UHCI_USBCMD
outw(UHCI_USBCMD_HCRESET, base + UHCI_USBCMD);
if (inw(base + UHCI_USBCMD) & UHCI_USBCMD_HCRESET)
outw(0, base + UHCI_USBCMD);
cmd = inw(base + UHCI_USBCMD);