[PATCH 5/5] arm64: add Crypto Extensions based synchronous core AES cipher

diff --git a/arch/arm64/crypto/aes-ce-cipher.c b/arch/arm64/crypto/aes-ce-cipher.c
new file mode 100644
index 000000000000..b5a5d5d6e4b8
--- /dev/null
+++ b/arch/arm64/crypto/aes-ce-cipher.c

@@ -0,0 +1,103 @@
+/*
+ * linux/arch/arm64/crypto/aes-ce-cipher.c
+ *
+ * Copyright (C) 2013 Linaro Ltd <ard.biesheuvel@linaro.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <asm/neon.h>
+#include <crypto/aes.h>
+#include <linux/crypto.h>
+#include <linux/module.h>
+#include <linux/cpufeature.h>
+
+MODULE_DESCRIPTION("Synchronous AES cipher using ARMv8 Crypto Extensions");
+MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
+MODULE_LICENSE("GPL");
+
+static void aes_cipher_encrypt(struct crypto_tfm *tfm, u8 dst[], u8 const src[])
+{
+	struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);
+	u32 rounds = 6 + ctx->key_length / 4;

+
+	kernel_neon_begin();
+
+	__asm__("	ld1		{v0.16b}, [%[in]]		;"
+		"	ld1		{v1.16b}, [%[key]], #16		;"
+		"0:	aese		v0.16b, v1.16b			;"
+		"	subs		%[rounds], %[rounds], #1	;"
+		"	ld1		{v1.16b}, [%[key]], #16		;"
+		"	beq		1f				;"
+		"	aesmc		v0.16b, v0.16b			;"
+		"	b		0b				;"
+		"1:	eor		v0.16b, v0.16b, v1.16b		;"
+		"	st1		{v0.16b}, [%[out]]		;"
+	: :
+		[out]		"r"(dst),
+		[in]		"r"(src),
+		[rounds]	"r"(rounds),
+		[key]		"r"(ctx->key_enc)
+	:			"cc");

+	kernel_neon_end();
+}
+
+static void aes_cipher_decrypt(struct crypto_tfm *tfm, u8 dst[], u8 const src[])
+{
+	struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);
+	u32 rounds = 6 + ctx->key_length / 4;
+
+	kernel_neon_begin();
+
+	__asm__("	ld1		{v0.16b}, [%[in]]		;"
+		"	ld1		{v1.16b}, [%[key]], #16		;"
+		"0:	aesd		v0.16b, v1.16b			;"
+		"	ld1		{v1.16b}, [%[key]], #16		;"
+		"	subs		%[rounds], %[rounds], #1	;"
+		"	beq		1f				;"
+		"	aesimc		v0.16b, v0.16b			;"
+		"	b		0b				;"
+		"1:	eor		v0.16b, v0.16b, v1.16b		;"
+		"	st1		{v0.16b}, [%[out]]		;"
+	: :
+		[out]		"r"(dst),
+		[in]		"r"(src),
+		[rounds]	"r"(rounds),
+		[key]		"r"(ctx->key_dec)
+	:			"cc");