1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * RISC-V optimized CRC32 functions 4 * 5 * Copyright 2025 Google LLC 6 */ 7 8 #include <asm/hwcap.h> 9 #include <asm/alternative-macros.h> 10 11 #include "crc-clmul.h" 12 13 static inline u32 crc32_le_arch(u32 crc, const u8 *p, size_t len) 14 { 15 if (riscv_has_extension_likely(RISCV_ISA_EXT_ZBC)) 16 return crc32_lsb_clmul(crc, p, len, 17 &crc32_lsb_0xedb88320_consts); 18 return crc32_le_base(crc, p, len); 19 } 20 21 static inline u32 crc32_be_arch(u32 crc, const u8 *p, size_t len) 22 { 23 if (riscv_has_extension_likely(RISCV_ISA_EXT_ZBC)) 24 return crc32_msb_clmul(crc, p, len, 25 &crc32_msb_0x04c11db7_consts); 26 return crc32_be_base(crc, p, len); 27 } 28 29 static inline u32 crc32c_arch(u32 crc, const u8 *p, size_t len) 30 { 31 if (riscv_has_extension_likely(RISCV_ISA_EXT_ZBC)) 32 return crc32_lsb_clmul(crc, p, len, 33 &crc32_lsb_0x82f63b78_consts); 34 return crc32c_base(crc, p, len); 35 } 36 37 static inline u32 crc32_optimizations_arch(void) 38 { 39 if (riscv_has_extension_likely(RISCV_ISA_EXT_ZBC)) 40 return CRC32_LE_OPTIMIZATION | 41 CRC32_BE_OPTIMIZATION | 42 CRC32C_OPTIMIZATION; 43 return 0; 44 } 45