diff options
Diffstat (limited to 'include/linux/crc32.h')
| -rw-r--r-- | include/linux/crc32.h | 77 |
1 files changed, 55 insertions, 22 deletions
diff --git a/include/linux/crc32.h b/include/linux/crc32.h index 87f788c0d607..69c2e8bb3782 100644 --- a/include/linux/crc32.h +++ b/include/linux/crc32.h @@ -8,10 +8,48 @@ #include <linux/types.h> #include <linux/bitrev.h> -u32 __pure crc32_le(u32 crc, unsigned char const *p, size_t len); -u32 __pure crc32_le_base(u32 crc, unsigned char const *p, size_t len); -u32 __pure crc32_be(u32 crc, unsigned char const *p, size_t len); -u32 __pure crc32_be_base(u32 crc, unsigned char const *p, size_t len); +u32 crc32_le_arch(u32 crc, const u8 *p, size_t len); +u32 crc32_le_base(u32 crc, const u8 *p, size_t len); +u32 crc32_be_arch(u32 crc, const u8 *p, size_t len); +u32 crc32_be_base(u32 crc, const u8 *p, size_t len); +u32 crc32c_arch(u32 crc, const u8 *p, size_t len); +u32 crc32c_base(u32 crc, const u8 *p, size_t len); + +static inline u32 crc32_le(u32 crc, const void *p, size_t len) +{ + if (IS_ENABLED(CONFIG_CRC32_ARCH)) + return crc32_le_arch(crc, p, len); + return crc32_le_base(crc, p, len); +} + +static inline u32 crc32_be(u32 crc, const void *p, size_t len) +{ + if (IS_ENABLED(CONFIG_CRC32_ARCH)) + return crc32_be_arch(crc, p, len); + return crc32_be_base(crc, p, len); +} + +static inline u32 crc32c(u32 crc, const void *p, size_t len) +{ + if (IS_ENABLED(CONFIG_CRC32_ARCH)) + return crc32c_arch(crc, p, len); + return crc32c_base(crc, p, len); +} + +/* + * crc32_optimizations() returns flags that indicate which CRC32 library + * functions are using architecture-specific optimizations. Unlike + * IS_ENABLED(CONFIG_CRC32_ARCH) it takes into account the different CRC32 + * variants and also whether any needed CPU features are available at runtime. + */ +#define CRC32_LE_OPTIMIZATION BIT(0) /* crc32_le() is optimized */ +#define CRC32_BE_OPTIMIZATION BIT(1) /* crc32_be() is optimized */ +#define CRC32C_OPTIMIZATION BIT(2) /* crc32c() is optimized */ +#if IS_ENABLED(CONFIG_CRC32_ARCH) +u32 crc32_optimizations(void); +#else +static inline u32 crc32_optimizations(void) { return 0; } +#endif /** * crc32_le_combine - Combine two crc32 check values into one. For two @@ -31,39 +69,34 @@ u32 __pure crc32_be_base(u32 crc, unsigned char const *p, size_t len); * with the same initializer as crc1, and crc2 seed was 0. See * also crc32_combine_test(). */ -u32 __attribute_const__ crc32_le_shift(u32 crc, size_t len); +u32 crc32_le_shift(u32 crc, size_t len); static inline u32 crc32_le_combine(u32 crc1, u32 crc2, size_t len2) { return crc32_le_shift(crc1, len2) ^ crc2; } -u32 __pure __crc32c_le(u32 crc, unsigned char const *p, size_t len); -u32 __pure __crc32c_le_base(u32 crc, unsigned char const *p, size_t len); +u32 crc32c_shift(u32 crc, size_t len); /** - * __crc32c_le_combine - Combine two crc32c check values into one. For two - * sequences of bytes, seq1 and seq2 with lengths len1 - * and len2, __crc32c_le() check values were calculated - * for each, crc1 and crc2. + * crc32c_combine - Combine two crc32c check values into one. For two sequences + * of bytes, seq1 and seq2 with lengths len1 and len2, crc32c() + * check values were calculated for each, crc1 and crc2. * * @crc1: crc32c of the first block * @crc2: crc32c of the second block * @len2: length of the second block * - * Return: The __crc32c_le() check value of seq1 and seq2 concatenated, - * requiring only crc1, crc2, and len2. Note: If seq_full denotes - * the concatenated memory area of seq1 with seq2, and crc_full - * the __crc32c_le() value of seq_full, then crc_full == - * __crc32c_le_combine(crc1, crc2, len2) when crc_full was - * seeded with the same initializer as crc1, and crc2 seed - * was 0. See also crc32c_combine_test(). + * Return: The crc32c() check value of seq1 and seq2 concatenated, requiring + * only crc1, crc2, and len2. Note: If seq_full denotes the concatenated + * memory area of seq1 with seq2, and crc_full the crc32c() value of + * seq_full, then crc_full == crc32c_combine(crc1, crc2, len2) when + * crc_full was seeded with the same initializer as crc1, and crc2 seed + * was 0. See also crc_combine_test(). */ -u32 __attribute_const__ __crc32c_le_shift(u32 crc, size_t len); - -static inline u32 __crc32c_le_combine(u32 crc1, u32 crc2, size_t len2) +static inline u32 crc32c_combine(u32 crc1, u32 crc2, size_t len2) { - return __crc32c_le_shift(crc1, len2) ^ crc2; + return crc32c_shift(crc1, len2) ^ crc2; } #define crc32(seed, data, length) crc32_le(seed, (unsigned char const *)(data), length) |