Xhc usb driver3/12/2023 The device driver then gives control to other parts of the operating system, possibly returning the data or a pointer to the data if the operation was a read.įor other operations, the device driver returns status information such as “write completed successfully” or “device busy”.īut how does the controller inform the device driver that it has finished its operation? This is accomplished via an interrupt. Once the transfer of data is complete, the device controller informs the device driver that it has finished its operation. The controller starts the transfer of data from the device to its local buffer. The device controller, in turn, examines the contents of these registers to determine what action to take (such as “read a character from the keyboard”). To start an I/O operation, the device driver loads the appropriate registers in the device controller. Below, I appended a fragmented paragraph from Operating Systems Concepts on interrupts.
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