ccb_sim_ptr
gdt = cam_sim_softc((struct cam_sim *)ccb->ccb_h.ccb_sim_ptr);
ccb->ccb_h.ccb_sim_ptr = sim;
sim = (struct cam_sim *)ccb->ccb_h.ccb_sim_ptr;
sim = (struct cam_sim *)ccb->ccb_h.ccb_sim_ptr;
sim = (struct cam_sim *)ccb->ccb_h.ccb_sim_ptr;