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