CP_RB_RPTR        482 drivers/gpu/drm/radeon/evergreend.h #define	CP_RB_RPTR					0x8700
CP_RB_RPTR        201 drivers/gpu/drm/radeon/r600d.h #define	CP_RB_RPTR					0x8700
CP_RB_RPTR        355 drivers/gpu/drm/radeon/rv770d.h #define	CP_RB_RPTR					0x8700
CP_RB_RPTR        312 include/video/radeon.h #define CP_RB_RPTR                             0x0710