NetBSD/share/man/man4/man4.hp300/intio.4

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.\" $NetBSD: intio.4,v 1.2 2002/01/15 01:36:02 wiz Exp $
.\"
.\" Copyright (c) 1998 MINOURA Makoto
.\" Copyright (c) 1998 NetBSD Foundation, Inc.
.\" All rights reserved.
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.\" This product includes software developed by Minoura Makoto.
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.Dd September 10, 2001
.Dt INTIO 4 hp300
.Os
.Sh NAME
.Nm intio
.Nd hp300 internal I/O space driver
.Sh SYNOPSIS
.Cd "intio0 at mainbus0"
.Sh DESCRIPTION
.Nm
is a virtual device corresponding to the hp300 internal I/O space.
.Pp
Internal I/O space spans the hp300 physical address space, and is
mapped permanently in the kernel virtual space at the very early time
of the kernel startup procedure.
.Pp
.Nm
driver manages the internal I/O space of hp300.
.Pp
.Bl -bullet -offset indent -tag
.It
Address range management to avoid confliction of address space of
which devices probe by touching hardware port is difficult.
.It
Interrupt vector management.
.It
.Xr bus_space 9
and
.Xr bus_dma 9
implementation.
.It
Other utility functions.
.El
.Pp
.Nm
is always required to run the
.Nx
kernel.
.Sh SEE ALSO
.Xr bus_dma 9 ,
.Xr bus_space 9