/* SPDX-License-Identifier: GPL-2.0-or-later */ /* * SHA-1 optimized for ARM64 * * Copyright 2025 Google LLC */ #include <asm/neon.h> #include <asm/simd.h> #include <linux/cpufeature.h> static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_ce); asmlinkage size_t __sha1_ce_transform(struct sha1_block_state *state, const u8 *data, size_t nblocks); static void sha1_blocks(struct sha1_block_state *state, const u8 *data, size_t nblocks) { if (static_branch_likely(&have_ce) && likely(may_use_simd())) { do { size_t rem; kernel_neon_begin(); rem = __sha1_ce_transform(state, data, nblocks); kernel_neon_end(); data += (nblocks - rem) * SHA1_BLOCK_SIZE; nblocks = rem; } while (nblocks); } else { sha1_blocks_generic(state, data, nblocks); } } #define sha1_mod_init_arch sha1_mod_init_arch static void sha1_mod_init_arch(void) { if (cpu_have_named_feature(SHA1)) static_branch_enable(&have_ce); }