.\"	$NetBSD: title.me,v 1.1 1998/07/15 00:34:55 thorpej Exp $
.\"
.\" Copyright (c) 1998 Jason R. Thorpe.
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A Machine-Independent DMA Framework for NetBSD
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Jason R. Thorpe\**
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Numerical Aerospace Simulation Facility
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NASA Ames Research Center
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.b Abstract
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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.
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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.
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\**Jason R. Thorpe is an employee of MRJ Technology Solutions, Inc.
This work is funded by NASA contract NAS2-14303.
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