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
36 static int __efi_runtime_data crc_table_empty = 1;
37 static uint32_t __efi_runtime_data crc_table[256];
38 static 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 */
make_crc_table(void)64 static 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 #else
88 /* ========================================================================
89 * Table of CRC-32's of all single-byte values (made by make_crc_table)
90 */
91
92 static const uint32_t __efi_runtime_rodata crc_table[256] = {
93 tole(0x00000000L), tole(0x77073096L), tole(0xee0e612cL), tole(0x990951baL),
94 tole(0x076dc419L), tole(0x706af48fL), tole(0xe963a535L), tole(0x9e6495a3L),
95 tole(0x0edb8832L), tole(0x79dcb8a4L), tole(0xe0d5e91eL), tole(0x97d2d988L),
96 tole(0x09b64c2bL), tole(0x7eb17cbdL), tole(0xe7b82d07L), tole(0x90bf1d91L),
97 tole(0x1db71064L), tole(0x6ab020f2L), tole(0xf3b97148L), tole(0x84be41deL),
98 tole(0x1adad47dL), tole(0x6ddde4ebL), tole(0xf4d4b551L), tole(0x83d385c7L),
99 tole(0x136c9856L), tole(0x646ba8c0L), tole(0xfd62f97aL), tole(0x8a65c9ecL),
100 tole(0x14015c4fL), tole(0x63066cd9L), tole(0xfa0f3d63L), tole(0x8d080df5L),
101 tole(0x3b6e20c8L), tole(0x4c69105eL), tole(0xd56041e4L), tole(0xa2677172L),
102 tole(0x3c03e4d1L), tole(0x4b04d447L), tole(0xd20d85fdL), tole(0xa50ab56bL),
103 tole(0x35b5a8faL), tole(0x42b2986cL), tole(0xdbbbc9d6L), tole(0xacbcf940L),
104 tole(0x32d86ce3L), tole(0x45df5c75L), tole(0xdcd60dcfL), tole(0xabd13d59L),
105 tole(0x26d930acL), tole(0x51de003aL), tole(0xc8d75180L), tole(0xbfd06116L),
106 tole(0x21b4f4b5L), tole(0x56b3c423L), tole(0xcfba9599L), tole(0xb8bda50fL),
107 tole(0x2802b89eL), tole(0x5f058808L), tole(0xc60cd9b2L), tole(0xb10be924L),
108 tole(0x2f6f7c87L), tole(0x58684c11L), tole(0xc1611dabL), tole(0xb6662d3dL),
109 tole(0x76dc4190L), tole(0x01db7106L), tole(0x98d220bcL), tole(0xefd5102aL),
110 tole(0x71b18589L), tole(0x06b6b51fL), tole(0x9fbfe4a5L), tole(0xe8b8d433L),
111 tole(0x7807c9a2L), tole(0x0f00f934L), tole(0x9609a88eL), tole(0xe10e9818L),
112 tole(0x7f6a0dbbL), tole(0x086d3d2dL), tole(0x91646c97L), tole(0xe6635c01L),
113 tole(0x6b6b51f4L), tole(0x1c6c6162L), tole(0x856530d8L), tole(0xf262004eL),
114 tole(0x6c0695edL), tole(0x1b01a57bL), tole(0x8208f4c1L), tole(0xf50fc457L),
115 tole(0x65b0d9c6L), tole(0x12b7e950L), tole(0x8bbeb8eaL), tole(0xfcb9887cL),
116 tole(0x62dd1ddfL), tole(0x15da2d49L), tole(0x8cd37cf3L), tole(0xfbd44c65L),
117 tole(0x4db26158L), tole(0x3ab551ceL), tole(0xa3bc0074L), tole(0xd4bb30e2L),
118 tole(0x4adfa541L), tole(0x3dd895d7L), tole(0xa4d1c46dL), tole(0xd3d6f4fbL),
119 tole(0x4369e96aL), tole(0x346ed9fcL), tole(0xad678846L), tole(0xda60b8d0L),
