UHCI_PTR_QH
(link & UHCI_PTR_QH) == 0;
eqh->qh.qh_hlink = htole32(sqh->physaddr | UHCI_PTR_QH);
bsqh->qh.qh_hlink = htole32(lsqh->physaddr | UHCI_PTR_QH);
chsqh->qh.qh_hlink = htole32(bsqh->physaddr | UHCI_PTR_QH);
clsqh->qh.qh_hlink = htole32(chsqh->physaddr | UHCI_PTR_QH);
std->td.td_link = htole32(sqh->physaddr | UHCI_PTR_QH);
sqh->qh.qh_hlink = htole32(clsqh->physaddr | UHCI_PTR_QH);
htole32(sc->sc_hctl_start->physaddr | UHCI_PTR_QH);
eqh->qh.qh_hlink = htole32(sqh->physaddr | UHCI_PTR_QH);
eqh->qh.qh_hlink = htole32(sqh->physaddr | UHCI_PTR_QH);
eqh->qh.qh_hlink = htole32(sqh->physaddr | UHCI_PTR_QH);