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b5943815e6
Move the riscv-optimized CRC code from arch/riscv/lib/crc* into its new location in lib/crc/riscv/, and wire it up in the new way. This new way of organizing the CRC code eliminates the need to artificially split the code for each CRC variant into separate arch and generic modules, enabling better inlining and dead code elimination. For more details, see "lib/crc: Prepare for arch-optimized code in subdirs of lib/crc/". Reviewed-by: "Martin K. Petersen" <martin.petersen@oracle.com> Acked-by: Ingo Molnar <mingo@kernel.org> Acked-by: "Jason A. Donenfeld" <Jason@zx2c4.com> Link: https://lore.kernel.org/r/20250607200454.73587-9-ebiggers@kernel.org Signed-off-by: Eric Biggers <ebiggers@kernel.org>
44 lines
1.1 KiB
C
44 lines
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* RISC-V optimized CRC32 functions
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*
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* Copyright 2025 Google LLC
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*/
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#include <asm/hwcap.h>
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#include <asm/alternative-macros.h>
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#include "crc-clmul.h"
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static inline u32 crc32_le_arch(u32 crc, const u8 *p, size_t len)
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{
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if (riscv_has_extension_likely(RISCV_ISA_EXT_ZBC))
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return crc32_lsb_clmul(crc, p, len,
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&crc32_lsb_0xedb88320_consts);
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return crc32_le_base(crc, p, len);
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}
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static inline u32 crc32_be_arch(u32 crc, const u8 *p, size_t len)
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{
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if (riscv_has_extension_likely(RISCV_ISA_EXT_ZBC))
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return crc32_msb_clmul(crc, p, len,
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&crc32_msb_0x04c11db7_consts);
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return crc32_be_base(crc, p, len);
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}
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static inline u32 crc32c_arch(u32 crc, const u8 *p, size_t len)
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{
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if (riscv_has_extension_likely(RISCV_ISA_EXT_ZBC))
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return crc32_lsb_clmul(crc, p, len,
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&crc32_lsb_0x82f63b78_consts);
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return crc32c_base(crc, p, len);
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}
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static inline u32 crc32_optimizations_arch(void)
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{
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if (riscv_has_extension_likely(RISCV_ISA_EXT_ZBC))
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return CRC32_LE_OPTIMIZATION |
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CRC32_BE_OPTIMIZATION |
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CRC32C_OPTIMIZATION;
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return 0;
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}
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