cam_periph_mapmem
int cam_periph_mapmem(union ccb *ccb,
error = cam_periph_mapmem(inccb, &mapinfo);
error = cam_periph_mapmem(ccb, &mapinfo);
error = cam_periph_mapmem(ccb, &mapinfo);
error = cam_periph_mapmem(ccb, mapinfo);