UHCI_TD_SET_MAXLEN
std->td.td_token |= htole32(UHCI_TD_SET_MAXLEN(len));
#define UHCI_TD_SETUP(len, endp, dev) (UHCI_TD_SET_MAXLEN(len) | \
#define UHCI_TD_OUT(len, endp, dev, dt) (UHCI_TD_SET_MAXLEN(len) | \
#define UHCI_TD_IN(len, endp, dev, dt) (UHCI_TD_SET_MAXLEN(len) | \