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