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Linux kernel mirror (for testing)
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kernel
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linux
1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * SHA-1 optimized for ARM
4 *
5 * Copyright 2025 Google LLC
6 */
7#include <asm/simd.h>
8
9static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_neon);
10static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_ce);
11
12asmlinkage void sha1_block_data_order(struct sha1_block_state *state,
13 const u8 *data, size_t nblocks);
14asmlinkage void sha1_transform_neon(struct sha1_block_state *state,
15 const u8 *data, size_t nblocks);
16asmlinkage void sha1_ce_transform(struct sha1_block_state *state,
17 const u8 *data, size_t nblocks);
18
19static void sha1_blocks(struct sha1_block_state *state,
20 const u8 *data, size_t nblocks)
21{
22 if (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) &&
23 static_branch_likely(&have_neon) && likely(may_use_simd())) {
24 scoped_ksimd() {
25 if (static_branch_likely(&have_ce))
26 sha1_ce_transform(state, data, nblocks);
27 else
28 sha1_transform_neon(state, data, nblocks);
29 }
30 } else {
31 sha1_block_data_order(state, data, nblocks);
32 }
33}
34
35#ifdef CONFIG_KERNEL_MODE_NEON
36#define sha1_mod_init_arch sha1_mod_init_arch
37static void sha1_mod_init_arch(void)
38{
39 if (elf_hwcap & HWCAP_NEON) {
40 static_branch_enable(&have_neon);
41 if (elf_hwcap2 & HWCAP2_SHA1)
42 static_branch_enable(&have_ce);
43 }
44}
45#endif /* CONFIG_KERNEL_MODE_NEON */