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#include <u-boot/crc.h>
  14#else
  15#include <common.h>
  16#include <efi_loader.h>
  17#endif
  18#include <compiler.h>
  19#include <u-boot/crc.h>
  20
  21#if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
  22#include <watchdog.h>
  23#endif
  24#include "u-boot/zlib.h"
  25
  26#ifdef USE_HOSTCC
  27#define __efi_runtime
  28#define __efi_runtime_data
  29#define __efi_runtime_rodata
  30#endif
  31
  32#define tole(x) cpu_to_le32(x)
  33
  34#ifdef CONFIG_DYNAMIC_CRC_TABLE
  35
  36static int __efi_runtime_data crc_table_empty = 1;
  37static uint32_t __efi_runtime_data crc_table[256];
  38static void __efi_runtime make_crc_table OF((void));
  39
  40/*
  41  Generate a table for a byte-wise 32-bit CRC calculation on the polynomial:
  42  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.
  43
  44  Polynomials over GF(2) are represented in binary, one bit per coefficient,
  45  with the lowest powers in the most significant bit.  Then adding polynomials
  46  is just exclusive-or, and multiplying a polynomial by x is a right shift by
  47  one.  If we call the above polynomial p, and represent a byte as the
  48  polynomial q, also with the lowest power in the most significant bit (so the
  49  byte 0xb1 is the polynomial x^7+x^3+x+1), then the CRC is (q*x^32) mod p,
  50  where a mod b means the remainder after dividing a by b.
  51
  52  This calculation is done using the shift-register method of multiplying and
  53  taking the remainder.  The register is initialized to zero, and for each
  54  incoming bit, x^32 is added mod p to the register if the bit is a one (where
  55  x^32 mod p is p+x^32 = x^26+...+1), and the register is multiplied mod p by
  56  x (which is shifting right by one and adding x^32 mod p if the bit shifted
  57  out is a one).  We start with the highest power (least significant bit) of
  58  q and repeat for all eight bits of q.
  59
  60  The table is simply the CRC of all possible eight bit values.  This is all
  61  the information needed to generate CRC's on data a byte at a time for all
  62  combinations of CRC register values and incoming bytes.
  63*/
  64static void __efi_runtime make_crc_table(void)
  65{
  66  uint32_t c;
  67  int n, k;
  68  uLong poly;           /* polynomial exclusive-or pattern */
  69  /* terms of polynomial defining this crc (except x^32): */
  70  static Byte __efi_runtime_data p[] = {
  71                0, 1, 2, 4, 5, 7, 8, 10, 11, 12, 16, 22, 23, 26};
  72
  73  /* make exclusive-or pattern from polynomial (0xedb88320L) */
  74  poly = 0L;
  75  for (n = 0; n < sizeof(p)/sizeof(Byte); n++)
  76    poly |= 1L << (31 - p[n]);
  77
  78  for (n = 0; n < 256; n++)
  79  {
  80    c = (uLong)n;
  81    for (k = 0; k < 8; k++)
  82      c = c & 1 ? poly ^ (c >> 1) : c >> 1;
  83    crc_table[n] = tole(c);
  84  }
  85  crc_table_empty = 0;
  86}
  87#elif !defined(CONFIG_ARM64_CRC32)
  88/* ========================================================================
