241 lines
7.1 KiB
Groff
241 lines
7.1 KiB
Groff
.\"-
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.\" Copyright (c) 1992, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" This software was developed by the Computer Systems Engineering group
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.\" at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
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.\" contributed to Berkeley.
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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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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" from: @(#)openprom.4 8.1 (Berkeley) 6/5/93
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.\" from: OpenBSD: openprom.4,v 1.9 2004/03/22 22:07:21 miod Exp
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.\"
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.\"-
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.\" Copyright (c) 2005 Marius Strobl <marius@FreeBSD.org>
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.\" All rights reserved.
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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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.\"
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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 AUTHOR ``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 AUTHOR 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 18, 2005
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.Dt OPENPROM 4 sparc64
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.Os
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.Sh NAME
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.Nm openprom
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.Nd "OPENPROM interface"
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.Sh SYNOPSIS
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.In sys/types.h
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.In sys/ioctl.h
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.In dev/ofw/openpromio.h
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.Sh DESCRIPTION
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The
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.Pa /dev/openfirm
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device is a
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.Tn SunOS /
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.Tn Solaris
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compatible interface to the
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.Tn Open Firmware
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device tree.
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This interface is similar to the
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.Xr openprom 4
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interface.
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It uses
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.Xr ioctl 2
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calls for all operations.
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These calls refer to the nodes in the
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.Tn Open Firmware
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device tree.
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However,
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.Fx
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only implements a subset of the
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.Xr ioctl 2
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calls
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.Tn SunOS /
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.Tn Solaris
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does.
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The nodes are represented by integer values,
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which are simply describing data areas.
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Occasionally the number 0 may be used or returned instead,
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as described below.
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.Pp
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All calls use a pointer to a
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.Vt "struct openpromio"
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descriptor,
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which has the following definition:
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.Bd -literal
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struct openpromio {
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uint32_t oprom_size;
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char oprom_array[];
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};
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.Ed
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.Pp
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The
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.Va oprom_size
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member refers to the size of
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.Va oprom_array .
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The
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.Va oprom_array
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member actually works like a union.
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Depending on the
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.Xr ioctl 2
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call and whether the
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.Vt "struct openpromio"
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is used to pass in or return data,
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.Va oprom_array
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either contains an integer referring to a node or a string referring to a
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property name or property value.
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The maximum size of
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.Va oprom_array
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is
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.Dv OPROMMAXPARAM .
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.Pp
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The following
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.Xr ioctl 2
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calls are currently implemented:
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.Bl -tag -width ".Dv OPROMGETPROP"
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.It Dv OPROMNEXT
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Takes the number of a node and returns the number of the next node in the
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.Tn Open Firmware
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device tree.
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The node following the last node is number 0.
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The node following number 0 is the first node.
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.It Dv OPROMCHILD
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Takes the number of a node and returns the number of the first child of that
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node.
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This child may have siblings.
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These can be determined by using
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.Dv OPROMNEXT .
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If the node does not have a child,
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0 is returned.
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.It Dv OPROMGETPROP
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Takes the name of a property.
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Returns the property value.
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The
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.Dv OPROMGETPROP
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call refers to the node previously returned by either the
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.Dv OPROMNEXT
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or the
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.Dv OPROMCHILD
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call,
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depending on which one was invoked last.
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If the property referenced by the given name is not associated with that node,
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.Er EINVAL
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is returned.
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If the named property exists but has no value,
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an empty string is returned.
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.It Dv OPROMNXTPROP
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Takes the name of a property.
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Returns the name of the next property of the node.
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As with the
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.Dv OPROMGETPROP
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call,
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the
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.Dv OPROMNXTPROP
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call refers to the node previously returned by either the
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.Dv OPROMNEXT
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or the
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.Dv OPROMCHILD
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call.
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If the property referenced by the given name is the last property of the node,
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an empty string is returned.
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.El
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.Sh FILES
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.Bl -tag -width ".Pa /dev/openprom"
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.It Pa /dev/openprom
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OPENPROM interface node
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.El
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.Sh DIAGNOSTICS
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The following may result in rejection of an operation:
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.Bl -tag -width Er
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.It Bq Er EBUSY
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The
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.Pa /dev/openprom
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node is already opened.
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.It Bq Er EINVAL
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The given node number is not 0 and does not correspond to any valid node,
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or the given node number is 0 where 0 is not allowed,
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or the given size value is invalid,
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or the given property name exceeds the maximum allowed length of
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.Dv OPROMMAXPARAM
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bytes.
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.It Bq Er ENOMEM
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The kernel could not allocate memory to copy in data from user-space or to
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retrieve data from the
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.Tn Open Firmware .
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.El
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.Sh SEE ALSO
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.Xr ioctl 2 ,
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.Xr openfirm 4 ,
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.Xr eeprom 8 ,
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.Xr ofwdump 8
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.Sh HISTORY
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The first
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.Fx
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version to include the
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.Nm
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interface was
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.Fx 5.0 .
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.Sh AUTHORS
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The
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.Nm
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interface was written by
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.An Jake Burkholder Aq Mt jake@FreeBSD.org .
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.Sh CAVEATS
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Due to limitations within
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.Tn Open Firmware
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itself,
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these functions run at elevated priority and may adversely affect system
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performance.
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.Pp
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The
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.Nm
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interface exists entirely for compatibility with software like X11,
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and only the features that are actually needed for that are implemented.
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The interface sucks too much to actually use,
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new code should use the
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.Xr openfirm 4
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interface instead.
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