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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* RISC-V optimized CRC32 functions
*
* Copyright 2025 Google LLC
*/
#include <asm/hwcap.h>
#include <asm/alternative-macros.h>
#include <linux/crc32.h>
#include <linux/module.h>
#include "crc-clmul.h"
u32 crc32_le_arch(u32 crc, const u8 *p, size_t len)
{
if (riscv_has_extension_likely(RISCV_ISA_EXT_ZBC))
return crc32_lsb_clmul(crc, p, len,
&crc32_lsb_0xedb88320_consts);
return crc32_le_base(crc, p, len);
}
EXPORT_SYMBOL(crc32_le_arch);
u32 crc32_be_arch(u32 crc, const u8 *p, size_t len)
{
if (riscv_has_extension_likely(RISCV_ISA_EXT_ZBC))
return crc32_msb_clmul(crc, p, len,
&crc32_msb_0x04c11db7_consts);
return crc32_be_base(crc, p, len);
}
EXPORT_SYMBOL(crc32_be_arch);
u32 crc32c_arch(u32 crc, const u8 *p, size_t len)
{
if (riscv_has_extension_likely(RISCV_ISA_EXT_ZBC))
return crc32_lsb_clmul(crc, p, len,
&crc32_lsb_0x82f63b78_consts);
return crc32c_base(crc, p, len);
}
EXPORT_SYMBOL(crc32c_arch);
u32 crc32_optimizations(void)
{
if (riscv_has_extension_likely(RISCV_ISA_EXT_ZBC))
return CRC32_LE_OPTIMIZATION |
CRC32_BE_OPTIMIZATION |
CRC32C_OPTIMIZATION;
return 0;
}
EXPORT_SYMBOL(crc32_optimizations);
MODULE_DESCRIPTION("RISC-V optimized CRC32 functions");
MODULE_LICENSE("GPL");
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