002/07/31 09:08:34 imp Exp $
45f92b3a 42 * $DragonFly: src/sys/libkern/crc32.c,v 1.7 2008/11/03 08:41:31 swildner Exp $
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43 */
44
45/*
46 * WARNING: This code is used by various subsystems including the HAMMER
47 * filesystem. This code may be directly compiled in userland or kernel
48 * builds.
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49 */
50
4d723c91 51#ifdef _KERNEL
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52#include <sys/param.h>
53#include <sys/systm.h>
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54#else
55#include <sys/types.h>
56#endif
984263bc 57
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58#ifndef _KERNEL
59/* prototypes for the kernel are in <sys/systm.h> */
d0bcc9f3 60uint32_t crc32(const void *buf, size_t size);
6dd73847 61uint32_t crc32_ext(const void *buf, size_t size, uint32_t ocrc);
45f92b3a 62#endif
d0bcc9f3 63
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64uint32_t crc32_tab[] = {
65 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
66 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
67 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
68 0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
69 0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
70 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
71 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c,
72 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
73 0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
74 0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
75 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106,
76 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
77 0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
78 0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
79 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
80 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
81 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,
82 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
83 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
84 0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
85 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
86 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
87 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
88 0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
89 0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
90 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
91 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
92 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
93 0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,
94 0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
95 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
96 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
97 0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
98 0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
99 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
100 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
101 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
102 0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
103 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
104 0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
105 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,
106 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
107 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
108};
109
110uint32_t
111crc32(const void *buf, size_t size)
112{
113 const uint8_t *p;
114 uint32_t crc;
115
116 p = buf;
117 crc = ~0U;
118
119 while (size--)
120 crc = crc32_tab[(crc ^ *p++) & 0xFF] ^ (crc >> 8);
121
122 return crc ^ ~0U;
123}
124
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125uint32_t
126crc32_ext(const void *buf, size_t size, uint32_t ocrc)
127{
128 const uint8_t *p;
129 uint32_t crc;
130
131 p = buf;
132 crc = ~ocrc;
133
134 while (size--)
135 crc = crc32_tab[(crc ^ *p++) & 0xFF] ^ (crc >> 8);
136
137 return crc ^ ~0U;
138}
139