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 #ifdef USE_HOSTCC 12 #include <arpa/inet.h> 13 #else 14 #include <common.h> 15 #include <efi_loader.h> 16 #endif 17 #include <compiler.h> 18 #include <u-boot/crc.h> 19 20 #if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG) 21 #include <watchdog.h> 22 #endif 23 #include "u-boot/zlib.h" 24 25 #ifdef USE_HOSTCC 26 #define __efi_runtime 27 #define __efi_runtime_data 28 #endif 29 30 #define tole(x) cpu_to_le32(x) 31 32 #ifdef CONFIG_DYNAMIC_CRC_TABLE 33 34 static int __efi_runtime_data crc_table_empty = 1; 35 static uint32_t __efi_runtime_data crc_table[256]; 36 static void __efi_runtime make_crc_table OF((void)); 37 38 /* 39 Generate a table for a byte-wise 32-bit CRC calculation on the polynomial: 40 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. 41 42 Polynomials over GF(2) are represented in binary, one bit per coefficient, 43 with the lowest powers in the most significant bit. Then adding polynomials 44 is just exclusive-or, and multiplying a polynomial by x is a right shift by 45 one. If we call the above polynomial p, and represent a byte as the 46 polynomial q, also with the lowest power in the most significant bit (so the 47 byte 0xb1 is the polynomial x^7+x^3+x+1), then the CRC is (q*x^32) mod p, 48 where a mod b means the remainder after dividing a by b. 49 50 This calculation is done using the shift-register method of multiplying and 51 taking the remainder. The register is initialized to zero, and for each 52 incoming bit, x^32 is added mod p to the register if the bit is a one (where 53 x^32 mod p is p+x^32 = x^26+...+1), and the register is multiplied mod p by 54 x (which is shifting right by one and adding x^32 mod p if the bit shifted 55 out is a one). We start with the highest power (least significant bit) of 56 q and repeat for all eight bits of q. 57 58 The table is simply the CRC of all possible eight bit values. This is all 59 the information needed to generate CRC's on data a byte at a time for all 60 combinations of CRC register values and incoming bytes. 61 */ 62 static void __efi_runtime make_crc_table(void) 63 { 64 uint32_t c; 65 int n, k; 66 uLong poly; /* polynomial exclusive-or pattern */ 67 /* terms of polynomial defining this crc (except x^32): */ 68 static const Byte p[] = {0,1,2,4,5,7,8,10,11,12,16,22,23,26}; 69 70 /* make exclusive-or pattern from polynomial (0xedb88320L) */ 71 poly = 0L; 72 for (n = 0; n < sizeof(p)/sizeof(Byte); n++) 73 poly |= 1L << (31 - p[n]); 74 75 for (n = 0; n < 256; n++) 76 { 77 c = (uLong)n; 78 for (k = 0; k < 8; k++) 79 c = c & 1 ? poly ^ (c >> 1) : c >> 1; 80 crc_table[n] = tole(c); 81 } 82 crc_table_empty = 0; 83 } 84 #else 85 /* ======================================================================== 