add arm64 support

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

arch/arm64/kernel/include/vdso.h

@@ -0,0 +1,30 @@
+/* vdso.h COPYRIGHT FUJITSU LIMITED 2016 */
+#ifndef __HEADER_ARM64_COMMON_VDSO_H
+#define __HEADER_ARM64_COMMON_VDSO_H
+
+#ifdef __KERNEL__
+
+/* @ref.impl arch/arm64/include/asm/vsdo.h::VDSO_LBASE */
+/*
+ * Default link address for the vDSO.
+ * Since we randomise the VDSO mapping, there's little point in trying
+ * to prelink this.
+ */
+#define VDSO_LBASE	0x0
+
+#ifndef __ASSEMBLY__
+
+#include <vdso-offsets.h>
+
+/* @ref.impl arch/arm64/include/asm/vsdo.h::VDSO_SYMBOL */
+#define VDSO_SYMBOL(base, name)		vdso_symbol_##name((unsigned long)(base))
+void* vdso_symbol_sigtramp(unsigned long base);
+
+int add_vdso_pages(struct thread *thread);
+
+#endif /* !__ASSEMBLY__ */
+
+#endif /* __KERNEL__ */
+
+#endif /* !__HEADER_ARM64_COMMON_VDSO_H */
+