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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 MIT
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/*
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* Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
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*
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* Based on public domain code from Daniel J. Bernstein and Peter Schwabe. This
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* began from SUPERCOP's curve25519/neon2/scalarmult.s, but has subsequently been
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* manually reworked for use in kernel space.
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*/
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#include <asm/hwcap.h>
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#include <asm/neon.h>
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#include <asm/simd.h>
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#include <crypto/internal/simd.h>
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#include <linux/types.h>
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#include <linux/jump_label.h>
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asmlinkage void curve25519_neon(u8 mypublic[CURVE25519_KEY_SIZE],
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const u8 secret[CURVE25519_KEY_SIZE],
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const u8 basepoint[CURVE25519_KEY_SIZE]);
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static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_neon);
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static void curve25519_arch(u8 out[CURVE25519_KEY_SIZE],
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const u8 scalar[CURVE25519_KEY_SIZE],
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const u8 point[CURVE25519_KEY_SIZE])
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{
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if (static_branch_likely(&have_neon) && crypto_simd_usable()) {
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scoped_ksimd()
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curve25519_neon(out, scalar, point);
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} else {
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curve25519_generic(out, scalar, point);
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}
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}
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static void curve25519_base_arch(u8 pub[CURVE25519_KEY_SIZE],
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const u8 secret[CURVE25519_KEY_SIZE])
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{
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curve25519_arch(pub, secret, curve25519_base_point);
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}
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#define curve25519_mod_init_arch curve25519_mod_init_arch
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static void curve25519_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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}
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