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