System and method for passing information from one device driver to another

摘要

A system and method for passing data between a first device driver and a second device driver. Data to be provided to the second device driver is identified in the first device driver. A data exchange interface within a kernel space is invoked by the first device driver. The data exchange interface initializes a physical to Direct Memory Access (DMA) address translation table for the child device based on an identifier of a direct memory access window. The data is provided to the data exchange interface. The data exchange interface, in the kernel space, writes the data to a data structure maintained and used by the second device driver.