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59 lines
1.6 KiB
59 lines
1.6 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* Try to choose an implementation variant via Kconfig */ |
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#ifdef CONFIG_CRC32_SLICEBY8 |
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# define CRC_LE_BITS 64 |
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# define CRC_BE_BITS 64 |
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#endif |
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#ifdef CONFIG_CRC32_SLICEBY4 |
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# define CRC_LE_BITS 32 |
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# define CRC_BE_BITS 32 |
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#endif |
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#ifdef CONFIG_CRC32_SARWATE |
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# define CRC_LE_BITS 8 |
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# define CRC_BE_BITS 8 |
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#endif |
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#ifdef CONFIG_CRC32_BIT |
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# define CRC_LE_BITS 1 |
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# define CRC_BE_BITS 1 |
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#endif |
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/* |
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* How many bits at a time to use. Valid values are 1, 2, 4, 8, 32 and 64. |
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* For less performance-sensitive, use 4 or 8 to save table size. |
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* For larger systems choose same as CPU architecture as default. |
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* This works well on X86_64, SPARC64 systems. This may require some |
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* elaboration after experiments with other architectures. |
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*/ |
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#ifndef CRC_LE_BITS |
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# ifdef CONFIG_64BIT |
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# define CRC_LE_BITS 64 |
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# else |
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# define CRC_LE_BITS 32 |
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# endif |
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#endif |
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#ifndef CRC_BE_BITS |
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# ifdef CONFIG_64BIT |
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# define CRC_BE_BITS 64 |
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# else |
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# define CRC_BE_BITS 32 |
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# endif |
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#endif |
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/* |
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* Little-endian CRC computation. Used with serial bit streams sent |
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* lsbit-first. Be sure to use cpu_to_le32() to append the computed CRC. |
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*/ |
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#if CRC_LE_BITS > 64 || CRC_LE_BITS < 1 || CRC_LE_BITS == 16 || \ |
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CRC_LE_BITS & CRC_LE_BITS-1 |
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# error "CRC_LE_BITS must be one of {1, 2, 4, 8, 32, 64}" |
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#endif |
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/* |
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* Big-endian CRC computation. Used with serial bit streams sent |
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* msbit-first. Be sure to use cpu_to_be32() to append the computed CRC. |
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*/ |
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#if CRC_BE_BITS > 64 || CRC_BE_BITS < 1 || CRC_BE_BITS == 16 || \ |
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CRC_BE_BITS & CRC_BE_BITS-1 |
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# error "CRC_BE_BITS must be one of {1, 2, 4, 8, 32, 64}" |
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#endif
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