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6e07c5e166
Fix poly1305-armv4.pl to not do '.globl poly1305_blocks_neon' when poly1305_blocks_neon() is not defined. Then, remove the empty __weak definition of poly1305_blocks_neon(), which was still needed only because of that unnecessary globl statement. (It also used to be needed because the compiler could generate calls to it when CONFIG_KERNEL_MODE_NEON=n, but that has been fixed.) Thanks to Arnd Bergmann for reporting that the globl statement in the asm file was still depending on the weak symbol. Acked-by: Ard Biesheuvel <ardb@kernel.org> Link: https://lore.kernel.org/r/20250711212822.6372-1-ebiggers@kernel.org Signed-off-by: Eric Biggers <ebiggers@kernel.org>
76 lines
2.1 KiB
C
76 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* OpenSSL/Cryptogams accelerated Poly1305 transform for ARM
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*
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* Copyright (C) 2019 Linaro Ltd. <ard.biesheuvel@linaro.org>
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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/poly1305.h>
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#include <linux/cpufeature.h>
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#include <linux/jump_label.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/unaligned.h>
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asmlinkage void poly1305_block_init_arch(
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struct poly1305_block_state *state,
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const u8 raw_key[POLY1305_BLOCK_SIZE]);
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EXPORT_SYMBOL_GPL(poly1305_block_init_arch);
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asmlinkage void poly1305_blocks_arm(struct poly1305_block_state *state,
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const u8 *src, u32 len, u32 hibit);
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asmlinkage void poly1305_blocks_neon(struct poly1305_block_state *state,
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const u8 *src, u32 len, u32 hibit);
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asmlinkage void poly1305_emit_arch(const struct poly1305_state *state,
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u8 digest[POLY1305_DIGEST_SIZE],
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const u32 nonce[4]);
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EXPORT_SYMBOL_GPL(poly1305_emit_arch);
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static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_neon);
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void poly1305_blocks_arch(struct poly1305_block_state *state, const u8 *src,
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unsigned int len, u32 padbit)
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{
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len = round_down(len, POLY1305_BLOCK_SIZE);
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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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do {
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unsigned int todo = min_t(unsigned int, len, SZ_4K);
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kernel_neon_begin();
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poly1305_blocks_neon(state, src, todo, padbit);
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kernel_neon_end();
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len -= todo;
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src += todo;
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} while (len);
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} else
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poly1305_blocks_arm(state, src, len, padbit);
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}
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EXPORT_SYMBOL_GPL(poly1305_blocks_arch);
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bool poly1305_is_arch_optimized(void)
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{
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/* We always can use at least the ARM scalar implementation. */
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return true;
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}
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EXPORT_SYMBOL(poly1305_is_arch_optimized);
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static int __init arm_poly1305_mod_init(void)
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{
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if (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) &&
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(elf_hwcap & HWCAP_NEON))
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static_branch_enable(&have_neon);
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return 0;
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}
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subsys_initcall(arm_poly1305_mod_init);
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static void __exit arm_poly1305_mod_exit(void)
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{
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}
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module_exit(arm_poly1305_mod_exit);
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MODULE_DESCRIPTION("Accelerated Poly1305 transform for ARM");
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MODULE_LICENSE("GPL v2");
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