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wdenkaffae2b2002-08-17 09:36:01 +00001/*
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
Joakim Tjernlund3ee8c122009-11-19 13:44:16 +010011#ifndef USE_HOSTCC
Jon Loeligerb3aff0c2007-07-10 11:19:50 -050012#include <common.h>
wdenkaffae2b2002-08-17 09:36:01 +000013#endif
Joakim Tjernlund3ee8c122009-11-19 13:44:16 +010014#include <compiler.h>
15#include <u-boot/crc.h>
wdenkaffae2b2002-08-17 09:36:01 +000016
Grant Ericksonf3b6d522008-05-06 16:18:00 -070017#if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
Bartlomiej Sieka1de6b282008-04-25 12:10:09 +020018#include <watchdog.h>
Grant Ericksonf3b6d522008-05-06 16:18:00 -070019#endif
Jean-Christophe PLAGNIOL-VILLARDa31e0912009-04-04 12:49:11 +020020#include "u-boot/zlib.h"
wdenkaffae2b2002-08-17 09:36:01 +000021
22#define local static
23#define ZEXPORT /* empty */
wdenkaffae2b2002-08-17 09:36:01 +000024
Joakim Tjernlund3ee8c122009-11-19 13:44:16 +010025#define tole(x) cpu_to_le32(x)
26
wdenkaffae2b2002-08-17 09:36:01 +000027#ifdef DYNAMIC_CRC_TABLE
28
29local int crc_table_empty = 1;
Mike Frysinger89cdab72008-03-31 11:02:01 -040030local uint32_t crc_table[256];
wdenkaffae2b2002-08-17 09:36:01 +000031local 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*/
57local void make_crc_table()
58{
Mike Frysinger89cdab72008-03-31 11:02:01 -040059 uint32_t c;
wdenkaffae2b2002-08-17 09:36:01 +000060 int n, k;
Wolfgang Denk7ed40112008-04-26 00:34:42 +020061 uLong poly; /* polynomial exclusive-or pattern */
wdenkaffae2b2002-08-17 09:36:01 +000062 /* 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;
Joakim Tjernlund3ee8c122009-11-19 13:44:16 +010075 crc_table[n] = tole(c);
wdenkaffae2b2002-08-17 09:36:01 +000076 }
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 */
Joakim Tjernlund3ee8c122009-11-19 13:44:16 +010083
Mike Frysinger89cdab72008-03-31 11:02:01 -040084local const uint32_t crc_table[256] = {
Joakim Tjernlund3ee8c122009-11-19 13:44:16 +010085tole(0x00000000L), tole(0x77073096L), tole(0xee0e612cL), tole(0x990951baL),
86tole(0x076dc419L), tole(0x706af48fL), tole(0xe963a535L), tole(0x9e6495a3L),
87tole(0x0edb8832L), tole(0x79dcb8a4L), tole(0xe0d5e91eL), tole(0x97d2d988L),
88tole(0x09b64c2bL), tole(0x7eb17cbdL), tole(0xe7b82d07L), tole(0x90bf1d91L),
89tole(0x1db71064L), tole(0x6ab020f2L), tole(0xf3b97148L), tole(0x84be41deL),
90tole(0x1adad47dL), tole(0x6ddde4ebL), tole(0xf4d4b551L), tole(0x83d385c7L),
91tole(0x136c9856L), tole(0x646ba8c0L), tole(0xfd62f97aL), tole(0x8a65c9ecL),
92tole(0x14015c4fL), tole(0x63066cd9L), tole(0xfa0f3d63L), tole(0x8d080df5L),
93tole(0x3b6e20c8L), tole(0x4c69105eL), tole(0xd56041e4L), tole(0xa2677172L),
94tole(0x3c03e4d1L), tole(0x4b04d447L), tole(0xd20d85fdL), tole(0xa50ab56bL),
95tole(0x35b5a8faL), tole(0x42b2986cL), tole(0xdbbbc9d6L), tole(0xacbcf940L),
96tole(0x32d86ce3L), tole(0x45df5c75L), tole(0xdcd60dcfL), tole(0xabd13d59L),
97tole(0x26d930acL), tole(0x51de003aL), tole(0xc8d75180L), tole(0xbfd06116L),
98tole(0x21b4f4b5L), tole(0x56b3c423L), tole(0xcfba9599L), tole(0xb8bda50fL),
99tole(0x2802b89eL), tole(0x5f058808L), tole(0xc60cd9b2L), tole(0xb10be924L),
100tole(0x2f6f7c87L), tole(0x58684c11L), tole(0xc1611dabL), tole(0xb6662d3dL),
101tole(0x76dc4190L), tole(0x01db7106L), tole(0x98d220bcL), tole(0xefd5102aL),
102tole(0x71b18589L), tole(0x06b6b51fL), tole(0x9fbfe4a5L), tole(0xe8b8d433L),
