crc32defs.h (1619B)
1/* SPDX-License-Identifier: GPL-2.0 */ 2 3/* Try to choose an implementation variant via Kconfig */ 4#ifdef CONFIG_CRC32_SLICEBY8 5# define CRC_LE_BITS 64 6# define CRC_BE_BITS 64 7#endif 8#ifdef CONFIG_CRC32_SLICEBY4 9# define CRC_LE_BITS 32 10# define CRC_BE_BITS 32 11#endif 12#ifdef CONFIG_CRC32_SARWATE 13# define CRC_LE_BITS 8 14# define CRC_BE_BITS 8 15#endif 16#ifdef CONFIG_CRC32_BIT 17# define CRC_LE_BITS 1 18# define CRC_BE_BITS 1 19#endif 20 21/* 22 * How many bits at a time to use. Valid values are 1, 2, 4, 8, 32 and 64. 23 * For less performance-sensitive, use 4 or 8 to save table size. 24 * For larger systems choose same as CPU architecture as default. 25 * This works well on X86_64, SPARC64 systems. This may require some 26 * elaboration after experiments with other architectures. 27 */ 28#ifndef CRC_LE_BITS 29# ifdef CONFIG_64BIT 30# define CRC_LE_BITS 64 31# else 32# define CRC_LE_BITS 32 33# endif 34#endif 35#ifndef CRC_BE_BITS 36# ifdef CONFIG_64BIT 37# define CRC_BE_BITS 64 38# else 39# define CRC_BE_BITS 32 40# endif 41#endif 42 43/* 44 * Little-endian CRC computation. Used with serial bit streams sent 45 * lsbit-first. Be sure to use cpu_to_le32() to append the computed CRC. 46 */ 47#if CRC_LE_BITS > 64 || CRC_LE_BITS < 1 || CRC_LE_BITS == 16 || \ 48 CRC_LE_BITS & CRC_LE_BITS-1 49# error "CRC_LE_BITS must be one of {1, 2, 4, 8, 32, 64}" 50#endif 51 52/* 53 * Big-endian CRC computation. Used with serial bit streams sent 54 * msbit-first. Be sure to use cpu_to_be32() to append the computed CRC. 55 */ 56#if CRC_BE_BITS > 64 || CRC_BE_BITS < 1 || CRC_BE_BITS == 16 || \ 57 CRC_BE_BITS & CRC_BE_BITS-1 58# error "CRC_BE_BITS must be one of {1, 2, 4, 8, 32, 64}" 59#endif