1.\" $NetBSD: ibus.4,v 1.2 2002/01/15 01:52:57 wiz Exp $ 2.\" 3.\" Copyright (c) 1998 MINOURA Makoto 4.\" Copyright (c) 1998 NetBSD Foundation, Inc. 5.\" All rights reserved. 6.\" 7.\" Redistribution and use in source and binary forms, with or without 8.\" modification, are permitted provided that the following conditions 9.\" are met: 10.\" 1. Redistributions of source code must retain the above copyright 11.\" notice, this list of conditions and the following disclaimer. 12.\" 2. Redistributions in binary form must reproduce the above copyright 13.\" notice, this list of conditions and the following disclaimer in the 14.\" documentation and/or other materials provided with the distribution. 15.\" 3. All advertising materials mentioning features or use of this software 16.\" must display the following acknowledgement: 17.\" This product includes software developed by Minoura Makoto. 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 20.\" 21.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31.\" 32.Dd September 12, 2001 33.Dt IBUS 4 pmax 34.Os 35.Sh NAME 36.Nm ibus 37.Nd pmax internal I/O space driver 38.Sh SYNOPSIS 39.Cd "ibus0 at mainbus0" 40.Cd "ibus0 at tc? slot ? offset ? 41.Sh DESCRIPTION 42.Nm 43is a virtual device corresponding to the pmax internal I/O space found 44on DEC 2100, 3100, 5100 and 5000/200 systems. 45.Pp 46Internal I/O space spans the pmax physical address space, and is 47mapped permanently in the kernel virtual space at the very early time 48of the kernel startup procedure. 49.Pp 50.Nm 51driver manages the internal I/O space of pmax. 52.Pp 53.Bl -bullet -offset indent -tag 54.It 55Address range management to avoid confliction of address space of 56which devices probe by touching hardware port is difficult. 57.It 58Interrupt vector management. 59.It 60.Xr bus_space 9 61and 62.Xr bus_dma 9 63implementation. 64.It 65Other utility functions. 66.El 67.Pp 68.Nm 69is always required to run the 70.Nx 71kernel. 72.Sh SEE ALSO 73.Xr intro 4 , 74.Xr bus_dma 9 , 75.Xr bus_space 9 76