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
34 static int __efi_runtime_data crc_table_empty = 1;
35 static uint32_t __efi_runtime_data crc_table[256];
36 static 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 */
make_crc_table(void)62 static 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
90 static const uint32_t __efi_runtime_rodata crc_table[256] = {
91 tole(0x00000000L), tole(0x77073096L), tole(0xee0e612cL), tole(0x990951baL),
92 tole(0x076dc419L), tole(0x706af48fL), tole(0xe963a535L), tole(0x9e6495a3L),
93 tole(0x0edb8832L), tole(0x79dcb8a4L), tole(0xe0d5e91eL), tole(0x97d2d988L),
94 tole(0x09b64c2bL), tole(0x7eb17cbdL), tole(0xe7b82d07L), tole(0x90bf1d91L),
95 tole(0x1db71064L), tole(0x6ab020f2L), tole(0xf3b97148L), tole(0x84be41deL),
96 tole(0x1adad47dL), tole(0x6ddde4ebL), tole(0xf4d4b551L), tole(0x83d385c7L),
97 tole(0x136c9856L), tole(0x646ba8c0L), tole(0xfd62f97aL), tole(0x8a65c9ecL),
98 tole(0x14015c4fL), tole(0x63066cd9L), tole(0xfa0f3d63L), tole(0x8d080df5L),
99 tole(0x3b6e20c8L), tole(0x4c69105eL), tole(0xd56041e4L), tole(0xa2677172L),
100 tole(0x3c03e4d1L), tole(0x4b04d447L), tole(0xd20d85fdL), tole(0xa50ab56bL),
101 tole(0x35b5a8faL), tole(0x42b2986cL), tole(0xdbbbc9d6L), tole(0xacbcf940L),
102 tole(0x32d86ce3L), tole(0x45df5c75L), tole(0xdcd60dcfL), tole(0xabd13d59L),
103 tole(0x26d930acL), tole(0x51de003aL), tole(0xc8d75180L), tole(0xbfd06116L),
104 tole(0x21b4f4b5L), tole(0x56b3c423L), tole(0xcfba9599L), tole(0xb8bda50fL),
105 tole(0x2802b89eL), tole(0x5f058808L), tole(0xc60cd9b2L), tole(0xb10be924L),
106 tole(0x2f6f7c87L), tole(0x58684c11L), tole(0xc1611dabL), tole(0xb6662d3dL),
107 tole(0x76dc4190L), tole(0x01db7106L), tole(0x98d220bcL), tole(0xefd5102aL),
108 tole(0x71b18589L), tole(0x06b6b51fL), tole(0x9fbfe4a5L), tole(0xe8b8d433L),
109 tole(0x7807c9a2L), tole(0x0f00f934L), tole(0x9609a88eL), tole(0xe10e9818L),
110 tole(0x7f6a0dbbL), tole(0x086d3d2dL), tole(0x91646c97L), tole(0xe6635c01L),
111 tole(0x6b6b51f4L), tole(0x1c6c6162L), tole(0x856530d8L), tole(0xf262004eL),
112 tole(0x6c0695edL), tole(0x1b01a57bL), tole(0x8208f4c1L), tole(0xf50fc457L),
113 tole(0x65b0d9c6L), tole(0x12b7e950L), tole(0x8bbeb8eaL), tole(0xfcb9887cL),
114 tole(0x62dd1ddfL), tole(0x15da2d49L), tole(0x8cd37cf3L), tole(0xfbd44c65L),
115 tole(0x4db26158L), tole(0x3ab551ceL), tole(0xa3bc0074L), tole(0xd4bb30e2L),
116 tole(0x4adfa541L), tole(0x3dd895d7L), tole(0xa4d1c46dL), tole(0xd3d6f4fbL),
117 tole(0x4369e96aL), tole(0x346ed9fcL), tole(0xad678846L), tole(0xda60b8d0L),
118 tole(0x44042d73L), tole(0x33031de5L), tole(0xaa0a4c5fL), tole(0xdd0d7cc9L),
119 tole(0x5005713cL), tole(0x270241aaL), tole(0xbe0b1010L), tole(0xc90c2086L),
120 tole(0x5768b525L), tole(0x206f85b3L), tole(0xb966d409L), tole(0xce61e49fL),
121 tole(0x5edef90eL), tole(0x29d9c998L), tole(0xb0d09822L), tole(0xc7d7a8b4L),
122 tole(0x59b33d17L), tole(0x2eb40d81L), tole(0xb7bd5c3bL), tole(0xc0ba6cadL),
123 tole(0xedb88320L), tole(0x9abfb3b6L), tole(0x03b6e20cL), tole(0x74b1d29aL),
