TTB_IRGN_WBWA      15 arch/arm/mm/proc-v7-2level.S #define TTB_IRGN_WBWA	((0 << 0) | (1 << 6))
TTB_IRGN_WBWA      13 arch/arm/mm/proc-v7-3level.S #define TTB_IRGN_WBWA	(1 << 8)