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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* SHA-256 optimized for ARM64
*
* Copyright 2025 Google LLC
*/
#include <asm/neon.h>
#include <crypto/internal/sha2.h>
#include <linux/kernel.h>
#include <linux/module.h>
asmlinkage void sha256_blocks_arch(u32 state[SHA256_STATE_WORDS],
const u8 *data, size_t nblocks);
EXPORT_SYMBOL_GPL(sha256_blocks_arch);
asmlinkage void sha256_block_neon(u32 state[SHA256_STATE_WORDS],
const u8 *data, size_t nblocks);
asmlinkage size_t __sha256_ce_transform(u32 state[SHA256_STATE_WORDS],
const u8 *data, size_t nblocks);
static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_neon);
static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_ce);
void sha256_blocks_simd(u32 state[SHA256_STATE_WORDS],
const u8 *data, size_t nblocks)
{
if (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) &&
static_branch_likely(&have_neon)) {
if (static_branch_likely(&have_ce)) {
do {
size_t rem;
kernel_neon_begin();
rem = __sha256_ce_transform(state,
data, nblocks);
kernel_neon_end();
data += (nblocks - rem) * SHA256_BLOCK_SIZE;
nblocks = rem;
} while (nblocks);
} else {
kernel_neon_begin();
sha256_block_neon(state, data, nblocks);
kernel_neon_end();
}
} else {
sha256_blocks_arch(state, data, nblocks);
}
}
EXPORT_SYMBOL_GPL(sha256_blocks_simd);
bool sha256_is_arch_optimized(void)
{
/* We always can use at least the ARM64 scalar implementation. */
return true;
}
EXPORT_SYMBOL_GPL(sha256_is_arch_optimized);
static int __init sha256_arm64_mod_init(void)
{
if (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) &&
cpu_have_named_feature(ASIMD)) {
static_branch_enable(&have_neon);
if (cpu_have_named_feature(SHA2))
static_branch_enable(&have_ce);
}
return 0;
}
subsys_initcall(sha256_arm64_mod_init);
static void __exit sha256_arm64_mod_exit(void)
{
}
module_exit(sha256_arm64_mod_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("SHA-256 optimized for ARM64");
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