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 #elif !defined(CONFIG_ARM64_CRC32)
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 #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
crc32(uint32_t crc,const Bytef * p,uInt len)234 uint32_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 */
crc32_wd(uint32_t crc,const unsigned char * buf,uInt len,uInt chunk_sz)243 uint32_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
crc32_wd_buf(const unsigned char * input,unsigned int ilen,unsigned char * output,unsigned int chunk_sz)267 void 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