VCONS_IS_VISIBLE
scr->scr_status &= ~VCONS_IS_VISIBLE;
#define SCREEN_VISIBLE(scr) ((scr)->scr_status |= VCONS_IS_VISIBLE)
#define SCREEN_INVISIBLE(scr) ((scr)->scr_status &= ~VCONS_IS_VISIBLE)
#define SCREEN_IS_VISIBLE(scr) (((scr)->scr_status & VCONS_IS_VISIBLE) != 0)