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-rw-r--r--lib/crypto/x86/sha256.h57
1 files changed, 57 insertions, 0 deletions
diff --git a/lib/crypto/x86/sha256.h b/lib/crypto/x86/sha256.h
new file mode 100644
index 000000000000..669bc06538b6
--- /dev/null
+++ b/lib/crypto/x86/sha256.h
@@ -0,0 +1,57 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * SHA-256 optimized for x86_64
+ *
+ * Copyright 2025 Google LLC
+ */
+#include <asm/fpu/api.h>
+#include <crypto/internal/simd.h>
+#include <linux/static_call.h>
+
+DEFINE_STATIC_CALL(sha256_blocks_x86, sha256_blocks_generic);
+
+#define DEFINE_X86_SHA256_FN(c_fn, asm_fn) \
+ asmlinkage void asm_fn(struct sha256_block_state *state, \
+ const u8 *data, size_t nblocks); \
+ static void c_fn(struct sha256_block_state *state, const u8 *data, \
+ size_t nblocks) \
+ { \
+ if (likely(crypto_simd_usable())) { \
+ kernel_fpu_begin(); \
+ asm_fn(state, data, nblocks); \
+ kernel_fpu_end(); \
+ } else { \
+ sha256_blocks_generic(state, data, nblocks); \
+ } \
+ }
+
+DEFINE_X86_SHA256_FN(sha256_blocks_ssse3, sha256_transform_ssse3);
+DEFINE_X86_SHA256_FN(sha256_blocks_avx, sha256_transform_avx);
+DEFINE_X86_SHA256_FN(sha256_blocks_avx2, sha256_transform_rorx);
+DEFINE_X86_SHA256_FN(sha256_blocks_ni, sha256_ni_transform);
+
+static void sha256_blocks(struct sha256_block_state *state,
+ const u8 *data, size_t nblocks)
+{
+ static_call(sha256_blocks_x86)(state, data, nblocks);
+}
+
+#define sha256_mod_init_arch sha256_mod_init_arch
+static inline void sha256_mod_init_arch(void)
+{
+ if (boot_cpu_has(X86_FEATURE_SHA_NI)) {
+ static_call_update(sha256_blocks_x86, sha256_blocks_ni);
+ } else if (cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM,
+ NULL) &&
+ boot_cpu_has(X86_FEATURE_AVX)) {
+ if (boot_cpu_has(X86_FEATURE_AVX2) &&
+ boot_cpu_has(X86_FEATURE_BMI2))
+ static_call_update(sha256_blocks_x86,
+ sha256_blocks_avx2);
+ else
+ static_call_update(sha256_blocks_x86,
+ sha256_blocks_avx);
+ } else if (boot_cpu_has(X86_FEATURE_SSSE3)) {
+ static_call_update(sha256_blocks_x86, sha256_blocks_ssse3);
+ }
+}