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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* CRC64 using [V]PCLMULQDQ instructions
*
* Copyright 2025 Google LLC
*/
#include <linux/crc64.h>
#include <linux/module.h>
#include "crc-pclmul-template.h"
static DEFINE_STATIC_KEY_FALSE(have_pclmulqdq);
DECLARE_CRC_PCLMUL_FUNCS(crc64_msb, u64);
DECLARE_CRC_PCLMUL_FUNCS(crc64_lsb, u64);
u64 crc64_be_arch(u64 crc, const u8 *p, size_t len)
{
CRC_PCLMUL(crc, p, len, crc64_msb, crc64_msb_0x42f0e1eba9ea3693_consts,
have_pclmulqdq);
return crc64_be_generic(crc, p, len);
}
EXPORT_SYMBOL_GPL(crc64_be_arch);
u64 crc64_nvme_arch(u64 crc, const u8 *p, size_t len)
{
CRC_PCLMUL(crc, p, len, crc64_lsb, crc64_lsb_0x9a6c9329ac4bc9b5_consts,
have_pclmulqdq);
return crc64_nvme_generic(crc, p, len);
}
EXPORT_SYMBOL_GPL(crc64_nvme_arch);
static int __init crc64_x86_init(void)
{
if (boot_cpu_has(X86_FEATURE_PCLMULQDQ)) {
static_branch_enable(&have_pclmulqdq);
INIT_CRC_PCLMUL(crc64_msb);
INIT_CRC_PCLMUL(crc64_lsb);
}
return 0;
}
arch_initcall(crc64_x86_init);
static void __exit crc64_x86_exit(void)
{
}
module_exit(crc64_x86_exit);
MODULE_DESCRIPTION("CRC64 using [V]PCLMULQDQ instructions");
MODULE_LICENSE("GPL");
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