METHOD TO RECORD BUS DATA IN A GRAPHICS SUBSYSTEM THAT USES DMA TRANSFERS

摘要

In a graphics based subsystem based on direct memory access transfer, a user queue library is used by the application program interface to send graphic command data to the graphics adapter. The user queue library transfers data stored within the user queue to the graphics adapter using direct memory access transfers. The user queue library determines whether the data should be saved. The application program interface calls a user queue routine from a user queue library. The user queue routine saves the control data to a trace file in memory. The user queue routine then transfers the graphics command data to the graphics adapter using a direct memory access transfer.