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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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/neon.h>
8#include <asm/simd.h>
9
10static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_neon);
11static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_ce);
12
13asmlinkage void sha1_block_data_order(struct sha1_block_state *state,
14 const u8 *data, size_t nblocks);
15asmlinkage void sha1_transform_neon(struct sha1_block_state *state,
16 const u8 *data, size_t nblocks);
17asmlinkage void sha1_ce_transform(struct sha1_block_state *state,
18 const u8 *data, size_t nblocks);
19
20static void sha1_blocks(struct sha1_block_state *state,
21 const u8 *data, size_t nblocks)
22{
23 if (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) &&
24 static_branch_likely(&have_neon) && likely(may_use_simd())) {
25 kernel_neon_begin();
26 if (static_branch_likely(&have_ce))
27 sha1_ce_transform(state, data, nblocks);
28 else
29 sha1_transform_neon(state, data, nblocks);
30 kernel_neon_end();
31 } else {
32 sha1_block_data_order(state, data, nblocks);
33 }
34}
35
36#ifdef CONFIG_KERNEL_MODE_NEON
37#define sha1_mod_init_arch sha1_mod_init_arch
38static inline void sha1_mod_init_arch(void)
39{
40 if (elf_hwcap & HWCAP_NEON) {
41 static_branch_enable(&have_neon);
42 if (elf_hwcap2 & HWCAP2_SHA1)
43 static_branch_enable(&have_ce);
44 }
45}
46#endif /* CONFIG_KERNEL_MODE_NEON */