86 * Table of CRC-32's of all single-byte values (made by make_crc_table) 87 */ 88 89 static const uint32_t __efi_runtime_data crc_table[256] = { 90 tole(0x00000000L), tole(0x77073096L), tole(0xee0e612cL), tole(0x990951baL), 91 tole(0x076dc419L), tole(0x706af48fL), tole(0xe963a535L), tole(0x9e6495a3L), 92 tole(0x0edb8832L), tole(0x79dcb8a4L), tole(0xe0d5e91eL), tole(0x97d2d988L), 93 tole(0x09b64c2bL), tole(0x7eb17cbdL), tole(0xe7b82d07L), tole(0x90bf1d91L), 94 tole(0x1db71064L), tole(0x6ab020f2L), tole(0xf3b97148L), tole(0x84be41deL), 95 tole(0x1adad47dL), tole(0x6ddde4ebL), tole(0xf4d4b551L), tole(0x83d385c7L), 96 tole(0x136c9856L), tole(0x646ba8c0L), tole(0xfd62f97aL), tole(0x8a65c9ecL), 97 tole(0x14015c4fL), tole(0x63066cd9L), tole(0xfa0f3d63L), tole(0x8d080df5L), 98 tole(0x3b6e20c8L), tole(0x4c69105eL), tole(0xd56041e4L), tole(0xa2677172L), 99 tole(0x3c03e4d1L), tole(0x4b04d447L), tole(0xd20d85fdL), tole(0xa50ab56bL), 100 tole(0x35b5a8faL), tole(0x42b2986cL), tole(0xdbbbc9d6L), tole(0xacbcf940L), 101 tole(0x32d86ce3L), tole(0x45df5c75L), tole(0xdcd60dcfL), tole(0xabd13d59L), 102 tole(0x26d930acL), tole(0x51de003aL), tole(0xc8d75180L), tole(0xbfd06116L), 103 tole(0x21b4f4b5L), tole(0x56b3c423L), tole(0xcfba9599L), tole(0xb8bda50fL), 104 tole(0x2802b89eL), tole(0x5f058808L), tole(0xc60cd9b2L), tole(0xb10be924L), 105 tole(0x2f6f7c87L), tole(0x58684c11L), tole(0xc1611dabL), tole(0xb6662d3dL), 106 tole(0x76dc4190L), tole(0x01db7106L), tole(0x98d220bcL), tole(0xefd5102aL), 107 tole(0x71b18589L), tole(0x06b6b51fL), tole(0x9fbfe4a5L), tole(0xe8b8d433L), 108 tole(0x7807c9a2L), tole(0x0f00f934L), tole(0x9609a88eL), tole(0xe10e9818L), 109 tole(0x7f6a0dbbL), tole(0x086d3d2dL), tole(0x91646c97L), tole(0xe6635c01L), 110 tole(0x6b6b51f4L), tole(0x1c6c6162L), tole(0x856530d8L), tole(0xf262004eL), 111 tole(0x6c0695edL), tole(0x1b01a57bL), tole(0x8208f4c1L), tole(0xf50fc457L), 112 tole(0x65b0d9c6L), tole(0x12b7e950L), tole(0x8bbeb8eaL), tole(0xfcb9887cL), 113 tole(0x62dd1ddfL), tole(0x15da2d49L), tole(0x8cd37cf3L), tole(0xfbd44c65L), 114 tole(0x4db26158L), tole(0x3ab551ceL), tole(0xa3bc0074L), tole(0xd4bb30e2L), 115 tole(0x4adfa541L), tole(0x3dd895d7L), tole(0xa4d1c46dL), tole(0xd3d6f4fbL), 116 tole(0x4369e96aL), tole(0x346ed9fcL), tole(0xad678846L), tole(0xda60b8d0L), 117 tole(0x44042d73L), tole(0x33031de5L), tole(0xaa0a4c5fL), tole(0xdd0d7cc9L), 118 tole(0x5005713cL), tole(0x270241aaL), tole(0xbe0b1010L), tole(0xc90c2086L), 119 tole(0x5768b525L), tole(0x206f85b3L), tole(0xb966d409L), tole(0xce61e49fL), 120 tole(0x5edef90eL), tole(0x29d9c998L), tole(0xb0d09822L), tole(0xc7d7a8b4L), 121 tole(0x59b33d17L), tole(0x2eb40d81L), tole(0xb7bd5c3bL), tole(0xc0ba6cadL), 122 