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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>
47 lines
1.3 KiB
C
47 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* SHA-256 optimized for ARM
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*
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* Copyright 2025 Google LLC
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*/
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#include <asm/neon.h>
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#include <asm/simd.h>
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static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_neon);
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static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_ce);
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asmlinkage void sha256_block_data_order(struct sha256_block_state *state,
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const u8 *data, size_t nblocks);
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asmlinkage void sha256_block_data_order_neon(struct sha256_block_state *state,
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const u8 *data, size_t nblocks);
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asmlinkage void sha256_ce_transform(struct sha256_block_state *state,
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const u8 *data, size_t nblocks);
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static void sha256_blocks(struct sha256_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_neon) && likely(may_use_simd())) {
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scoped_ksimd() {
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if (static_branch_likely(&have_ce))
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sha256_ce_transform(state, data, nblocks);
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else
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sha256_block_data_order_neon(state, data, nblocks);
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}
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} else {
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sha256_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 sha256_mod_init_arch sha256_mod_init_arch
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static void sha256_mod_init_arch(void)
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{
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if (elf_hwcap & HWCAP_NEON) {
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static_branch_enable(&have_neon);
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if (elf_hwcap2 & HWCAP2_SHA2)
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static_branch_enable(&have_ce);
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}
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}
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#endif /* CONFIG_KERNEL_MODE_NEON */
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