cmi_hdl_getmcdata
rv = mcops->cmi_mc_patounum(cmi_hdl_getmcdata(hdl), pa, valid_hi,
rv = mcops->cmi_mc_unumtopa(cmi_hdl_getmcdata(hdl), up, nvl, pap);
extern void *cmi_hdl_getmcdata(cmi_hdl_t);