]>
git.ipfire.org Git - people/ms/u-boot.git/blob - lib/crc32.c
2 * This file is derived from crc32.c from the zlib-1.1.3 distribution
3 * by Jean-loup Gailly and Mark Adler.
6 /* crc32.c -- compute the CRC-32 of a data stream
7 * Copyright (C) 1995-1998 Mark Adler
8 * For conditions of distribution and use, see copyright notice in zlib.h
15 #include <u-boot/crc.h>
17 #if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
20 #include "u-boot/zlib.h"
23 #define ZEXPORT /* empty */
25 #define tole(x) cpu_to_le32(x)
27 #ifdef DYNAMIC_CRC_TABLE
29 local
int crc_table_empty
= 1;
30 local
uint32_t crc_table
[256];
31 local
void make_crc_table
OF((void));
34 Generate a table for a byte-wise 32-bit CRC calculation on the polynomial:
35 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.
37 Polynomials over GF(2) are represented in binary, one bit per coefficient,
38 with the lowest powers in the most significant bit. Then adding polynomials
39 is just exclusive-or, and multiplying a polynomial by x is a right shift by
40 one. If we call the above polynomial p, and represent a byte as the
41 polynomial q, also with the lowest power in the most significant bit (so the
42 byte 0xb1 is the polynomial x^7+x^3+x+1), then the CRC is (q*x^32) mod p,
43 where a mod b means the remainder after dividing a by b.
45 This calculation is done using the shift-register method of multiplying and
46 taking the remainder. The register is initialized to zero, and for each
47 incoming bit, x^32 is added mod p to the register if the bit is a one (where
48 x^32 mod p is p+x^32 = x^26+...+1), and the register is multiplied mod p by
49 x (which is shifting right by one and adding x^32 mod p if the bit shifted
50 out is a one). We start with the highest power (least significant bit) of
51 q and repeat for all eight bits of q.
53 The table is simply the CRC of all possible eight bit values. This is all
54 the information needed to generate CRC's on data a byte at a time for all
55 combinations of CRC register values and incoming bytes.
57 local
void make_crc_table()
61 uLong poly
; /* polynomial exclusive-or pattern */
62 /* terms of polynomial defining this crc (except x^32): */
63 static const Byte p
[] = {0,1,2,4,5,7,8,10,11,12,16,22,23,26};
65 /* make exclusive-or pattern from polynomial (0xedb88320L) */
67 for (n
= 0; n
< sizeof(p
)/sizeof(Byte
); n
++)
68 poly
|= 1L << (31 - p
[n
]);
70 for (n
= 0; n
< 256; n
++)
73 for (k
= 0; k
< 8; k
++)
74 c
= c
& 1 ? poly
^ (c
>> 1) : c
>> 1;
75 crc_table
[n
] = tole(c
);
80 /* ========================================================================
81 * Table of CRC-32's of all single-byte values (made by make_crc_table)
84 local
const uint32_t crc_table
[256] = {
85 tole(0x00000000L
), tole(0x77073096L
), tole(0xee0e612cL
), tole(0x990951baL
),
86 tole(0x076dc419L
), tole(0x706af48fL
), tole(0xe963a535L
), tole(0x9e6495a3L
),
87 tole(0x0edb8832L
), tole(0x79dcb8a4L
), tole(0xe0d5e91eL
), tole(0x97d2d988L
),
88 tole(0x09b64c2bL
), tole(0x7eb17cbdL
), tole(0xe7b82d07L
), tole(0x90bf1d91L
),
89 tole(0x1db71064L
), tole(0x6ab020f2L
), tole(0xf3b97148L
), tole(0x84be41deL
),
90 tole(0x1adad47dL
), tole(0x6ddde4ebL
), tole(0xf4d4b551L
), tole(0x83d385c7L
),
91 tole(0x136c9856L
), tole(0x646ba8c0L
), tole(0xfd62f97aL
), tole(0x8a65c9ecL
),
92 tole(0x14015c4fL
), tole(0x63066cd9L