120 tole(0x44042d73L), tole(0x33031de5L), tole(0xaa0a4c5fL), tole(0xdd0d7cc9L),
121 tole(0x5005713cL), tole(0x270241aaL), tole(0xbe0b1010L), tole(0xc90c2086L),
122 tole(0x5768b525L), tole(0x206f85b3L), tole(0xb966d409L), tole(0xce61e49fL),
123 tole(0x5edef90eL), tole(0x29d9c998L), tole(0xb0d09822L), tole(0xc7d7a8b4L),
124 tole(0x59b33d17L), tole(0x2eb40d81L), tole(0xb7bd5c3bL), tole(0xc0ba6cadL),
125 tole(0xedb88320L), tole(0x9abfb3b6L), tole(0x03b6e20cL), tole(0x74b1d29aL),
126 tole(0xead54739L), tole(0x9dd277afL), tole(0x04db2615L), tole(0x73dc1683L),
127 tole(0xe3630b12L), tole(0x94643b84L), tole(0x0d6d6a3eL), tole(0x7a6a5aa8L),
128 tole(0xe40ecf0bL), tole(0x9309ff9dL), tole(0x0a00ae27L), tole(0x7d079eb1L),
129 tole(0xf00f9344L), tole(0x8708a3d2L), tole(0x1e01f268L), tole(0x6906c2feL),
130 tole(0xf762575dL), tole(0x806567cbL), tole(0x196c3671L), tole(0x6e6b06e7L),
131 tole(0xfed41b76L), tole(0x89d32be0L), tole(0x10da7a5aL), tole(0x67dd4accL),
132 tole(0xf9b9df6fL), tole(0x8ebeeff9L), tole(0x17b7be43L), tole(0x60b08ed5L),
133 tole(0xd6d6a3e8L), tole(0xa1d1937eL), tole(0x38d8c2c4L), tole(0x4fdff252L),
134 tole(0xd1bb67f1L), tole(0xa6bc5767L), tole(0x3fb506ddL), tole(0x48b2364bL),
135 tole(0xd80d2bdaL), tole(0xaf0a1b4cL), tole(0x36034af6L), tole(0x41047a60L),
136 tole(0xdf60efc3L), tole(0xa867df55L), tole(0x316e8eefL), tole(0x4669be79L),
137 tole(0xcb61b38cL), tole(0xbc66831aL), tole(0x256fd2a0L), tole(0x5268e236L),
138 tole(0xcc0c7795L), tole(0xbb0b4703L), tole(0x220216b9L), tole(0x5505262fL),
139 tole(0xc5ba3bbeL), tole(0xb2bd0b28L), tole(0x2bb45a92L), tole(0x5cb36a04L),
140 tole(0xc2d7ffa7L), tole(0xb5d0cf31L), tole(0x2cd99e8bL), tole(0x5bdeae1dL),
141 tole(0x9b64c2b0L), tole(0xec63f226L), tole(0x756aa39cL), tole(0x026d930aL),
142 tole(0x9c0906a9L), tole(0xeb0e363fL), tole(0x72076785L), tole(0x05005713L),
143 tole(0x95bf4a82L), tole(0xe2b87a14L), tole(0x7bb12baeL), tole(0x0cb61b38L),
144 tole(0x92d28e9bL), tole(0xe5d5be0dL), tole(0x7cdcefb7L), tole(0x0bdbdf21L),
145 tole(0x86d3d2d4L), tole(0xf1d4e242L), tole(0x68ddb3f8L), tole(0x1fda836eL),
146 tole(0x81be16cdL), tole(0xf6b9265bL), tole(0x6fb077e1L), tole(0x18b74777L),
147 tole(0x88085ae6L), tole(0xff0f6a70L), tole(0x66063bcaL), tole(0x11010b5cL),
148 tole(0x8f659effL), tole(0xf862ae69L), tole(0x616bffd3L), tole(0x166ccf45L),
149 tole(0xa00ae278L), tole(0xd70dd2eeL), tole(0x4e048354L), tole(0x3903b3c2L),
150 tole(0xa7672661L), tole(0xd06016f7L), tole(0x4969474dL), tole(0x3e6e77dbL),
151 tole(0xaed16a4aL), tole(0xd9d65adcL), tole(0x40df0b66L), tole(0x37d83bf0L),
152 tole(0xa9bcae53L), tole(0xdebb9ec5L), tole(0x47b2cf7fL), tole(0x30b5ffe9L),
