1 .\" $NetBSD: ibus.4,v 1.3 2003/06/26 10:12:18 wiz Exp $
3 .\" Copyright (c) 1998 MINOURA Makoto
4 .\" Copyright (c) 1998 NetBSD Foundation, Inc.
5 .\" All rights reserved.
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17 .\" This product includes software developed by Minoura Makoto.
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32 .Dd September 12, 2001
37 .Nd pmax internal I/O space driver
39 .Cd "ibus0 at mainbus0"
40 .Cd "ibus0 at tc? slot ? offset ?"
43 is a virtual device corresponding to the pmax internal I/O space found
44 on DEC 2100, 3100, 5100 and 5000/200 systems.
46 Internal I/O space spans the pmax physical address space, and is
47 mapped permanently in the kernel virtual space at the very early time
48 of the kernel startup procedure.
51 driver manages the internal I/O space of pmax.
53 .Bl -bullet -offset indent
55 Address range management to avoid confliction of address space of
56 which devices probe by touching hardware port is difficult.
58 Interrupt vector management.
65 Other utility functions.
69 is always required to run the