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e96cb9507f
Consolidate the CPU-based SHA-256 code into a single module, following what I did with SHA-512: - Each arch now provides a header file lib/crypto/$(SRCARCH)/sha256.h, replacing lib/crypto/$(SRCARCH)/sha256.c. The header defines sha256_blocks() and optionally sha256_mod_init_arch(). It is included by lib/crypto/sha256.c, and thus the code gets built into the single libsha256 module, with proper inlining and dead code elimination. - sha256_blocks_generic() is moved from lib/crypto/sha256-generic.c into lib/crypto/sha256.c. It's now a static function marked with __maybe_unused, so the compiler automatically eliminates it in any cases where it's not used. - Whether arch-optimized SHA-256 is buildable is now controlled centrally by lib/crypto/Kconfig instead of by lib/crypto/$(SRCARCH)/Kconfig. The conditions for enabling it remain the same as before, and it remains enabled by default. - Any additional arch-specific translation units for the optimized SHA-256 code (such as assembly files) are now compiled by lib/crypto/Makefile instead of lib/crypto/$(SRCARCH)/Makefile. Acked-by: Ard Biesheuvel <ardb@kernel.org> Link: https://lore.kernel.org/r/20250630160645.3198-13-ebiggers@kernel.org Signed-off-by: Eric Biggers <ebiggers@kernel.org>
46 lines
1.4 KiB
C
46 lines
1.4 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 <crypto/internal/simd.h>
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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 __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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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) && crypto_simd_usable()) {
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kernel_neon_begin();
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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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kernel_neon_end();
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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 inline 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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