1e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall/* 2e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall * This is the CRC32c polynomial, as outlined by Castagnoli. 3e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall * 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+ 4e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall * x^8+x^6+x^0 5e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall */ 6e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall#define CRCPOLY_LE 0x82F63B78 7e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall#define CRCPOLY_BE 0x1EDC6F41 8e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall 9e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall/* How many bits at a time to use. Valid values are 1, 2, 4, 8, 32 and 64. */ 10e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall/* For less performance-sensitive, use 4 */ 11e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall#ifndef CRC_LE_BITS 12e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall# define CRC_LE_BITS 64 13e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall#endif 14e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall#ifndef CRC_BE_BITS 15e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall# define CRC_BE_BITS 64 16e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall#endif 17e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall 18e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall/* 19e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall * Little-endian CRC computation. Used with serial bit streams sent 20e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall * lsbit-first. Be sure to use cpu_to_le32() to append the computed CRC. 21e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall */ 22e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall#if CRC_LE_BITS > 64 || CRC_LE_BITS < 1 || CRC_LE_BITS == 16 || \ 23e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall CRC_LE_BITS & CRC_LE_BITS-1 24e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall# error "CRC_LE_BITS must be one of {1, 2, 4, 8, 32, 64}" 25e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall#endif 26e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall 27e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall/* 28e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall * Big-endian CRC computation. Used with serial bit streams sent 29e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall * msbit-first. Be sure to use cpu_to_be32() to append the computed CRC. 30e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall */ 31e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall#if CRC_BE_BITS > 64 || CRC_BE_BITS < 1 || CRC_BE_BITS == 16 || \ 32e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall CRC_BE_BITS & CRC_BE_BITS-1 33e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall# error "CRC_BE_BITS must be one of {1, 2, 4, 8, 32, 64}" 34e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall#endif 35e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall 36e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall 37e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall#define ___constant_swab32(x) \ 38e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall ((uint32_t)( \ 39e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall (((uint32_t)(x) & (uint32_t)0x000000ffUL) << 24) | \ 40e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall (((uint32_t)(x) & (uint32_t)0x0000ff00UL) << 8) | \ 41e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall (((uint32_t)(x) & (uint32_t)0x00ff0000UL) >> 8) | \ 42e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall (((uint32_t)(x) & (uint32_t)0xff000000UL) >> 24))) 43e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall 44e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall 45e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall#if (__GNUC__ >= 3) 46e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall#define likely(x) __builtin_expect(!!(x), 1) 47e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall#define unlikely(x) __builtin_expect(!!(x), 0) 48e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall#else 49e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall#define likely(x) (x) 50e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall#define unlikely(x) (x) 51e0ed7404719a9ddd2ba427a80db5365c8bad18c0JP Abgrall#endif 52