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Linux kernel mirror (for testing)
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linux
1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * arm32-optimized SHA-512 block function
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);
11
12asmlinkage void sha512_block_data_order(struct sha512_block_state *state,
13 const u8 *data, size_t nblocks);
14asmlinkage void sha512_block_data_order_neon(struct sha512_block_state *state,
15 const u8 *data, size_t nblocks);
16
17static void sha512_blocks(struct sha512_block_state *state,
18 const u8 *data, size_t nblocks)
19{
20 if (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) &&
21 static_branch_likely(&have_neon) && likely(may_use_simd())) {
22 kernel_neon_begin();
23 sha512_block_data_order_neon(state, data, nblocks);
24 kernel_neon_end();
25 } else {
26 sha512_block_data_order(state, data, nblocks);
27 }
28}
29
30#ifdef CONFIG_KERNEL_MODE_NEON
31#define sha512_mod_init_arch sha512_mod_init_arch
32static void sha512_mod_init_arch(void)
33{
34 if (cpu_has_neon())
35 static_branch_enable(&have_neon);
36}
37#endif /* CONFIG_KERNEL_MODE_NEON */