1 /* 2 * This file is derived from crc32.c from the zlib-1.1.3 distribution 3 * by Jean-loup Gailly and Mark Adler. 4 */ 5 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 9 */ 10 11 #ifndef USE_HOSTCC 12 #include <common.h> 13 #endif 14 #include <compiler.h> 15 #include <u-boot/crc.h> 16 17 #if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG) 18 #include <watchdog.h> 19 #endif 20 #include "u-boot/zlib.h" 21 22 #define local static 23 #define ZEXPORT /* empty */ 24 25 #define tole(x) cpu_to_le32(x) 26 27 #ifdef DYNAMIC_CRC_TABLE 28 29 local int crc_table_empty = 1; 30 local uint32_t crc_table[256]; 31 local void make_crc_table OF((void)); 32 33 /* 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. 36 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. 44 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. 52 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. 56 */ 57 local void make_crc_table() 58 { 59 uint32_t c; 60 int n, k; 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}; 64 65 /* make exclusive-or pattern from polynomial (0xedb88320L) */ 66 poly = 0L; 67 for (n = 0; n < sizeof(p)/sizeof(Byte); n++) 68 poly |= 1L << (31 - p[n]); 69 70 for (n = 0; n < 256; n++) 71 { 72 c = (uLong)n; 73 for (k = 0; k < 8; k++) 74 c = c & 1 ? poly ^ (c >> 1) : c >> 1; 75 crc_table[n] = tole(c); 76 } 77 crc_table_empty = 0; 78 } 79 #else 80 /* ======================================================================== 81 * Table of CRC-32's of all single-byte values (made by make_crc_table) 82 */ 83 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) 149 }; 150 #endif 151 152 #if 0 153 /* ========================================================================= 154 * This function can be used by asm versions of crc32() 155 */ 156 const uint32_t * ZEXPORT get_crc_table() 157 { 158 #ifdef DYNAMIC_CRC_TABLE 159 if (crc_table_empty) make_crc_table(); 160 #endif 161 return (const uint32_t *)crc_table; 162 } 163 #endif 164 165 /* ========================================================================= */ 166 # if __BYTE_ORDER == __LITTLE_ENDIAN 167 # define DO_CRC(x) crc = tab[(crc ^ (x)) & 255] ^ (crc >> 8) 168 # else 169 # define DO_CRC(x) crc = tab[((crc >> 24) ^ (x)) & 255] ^ (crc << 8) 170 # endif 171 172 /* ========================================================================= */ 173 174 /* No ones complement version. JFFS2 (and other things ?) 175 * don't use ones compliment in their CRC calculations. 176 */ 177 uint32_t ZEXPORT crc32_no_comp(uint32_t crc, const Bytef *buf, uInt len) 178 { 179 const uint32_t *tab = crc_table; 180 const uint32_t *b =(const uint32_t *)buf; 181 size_t rem_len; 182 #ifdef DYNAMIC_CRC_TABLE 183 if (crc_table_empty) 184 make_crc_table(); 185 #endif 186 crc = cpu_to_le32(crc); 187 /* Align it */ 188 if (((long)b) & 3 && len) { 189 uint8_t *p = (uint8_t *)b; 190 do { 191 DO_CRC(*p++); 192 } while ((--len) && ((long)p)&3); 193 b = (uint32_t *)p; 194 } 195 196 rem_len = len & 3; 197 len = len >> 2; 198 for (--b; len; --len) { 199 /* load data 32 bits wide, xor data 32 bits wide. */ 200 crc ^= *++b; /* use pre increment for speed */ 201 DO_CRC(0); 202 DO_CRC(0); 203 DO_CRC(0); 204 DO_CRC(0); 205 } 206 len = rem_len; 207 /* And the last few bytes */ 208 if (len) { 209 uint8_t *p = (uint8_t *)(b + 1) - 1; 210 do { 211 DO_CRC(*++p); /* use pre increment for speed */ 212 } while (--len); 213 } 214 215 return le32_to_cpu(crc); 216 } 217 #undef DO_CRC 218 219 uint32_t ZEXPORT crc32 (uint32_t crc, const Bytef *p, uInt len) 220 { 221 return crc32_no_comp(crc ^ 0xffffffffL, p, len) ^ 0xffffffffL; 222 } 223 224 /* 225 * Calculate the crc32 checksum triggering the watchdog every 'chunk_sz' bytes 226 * of input. 227 */ 228 uint32_t ZEXPORT crc32_wd (uint32_t crc, 229 const unsigned char *buf, 230 uInt len, uInt chunk_sz) 231 { 232 #if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG) 233 const unsigned char *end, *curr; 234 int chunk; 235 236 curr = buf; 237 end = buf + len; 238 while (curr < end) { 239 chunk = end - curr; 240 if (chunk > chunk_sz) 241 chunk = chunk_sz; 242 crc = crc32 (crc, curr, chunk); 243 curr += chunk; 244 WATCHDOG_RESET (); 245 } 246 #else 247 crc = crc32 (crc, buf, len); 248 #endif 249 250 return crc; 251 } 252