tole(0xedb88320L), tole(0x9abfb3b6L), tole(0x03b6e20cL), tole(0x74b1d29aL), 123 tole(0xead54739L), tole(0x9dd277afL), tole(0x04db2615L), tole(0x73dc1683L), 124 tole(0xe3630b12L), tole(0x94643b84L), tole(0x0d6d6a3eL), tole(0x7a6a5aa8L), 125 tole(0xe40ecf0bL), tole(0x9309ff9dL), tole(0x0a00ae27L), tole(0x7d079eb1L), 126 tole(0xf00f9344L), tole(0x8708a3d2L), tole(0x1e01f268L), tole(0x6906c2feL), 127 tole(0xf762575dL), tole(0x806567cbL), tole(0x196c3671L), tole(0x6e6b06e7L), 128 tole(0xfed41b76L), tole(0x89d32be0L), tole(0x10da7a5aL), tole(0x67dd4accL), 129 tole(0xf9b9df6fL), tole(0x8ebeeff9L), tole(0x17b7be43L), tole(0x60b08ed5L), 130 tole(0xd6d6a3e8L), tole(0xa1d1937eL), tole(0x38d8c2c4L), tole(0x4fdff252L), 131 tole(0xd1bb67f1L), tole(0xa6bc5767L), tole(0x3fb506ddL), tole(0x48b2364bL), 132 tole(0xd80d2bdaL), tole(0xaf0a1b4cL), tole(0x36034af6L), tole(0x41047a60L), 133 tole(0xdf60efc3L), tole(0xa867df55L), tole(0x316e8eefL), tole(0x4669be79L), 134 tole(0xcb61b38cL), tole(0xbc66831aL), tole(0x256fd2a0L), tole(0x5268e236L), 135 tole(0xcc0c7795L), tole(0xbb0b4703L), tole(0x220216b9L), tole(0x5505262fL), 136 tole(0xc5ba3bbeL), tole(0xb2bd0b28L), tole(0x2bb45a92L), tole(0x5cb36a04L), 137 tole(0xc2d7ffa7L), tole(0xb5d0cf31L), tole(0x2cd99e8bL), tole(0x5bdeae1dL), 138 tole(0x9b64c2b0L), tole(0xec63f226L), tole(0x756aa39cL), tole(0x026d930aL), 139 tole(0x9c0906a9L), tole(0xeb0e363fL), tole(0x72076785L), tole(0x05005713L), 140 tole(0x95bf4a82L), tole(0xe2b87a14L), tole(0x7bb12baeL), tole(0x0cb61b38L), 141 tole(0x92d28e9bL), tole(0xe5d5be0dL), tole(0x7cdcefb7L), tole(0x0bdbdf21L), 142 tole(0x86d3d2d4L), tole(0xf1d4e242L), tole(0x68ddb3f8L), tole(0x1fda836eL), 143 tole(0x81be16cdL), tole(0xf6b9265bL), tole(0x6fb077e1L), tole(0x18b74777L), 144 tole(0x88085ae6L), tole(0xff0f6a70L), tole(0x66063bcaL), tole(0x11010b5cL), 145 tole(0x8f659effL), tole(0xf862ae69L), tole(0x616bffd3L), tole(0x166ccf45L), 146 tole(0xa00ae278L), tole(0xd70dd2eeL), tole(0x4e048354L), tole(0x3903b3c2L), 147 tole(0xa7672661L), tole(0xd06016f7L), tole(0x4969474dL), tole(0x3e6e77dbL), 148 tole(0xaed16a4aL), tole(0xd9d65adcL), tole(0x40df0b66L), tole(0x37d83bf0L), 149 tole(0xa9bcae53L), tole(0xdebb9ec5L), tole(0x47b2cf7fL), tole(0x30b5ffe9L), 150 tole(0xbdbdf21cL), tole(0xcabac28aL), tole(0x53b39330L), tole(0x24b4a3a6L), 151 tole(0xbad03605L), tole(0xcdd70693L), tole(0x54de5729L), tole(0x23d967bfL), 152 tole(0xb3667a2eL), tole(0xc4614ab8L), tole(0x5d681b02L), tole(0x2a6f2b94L), 153 tole(0xb40bbe37L), tole(0xc30c8ea1L), tole(0x5a05df1bL), tole(0x2d02ef8dL) 154 }; 155 #endif 156 157 #if 0 158 /* ========================================================================= 159 * This function can be used by asm versions of crc32() 160 */ 161 const