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 <efi_loader.h> 15#endif 16#include <compiler.h> 17#include <u-boot/crc.h> 18 19#if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG) 20#include <watchdog.h> 21#endif 22#include "u-boot/zlib.h" 23 24#ifdef USE_HOSTCC 25#define __efi_runtime 26#define __efi_runtime_data 27#define __efi_runtime_rodata 28#endif 29 30#define tole(x) cpu_to_le32(x) 31 32#ifdef CONFIG_DYNAMIC_CRC_TABLE 33 34static int __efi_runtime_data crc_table_empty = 1; 35static uint32_t __efi_runtime_data crc_table[256]; 36static 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*/ 62static 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 Byte __efi_runtime_data p[] = { 69 0, 1, 2, 4, 5, 7, 8, 10, 11, 12, 16, 22, 23, 26}; 70 71 /* make exclusive-or pattern from polynomial (0xedb88320L) */ 72 poly = 0L; 73 for (n = 0; n < sizeof(p)/sizeof(Byte); n++) 74 poly |= 1L << (31 - p[n]); 75 76 for (n = 0; n < 256; n++) 77 { 78 c = (uLong)n; 79 for (k = 0; k < 8; k++) 80 c = c & 1 ? poly ^ (c >> 1) : c >> 1; 81 crc_table[n] = tole(c); 82 } 83 crc_table_empty = 0; 84} 85#elif !defined(CONFIG_ARM64_CRC32) 86/* ======================================================================== 87 * Table of CRC-32's of all single-byte values (made by make_crc_table) 88 */ 89 90static const uint32_t __efi_runtime_rodata crc_table[256] = { 91tole(0x00000000L), tole(0x77073096L), tole(0xee0e612cL), tole(0x990951baL), 92tole(0x076dc419L), tole(0x706af48fL), tole(0xe963a535L), tole(0x9e6495a3L), 93tole(0x0edb8832L), tole(0x79dcb8a4L), tole(0xe0d5e91eL), tole(0x97d2d988L), 94tole(0x09b64c2bL), tole(0x7eb17cbdL), tole(0xe7b82d07L), tole(0x90bf1d91L), 95tole(0x1db71064L), tole(0x6ab020f2L), tole(0xf3b97148L), tole(0x84be41deL), 96tole(0x1adad47dL), tole(0x6ddde4ebL), tole(0xf4d4b551L), tole(0x83d385c7L), 97tole(0x136c9856L), tole(0x646ba8c0L), tole(0xfd62f97aL), tole(0x8a65c9ecL), 98tole(0x14015c4fL), tole(0x63066cd9L), tole(0xfa0f3d63L), tole(0x8d080df5L), 99tole(0x3b6e20c8L), tole(0x4c69105eL), tole(0xd56041e4L), tole(0xa2677172L), 100tole(0x3c03e4d1L), tole(0x4b04d447L), tole(0xd20d85fdL), tole(0xa50ab56bL), 101tole(0x35b5a8faL), tole(0x42b2986cL), tole(0xdbbbc9d6L), tole(0xacbcf940L), 102tole(0x32d86ce3L), tole(0x45df5c75L), tole(0xdcd60dcfL), tole(0xabd13d59L), 103tole(0x26d930acL), tole(0x51de003aL), tole(0xc8d75180L), tole(0xbfd06116L), 104tole(0x21b4f4b5L), tole(0x56b3c423L), tole(0xcfba9599L), tole(0xb8bda50fL), 105tole(0x2802b89eL), tole(0x5f058808L), tole(0xc60cd9b2L), tole(0xb10be924L), 106tole(0x2f6f7c87L), tole(0x58684c11L), tole(0xc1611dabL), tole(0xb6662d3dL), 107tole(0x76dc4190L), tole(0x01db7106L), tole(0x98d220bcL), tole(0xefd5102aL), 108tole(0x71b18589L), tole(0x06b6b51fL), tole(0x9fbfe4a5L), tole(0xe8b8d433L), 109tole(0x7807c9a2L), tole(0x0f00f934L), tole(0x9609a88eL), tole(0xe10e9818L), 110tole(0x7f6a0dbbL), tole(0x086d3d2dL), tole(0x91646c97L), tole(0xe6635c01L), 111tole(0x6b6b51f4L), tole(0x1c6c6162L), tole(0x856530d8L), tole(0xf262004eL), 112tole(0x6c0695edL), tole(0x1b01a57bL), tole(0x8208f4c1L), tole(0xf50fc457L), 113tole(0x65b0d9c6L), tole(0x12b7e950L), tole(0x8bbeb8eaL), tole(0xfcb9887cL), 