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