1/*
2 * There are multiple 16-bit CRC polynomials in common use, but this is
3 * *the* standard CRC-32 polynomial, first popularized by Ethernet.
4 * 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+x^0
5 */
6#define CRCPOLY_LE 0xedb88320
7#define CRCPOLY_BE 0x04c11db7
8
9/*
10 * This is the CRC32c polynomial, as outlined by Castagnoli.
11 * x^32+x^28+x^27+x^26+x^25+x^23+x^22+x^20+x^19+x^18+x^14+x^13+x^11+x^10+x^9+
12 * x^8+x^6+x^0
13 */
14#define CRC32C_POLY_LE 0x82F63B78
15#define CRC32C_POLY_BE 0x1EDC6F41
16
17/* How many bits at a time to use.  Valid values are 1, 2, 4, 8, 32 and 64. */
18/* For less performance-sensitive, use 4 */
19#ifndef CRC_LE_BITS
20# define CRC_LE_BITS 64
21#endif
22#ifndef CRC_BE_BITS
23# define CRC_BE_BITS 64
24#endif
25
26/*
27 * Little-endian CRC computation.  Used with serial bit streams sent
28 * lsbit-first.  Be sure to use cpu_to_le32() to append the computed CRC.
29 */
30#if CRC_LE_BITS > 64 || CRC_LE_BITS < 1 || CRC_LE_BITS == 16 || \
31	CRC_LE_BITS & CRC_LE_BITS-1
32# error "CRC_LE_BITS must be one of {1, 2, 4, 8, 32, 64}"
33#endif
34
35/*
36 * Big-endian CRC computation.  Used with serial bit streams sent
37 * msbit-first.  Be sure to use cpu_to_be32() to append the computed CRC.
38 */
39#if CRC_BE_BITS > 64 || CRC_BE_BITS < 1 || CRC_BE_BITS == 16 || \
40	CRC_BE_BITS & CRC_BE_BITS-1
41# error "CRC_BE_BITS must be one of {1, 2, 4, 8, 32, 64}"
42#endif
43
44
45#define ___constant_swab32(x) \
46	((uint32_t)( \
47		(((uint32_t)(x) & (uint32_t)0x000000ffUL) << 24) | \
48		(((uint32_t)(x) & (uint32_t)0x0000ff00UL) <<  8) | \
49		(((uint32_t)(x) & (uint32_t)0x00ff0000UL) >>  8) | \
50		(((uint32_t)(x) & (uint32_t)0xff000000UL) >> 24)))
51
52
53#if (__GNUC__ >= 3)
54#define likely(x)	__builtin_expect(!!(x), 1)
55#define unlikely(x)	__builtin_expect(!!(x), 0)
56#else
57#define likely(x)	(x)
58#define unlikely(x)	(x)
59#endif
60