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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* SHA-1 optimized for ARM64
*
* Copyright 2025 Google LLC
*/
#include <asm/neon.h>
#include <asm/simd.h>
#include <linux/cpufeature.h>
static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_ce);
asmlinkage size_t __sha1_ce_transform(struct sha1_block_state *state,
const u8 *data, size_t nblocks);
static void sha1_blocks(struct sha1_block_state *state,
const u8 *data, size_t nblocks)
{
if (static_branch_likely(&have_ce) && likely(may_use_simd())) {
do {
size_t rem;
kernel_neon_begin();
rem = __sha1_ce_transform(state, data, nblocks);
kernel_neon_end();
data += (nblocks - rem) * SHA1_BLOCK_SIZE;
nblocks = rem;
} while (nblocks);
} else {
sha1_blocks_generic(state, data, nblocks);
}
}
#define sha1_mod_init_arch sha1_mod_init_arch
static inline void sha1_mod_init_arch(void)
{
if (cpu_have_named_feature(SHA1))
static_branch_enable(&have_ce);
}
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