114tole(0x62dd1ddfL), tole(0x15da2d49L), tole(0x8cd37cf3L), tole(0xfbd44c65L), 115tole(0x4db26158L), tole(0x3ab551ceL), tole(0xa3bc0074L), tole(0xd4bb30e2L), 116tole(0x4adfa541L), tole(0x3dd895d7L), tole(0xa4d1c46dL), tole(0xd3d6f4fbL), 117tole(0x4369e96aL), tole(0x346ed9fcL), tole(0xad678846L), tole(0xda60b8d0L), 118tole(0x44042d73L), tole(0x33031de5L), tole(0xaa0a4c5fL), tole(0xdd0d7cc9L), 119tole(0x5005713cL), tole(0x270241aaL), tole(0xbe0b1010L), tole(0xc90c2086L), 120tole(0x5768b525L), tole(0x206f85b3L), tole(0xb966d409L), tole(0xce61e49fL), 121tole(0x5edef90eL), tole(0x29d9c998L), tole(0xb0d09822L), tole(0xc7d7a8b4L), 122tole(0x59b33d17L), tole(0x2eb40d81L), tole(0xb7bd5c3bL), tole(0xc0ba6cadL), 123tole(0xedb88320L), tole(0x9abfb3b6L), tole(0x03b6e20cL), tole(0x74b1d29aL), 124tole(0xead54739L), tole(0x9dd277afL), tole(0x04db2615L), tole(0x73dc1683L), 125tole(0xe3630b12L), tole(0x94643b84L), tole(0x0d6d6a3eL), tole(0x7a6a5aa8L), 126tole(0xe40ecf0bL), tole(0x9309ff9dL), tole(0x0a00ae27L), tole(0x7d079eb1L), 127tole(0xf00f9344L), tole(0x8708a3d2L), tole(0x1e01f268L), tole(0x6906c2feL), 128tole(0xf762575dL), tole(0x806567cbL), tole(0x196c3671L), tole(0x6e6b06e7L), 129tole(0xfed41b76L), tole(0x89d32be0L), tole(0x10da7a5aL), tole(0x67dd4accL), 130tole(0xf9b9df6fL), tole(0x8ebeeff9L), tole(0x17b7be43L), tole(0x60b08ed5L), 131tole(0xd6d6a3e8L), tole(0xa1d1937eL), tole(0x38d8c2c4L), tole(0x4fdff252L), 132tole(0xd1bb67f1L), tole(0xa6bc5767L), tole(0x3fb506ddL), tole(0x48b2364bL), 133tole(0xd80d2bdaL), tole(0xaf0a1b4cL), tole(0x36034af6L), tole(0x41047a60L), 134tole(0xdf60efc3L), tole(0xa867df55L), tole(0x316e8eefL), tole(0x4669be79L), 135tole(0xcb61b38cL), tole(0xbc66831aL), tole(0x256fd2a0L), tole(0x5268e236L), 136tole(0xcc0c7795L), tole(0xbb0b4703L), tole(0x220216b9L), tole(0x5505262fL), 137tole(0xc5ba3bbeL), tole(0xb2bd0b28L), tole(0x2bb45a92L), tole(0x5cb36a04L), 138tole(0xc2d7ffa7L), tole(0xb5d0cf31L), tole(0x2cd99e8bL), tole(0x5bdeae1dL), 139tole(0x9b64c2b0L), tole(0xec63f226L), tole(0x756aa39cL), tole(0x026d930aL), 140tole(0x9c0906a9L), tole(0xeb0e363fL), tole(0x72076785L), tole(0x05005713L), 141tole(0x95bf4a82L), tole(0xe2b87a14L), tole(0x7bb12baeL), tole(0x0cb61b38L), 142tole(0x92d28e9bL), tole(0xe5d5be0dL), tole(0x7cdcefb7L), tole(0x0bdbdf21L), 143tole(0x86d3d2d4L), tole(0xf1d4e242L), tole(0x68ddb3f8L), tole(0x1fda836eL), 144tole(0x81be16cdL), tole(0xf6b9265bL), tole(0x6fb077e1L), tole(0x18b74777L), 145tole(0x88085ae6L), tole(0xff0f6a70L), tole(0x66063bcaL), tole(0x11010b5cL), 146tole(0x8f659effL), tole(0xf862ae69L), tole(0x616bffd3L), tole(0x166ccf45L), 147tole(0xa00ae278L), tole(0xd70dd2eeL), tole(0x4e048354L), tole(0x3903b3c2L), 148tole(0xa7672661L), tole(0xd06016f7L), tole(0x4969474dL), tole(0x3e6e77dbL), 149tole(0xaed16a4aL), tole(0xd9d65adcL), tole(0x40df0b66L), tole(0x37d83bf0L), 150tole(0xa9bcae53L), tole(0xdebb9ec5L), tole(0x47b2cf7fL), tole(0x30b5ffe9L), 151tole(0xbdbdf21cL), tole(0xcabac28aL), tole(0x53b39330L), tole(0x24b4a3a6L), 152tole(0xbad03605L), tole(0xcdd70693L), tole(0x54de5729L), tole(0x23d967bfL), 153tole(0xb3667a2eL), tole(0xc4614ab8L), tole(0x5d681b02L), tole(0x2a6f2b94L), 