NetBSD/share/doc/papers/bus_dma/title.me

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.\" $NetBSD: title.me,v 1.1 1998/07/15 00:34:55 thorpej Exp $
.\"
.\" Copyright (c) 1998 Jason R. Thorpe.
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
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.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
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.\" 3. All advertising materials mentioning features or use of this software
.\" must display the following acknowledgements:
.\" This product includes software developed for the NetBSD Project
.\" by Jason R. Thorpe.
.\" 4. The name of the author may not be used to endorse or promote products
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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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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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