1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * OpenSSL/Cryptogams accelerated Poly1305 transform for ARM 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_arm(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 (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) && 31 static_branch_likely(&have_neon) && likely(may_use_simd())) { 32 do { 33 unsigned int todo = min_t(unsigned int, len, SZ_4K); 34 35 kernel_neon_begin(); 36 poly1305_blocks_neon(state, src, todo, padbit); 37 kernel_neon_end(); 38 39 len -= todo; 40 src += todo; 41 } while (len); 42 } else 43 poly1305_blocks_arm(state, src, len, padbit); 44 } 45 46 #ifdef CONFIG_KERNEL_MODE_NEON 47 #define poly1305_mod_init_arch poly1305_mod_init_arch 48 static void poly1305_mod_init_arch(void) 49 { 50 if (elf_hwcap & HWCAP_NEON) 51 static_branch_enable(&have_neon); 52 } 53 #endif /* CONFIG_KERNEL_MODE_NEON */ 54