OP_USBINTR
return hw_read(ci, OP_USBINTR, ~0);
hw_write(ci, OP_USBINTR, 0xffffffff, 0);
[OP_USBINTR] = 0x08U,
[OP_USBINTR] = 0x08U,
intr = hw_read(ci, OP_USBINTR, ~0);
hw_write(ci, OP_USBINTR, ~0, intr | USBi_SLI);
hw_write(ci, OP_USBINTR, ~0,
hw_write(ci, OP_USBINTR, ~0, 0);