  89 * Table of CRC-32's of all single-byte values (made by make_crc_table)
  90 */
  91
  92static const uint32_t __efi_runtime_rodata crc_table[256] = {
  93tole(0x00000000L), tole(0x77073096L), tole(0xee0e612cL), tole(0x990951baL),
  94tole(0x076dc419L), tole(0x706af48fL), tole(0xe963a535L), tole(0x9e6495a3L),
  95tole(0x0edb8832L), tole(0x79dcb8a4L), tole(0xe0d5e91eL), tole(0x97d2d988L),
  96tole(0x09b64c2bL), tole(0x7eb17cbdL), tole(0xe7b82d07L), tole(0x90bf1d91L),
  97tole(0x1db71064L), tole(0x6ab020f2L), tole(0xf3b97148L), tole(0x84be41deL),
  98tole(0x1adad47dL), tole(0x6ddde4ebL), tole(0xf4d4b551L), tole(0x83d385c7L),
  99tole(0x136c9856L), tole(0x646ba8c0L), tole(0xfd62f97aL), tole(0x8a65c9ecL),
 100tole(0x14015c4fL), tole(0x63066cd9L), tole(0xfa0f3d63L), tole(0x8d080df5L),
 101tole(0x3b6e20c8L), tole(0x4c69105eL), tole(0xd56041e4L), tole(0xa2677172L),
 102tole(0x3c03e4d1L), tole(0x4b04d447L), tole(0xd20d85fdL), tole(0xa50ab56bL),
 103tole(0x35b5a8faL), tole(0x42b2986cL), tole(0xdbbbc9d6L), tole(0xacbcf940L),
 104tole(0x32d86ce3L), tole(0x45df5c75L), tole(0xdcd60dcfL), tole(0xabd13d59L),
 105tole(0x26d930acL), tole(0x51de003aL), tole(0xc8d75180L), tole(0xbfd06116L),
 106tole(0x21b4f4b5L), tole(0x56b3c423L), tole(0xcfba9599L), tole(0xb8bda50fL),
 107tole(0x2802b89eL), tole(0x5f058808L), tole(0xc60cd9b2L), tole(0xb10be924L),
 108tole(0x2f6f7c87L), tole(0x58684c11L), tole(0xc1611dabL), tole(0xb6662d3dL),
 109tole(0x76dc4190L), tole(0x01db7106L), tole(0x98d220bcL), tole(0xefd5102aL),
 110tole(0x71b18589L), tole(0x06b6b51fL), tole(0x9fbfe4a5L), tole(0xe8b8d433L),
 111tole(0x7807c9a2L), tole(0x0f00f934L), tole(0x9609a88eL), tole(0xe10e9818L),
 112tole(0x7f6a0dbbL), tole(0x086d3d2dL), tole(0x91646c97L), tole(0xe6635c01L),
 113tole(0x6b6b51f4L), tole(0x1c6c6162L), tole(0x856530d8L), tole(0xf262004eL),
 114tole(0x6c0695edL), tole(0x1b01a57bL), tole(0x8208f4c1L), tole(0xf50fc457L),
 115tole(0x65b0d9c6L), tole(0x12b7e950L), tole(0x8bbeb8eaL), tole(0xfcb9887cL),
 116tole(0x62dd1ddfL), tole(0x15da2d49L), tole(0x8cd37cf3L), tole(0xfbd44c65L),
 117tole(0x4db26158L), tole(0x3ab551ceL), tole(0xa3bc0074L), tole(0xd4bb30e2L),
 118tole(0x4adfa541L), tole(0x3dd895d7L), tole(0xa4d1c46dL), tole(0xd3d6f4fbL),
 119tole(0x4369e96aL), tole(0x346ed9fcL), tole(0xad678846L), tole(0xda60b8d0L),
 120tole(0x44042d73L), tole(0x33031de5L), tole(0xaa0a4c5fL), tole(0xdd0d7cc9L),
 121tole(0x5005713cL), tole(0x270241aaL), tole(0xbe0b1010L), tole(0xc90c2086L),
 122tole(0x5768b525L), tole(0x206f85b3L), tole(0xb966d409L), tole(0xce61e49fL),
 123tole(0x5edef90eL), tole(0x29d9c998L), tole(0xb0d09822L), tole(0xc7d7a8b4L),
 124tole(0x59b33d17L), tole(0x2eb40d81L), tole(0xb7bd5c3bL), tole(0xc0ba6cadL),
 125tole(0xedb88320L), tole(0x9abfb3b6L), tole(0x03b6e20cL), tole(0x74b1d29aL),
 126tole(0xead54739L), tole(0x9dd277afL), tole(0x04db2615L), tole(0x73dc1683L),
 127tole(0xe3630b12L), tole(0x94643b84L), tole(0x0d6d6a3eL), tole(0x7a6a5aa8L),
 128tole(0xe40ecf0bL), tole(0x9309ff9dL), tole(0x0a00ae27L), tole(0x7d079eb1L),
