mirror of
https://github.com/freebsd/freebsd-src.git
synced 2024-12-04 16:49:40 +00:00
64 lines
2.4 KiB
Groff
64 lines
2.4 KiB
Groff
.\" -*- 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 .
|