mirror of https://github.com/torvalds/linux.git
46 lines
1.2 KiB
C
46 lines
1.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* arm64-optimized SHA-512 block function
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*
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* Copyright 2025 Google LLC
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*/
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#include <asm/simd.h>
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#include <linux/cpufeature.h>
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static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_sha512_insns);
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asmlinkage void sha512_block_data_order(struct sha512_block_state *state,
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const u8 *data, size_t nblocks);
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asmlinkage size_t __sha512_ce_transform(struct sha512_block_state *state,
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const u8 *data, size_t nblocks);
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static void sha512_blocks(struct sha512_block_state *state,
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const u8 *data, size_t nblocks)
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{
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if (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) &&
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static_branch_likely(&have_sha512_insns) &&
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likely(may_use_simd())) {
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do {
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size_t rem;
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scoped_ksimd()
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rem = __sha512_ce_transform(state, data, nblocks);
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data += (nblocks - rem) * SHA512_BLOCK_SIZE;
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nblocks = rem;
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} while (nblocks);
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} else {
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sha512_block_data_order(state, data, nblocks);
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}
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}
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#ifdef CONFIG_KERNEL_MODE_NEON
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#define sha512_mod_init_arch sha512_mod_init_arch
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static void sha512_mod_init_arch(void)
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{
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if (cpu_have_named_feature(SHA512))
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static_branch_enable(&have_sha512_insns);
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}
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#endif /* CONFIG_KERNEL_MODE_NEON */
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