xhci_slot_context_t
xhci_slot_context_t sctx;
xd->xd_slotin = (xhci_slot_context_t *)(xd->xd_ictx.xdb_va + incr);
xd->xd_slotout = (xhci_slot_context_t *)xd->xd_octx.xdb_va;
xhci_slot_context_t *xd_slotin;
xhci_slot_context_t *xd_slotout;