1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * OpenSSL/Cryptogams accelerated Poly1305 transform for arm64 4 * 5 * Copyright (C) 2019 Linaro Ltd. <ard.biesheuvel@linaro.org> 6 */ 7 8 #include <asm/hwcap.h> 9 #include <asm/neon.h> 10 #include <asm/simd.h> 11 #include <linux/cpufeature.h> 12 #include <linux/jump_label.h> 13 #include <linux/kernel.h> 14 15 asmlinkage void poly1305_block_init(struct poly1305_block_state *state, 16 const u8 raw_key[POLY1305_BLOCK_SIZE]); 17 asmlinkage void poly1305_blocks_arm64(struct poly1305_block_state *state, 18 const u8 *src, u32 len, u32 hibit); 19 asmlinkage void poly1305_blocks_neon(struct poly1305_block_state *state, 20 const u8 *src, u32 len, u32 hibit); 21 asmlinkage void poly1305_emit(const struct poly1305_state *state, 22 u8 digest[POLY1305_DIGEST_SIZE], 23 const u32 nonce[4]); 24 25 static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_neon); 26 27 static void poly1305_blocks(struct poly1305_block_state *state, const u8 *src, 28 unsigned int len, u32 padbit) 29 { 30 if (static_branch_likely(&have_neon) && likely(may_use_simd())) { 31 do { 32 unsigned int todo = min_t(unsigned int, len, SZ_4K); 33 34 kernel_neon_begin(); 35 poly1305_blocks_neon(state, src, todo, padbit); 36 kernel_neon_end(); 37 38 len -= todo; 39 src += todo; 40 } while (len); 41 } else 42 poly1305_blocks_arm64(state, src, len, padbit); 43 } 44 45 #define poly1305_mod_init_arch poly1305_mod_init_arch 46 static void poly1305_mod_init_arch(void) 47 { 48 if (cpu_have_named_feature(ASIMD)) 49 static_branch_enable(&have_neon); 50 } 51