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Review request for Default. Repository: gem5 Description ------- Changeset 10921:ccef953bfcce --------------------------- dev: Add a simple DMA engine that can be used by devices Add a simple DMA engine that sits behind a FIFO. This engine can be used by devices that need to read large amounts of data (e.g., display controllers). Most aspects of the controller, such as FIFO size, maximum number of in-flight accesses, and maximum request sizes can be configured. The DMA copies blocks of data into its FIFO. Transfers are initiated with a call to startFill() command that takes a start address and a size. Advanced users can create a derived class that overrides the onEndOfBlock() callback that is triggered when the last request to a block has been issued. At this point, the DMA engine is ready to start fetching a new block of data, potentially from a different address range. The DMA engine stops issuing new requests while it is draining. Care must be taken to ensure that devices that are fed by a DMA engine are suspended while the system is draining to avoid buffer underruns. Diffs ----- src/dev/dma_device.hh 5c76426fd9ee src/dev/dma_device.cc 5c76426fd9ee Diff: http://reviews.gem5.org/r/2942/diff/ Testing ------- Tested extensively with a new version of the HDLCD display controller model (to appear in a separate patch). Thanks, Andreas Sandberg _______________________________________________ gem5-dev mailing list [email protected] http://m5sim.org/mailman/listinfo/gem5-dev
