| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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| 2 | /* |
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| 3 | * See lib/crc64.c for the related specification and polynomial arithmetic. |
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| 4 | */ |
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| 5 | #ifndef _LINUX_CRC64_H |
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| 6 | #define _LINUX_CRC64_H |
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| 7 | |
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| 8 | #include <linux/types.h> |
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| 9 | |
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| 10 | u64 crc64_be_arch(u64 crc, const u8 *p, size_t len); |
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| 11 | u64 crc64_be_generic(u64 crc, const u8 *p, size_t len); |
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| 12 | u64 crc64_nvme_arch(u64 crc, const u8 *p, size_t len); |
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| 13 | u64 crc64_nvme_generic(u64 crc, const u8 *p, size_t len); |
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| 14 | |
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| 15 | /** |
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| 16 | * crc64_be - Calculate bitwise big-endian ECMA-182 CRC64 |
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| 17 | * @crc: seed value for computation. 0 or (u64)~0 for a new CRC calculation, |
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| 18 | * or the previous crc64 value if computing incrementally. |
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| 19 | * @p: pointer to buffer over which CRC64 is run |
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| 20 | * @len: length of buffer @p |
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| 21 | */ |
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| 22 | static inline u64 crc64_be(u64 crc, const void *p, size_t len) |
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| 23 | { |
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| 24 | if (IS_ENABLED(CONFIG_CRC64_ARCH)) |
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| 25 | return crc64_be_arch(crc, p, len); |
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| 26 | return crc64_be_generic(crc, p, len); |
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| 27 | } |
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| 28 | |
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| 29 | /** |
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| 30 | * crc64_nvme - Calculate CRC64-NVME |
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| 31 | * @crc: seed value for computation. 0 for a new CRC calculation, or the |
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| 32 | * previous crc64 value if computing incrementally. |
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| 33 | * @p: pointer to buffer over which CRC64 is run |
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| 34 | * @len: length of buffer @p |
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| 35 | * |
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| 36 | * This computes the CRC64 defined in the NVME NVM Command Set Specification, |
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| 37 | * *including the bitwise inversion at the beginning and end*. |
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| 38 | */ |
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| 39 | static inline u64 crc64_nvme(u64 crc, const void *p, size_t len) |
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| 40 | { |
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| 41 | if (IS_ENABLED(CONFIG_CRC64_ARCH)) |
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| 42 | return ~crc64_nvme_arch(crc: ~crc, p, len); |
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| 43 | return ~crc64_nvme_generic(crc: ~crc, p, len); |
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| 44 | } |
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| 45 | |
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| 46 | #endif /* _LINUX_CRC64_H */ |
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| 47 | |
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