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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* SHA-256 optimized for x86_64
*
* Copyright 2025 Google LLC
*/
#include <asm/fpu/api.h>
#include <crypto/internal/sha2.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/static_call.h>
asmlinkage void sha256_transform_ssse3(u32 state[SHA256_STATE_WORDS],
const u8 *data, size_t nblocks);
asmlinkage void sha256_transform_avx(u32 state[SHA256_STATE_WORDS],
const u8 *data, size_t nblocks);
asmlinkage void sha256_transform_rorx(u32 state[SHA256_STATE_WORDS],
const u8 *data, size_t nblocks);
asmlinkage void sha256_ni_transform(u32 state[SHA256_STATE_WORDS],
const u8 *data, size_t nblocks);
static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_sha256_x86);
DEFINE_STATIC_CALL(sha256_blocks_x86, sha256_transform_ssse3);
void sha256_blocks_simd(u32 state[SHA256_STATE_WORDS],
const u8 *data, size_t nblocks)
{
if (static_branch_likely(&have_sha256_x86)) {
kernel_fpu_begin();
static_call(sha256_blocks_x86)(state, data, nblocks);
kernel_fpu_end();
} else {
sha256_blocks_generic(state, data, nblocks);
}
}
EXPORT_SYMBOL_GPL(sha256_blocks_simd);
void sha256_blocks_arch(u32 state[SHA256_STATE_WORDS],
const u8 *data, size_t nblocks)
{
sha256_blocks_generic(state, data, nblocks);
}
EXPORT_SYMBOL_GPL(sha256_blocks_arch);
bool sha256_is_arch_optimized(void)
{
return static_key_enabled(&have_sha256_x86);
}
EXPORT_SYMBOL_GPL(sha256_is_arch_optimized);
static int __init sha256_x86_mod_init(void)
{
if (boot_cpu_has(X86_FEATURE_SHA_NI)) {
static_call_update(sha256_blocks_x86, sha256_ni_transform);
} else if (cpu_has_xfeatures(XFEATURE_MASK_SSE |
XFEATURE_MASK_YMM, NULL) &&
boot_cpu_has(X86_FEATURE_AVX)) {
if (boot_cpu_has(X86_FEATURE_AVX2) &&
boot_cpu_has(X86_FEATURE_BMI2))
static_call_update(sha256_blocks_x86,
sha256_transform_rorx);
else
static_call_update(sha256_blocks_x86,
sha256_transform_avx);
} else if (!boot_cpu_has(X86_FEATURE_SSSE3)) {
return 0;
}
static_branch_enable(&have_sha256_x86);
return 0;
}
subsys_initcall(sha256_x86_mod_init);
static void __exit sha256_x86_mod_exit(void)
{
}
module_exit(sha256_x86_mod_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("SHA-256 optimized for x86_64");
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