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| 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
|---|---|
| 2 | /* |
| 3 | * BLAKE2b digest algorithm, NEON accelerated |
| 4 | * |
| 5 | * Copyright 2020 Google LLC |
| 6 | */ |
| 7 | |
| 8 | #include <asm/neon.h> |
| 9 | #include <asm/simd.h> |
| 10 | |
| 11 | static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_neon); |
| 12 | |
| 13 | asmlinkage void blake2b_compress_neon(struct blake2b_ctx *ctx, |
| 14 | const u8 *data, size_t nblocks, u32 inc); |
| 15 | |
| 16 | static void blake2b_compress(struct blake2b_ctx *ctx, |
| 17 | const u8 *data, size_t nblocks, u32 inc) |
| 18 | { |
| 19 | if (!static_branch_likely(&have_neon) || !may_use_simd()) { |
| 20 | blake2b_compress_generic(ctx, data, nblocks, inc); |
| 21 | return; |
| 22 | } |
| 23 | do { |
| 24 | const size_t blocks = min_t(size_t, nblocks, |
| 25 | SZ_4K / BLAKE2B_BLOCK_SIZE); |
| 26 | |
| 27 | scoped_ksimd() |
| 28 | blake2b_compress_neon(ctx, data, blocks, inc); |
| 29 | |
| 30 | data += blocks * BLAKE2B_BLOCK_SIZE; |
| 31 | nblocks -= blocks; |
| 32 | } while (nblocks); |
| 33 | } |
| 34 | |
| 35 | #define blake2b_mod_init_arch blake2b_mod_init_arch |
| 36 | static void blake2b_mod_init_arch(void) |
| 37 | { |
| 38 | if (elf_hwcap & HWCAP_NEON) |
| 39 | static_branch_enable(&have_neon); |
| 40 | } |
| 41 |
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