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 #include <linux/crc32.h> 11 #include <linux/module.h> 12 13 #include "crc-clmul.h" 14 15 u32 crc32_le_arch(u32 crc, const u8 *p, size_t len) 16 { 17 if (riscv_has_extension_likely(RISCV_ISA_EXT_ZBC)) 18 return crc32_lsb_clmul(crc, p, len, 19 &crc32_lsb_0xedb88320_consts); 20 return crc32_le_base(crc, p, len); 21 } 22 EXPORT_SYMBOL(crc32_le_arch); 23 24 u32 crc32_be_arch(u32 crc, const u8 *p, size_t len) 25 { 26 if (riscv_has_extension_likely(RISCV_ISA_EXT_ZBC)) 27 return crc32_msb_clmul(crc, p, len, 28 &crc32_msb_0x04c11db7_consts); 29 return crc32_be_base(crc, p, len); 30 } 31 EXPORT_SYMBOL(crc32_be_arch); 32 33 u32 crc32c_arch(u32 crc, const u8 *p, size_t len) 34 { 35 if (riscv_has_extension_likely(RISCV_ISA_EXT_ZBC)) 36 return crc32_lsb_clmul(crc, p, len, 37 &crc32_lsb_0x82f63b78_consts); 38 return crc32c_base(crc, p, len); 39 } 40 EXPORT_SYMBOL(crc32c_arch); 41 42 u32 crc32_optimizations(void) 43 { 44 if (riscv_has_extension_likely(RISCV_ISA_EXT_ZBC)) 45 return CRC32_LE_OPTIMIZATION | 46 CRC32_BE_OPTIMIZATION | 47 CRC32C_OPTIMIZATION; 48 return 0; 49 } 50 EXPORT_SYMBOL(crc32_optimizations); 51 52 MODULE_DESCRIPTION("RISC-V optimized CRC32 functions"); 53 MODULE_LICENSE("GPL"); 54