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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * SHA-256 optimized for x86_64
4 *
5 * Copyright 2025 Google LLC
6 */
7#include <asm/fpu/api.h>
8#include <crypto/internal/simd.h>
9#include <linux/static_call.h>
10
11DEFINE_STATIC_CALL(sha256_blocks_x86, sha256_blocks_generic);
12
13#define DEFINE_X86_SHA256_FN(c_fn, asm_fn) \
14 asmlinkage void asm_fn(struct sha256_block_state *state, \
15 const u8 *data, size_t nblocks); \
16 static void c_fn(struct sha256_block_state *state, const u8 *data, \
17 size_t nblocks) \
18 { \
19 if (likely(crypto_simd_usable())) { \
20 kernel_fpu_begin(); \
21 asm_fn(state, data, nblocks); \
22 kernel_fpu_end(); \
23 } else { \
24 sha256_blocks_generic(state, data, nblocks); \
25 } \
26 }
27
28DEFINE_X86_SHA256_FN(sha256_blocks_ssse3, sha256_transform_ssse3);
29DEFINE_X86_SHA256_FN(sha256_blocks_avx, sha256_transform_avx);
30DEFINE_X86_SHA256_FN(sha256_blocks_avx2, sha256_transform_rorx);
31DEFINE_X86_SHA256_FN(sha256_blocks_ni, sha256_ni_transform);
32
33static void sha256_blocks(struct sha256_block_state *state,
34 const u8 *data, size_t nblocks)
35{
36 static_call(sha256_blocks_x86)(state, data, nblocks);
37}
38
39#define sha256_mod_init_arch sha256_mod_init_arch
40static inline void sha256_mod_init_arch(void)
41{
42 if (boot_cpu_has(X86_FEATURE_SHA_NI)) {
43 static_call_update(sha256_blocks_x86, sha256_blocks_ni);
44 } else if (cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM,
45 NULL) &&
46 boot_cpu_has(X86_FEATURE_AVX)) {
47 if (boot_cpu_has(X86_FEATURE_AVX2) &&
48 boot_cpu_has(X86_FEATURE_BMI2))
49 static_call_update(sha256_blocks_x86,
50 sha256_blocks_avx2);
51 else
52 static_call_update(sha256_blocks_x86,
53 sha256_blocks_avx);
54 } else if (boot_cpu_has(X86_FEATURE_SSSE3)) {
55 static_call_update(sha256_blocks_x86, sha256_blocks_ssse3);
56 }
57}