154tole(0xb40bbe37L), tole(0xc30c8ea1L), tole(0x5a05df1bL), tole(0x2d02ef8dL) 155}; 156#endif 157 158#if 0 159/* ========================================================================= 160 * This function can be used by asm versions of crc32() 161 */ 162const uint32_t * ZEXPORT get_crc_table() 163{ 164#ifdef CONFIG_DYNAMIC_CRC_TABLE 165 if (crc_table_empty) make_crc_table(); 166#endif 167 return (const uint32_t *)crc_table; 168} 169#endif 170 171/* ========================================================================= */ 172# if __BYTE_ORDER == __LITTLE_ENDIAN 173# define DO_CRC(x) crc = tab[(crc ^ (x)) & 255] ^ (crc >> 8) 174# else 175# define DO_CRC(x) crc = tab[((crc >> 24) ^ (x)) & 255] ^ (crc << 8) 176# endif 177 178/* ========================================================================= */ 179 180/* No ones complement version. JFFS2 (and other things ?) 181 * don't use ones compliment in their CRC calculations. 182 */ 183uint32_t __efi_runtime crc32_no_comp(uint32_t crc, const Bytef *buf, uInt len) 184{ 185#ifdef CONFIG_ARM64_CRC32 186 crc = cpu_to_le32(crc); 187 while (len--) 188 crc = __builtin_aarch64_crc32b(crc, *buf++); 189 return le32_to_cpu(crc); 190#else 191 const uint32_t *tab = crc_table; 192 const uint32_t *b =(const uint32_t *)buf; 193 size_t rem_len; 194#ifdef CONFIG_DYNAMIC_CRC_TABLE 195 if (crc_table_empty) 196 make_crc_table(); 197#endif 198 crc = cpu_to_le32(crc); 199 /* Align it */ 200 if (((long)b) & 3 && len) { 201 uint8_t *p = (uint8_t *)b; 202 do { 203 DO_CRC(*p++); 204 } while ((--len) && ((long)p)&3); 205 b = (uint32_t *)p; 206 } 207 208 rem_len = len & 3; 209 len = len >> 2; 210 for (--b; len; --len) { 211 /* load data 32 bits wide, xor data 32 bits wide. */ 212 crc ^= *++b; /* use pre increment for speed */ 213 DO_CRC(0); 214 DO_CRC(0); 215 DO_CRC(0); 216 DO_CRC(0); 217 } 218 len = rem_len; 219 /* And the last few bytes */ 220 if (len) { 221 uint8_t *p = (uint8_t *)(b + 1) - 1; 222 do { 223 DO_CRC(*++p); /* use pre increment for speed */ 224 } while (--len); 225 } 226 227 return le32_to_cpu(crc); 228#endif 229} 230#undef DO_CRC 231 232uint32_t __efi_runtime crc32(uint32_t crc, const Bytef *p, uInt len) 233{ 234 return crc32_no_comp(crc ^ 0xffffffffL, p, len) ^ 0xffffffffL; 235} 236 237/* 238 * Calculate the crc32 checksum triggering the watchdog every 'chunk_sz' bytes 239 * of input. 240 */ 241uint32_t crc32_wd(uint32_t crc, const unsigned char *buf, uInt len, 242 uInt chunk_sz) 243{ 244#if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG) 245 const unsigned char *end, *curr; 246 int chunk; 247 248 curr = buf; 249 end = buf + len; 250 while (curr < end) { 251 chunk = end - curr; 252 if (chunk > chunk_sz) 253 chunk = chunk_sz; 254 crc = crc32(crc, curr, chunk); 255 curr += chunk; 256 schedule(); 257 } 258#else 259 crc = crc32(crc, buf, len); 260#endif 261 262 return crc; 263} 264 265void crc32_wd_buf(const unsigned char *input, unsigned int ilen, 266 unsigned char *output, unsigned int chunk_sz) 267{ 268 uint32_t crc; 269 270 crc = crc32_wd(0, input, ilen, chunk_sz); 271 crc = htonl(crc); 272 memcpy(output, &crc, sizeof(crc)); 273} 274