 129tole(0xf00f9344L), tole(0x8708a3d2L), tole(0x1e01f268L), tole(0x6906c2feL),
 130tole(0xf762575dL), tole(0x806567cbL), tole(0x196c3671L), tole(0x6e6b06e7L),
 131tole(0xfed41b76L), tole(0x89d32be0L), tole(0x10da7a5aL), tole(0x67dd4accL),
 132tole(0xf9b9df6fL), tole(0x8ebeeff9L), tole(0x17b7be43L), tole(0x60b08ed5L),
 133tole(0xd6d6a3e8L), tole(0xa1d1937eL), tole(0x38d8c2c4L), tole(0x4fdff252L),
 134tole(0xd1bb67f1L), tole(0xa6bc5767L), tole(0x3fb506ddL), tole(0x48b2364bL),
 135tole(0xd80d2bdaL), tole(0xaf0a1b4cL), tole(0x36034af6L), tole(0x41047a60L),
 136tole(0xdf60efc3L), tole(0xa867df55L), tole(0x316e8eefL), tole(0x4669be79L),
 137tole(0xcb61b38cL), tole(0xbc66831aL), tole(0x256fd2a0L), tole(0x5268e236L),
 138tole(0xcc0c7795L), tole(0xbb0b4703L), tole(0x220216b9L), tole(0x5505262fL),
 139tole(0xc5ba3bbeL), tole(0xb2bd0b28L), tole(0x2bb45a92L), tole(0x5cb36a04L),
 140tole(0xc2d7ffa7L), tole(0xb5d0cf31L), tole(0x2cd99e8bL), tole(0x5bdeae1dL),
 141tole(0x9b64c2b0L), tole(0xec63f226L), tole(0x756aa39cL), tole(0x026d930aL),
 142tole(0x9c0906a9L), tole(0xeb0e363fL), tole(0x72076785L), tole(0x05005713L),
 143tole(0x95bf4a82L), tole(0xe2b87a14L), tole(0x7bb12baeL), tole(0x0cb61b38L),
 144tole(0x92d28e9bL), tole(0xe5d5be0dL), tole(0x7cdcefb7L), tole(0x0bdbdf21L),
 145tole(0x86d3d2d4L), tole(0xf1d4e242L), tole(0x68ddb3f8L), tole(0x1fda836eL),
 146tole(0x81be16cdL), tole(0xf6b9265bL), tole(0x6fb077e1L), tole(0x18b74777L),
 147tole(0x88085ae6L), tole(0xff0f6a70L), tole(0x66063bcaL), tole(0x11010b5cL),
 148tole(0x8f659effL), tole(0xf862ae69L), tole(0x616bffd3L), tole(0x166ccf45L),
 149tole(0xa00ae278L), tole(0xd70dd2eeL), tole(0x4e048354L), tole(0x3903b3c2L),
 150tole(0xa7672661L), tole(0xd06016f7L), tole(0x4969474dL), tole(0x3e6e77dbL),
 151tole(0xaed16a4aL), tole(0xd9d65adcL), tole(0x40df0b66L), tole(0x37d83bf0L),
 152tole(0xa9bcae53L), tole(0xdebb9ec5L), tole(0x47b2cf7fL), tole(0x30b5ffe9L),
 153tole(0xbdbdf21cL), tole(0xcabac28aL), tole(0x53b39330L), tole(0x24b4a3a6L),
 154tole(0xbad03605L), tole(0xcdd70693L), tole(0x54de5729L), tole(0x23d967bfL),
 155tole(0xb3667a2eL), tole(0xc4614ab8L), tole(0x5d681b02L), tole(0x2a6f2b94L),
 156tole(0xb40bbe37L), tole(0xc30c8ea1L), tole(0x5a05df1bL), tole(0x2d02ef8dL)
 157};
 158#endif
 159
 160#if 0
 161/* =========================================================================
 162 * This function can be used by asm versions of crc32()
 163 */
 164const uint32_t * ZEXPORT get_crc_table()
 165{
 166#ifdef CONFIG_DYNAMIC_CRC_TABLE
 167  if (crc_table_empty) make_crc_table();
 168#endif
 169  return (const uint32_t *)crc_table;
 170}
 171#endif
 172
 173/* ========================================================================= */
 174# if __BYTE_ORDER == __LITTLE_ENDIAN
 175#  define DO_CRC(x) crc = tab[(crc ^ (x)) & 255] ^ (crc >> 8)
 176# else
 177#  define DO_CRC(x) crc = tab[((crc >> 24) ^ (x)) & 255] ^ (crc << 8)
 178# endif
 179
 180/* ========================================================================= */
 181
 182/* No ones complement version. JFFS2 (and other things ?)
