A machine-independent DMA framework for NetBSD

Authors:
Jason R. Thorpe
Affiliations:
Numerical Aerospace Simulation Facility, NASA Ames Research Center
Venue:
ATEC '98 Proceedings of the annual conference on USENIX Annual Technical Conference
Year:
1998

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Abstract

One of the challenges in implementing a portable kernel is finding good abstractions for semantically-similar operations which often have very machine-dependent implementations. This is especially important on modern machines which share common architectural features, e.g. the PCI bus. This paper describes why a machine-independent DMA mapping abstraction is needed, the design considerations for such an abstraction, and the implementation of this abstraction in the NetBSD/alpha and NetBSD/i386 kernels.