Resguardo inicial

linux-7.2.3/lib/crypto/arm64/sm3.h

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+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * SM3 optimized for ARM64
+ *
+ * Copyright 2026 Google LLC
+ */
+#include <asm/simd.h>
+#include <linux/cpufeature.h>
+
+static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_neon);
+static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_ce);
+
+asmlinkage void sm3_neon_transform(struct sm3_block_state *state,
+				   const u8 *data, size_t nblocks);
+asmlinkage void sm3_ce_transform(struct sm3_block_state *state,
+				 const u8 *data, size_t nblocks);
+
+static void sm3_blocks(struct sm3_block_state *state,
+		       const u8 *data, size_t nblocks)
+{
+	if (static_branch_likely(&have_neon) && likely(may_use_simd())) {
+		scoped_ksimd() {
+			if (static_branch_likely(&have_ce))
+				sm3_ce_transform(state, data, nblocks);
+			else
+				sm3_neon_transform(state, data, nblocks);
+		}
+	} else {
+		sm3_blocks_generic(state, data, nblocks);
+	}
+}
+
+#define sm3_mod_init_arch sm3_mod_init_arch
+static void sm3_mod_init_arch(void)
+{
+	if (cpu_have_named_feature(ASIMD)) {
+		static_branch_enable(&have_neon);
+		if (cpu_have_named_feature(SM3))
+			static_branch_enable(&have_ce);
+	}
+}