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
crc32_le_arch(u32 crc,const u8 * p,size_t len)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
crc32_be_arch(u32 crc,const u8 * p,size_t len)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
crc32c_arch(u32 crc,const u8 * p,size_t len)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
crc32_optimizations_arch(void)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