), tole(0xfa0f3d63L
), tole(0x8d080df5L
),
93 tole(0x3b6e20c8L
), tole(0x4c69105eL
), tole(0xd56041e4L
), tole(0xa2677172L
),
94 tole(0x3c03e4d1L
), tole(0x4b04d447L
), tole(0xd20d85fdL
), tole(0xa50ab56bL
),
95 tole(0x35b5a8faL
), tole(0x42b2986cL
), tole(0xdbbbc9d6L
), tole(0xacbcf940L
),
96 tole(0x32d86ce3L
), tole(0x45df5c75L
), tole(0xdcd60dcfL
), tole(0xabd13d59L
),
97 tole(0x26d930acL
), tole(0x51de003aL
), tole(0xc8d75180L
), tole(0xbfd06116L
),
98 tole(0x21b4f4b5L
), tole(0x56b3c423L
), tole(0xcfba9599L
), tole(0xb8bda50fL
),
99 tole(0x2802b89eL
), tole(0x5f058808L
), tole(0xc60cd9b2L
), tole(0xb10be924L
),
100 tole(0x2f6f7c87L
), tole(0x58684c11L
), tole(0xc1611dabL
), tole(0xb6662d3dL
),
101 tole(0x76dc4190L
), tole(0x01db7106L
), tole(0x98d220bcL
), tole(0xefd5102aL
),
102 tole(0x71b18589L
), tole(0x06b6b51fL
), tole(0x9fbfe4a5L
), tole(0xe8b8d433L
),
103 tole(0x7807c9a2L
), tole(0x0f00f934L
), tole(0x9609a88eL
), tole(0xe10e9818L
),
104 tole(0x7f6a0dbbL
), tole(0x086d3d2dL
), tole(0x91646c97L
), tole(0xe6635c01L
),
105 tole(0x6b6b51f4L
), tole(0x1c6c6162L
), tole(0x856530d8L
), tole(0xf262004eL
),
106 tole(0x6c0695edL
), tole(0x1b01a57bL
), tole(0x8208f4c1L
), tole(0xf50fc457L
),
107 tole(0x65b0d9c6L
), tole(0x12b7e950L
), tole(0x8bbeb8eaL
), tole(0xfcb9887cL
),
108 tole(0x62dd1ddfL
), tole(0x15da2d49L
), tole(0x8cd37cf3L
), tole(0xfbd44c65L
),
109 tole(0x4db26158L
), tole(0x3ab551ceL
), tole(0xa3bc0074L
), tole(0xd4bb30e2L
),
110 tole(0x4adfa541L
), tole(0x3dd895d7L
), tole(0xa4d1c46dL
), tole(0xd3d6f4fbL
),
111 tole(0x4369e96aL
), tole(0x346ed9fcL
), tole(0xad678846L
), tole(0xda60b8d0L
),
112 tole(0x44042d73L
), tole(0x33031de5L
), tole(0xaa0a4c5fL
), tole(0xdd0d7cc9L
),
113 tole(0x5005713cL
), tole(0x270241aaL
), tole(0xbe0b1010L
), tole(0xc90c2086L
),
114 tole(0x5768b525L
), tole(0x206f85b3L
), tole(0xb966d409L
), tole(0xce61e49fL
),
115 tole(0x5edef90eL
), tole(0x29d9c998L
), tole(0xb0d09822L
), tole(0xc7d7a8b4L
),
116 tole(0x59b33d17L
), tole(0x2eb40d81L
), tole(0xb7bd5c3bL
), tole(0xc0ba6cadL
),
117 tole(0xedb88320L
), tole(0x9abfb3b6L
), tole(0x03b6e20cL
), tole(0x74b1d29aL
),
118 tole(0xead54739L
), tole(0x9dd277afL
), tole(0x04db2615L
), tole(0x73dc1683L
),
119 tole(0xe3630b12L
), tole(0x94643b84L
), tole(0x0d6d6a3eL
), tole(0x7a6a5aa8L
),
120 tole(0xe40ecf0bL
), tole(0x9309ff9dL
), tole(0x0a00ae27L
), tole(0x7d079eb1L
),
121 tole(0xf00f9344L
), tole(0x8708a3d2L
), tole(0x1e01f268L
), tole(0x6906c2feL
),
122 tole(0xf762575dL
), tole(0x806567cbL
), tole(0x196c3671L
), tole(0x6e6b06e7L
),
123 tole(0xfed41b76L
), tole(0x89d32be0L
), tole(0x10da7a5aL
), tole(0x67dd4accL
),
124 tole(0xf9b9df6fL
), tole(0x8ebeeff9L
), tole(0x17b7be43L
), tole(0x60b08ed5L
),
125 tole(0xd6d6a3e8L
), tole(0xa1d1937eL
), tole(0x38d8c2c4L
), tole(0x4fdff252L
),
126 tole(0xd1bb67f1L
), tole(0xa6bc5767L
), tole(0x3fb506ddL
), tole(0x48b2364bL
),
127 tole(0xd80d2bdaL
), tole(0xaf0a1b4cL
), tole(0x36034af6L
), tole(0x41047a60L
),
128 tole(0xdf60efc3L
), tole(0xa867df55L
), tole(0x316e8eefL
), tole(0x4669be79L
),
129 tole(0xcb61b38cL
), tole(0xbc66831aL
), tole(0x256fd2a0L
), tole(0x5268e236L
),
130 tole(0xcc0c7795L
), tole(0xbb0b4703L
), tole(0x220216b9L
), tole(0x5505262fL
),
131 tole(0xc5ba3bbeL
), tole(0xb2bd0b28L
), tole(0x2bb45a92L
), tole(0x5cb36a04L
),
132 tole(0xc2d7ffa7L
), tole(0xb5d0cf31L
