add arm64 support

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

arch/arm64/kernel/include/irqflags.h

@@ -0,0 +1,31 @@
+/* irqflags.h COPYRIGHT FUJITSU LIMITED 2015-2017 */
+#ifndef __HEADER_ARM64_COMMON_IRQFLAGS_H
+#define __HEADER_ARM64_COMMON_IRQFLAGS_H
+
+#include <ptrace.h>
+
+/*
+ * save and restore debug state
+ */
+static inline unsigned long local_dbg_save(void)
+{
+	unsigned long flags;
+	asm volatile(
+		"mrs    %0, daif		// local_dbg_save\n"
+		"msr    daifset, #8"
+		: "=r" (flags)
+		:
+		: "memory");
+	return flags;
+}
+
+static inline void local_dbg_restore(unsigned long flags)
+{
+	asm volatile(
+		"msr    daif, %0		// local_dbg_restore"
+		:
+		: "r" (flags)
+		: "memory");
+}
+
+#endif /* !__HEADER_ARM64_COMMON_IRQFLAGS_H */