103tole(0x7807c9a2L), tole(0x0f00f934L), tole(0x9609a88eL), tole(0xe10e9818L),
104tole(0x7f6a0dbbL), tole(0x086d3d2dL), tole(0x91646c97L), tole(0xe6635c01L),
105tole(0x6b6b51f4L), tole(0x1c6c6162L), tole(0x856530d8L), tole(0xf262004eL),
106tole(0x6c0695edL), tole(0x1b01a57bL), tole(0x8208f4c1L), tole(0xf50fc457L),
107tole(0x65b0d9c6L), tole(0x12b7e950L), tole(0x8bbeb8eaL), tole(0xfcb9887cL),
108tole(0x62dd1ddfL), tole(0x15da2d49L), tole(0x8cd37cf3L), tole(0xfbd44c65L),
109tole(0x4db26158L), tole(0x3ab551ceL), tole(0xa3bc0074L), tole(0xd4bb30e2L),
110tole(0x4adfa541L), tole(0x3dd895d7L), tole(0xa4d1c46dL), tole(0xd3d6f4fbL),
111tole(0x4369e96aL), tole(0x346ed9fcL), tole(0xad678846L), tole(0xda60b8d0L),
112tole(0x44042d73L), tole(0x33031de5L), tole(0xaa0a4c5fL), tole(0xdd0d7cc9L),
113tole(0x5005713cL), tole(0x270241aaL), tole(0xbe0b1010L), tole(0xc90c2086L),
114tole(0x5768b525L), tole(0x206f85b3L), tole(0xb966d409L), tole(0xce61e49fL),
115tole(0x5edef90eL), tole(0x29d9c998L), tole(0xb0d09822L), tole(0xc7d7a8b4L),
116tole(0x59b33d17L), tole(0x2eb40d81L), tole(0xb7bd5c3bL), tole(0xc0ba6cadL),
117tole(0xedb88320L), tole(0x9abfb3b6L), tole(0x03b6e20cL), tole(0x74b1d29aL),
118tole(0xead54739L), tole(0x9dd277afL), tole(0x04db2615L), tole(0x73dc1683L),
119tole(0xe3630b12L), tole(0x94643b84L), tole(0x0d6d6a3eL), tole(0x7a6a5aa8L),
120tole(0xe40ecf0bL), tole(0x9309ff9dL), tole(0x0a00ae27L), tole(0x7d079eb1L),
121tole(0xf00f9344L), tole(0x8708a3d2L), tole(0x1e01f268L), tole(0x6906c2feL),
122tole(0xf762575dL), tole(0x806567cbL), tole(0x196c3671L), tole(0x6e6b06e7L),
123tole(0xfed41b76L), tole(0x89d32be0L), tole(0x10da7a5aL), tole(0x67dd4accL),
124tole(0xf9b9df6fL), tole(0x8ebeeff9L), tole(0x17b7be43L), tole(0x60b08ed5L),
125tole(0xd6d6a3e8L), tole(0xa1d1937eL), tole(0x38d8c2c4L), tole(0x4fdff252L),
126tole(0xd1bb67f1L), tole(0xa6bc5767L), tole(0x3fb506ddL), tole(0x48b2364bL),
127tole(0xd80d2bdaL), tole(0xaf0a1b4cL), tole(0x36034af6L), tole(0x41047a60L),
128tole(0xdf60efc3L), tole(0xa867df55L), tole(0x316e8eefL), tole(0x4669be79L),
129tole(0xcb61b38cL), tole(0xbc66831aL), tole(0x256fd2a0L), tole(0x5268e236L),
130tole(0xcc0c7795L), tole(0xbb0b4703L), tole(0x220216b9L), tole(0x5505262fL),
131tole(0xc5ba3bbeL), tole(0xb2bd0b28L), tole(0x2bb45a92L), tole(0x5cb36a04L),
132tole(0xc2d7ffa7L), tole(0xb5d0cf31L), tole(0x2cd99e8bL), tole(0x5bdeae1dL),
133tole(0x9b64c2b0L), tole(0xec63f226L), tole(0x756aa39cL), tole(0x026d930aL),
134tole(0x9c0906a9L), tole(0xeb0e363fL), tole(0x72076785L), tole(0x05005713L),
135tole(0x95bf4a82L), tole(0xe2b87a14L), tole(0x7bb12baeL), tole(0x0cb61b38L),
136tole(0x92d28e9bL), tole(0xe5d5be0dL), tole(0x7cdcefb7L), tole(0x0bdbdf21L),
137tole(0x86d3d2d4L), tole(0xf1d4e242L), tole(0x68ddb3f8L), tole(0x1fda836eL),
138tole(0x81be16cdL), tole(0xf6b9265bL), tole(0x6fb077e1L), tole(0x18b74777L),
139tole(0x88085ae6L), tole(0xff0f6a70L), tole(0x66063bcaL), tole(0x11010b5cL),
140tole(0x8f659effL), tole(0xf862ae69L), tole(0x616bffd3L), tole(0x166ccf45L),
141tole(0xa00ae278L), tole(0xd70dd2eeL), tole(0x4e048354L), tole(0x3903b3c2L),
142tole(0xa7672661L), tole(0xd06016f7L), tole(0x4969474dL), tole(0x3e6e77dbL),
143tole(0xaed16a4aL), tole(0xd9d65adcL), tole(0x40df0b66L), tole(0x37d83bf0L),
144tole(0xa9bcae53L), tole(0xdebb9ec5L), tole(0x47b2cf7fL), tole(0x30b5ffe9L),
