5.1.1.3.5 OS Driver, neither SMM nor BIOS
By examining the contents of the HcControl register, the OS driver knows that there is neither an
SMM driver nor a BIOS driver if the InterruptRouting bit is not set and the
HostControllerFunctionalState is USBRESET. The driver should then wait at least the minimum
time specified in the USB Specification for assertion of reset on the USB before it proceeds to the
setup of the Host Controller.