uint32_t * ZEXPORT get_crc_table() 162 { 163 #ifdef CONFIG_DYNAMIC_CRC_TABLE 164 if (crc_table_empty) make_crc_table(); 165 #endif 166 return (const uint32_t *)crc_table; 167 } 168 #endif 169 170 /* ========================================================================= */ 171 # if __BYTE_ORDER == __LITTLE_ENDIAN 172 # define DO_CRC(x) crc = tab[(crc ^ (x)) & 255] ^ (crc >> 8) 173 # else 174 # define DO_CRC(x) crc = tab[((crc >> 24) ^ (x)) & 255] ^ (crc << 8) 175 # endif 176 177 /* ========================================================================= */ 178 179 /* No ones complement version. JFFS2 (and other things ?) 180 * don't use ones compliment in their CRC calculations. 181 */ 182 uint32_t __efi_runtime crc32_no_comp(uint32_t crc, const Bytef *buf, uInt len) 183 { 184 const uint32_t *tab = crc_table; 185 const uint32_t *b =(const uint32_t *)buf; 186 size_t rem_len; 187 #ifdef CONFIG_DYNAMIC_CRC_TABLE 188 if (crc_table_empty) 189 make_crc_table(); 190 #endif 191 crc = cpu_to_le32(crc); 192 /* Align it */ 193 if (((long)b) & 3 && len) { 194 uint8_t *p = (uint8_t *)b; 195 do { 196 DO_CRC(*p++); 197 } while ((--len) && ((long)p)&3); 198 b = (uint32_t *)p; 199 } 200 201 rem_len = len & 3; 202 len = len >> 2; 203 for (--b; len; --len) { 204 /* load data 32 bits wide, xor data 32 bits wide. */ 205 crc ^= *++b; /* use pre increment for speed */ 206 DO_CRC(0); 207 DO_CRC(0); 208 DO_CRC(0); 209 DO_CRC(0); 210 } 211 len = rem_len; 212 /* And the last few bytes */ 213 if (len) { 214 uint8_t *p = (uint8_t *)(b + 1) - 1; 215 do { 216 DO_CRC(*++p); /* use pre increment for speed */ 217 } while (--len); 218 } 219 220 return le32_to_cpu(crc); 221 } 222 #undef DO_CRC 223 224 uint32_t __efi_runtime crc32(uint32_t crc, const Bytef *p, uInt len) 225 { 226 return crc32_no_comp(crc ^ 0xffffffffL, p, len) ^ 0xffffffffL; 227 } 228 229 /* 230 * Calculate the crc32 checksum triggering the watchdog every 'chunk_sz' bytes 231 * of input. 232 */ 233 uint32_t crc32_wd(uint32_t crc, const unsigned char *buf, uInt len, 234 uInt chunk_sz) 235 { 236 #if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG) 237 const unsigned char *end, *curr; 238 int chunk; 239 240 curr = buf; 241 end = buf + len; 242 while (curr < end) { 243 chunk = end - curr; 244 if (chunk > chunk_sz) 245 chunk = chunk_sz; 246 crc = crc32 (crc, curr, chunk); 247 curr += chunk; 248 WATCHDOG_RESET (); 249 } 250 #else 251 crc = crc32 (crc, buf, len); 252 #endif 253 254 return crc; 255 } 256 257 void crc32_wd_buf(const unsigned char *input, unsigned int ilen, 258 unsigned char *output, unsigned int chunk_sz) 259 { 260 uint32_t crc; 261 262 crc = crc32_wd(0, input, ilen, chunk_sz); 263 crc = htonl(crc); 264 memcpy(output, &crc, sizeof(crc)); 265 } 266