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-rw-r--r--lib/crypto/arm64/sha256.h57
1 files changed, 57 insertions, 0 deletions
diff --git a/lib/crypto/arm64/sha256.h b/lib/crypto/arm64/sha256.h
new file mode 100644
index 000000000000..a211966c124a
--- /dev/null
+++ b/lib/crypto/arm64/sha256.h
@@ -0,0 +1,57 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * SHA-256 optimized for ARM64
+ *
+ * Copyright 2025 Google LLC
+ */
+#include <asm/neon.h>
+#include <crypto/internal/simd.h>
+#include <linux/cpufeature.h>
+
+asmlinkage void sha256_block_data_order(struct sha256_block_state *state,
+ const u8 *data, size_t nblocks);
+asmlinkage void sha256_block_neon(struct sha256_block_state *state,
+ const u8 *data, size_t nblocks);
+asmlinkage size_t __sha256_ce_transform(struct sha256_block_state *state,
+ const u8 *data, size_t nblocks);
+
+static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_neon);
+static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_ce);
+
+static void sha256_blocks(struct sha256_block_state *state,
+ const u8 *data, size_t nblocks)
+{
+ if (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) &&
+ static_branch_likely(&have_neon) && crypto_simd_usable()) {
+ if (static_branch_likely(&have_ce)) {
+ do {
+ size_t rem;
+
+ kernel_neon_begin();
+ rem = __sha256_ce_transform(state,
+ data, nblocks);
+ kernel_neon_end();
+ data += (nblocks - rem) * SHA256_BLOCK_SIZE;
+ nblocks = rem;
+ } while (nblocks);
+ } else {
+ kernel_neon_begin();
+ sha256_block_neon(state, data, nblocks);
+ kernel_neon_end();
+ }
+ } else {
+ sha256_block_data_order(state, data, nblocks);
+ }
+}
+
+#ifdef CONFIG_KERNEL_MODE_NEON
+#define sha256_mod_init_arch sha256_mod_init_arch
+static inline void sha256_mod_init_arch(void)
+{
+ if (cpu_have_named_feature(ASIMD)) {
+ static_branch_enable(&have_neon);
+ if (cpu_have_named_feature(SHA2))
+ static_branch_enable(&have_ce);
+ }
+}
+#endif /* CONFIG_KERNEL_MODE_NEON */