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 9 static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_neon); 10 static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_ce); 11 12 asmlinkage void sha1_block_data_order(struct sha1_block_state *state, 13 const u8 *data, size_t nblocks); 14 asmlinkage void sha1_transform_neon(struct sha1_block_state *state, 15 const u8 *data, size_t nblocks); 16 asmlinkage void sha1_ce_transform(struct sha1_block_state *state, 17 const u8 *data, size_t nblocks); 18 19 static 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 37 static 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 */ 46