Monthly Archives: August 2013

This post starts with a brief reference to how iterrupts are implemented on PCI platforms. There are three methods to implement interrupts on PCI platforms: 1) legacy interrupts The devices attached to PCI bus are equipped with an external interrupt … Continue reading →

To issue commands to the USB device or the xHC, the xhci driver uses two basic structures, the Command TRBs and the Command Ring. In effect, the Command Ring is a circular buffer in host memory where the Command TRBs … Continue reading →