301 lines
9.0 KiB
Groff
301 lines
9.0 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 September 1, 2006
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.Dt OPENFIRM 4 sparc64
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.Os
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.Sh NAME
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.Nm openfirm
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.Nd "Open Firmware 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/openfirmio.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 an 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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.Tn SunOS /
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.Tn Solaris
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compatible
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.Xr openprom 4
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interface and highly stylized.
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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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The nodes are represented by package handles,
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which are simply integer values describing data areas.
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Occasionally a package handle of 0 may be used or returned instead,
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as described below.
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.Pp
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The calls that only take and/or return the package handle of a node
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use a pointer to a
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.Vt phandle_t
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for this purpose.
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The others use a pointer to a
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.Vt "struct ofiocdesc"
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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 ofiocdesc {
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phandle_t of_nodeid;
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int of_namelen;
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const char *of_name;
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int of_buflen;
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char *of_buf;
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};
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.Ed
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.Pp
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The
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.Va of_nodeid
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member is the package handle of the node that is passed in or returned.
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Strings are passed in via the
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.Va of_name
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member of
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.Va of_namelen
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length.
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The maximum accepted length of
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.Va of_name
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is
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.Dv OFIOCMAXNAME .
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The
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.Va of_buf
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member is used to return strings except for the
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.Dv OFIOCSET
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call where it is also used to pass in a string.
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In the latter case the maximum accepted length of
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.Va of_buf
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is
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.Dv OFIOCMAXVALUE .
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Generally,
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.Va of_buf
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works in a value-result fashion.
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At entry to the
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.Xr ioctl 2
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call,
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.Va of_buflen
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is expected to reflect the buffer size.
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On return,
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.Va of_buflen
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is updated to reflect the buffer contents.
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.Pp
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The following
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.Xr ioctl 2
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calls are supported:
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.Bl -tag -width ".Dv OFIOCGETOPTNODE"
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.It Dv OFIOCGETOPTNODE
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Uses a
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.Vt phandle_t .
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Takes nothing and returns the package handle of the
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.Pa /options
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node.
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.It Dv OFIOCGETNEXT
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Uses a
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.Vt phandle_t .
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Takes the package handle of a node and returns the package handle of the next
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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 has a package handle of 0.
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The node following the node with the package handle of 0 is the first node.
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.It Dv OFIOCGETCHILD
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Uses a
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.Vt phandle_t .
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Takes the package handle of a node and returns the package handle of the first
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child of that 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 OFIOCGETNEXT .
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If the node does not have a child,
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a package handle of 0 is returned.
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.It Dv OFIOCGET
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Uses a
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.Vt "struct ofiocdesc" .
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Takes the package handle of a node and the name of a property.
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Returns the property value and its length.
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If no such property is associated with that node,
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the length of the value is set to \-1.
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If the named property exists but has no value,
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the length of the value is set to 0.
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.It Dv OFIOCGETPROPLEN
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Uses a
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.Vt "struct ofiocdesc" .
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Takes the package handle of a node and the name of a property.
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Returns the length of the property value.
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This call is the same as
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.Dv OFIOCGET
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except that only the length of the property value is returned.
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It can be used to determine whether a node has a particular property or whether
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a property has a value without the need to provide memory for storing the value.
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.It Dv OFIOCSET
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Uses a
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.Vt "struct ofiocdesc" .
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Takes the package handle of a node,
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the name of a property and a property value.
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Returns the property value and the length that actually have been written.
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The
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.Tn Open Firmware
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may choose to truncate the value if it is too long or write a valid value
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instead if the given value is invalid for the particular property.
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Therefore the returned value should be checked.
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The
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.Tn Open Firmware
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may also completely refuse to write the given value to the property.
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In this case
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.Er EINVAL
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is returned.
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.It Dv OFIOCNEXTPROP
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Uses a
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.Vt "struct ofiocdesc" .
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Takes the package handle of a node and the name of a property.
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Returns the name and the length of the next property of the node.
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If the property referenced by the given name is the last property of the node,
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.Er ENOENT
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is returned.
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.It Dv OFIOCFINDDEVICE
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Uses a
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.Vt "struct ofiocdesc" .
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Takes the name or alias name of a device node.
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Returns package handle of the node.
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If no matching node is found,
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.Er ENOENT
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is returned.
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.El
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.Sh FILES
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.Bl -tag -width ".Pa /dev/openfirm"
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.It Pa /dev/openfirm
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Open Firmware 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 EBADF
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The requested operation requires permissions not specified at the call to
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.Fn open .
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.It Bq Er EINVAL
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The given package handle is not 0 and does not correspond to any valid node,
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or the given package handle is 0 where 0 is not allowed.
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.It Bq Er ENAMETOOLONG
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The given name or value exceeds the maximum allowed length of
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.Dv OFIOCMAXNAME
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and
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.Dv OFIOCMAXVALUE
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bytes respectively.
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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 openprom 4 ,
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.Xr eeprom 8 ,
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.Xr ofwdump 8
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.Rs
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.%Q "IEEE Standards Organization"
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.%B "IEEE Std 1275-1994:"
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.%B "IEEE Standard for Boot Firmware (Initialization Configuration) Firmware:"
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.%B Core Requirements and Practices"
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.%O ISBN 1-55937-426-8
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.Re
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.Sh HISTORY
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The
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.Nm
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interface first appeared in
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.Nx 1.6 .
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The first
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.Fx
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version to include it 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 ported to
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.Fx
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by
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.An Thomas Moestl Aq Mt tmm@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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For at least the
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.Pa /options
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node the property value passed in to the
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.Dv OFIOCSET
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call has to be null-terminated and the value length passed in has to include
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the terminating
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.Ql \e0 .
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However, as with the
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.Dv OFIOCGET
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call,
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the returned value length does not include the terminating
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.Ql \e0 .
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