124 tole(0xead54739L), tole(0x9dd277afL), tole(0x04db2615L), tole(0x73dc1683L),
125 tole(0xe3630b12L), tole(0x94643b84L), tole(0x0d6d6a3eL), tole(0x7a6a5aa8L),
126 tole(0xe40ecf0bL), tole(0x9309ff9dL), tole(0x0a00ae27L), tole(0x7d079eb1L),
127 tole(0xf00f9344L), tole(0x8708a3d2L), tole(0x1e01f268L), tole(0x6906c2feL),
128 tole(0xf762575dL), tole(0x806567cbL), tole(0x196c3671L), tole(0x6e6b06e7L),
129 tole(0xfed41b76L), tole(0x89d32be0L), tole(0x10da7a5aL), tole(0x67dd4accL),
130 tole(0xf9b9df6fL), tole(0x8ebeeff9L), tole(0x17b7be43L), tole(0x60b08ed5L),
131 tole(0xd6d6a3e8L), tole(0xa1d1937eL), tole(0x38d8c2c4L), tole(0x4fdff252L),
132 tole(0xd1bb67f1L), tole(0xa6bc5767L), tole(0x3fb506ddL), tole(0x48b2364bL),
133 tole(0xd80d2bdaL), tole(0xaf0a1b4cL), tole(0x36034af6L), tole(0x41047a60L),
134 tole(0xdf60efc3L), tole(0xa867df55L), tole(0x316e8eefL), tole(0x4669be79L),
135 tole(0xcb61b38cL), tole(0xbc66831aL), tole(0x256fd2a0L), tole(0x5268e236L),
136 tole(0xcc0c7795L), tole(0xbb0b4703L), tole(0x220216b9L), tole(0x5505262fL),
137 tole(0xc5ba3bbeL), tole(0xb2bd0b28L), tole(0x2bb45a92L), tole(0x5cb36a04L),
138 tole(0xc2d7ffa7L), tole(0xb5d0cf31L), tole(0x2cd99e8bL), tole(0x5bdeae1dL),
139 tole(0x9b64c2b0L), tole(0xec63f226L), tole(0x756aa39cL), tole(0x026d930aL),
140 tole(0x9c0906a9L), tole(0xeb0e363fL), tole(0x72076785L), tole(0x05005713L),
141 tole(0x95bf4a82L), tole(0xe2b87a14L), tole(0x7bb12baeL), tole(0x0cb61b38L),
142 tole(0x92d28e9bL), tole(0xe5d5be0dL), tole(0x7cdcefb7L), tole(0x0bdbdf21L),
143 tole(0x86d3d2d4L), tole(0xf1d4e242L), tole(0x68ddb3f8L), tole(0x1fda836eL),
144 tole(0x81be16cdL), tole(0xf6b9265bL), tole(0x6fb077e1L), tole(0x18b74777L),
145 tole(0x88085ae6L), tole(0xff0f6a70L), tole(0x66063bcaL), tole(0x11010b5cL),
146 tole(0x8f659effL), tole(0xf862ae69L), tole(0x616bffd3L), tole(0x166ccf45L),
147 tole(0xa00ae278L), tole(0xd70dd2eeL), tole(0x4e048354L), tole(0x3903b3c2L),
148 tole(0xa7672661L), tole(0xd06016f7L), tole(0x4969474dL), tole(0x3e6e77dbL),
149 tole(0xaed16a4aL), tole(0xd9d65adcL), tole(0x40df0b66L), tole(0x37d83bf0L),
150 tole(0xa9bcae53L), tole(0xdebb9ec5L), tole(0x47b2cf7fL), tole(0x30b5ffe9L),
151 tole(0xbdbdf21cL), tole(0xcabac28aL), tole(0x53b39330L), tole(0x24b4a3a6L),
152 tole(0xbad03605L), tole(0xcdd70693L), tole(0x54de5729L), tole(0x23d967bfL),
153 tole(0xb3667a2eL), tole(0xc4614ab8L), tole(0x5d681b02L), tole(0x2a6f2b94L),
154 tole(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 */
162 const 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 */
crc32_no_comp(uint32_t crc,const Bytef * buf,uInt len)183 uint32_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
crc32(uint32_t crc,const Bytef * p,uInt len)232 uint32_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 */
crc32_wd(uint32_t crc,const unsigned char * buf,uInt len,uInt chunk_sz)241 uint32_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
crc32_wd_buf(const unsigned char * input,unsigned int ilen,unsigned char * output,unsigned int chunk_sz)265 void 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