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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>
39 lines
896 B
C
39 lines
896 B
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* SHA-1 optimized for ARM64
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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_ce);
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asmlinkage size_t __sha1_ce_transform(struct sha1_block_state *state,
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const u8 *data, size_t nblocks);
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static void sha1_blocks(struct sha1_block_state *state,
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const u8 *data, size_t nblocks)
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{
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if (static_branch_likely(&have_ce) && 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 = __sha1_ce_transform(state, data, nblocks);
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data += (nblocks - rem) * SHA1_BLOCK_SIZE;
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nblocks = rem;
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} while (nblocks);
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} else {
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sha1_blocks_generic(state, data, nblocks);
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}
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}
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#define sha1_mod_init_arch sha1_mod_init_arch
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static void sha1_mod_init_arch(void)
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{
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if (cpu_have_named_feature(SHA1))
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static_branch_enable(&have_ce);
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}
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