153 tole(0xbdbdf21cL), tole(0xcabac28aL), tole(0x53b39330L), tole(0x24b4a3a6L),
154 tole(0xbad03605L), tole(0xcdd70693L), tole(0x54de5729L), tole(0x23d967bfL),
155 tole(0xb3667a2eL), tole(0xc4614ab8L), tole(0x5d681b02L), tole(0x2a6f2b94L),
156 tole(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 */
164 const 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 */
crc32_no_comp(uint32_t crc,const Bytef * buf,uInt len)185 uint32_t __efi_runtime crc32_no_comp(uint32_t crc, const Bytef *buf, uInt len)
186 {
187 const uint32_t *tab = crc_table;
188 const uint32_t *b =(const uint32_t *)buf;
189 size_t rem_len;
190 #ifdef CONFIG_DYNAMIC_CRC_TABLE
191 if (crc_table_empty)
192 make_crc_table();
193 #endif
194 crc = cpu_to_le32(crc);
195 /* Align it */
196 if (((long)b) & 3 && len) {
197 uint8_t *p = (uint8_t *)b;
198 do {
199 DO_CRC(*p++);
200 } while ((--len) && ((long)p)&3);
201 b = (uint32_t *)p;
202 }
203
204 rem_len = len & 3;
205 len = len >> 2;
206 for (--b; len; --len) {
207 /* load data 32 bits wide, xor data 32 bits wide. */
208 crc ^= *++b; /* use pre increment for speed */
209 DO_CRC(0);
210 DO_CRC(0);
211 DO_CRC(0);
212 DO_CRC(0);
213 }
214 len = rem_len;
215 /* And the last few bytes */
216 if (len) {
217 uint8_t *p = (uint8_t *)(b + 1) - 1;
218 do {
219 DO_CRC(*++p); /* use pre increment for speed */
220 } while (--len);
221 }
222
223 return le32_to_cpu(crc);
224 }
225 #undef DO_CRC
226
crc32(uint32_t crc,const Bytef * p,uInt len)227 uint32_t __efi_runtime crc32(uint32_t crc, const Bytef *p, uInt len)
228 {
229 return crc32_no_comp(crc ^ 0xffffffffL, p, len) ^ 0xffffffffL;
230 }
231
232 /*
233 * Calculate the crc32 checksum triggering the watchdog every 'chunk_sz' bytes
234 * of input.
235 */
crc32_wd(uint32_t crc,const unsigned char * buf,uInt len,uInt chunk_sz)236 uint32_t crc32_wd(uint32_t crc, const unsigned char *buf, uInt len,
237 uInt chunk_sz)
238 {
239 #if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
240 const unsigned char *end, *curr;
241 int chunk;
242
243 curr = buf;
244 end = buf + len;
245 while (curr < end) {
246 chunk = end - curr;
247 if (chunk > chunk_sz)
248 chunk = chunk_sz;
249 crc = crc32(crc, curr, chunk);
250 curr += chunk;
251 WATCHDOG_RESET ();
252 }
253 #else
254 crc = crc32(crc, buf, len);
255 #endif
256
257 return crc;
258 }
259
crc32_wd_buf(const unsigned char * input,unsigned int ilen,unsigned char * output,unsigned int chunk_sz)260 void crc32_wd_buf(const unsigned char *input, unsigned int ilen,
261 unsigned char *output, unsigned int chunk_sz)
262 {
263 uint32_t crc;
264
265 crc = crc32_wd(0, input, ilen, chunk_sz);
266 crc = htonl(crc);
267 memcpy(output, &crc, sizeof(crc));
268 }
269