145tole(0xbdbdf21cL), tole(0xcabac28aL), tole(0x53b39330L), tole(0x24b4a3a6L),
146tole(0xbad03605L), tole(0xcdd70693L), tole(0x54de5729L), tole(0x23d967bfL),
147tole(0xb3667a2eL), tole(0xc4614ab8L), tole(0x5d681b02L), tole(0x2a6f2b94L),
148tole(0xb40bbe37L), tole(0xc30c8ea1L), tole(0x5a05df1bL), tole(0x2d02ef8dL)
wdenkaffae2b2002-08-17 09:36:01 +0000149};
150#endif
151
152#if 0
153/* =========================================================================
154 * This function can be used by asm versions of crc32()
155 */
Mike Frysinger89cdab72008-03-31 11:02:01 -0400156const uint32_t * ZEXPORT get_crc_table()
wdenkaffae2b2002-08-17 09:36:01 +0000157{
158#ifdef DYNAMIC_CRC_TABLE
159 if (crc_table_empty) make_crc_table();
160#endif
Mike Frysinger89cdab72008-03-31 11:02:01 -0400161 return (const uint32_t *)crc_table;
wdenkaffae2b2002-08-17 09:36:01 +0000162}
163#endif
164
165/* ========================================================================= */
Jeff Angielski322ff392010-03-17 15:09:26 -0400166# if __BYTE_ORDER == __LITTLE_ENDIAN
Joakim Tjernlund3ee8c122009-11-19 13:44:16 +0100167# 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
wdenkaffae2b2002-08-17 09:36:01 +0000171
172/* ========================================================================= */
wdenkaffae2b2002-08-17 09:36:01 +0000173
174/* No ones complement version. JFFS2 (and other things ?)
175 * don't use ones compliment in their CRC calculations.
176 */
Mike Frysinger89cdab72008-03-31 11:02:01 -0400177uint32_t ZEXPORT crc32_no_comp(uint32_t crc, const Bytef *buf, uInt len)
wdenkaffae2b2002-08-17 09:36:01 +0000178{
Joakim Tjernlund3ee8c122009-11-19 13:44:16 +0100179 const uint32_t *tab = crc_table;
180 const uint32_t *b =(const uint32_t *)buf;
181 size_t rem_len;
wdenkaffae2b2002-08-17 09:36:01 +0000182#ifdef DYNAMIC_CRC_TABLE
183 if (crc_table_empty)
184 make_crc_table();
185#endif
Joakim Tjernlund3ee8c122009-11-19 13:44:16 +0100186 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;
wdenkaffae2b2002-08-17 09:36:01 +0000194 }
wdenkaffae2b2002-08-17 09:36:01 +0000195
Joakim Tjernlund3ee8c122009-11-19 13:44:16 +0100196 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);
wdenkaffae2b2002-08-17 09:36:01 +0000216}
Joakim Tjernlund3ee8c122009-11-19 13:44:16 +0100217#undef DO_CRC
wdenkaffae2b2002-08-17 09:36:01 +0000218
Joakim Tjernlund3ee8c122009-11-19 13:44:16 +0100219uint32_t ZEXPORT crc32 (uint32_t crc, const Bytef *p, uInt len)
220{
221 return crc32_no_comp(crc ^ 0xffffffffL, p, len) ^ 0xffffffffL;
222}
Bartlomiej Sieka215b01b2008-04-22 12:27:56 +0200223
224/*
225 * Calculate the crc32 checksum triggering the watchdog every 'chunk_sz' bytes
226 * of input.
227 */
Wolfgang Denk03ccdbc2008-04-25 11:52:21 +0200228uint32_t ZEXPORT crc32_wd (uint32_t crc,
229 const unsigned char *buf,
230 uInt len, uInt chunk_sz)
Bartlomiej Sieka215b01b2008-04-22 12:27:56 +0200231{
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
Wolfgang Denk7ed40112008-04-26 00:34:42 +0200247 crc = crc32 (crc, buf, len);
Bartlomiej Sieka215b01b2008-04-22 12:27:56 +0200248#endif
249
250 return crc;
251}
Simon Glassd20a40d2013-02-24 20:30:22 +0000252
253void crc32_wd_buf(const unsigned char *input, unsigned int ilen,
254 unsigned char *output, unsigned int chunk_sz)
255{
256 uint32_t crc;
257
258 crc = crc32_wd(0, input, ilen, chunk_sz);
259 memcpy(output, &crc, sizeof(crc));
260}