mirror of
https://github.com/raspberrypi/linux.git
synced 2025-12-19 16:24:21 +00:00
72acff5f81
Delete the previous Zbc optimized CRC32 code, and re-implement it using the new template. The new implementation is more optimized and shares more code among CRC variants. Tested-by: Björn Töpel <bjorn@rivosinc.com> Acked-by: Alexandre Ghiti <alexghiti@rivosinc.com> Link: https://lore.kernel.org/r/20250216225530.306980-3-ebiggers@kernel.org Signed-off-by: Eric Biggers <ebiggers@google.com>
54 lines
1.3 KiB
C
54 lines
1.3 KiB
C
// 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");
|