_xfld
#define ecap_mhmv(x) _xfld(x,ECAP_MHMV)
#define ecap_iro(x) (_xfld(x,ECAP_IRO) * 16)
#define cap_mamv(x) _xfld(x,CAP_MAMV)
#define cap_nfr(x) (_xfld(x,CAP_NFR) + 1)
#define cap_sllps(x) _xfld(x,CAP_SLLPS)
#define cap_fro(x) (_xfld(x,CAP_FRO) * 16)
#define cap_mgaw(x) (_xfld(x,CAP_MGAW) + 1)
#define cap_sagaw(x) _xfld(x,CAP_SAGAW)