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f53d18a4e6
Before modifying the prototypes of kernel_neon_begin() and kernel_neon_end() to accommodate kernel mode FP/SIMD state buffers allocated on the stack, move arm64 to the new 'ksimd' scoped guard API, which encapsulates the calls to those functions. For symmetry, do the same for 32-bit ARM too. Reviewed-by: Eric Biggers <ebiggers@kernel.org> Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
49 lines
1.4 KiB
C
49 lines
1.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* OpenSSL/Cryptogams accelerated Poly1305 transform for arm64
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*
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* Copyright (C) 2019 Linaro Ltd. <ard.biesheuvel@linaro.org>
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*/
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#include <asm/hwcap.h>
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#include <asm/simd.h>
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#include <linux/cpufeature.h>
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#include <linux/jump_label.h>
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#include <linux/kernel.h>
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asmlinkage void poly1305_block_init(struct poly1305_block_state *state,
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const u8 raw_key[POLY1305_BLOCK_SIZE]);
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asmlinkage void poly1305_blocks_arm64(struct poly1305_block_state *state,
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const u8 *src, u32 len, u32 hibit);
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asmlinkage void poly1305_blocks_neon(struct poly1305_block_state *state,
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const u8 *src, u32 len, u32 hibit);
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asmlinkage void poly1305_emit(const struct poly1305_state *state,
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u8 digest[POLY1305_DIGEST_SIZE],
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const u32 nonce[4]);
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static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_neon);
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static void poly1305_blocks(struct poly1305_block_state *state, const u8 *src,
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unsigned int len, u32 padbit)
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{
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if (static_branch_likely(&have_neon) && likely(may_use_simd())) {
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do {
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unsigned int todo = min_t(unsigned int, len, SZ_4K);
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scoped_ksimd()
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poly1305_blocks_neon(state, src, todo, padbit);
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len -= todo;
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src += todo;
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} while (len);
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} else
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poly1305_blocks_arm64(state, src, len, padbit);
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}
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#define poly1305_mod_init_arch poly1305_mod_init_arch
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static void poly1305_mod_init_arch(void)
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{
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if (cpu_have_named_feature(ASIMD))
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static_branch_enable(&have_neon);
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}
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