3 .\" Copyright (c) 1998 Jason R. Thorpe.
4 .\" All rights reserved.
6 .\" Redistribution and use in source and binary forms, with or without
7 .\" modification, are permitted provided that the following conditions
9 .\" 1. Redistributions of source code must retain the above copyright
10 .\" notice, this list of conditions and the following disclaimer.
11 .\" 2. Redistributions in binary form must reproduce the above copyright
12 .\" notice, this list of conditions and the following disclaimer in the
13 .\" documentation and/or other materials provided with the distribution.
14 .\" 3. All advertising materials mentioning features or use of this software
15 .\" must display the following acknowledgements:
16 .\" This product includes software developed for the NetBSD Project
17 .\" by Jason R. Thorpe.
18 .\" 4. The name of the author may not be used to endorse or promote products
19 .\" derived from this software without specific prior written permission.
21 .\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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27 .\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
28 .\" AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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39 A Machine-Independent DMA Framework for NetBSD
52 Numerical Aerospace Simulation Facility
54 NASA Ames Research Center
57 .\" Set up 2-column output for the remainder of the paper
66 One of the challenges in implementing a portable kernel is finding
67 good abstractions for semantically-similar operations which often have
68 very machine-dependent implementations. This is especially important
69 on modern machines which share common architectural features, e.g.
72 This paper describes why a machine-independent DMA mapping abstraction
73 is needed, the design considerations for such an abstraction, and the
74 implementation of this abstraction in the NetBSD/alpha and
76 .\" Set up 2-column output for the remainder of the paper
79 \**Jason R. Thorpe is an employee of MRJ Technology Solutions, Inc.
80 This work is funded by NASA contract NAS2-14303.