sha1.h

 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 */