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DMA Services (cont)
Generic DMA Functions:
- A DMA operation may be performed to or from an object
in memory
- A DMA "handle" is an opaque data type representing
such an object
- Generic DMA functions establish bindings of handles
to objects
- Other DMA functions extract "DMA cookies" from information
embedded in a DMA handle
- A DMA cookie represents a contiguous portion of a DMA
object that is entirely addressable by the device
- On x86 based systems, a DMA cookie comprises a physical
address and a length
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