add arm64 support

- add arm64 dependent codes with GICv3 and SVE support
- fix bugs based on architecture separation requests

arch/arm64/kernel/include/linkage.h

@@ -0,0 +1,25 @@
+/* linkage.h COPYRIGHT FUJITSU LIMITED 2015-2016 */
+#ifndef __HEADER_ARM64_COMMON_LINKAGE_H
+#define __HEADER_ARM64_COMMON_LINKAGE_H
+
+#include <arch-memory.h>
+#include <compiler.h>
+
+#define ASM_NL		;
+
+#define __ALIGN		.align 4
+#define __ALIGN_STR	".align 4"
+
+#define ENTRY(name)		\
+	.globl name ASM_NL	\
+	__ALIGN ASM_NL		\
+	name:
+
+#define END(name)		\
+	.size name, .-name
+
+#define ENDPROC(name)			\
+	.type name, @function ASM_NL	\
+	END(name)
+
+#endif /* !__HEADER_ARM64_COMMON_LINKAGE_H */