 183 * don't use ones compliment in their CRC calculations.
 184 */
 185uint32_t __efi_runtime crc32_no_comp(uint32_t crc, const Bytef *buf, uInt len)
 186{
 187#ifdef CONFIG_ARM64_CRC32
 188    crc = cpu_to_le32(crc);
 189    while (len--)
 190        crc = __builtin_aarch64_crc32b(crc, *buf++);
 191    return le32_to_cpu(crc);
 192#else
 193    const uint32_t *tab = crc_table;
 194    const uint32_t *b =(const uint32_t *)buf;
 195    size_t rem_len;
 196#ifdef CONFIG_DYNAMIC_CRC_TABLE
 197    if (crc_table_empty)
 198      make_crc_table();
 199#endif
 200    crc = cpu_to_le32(crc);
 201    /* Align it */
 202    if (((long)b) & 3 && len) {
 203         uint8_t *p = (uint8_t *)b;
 204         do {
 205              DO_CRC(*p++);
 206         } while ((--len) && ((long)p)&3);
 207         b = (uint32_t *)p;
 208    }
 209
 210    rem_len = len & 3;
 211    len = len >> 2;
 212    for (--b; len; --len) {
 213         /* load data 32 bits wide, xor data 32 bits wide. */
 214         crc ^= *++b; /* use pre increment for speed */
 215         DO_CRC(0);
 216         DO_CRC(0);
 217         DO_CRC(0);
 218         DO_CRC(0);
 219    }
 220    len = rem_len;
 221    /* And the last few bytes */
 222    if (len) {
 223         uint8_t *p = (uint8_t *)(b + 1) - 1;
 224         do {
 225              DO_CRC(*++p); /* use pre increment for speed */
 226         } while (--len);
 227    }
 228
 229    return le32_to_cpu(crc);
 230#endif
 231}
 232#undef DO_CRC
 233
 234uint32_t __efi_runtime crc32(uint32_t crc, const Bytef *p, uInt len)
 235{
 236     return crc32_no_comp(crc ^ 0xffffffffL, p, len) ^ 0xffffffffL;
 237}
 238
 239/*
 240 * Calculate the crc32 checksum triggering the watchdog every 'chunk_sz' bytes
 241 * of input.
 242 */
 243uint32_t crc32_wd(uint32_t crc, const unsigned char *buf, uInt len,
 244                  uInt chunk_sz)
 245{
 246#if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
 247        const unsigned char *end, *curr;
 248        int chunk;
 249
 250        curr = buf;
 251        end = buf + len;
 252        while (curr < end) {
 253                chunk = end - curr;
 254                if (chunk > chunk_sz)
 255                        chunk = chunk_sz;
 256                crc = crc32(crc, curr, chunk);
 257                curr += chunk;
 258                WATCHDOG_RESET ();
 259        }
 260#else
 261        crc = crc32(crc, buf, len);
 262#endif
 263
 264        return crc;
 265}
 266
 267void crc32_wd_buf(const unsigned char *input, unsigned int ilen,
 268                unsigned char *output, unsigned int chunk_sz)
 269{
 270        uint32_t crc;
 271
 272        crc = crc32_wd(0, input, ilen, chunk_sz);
 273        crc = htonl(crc);
 274        memcpy(output, &crc, sizeof(crc));
 275}
 276