UHCI_QH_ALIGN    1648 dev/usb/uhci.c 			  UHCI_QH_ALIGN, &dma);
UHCI_QH_ALIGN     121 dev/usb/uhcivar.h #define UHCI_SQH_SIZE ((sizeof (struct uhci_soft_qh) + UHCI_QH_ALIGN - 1) / UHCI_QH_ALIGN * UHCI_QH_ALIGN)