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
10 static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_neon);
11 static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_ce);
12
13 asmlinkage void sha1_block_data_order(struct sha1_block_state *state,
14 const u8 *data, size_t nblocks);
15 asmlinkage void sha1_transform_neon(struct sha1_block_state *state,
16 const u8 *data, size_t nblocks);
17 asmlinkage void sha1_ce_transform(struct sha1_block_state *state,
18 const u8 *data, size_t nblocks);
19
sha1_blocks(struct sha1_block_state * state,const u8 * data,size_t nblocks)20 static 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
sha1_mod_init_arch(void)38 static 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 */
47