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 
crc32_le_arch(u32 crc,const u8 * p,size_t len)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 
crc32_be_arch(u32 crc,const u8 * p,size_t len)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 
crc32c_arch(u32 crc,const u8 * p,size_t len)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 
crc32_optimizations(void)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