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64 lines
2.4 KiB
Groff
64 lines
2.4 KiB
Groff
.\" -*- nroff -*-
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.\"
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.\" Copyright (c) 1998 Doug Rabson
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.\"
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.\" All rights reserved.
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.\"
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.\" This program is free software.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd June 16, 1998
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.Dt BUS_READ_IVAR 9
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.Os
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.Sh NAME
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.Nm BUS_READ_IVAR ,
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.Nm BUS_WRITE_IVAR
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.Nd manipulate bus-specific device instance variables
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.Sh SYNOPSIS
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.In sys/param.h
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.In sys/bus.h
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.Ft int
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.Fn BUS_READ_IVAR "device_t dev" "device_t child" "int index" "uintptr_t *result"
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.Ft int
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.Fn BUS_WRITE_IVAR "device_t dev" "device_t child" "int index" "uintptr_t value"
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.Sh DESCRIPTION
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These two methods manage a bus specific set of instance variables of
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a child device.
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The intention is that each different type of bus
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defines a set of appropriate instance variables (such as ports and
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irqs for ISA bus etc.)
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.Pp
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This information could be given to the child device as a struct but
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that makes it hard for a bus to add or remove variables without
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forcing an edit and recompile for all drivers which may not be
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possible for vendor supplied binary drivers.
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.Sh RETURN VALUES
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Zero is returned on success, otherwise an appropriate error is returned.
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.Sh SEE ALSO
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.Xr device 9 ,
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.Xr driver 9
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.Sh AUTHORS
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This manual page was written by
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.An Doug Rabson .
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