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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>
43 lines
1.2 KiB
C
43 lines
1.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* SHA-256 accelerated using the sparc64 sha256 opcodes
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*
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* Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com>
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* Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
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* Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
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* SHA224 Support Copyright 2007 Intel Corporation <jonathan.lynch@intel.com>
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*/
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#include <asm/elf.h>
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#include <asm/opcodes.h>
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#include <asm/pstate.h>
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static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_sha256_opcodes);
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asmlinkage void sha256_sparc64_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 (static_branch_likely(&have_sha256_opcodes))
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sha256_sparc64_transform(state, data, nblocks);
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else
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sha256_blocks_generic(state, data, nblocks);
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}
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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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unsigned long cfr;
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if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
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return;
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__asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
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if (!(cfr & CFR_SHA256))
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return;
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static_branch_enable(&have_sha256_opcodes);
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pr_info("Using sparc64 sha256 opcode optimized SHA-256/SHA-224 implementation\n");
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}
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