LXR uboot/lib/crc32.c

   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
  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#else
  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_data 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    const uint32_t *tab = crc_table;
 186    const uint32_t *b =(const uint32_t *)buf;
 187    size_t rem_len;
 188#ifdef CONFIG_DYNAMIC_CRC_TABLE
 189    if (crc_table_empty)
 190      make_crc_table();
 191#endif
 192    crc = cpu_to_le32(crc);
 193    /* Align it */
 194    if (((long)b) & 3 && len) {
 195         uint8_t *p = (uint8_t *)b;
 196         do {
 197              DO_CRC(*p++);
 198         } while ((--len) && ((long)p)&3);
 199         b = (uint32_t *)p;
 200    }
 201
 202    rem_len = len & 3;
 203    len = len >> 2;
 204    for (--b; len; --len) {
 205         /* load data 32 bits wide, xor data 32 bits wide. */
 206         crc ^= *++b; /* use pre increment for speed */
 207         DO_CRC(0);
 208         DO_CRC(0);
 209         DO_CRC(0);
 210         DO_CRC(0);
 211    }
 212    len = rem_len;
 213    /* And the last few bytes */
 214    if (len) {
 215         uint8_t *p = (uint8_t *)(b + 1) - 1;
 216         do {
 217              DO_CRC(*++p); /* use pre increment for speed */
 218         } while (--len);
 219    }
 220
 221    return le32_to_cpu(crc);
 222}
 223#undef DO_CRC
 224
 225uint32_t __efi_runtime crc32(uint32_t crc, const Bytef *p, uInt len)
 226{
 227     return crc32_no_comp(crc ^ 0xffffffffL, p, len) ^ 0xffffffffL;
 228}
 229
 230/*
 231 * Calculate the crc32 checksum triggering the watchdog every 'chunk_sz' bytes
 232 * of input.
 233 */
 234uint32_t crc32_wd(uint32_t crc, const unsigned char *buf, uInt len,
 235                  uInt chunk_sz)
 236{
 237#if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
 238        const unsigned char *end, *curr;
 239        int chunk;
 240
 241        curr = buf;
 242        end = buf + len;
 243        while (curr < end) {
 244                chunk = end - curr;
 245                if (chunk > chunk_sz)
 246                        chunk = chunk_sz;
 247                crc = crc32 (crc, curr, chunk);
 248                curr += chunk;
 249                WATCHDOG_RESET ();
 250        }
 251#else
 252        crc = crc32 (crc, buf, len);
 253#endif
 254
 255        return crc;
 256}
 257
 258void crc32_wd_buf(const unsigned char *input, unsigned int ilen,
 259                unsigned char *output, unsigned int chunk_sz)
 260{
 261        uint32_t crc;
 262
 263        crc = crc32_wd(0, input, ilen, chunk_sz);
 264        crc = htonl(crc);
 265        memcpy(output, &crc, sizeof(crc));
 266}
 267