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+.\" -*- nroff -*-
+.\"
+.\" Copyright (c) 1998 Doug Rabson
+.\"
+.\" All rights reserved.
+.\"
+.\" This program is free software.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 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
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR
+.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT,
+.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd June 16, 1998
+.Dt BUS_READ_IVAR 9
+.Os
+.Sh NAME
+.Nm BUS_READ_IVAR ,
+.Nm BUS_WRITE_IVAR
+.Nd manipulate bus-specific device instance variables
+.Sh SYNOPSIS
+.In sys/param.h
+.In sys/bus.h
+.Ft int
+.Fn BUS_READ_IVAR "device_t dev" "device_t child" "int index" "uintptr_t *result"
+.Ft int
+.Fn BUS_WRITE_IVAR "device_t dev" "device_t child" "int index" "uintptr_t value"
+.Sh DESCRIPTION
+These two methods manage a bus specific set of instance variables of
+a child device.
+The intention is that each different type of bus
+defines a set of appropriate instance variables (such as ports and
+irqs for ISA bus etc.)
+.Pp
+This information could be given to the child device as a struct but
+that makes it hard for a bus to add or remove variables without
+forcing an edit and recompile for all drivers which may not be
+possible for vendor supplied binary drivers.
+.Sh RETURN VALUES
+Zero is returned on success, otherwise an appropriate error is returned.
+.Sh SEE ALSO
+.Xr device 9 ,
+.Xr driver 9
+.Sh AUTHORS
+This manual page was written by
+.An Doug Rabson .