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from: @(#)openprom.4 8.1 (Berkeley) 6/5/93
from: OpenBSD: openprom.4,v 1.9 2004/03/22 22:07:21 miod Exp
-
Copyright (c) 2005 Marius Strobl <marius@FreeBSD.org>
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THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
$FreeBSD: releng/10.2/share/man/man4/man4.sparc64/openprom.4 214808 2010-11-04 21:03:50Z uqs $
.Dd June 18, 2005 .Dt OPENPROM 4 sparc64 .Os .Sh NAME .Nm openprom .Nd "OPENPROM interface" .Sh SYNOPSIS n sys/types.h n sys/ioctl.h n dev/ofw/openpromio.h .Sh DESCRIPTION The
a /dev/openfirm device is a .Tn SunOS / .Tn Solaris compatible interface to the .Tn Open Firmware device tree. This interface is similar to the .Xr openprom 4 interface. It uses .Xr ioctl 2 calls for all operations. These calls refer to the nodes in the .Tn Open Firmware device tree. However, .Fx only implements a subset of the .Xr ioctl 2 calls .Tn SunOS / .Tn Solaris does. The nodes are represented by integer values, which are simply describing data areas. Occasionally the number 0 may be used or returned instead, as described below.
p All calls use a pointer to a .Vt "struct openpromio" descriptor, which has the following definition: d -literal struct openpromio { uint32_t oprom_size; char oprom_array[]; }; .Ed
p The .Va oprom_size member refers to the size of .Va oprom_array . The .Va oprom_array member actually works like a union. Depending on the .Xr ioctl 2 call and whether the .Vt "struct openpromio" is used to pass in or return data, .Va oprom_array either contains an integer referring to a node or a string referring to a property name or property value. The maximum size of .Va oprom_array is .Dv OPROMMAXPARAM .
p The following .Xr ioctl 2 calls are currently implemented: l -tag -width ".Dv OPROMGETPROP" t Dv OPROMNEXT Takes the number of a node and returns the number of the next node in the .Tn Open Firmware device tree. The node following the last node is number 0. The node following number 0 is the first node. t Dv OPROMCHILD Takes the number of a node and returns the number of the first child of that node. This child may have siblings. These can be determined by using .Dv OPROMNEXT . If the node does not have a child, 0 is returned. t Dv OPROMGETPROP Takes the name of a property. Returns the property value. The .Dv OPROMGETPROP call refers to the node previously returned by either the .Dv OPROMNEXT or the .Dv OPROMCHILD call, depending on which one was invoked last. If the property referenced by the given name is not associated with that node, .Er EINVAL is returned. If the named property exists but has no value, an empty string is returned. t Dv OPROMNXTPROP Takes the name of a property. Returns the name of the next property of the node. As with the .Dv OPROMGETPROP call, the .Dv OPROMNXTPROP call refers to the node previously returned by either the .Dv OPROMNEXT or the .Dv OPROMCHILD call. If the property referenced by the given name is the last property of the node, an empty string is returned. .El .Sh FILES l -tag -width ".Pa /dev/openprom" t Pa /dev/openprom OPENPROM interface node .El .Sh DIAGNOSTICS The following may result in rejection of an operation: l -tag -width Er t Bq Er EBUSY The
a /dev/openprom node is already opened. t Bq Er EINVAL The given node number is not 0 and does not correspond to any valid node, or the given node number is 0 where 0 is not allowed, or the given size value is invalid, or the given property name exceeds the maximum allowed length of .Dv OPROMMAXPARAM bytes. t Bq Er ENOMEM The kernel could not allocate memory to copy in data from user-space or to retrieve data from the .Tn Open Firmware . .El .Sh SEE ALSO .Xr ioctl 2 , .Xr openfirm 4 , .Xr eeprom 8 , .Xr ofwdump 8 .Sh HISTORY The first .Fx version to include the .Nm interface was .Fx 5.0 . .Sh AUTHORS The .Nm interface was written by .An "Jake Burkholder" Aq jake@FreeBSD.org . .Sh CAVEATS Due to limitations within .Tn Open Firmware itself, these functions run at elevated priority and may adversely affect system performance.
p The .Nm interface exists entirely for compatibility with software like X11, and only the features that are actually needed for that are implemented. The interface sucks too much to actually use, new code should use the .Xr openfirm 4 interface instead.