), tole(0x2cd99e8bL
), tole(0x5bdeae1dL
),
133 tole(0x9b64c2b0L
), tole(0xec63f226L
), tole(0x756aa39cL
), tole(0x026d930aL
),
134 tole(0x9c0906a9L
), tole(0xeb0e363fL
), tole(0x72076785L
), tole(0x05005713L
),
135 tole(0x95bf4a82L
), tole(0xe2b87a14L
), tole(0x7bb12baeL
), tole(0x0cb61b38L
),
136 tole(0x92d28e9bL
), tole(0xe5d5be0dL
), tole(0x7cdcefb7L
), tole(0x0bdbdf21L
),
137 tole(0x86d3d2d4L
), tole(0xf1d4e242L
), tole(0x68ddb3f8L
), tole(0x1fda836eL
),
138 tole(0x81be16cdL
), tole(0xf6b9265bL
), tole(0x6fb077e1L
), tole(0x18b74777L
),
139 tole(0x88085ae6L
), tole(0xff0f6a70L
), tole(0x66063bcaL
), tole(0x11010b5cL
),
140 tole(0x8f659effL
), tole(0xf862ae69L
), tole(0x616bffd3L
), tole(0x166ccf45L
),
141 tole(0xa00ae278L
), tole(0xd70dd2eeL
), tole(0x4e048354L
), tole(0x3903b3c2L
),
142 tole(0xa7672661L
), tole(0xd06016f7L
), tole(0x4969474dL
), tole(0x3e6e77dbL
),
143 tole(0xaed16a4aL
), tole(0xd9d65adcL
), tole(0x40df0b66L
), tole(0x37d83bf0L
),
144 tole(0xa9bcae53L
), tole(0xdebb9ec5L
), tole(0x47b2cf7fL
), tole(0x30b5ffe9L
),
145 tole(0xbdbdf21cL
), tole(0xcabac28aL
), tole(0x53b39330L
), tole(0x24b4a3a6L
),
146 tole(0xbad03605L
), tole(0xcdd70693L
), tole(0x54de5729L
), tole(0x23d967bfL
),
147 tole(0xb3667a2eL
), tole(0xc4614ab8L
), tole(0x5d681b02L
), tole(0x2a6f2b94L
),
148 tole(0xb40bbe37L
), tole(0xc30c8ea1L
), tole(0x5a05df1bL
), tole(0x2d02ef8dL
)
153 /* =========================================================================
154 * This function can be used by asm versions of crc32()
156 const uint32_t * ZEXPORT
get_crc_table()
158 #ifdef DYNAMIC_CRC_TABLE
159 if (crc_table_empty
) make_crc_table();
161 return (const uint32_t *)crc_table
;
165 /* ========================================================================= */
166 # if __BYTE_ORDER == __LITTLE_ENDIAN
167 # define DO_CRC(x) crc = tab[(crc ^ (x)) & 255] ^ (crc >> 8)
169 # define DO_CRC(x) crc = tab[((crc >> 24) ^ (x)) & 255] ^ (crc << 8)
172 /* ========================================================================= */
174 /* No ones complement version. JFFS2 (and other things ?)
175 * don't use ones compliment in their CRC calculations.
177 uint32_t ZEXPORT
crc32_no_comp(uint32_t crc
, const Bytef
*buf
, uInt len
)
179 const uint32_t *tab
= crc_table
;
180 const uint32_t *b
=(const uint32_t *)buf
;
182 #ifdef DYNAMIC_CRC_TABLE
186 crc
= cpu_to_le32(crc
);
188 if (((long)b
) & 3 && len
) {
189 uint8_t *p
= (uint8_t *)b
;
192 } while ((--len
) && ((long)p
)&3);
198 for (--b
; len
; --len
) {
199 /* load data 32 bits wide, xor data 32 bits wide. */
200 crc
^= *++b
; /* use pre increment for speed */
207 /* And the last few bytes */
209 uint8_t *p
= (uint8_t *)(b
+ 1) - 1;
211 DO_CRC(*++p
); /* use pre increment for speed */
215 return le32_to_cpu(crc
);
219 uint32_t ZEXPORT
crc32 (uint32_t crc
, const Bytef
*p
, uInt len
)
221 return crc32_no_comp(crc
^ 0xffffffffL
, p
, len
) ^ 0xffffffffL
;
225 * Calculate the crc32 checksum triggering the watchdog every 'chunk_sz' bytes
228 uint32_t ZEXPORT
crc32_wd (uint32_t crc
,
229 const unsigned char *buf
,
230 uInt len
, uInt chunk_sz
)
232 #if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
233 const unsigned char *end
, *curr
;
240 if (chunk
> chunk_sz
)
242 crc
= crc32 (crc
, curr
, chunk
);
247 crc
= crc32 (crc
, buf
, len
);
projects / people / ms / u-boot.git / blob