Direct memory access using memory descriptor list

Details Direct memory access using memory descriptor list Direct memory access using memory descriptor list

2007-10-23

2007-10-23

Sparks, Donald (Department: 2181)

Electrical computers and digital data processing systems: input/

Input/output data processing

Direct memory accessing

C710S024000, C711S206000, C711S208000, C711S209000

Reexamination Certificate

active

10635306

ABSTRACT:
Machine-readable media, methods, and apparatus are described for transferring data. In some embodiments, an operating system may allocate pages to a buffer and may build a memory descriptor list that references the pages allocated to the buffer. A direct memory access (DMA) controller may process the memory descriptor list and transfer data between a buffer defined by the memory descriptor list and another location per the memory descriptor list. The DMA controller may further support data transfers that involve buffers defined by scatter gather lists and/or chained DMA descriptors built by a device driver.

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OSR Open Systems Resources, Inc., “How NT Describes I/O Requests”, 1998, 11 pages.
Microsoft Corporation, “What Is Really In That MDL?”, Jan. 24, 2006, 3 pages, available at http.//www.microsoft.com/whdc/driver/tips/mdl.mspx.
Microsoft Corporation, “DMA Support In Windows Drivers”, May 10, 2006, 39 pages, available at http://www.microsoft.com/whdc/driver/kernel/dma.mspx.

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