[PATCH RTEMS 2/7] libfreebsd: Import OFW files from FreeBSD.

G S Niteesh Babu niteesh.gs at gmail.com
Wed Jul 15 06:31:52 UTC 2020


freebsd head: b8c57b4

The following files have been imported from FreeBSD to implement
OF_* functions into RTEMS.
1) openfirm.h
2) openfirm.c
3) ofw_fdt.c
---
 cpukit/include/dev/ofw/openfirm.h            | 187 ++++
 cpukit/libfreebsd/freebsd/dev/ofw/ofw_fdt.c  | 479 +++++++++++
 cpukit/libfreebsd/freebsd/dev/ofw/openfirm.c | 848 +++++++++++++++++++
 3 files changed, 1514 insertions(+)
 create mode 100644 cpukit/include/dev/ofw/openfirm.h
 create mode 100644 cpukit/libfreebsd/freebsd/dev/ofw/ofw_fdt.c
 create mode 100644 cpukit/libfreebsd/freebsd/dev/ofw/openfirm.c

diff --git a/cpukit/include/dev/ofw/openfirm.h b/cpukit/include/dev/ofw/openfirm.h
new file mode 100644
index 0000000000..74a7075367
--- /dev/null
+++ b/cpukit/include/dev/ofw/openfirm.h
@@ -0,0 +1,187 @@
+/*	$NetBSD: openfirm.h,v 1.1 1998/05/15 10:16:00 tsubai Exp $	*/
+
+/*-
+ * SPDX-License-Identifier: (BSD-4-Clause AND BSD-2-Clause-FreeBSD)
+ *
+ * Copyright (C) 1995, 1996 Wolfgang Solfrank.
+ * Copyright (C) 1995, 1996 TooLs GmbH.
+ * All rights reserved.
+ *
+ * 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.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by TooLs GmbH.
+ * 4. The name of TooLs GmbH may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``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 TOOLS GMBH 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.
+ */
+/*
+ * Copyright (C) 2000 Benno Rice.
+ * All rights reserved.
+ *
+ * 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 Benno Rice ``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 TOOLS GMBH 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.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef _DEV_OPENFIRM_H_
+#define _DEV_OPENFIRM_H_
+
+#include <sys/types.h>
+#include <machine/_bus.h>
+
+/*
+ * Prototypes for Open Firmware Interface Routines
+ */
+
+typedef uint32_t	ihandle_t;
+typedef uint32_t	phandle_t;
+typedef uint32_t	pcell_t;
+
+#ifdef _KERNEL
+#include <sys/malloc.h>
+
+#include <machine/ofw_machdep.h>
+
+MALLOC_DECLARE(M_OFWPROP);
+
+/*
+ * Open Firmware interface initialization.  OF_install installs the named
+ * interface as the Open Firmware access mechanism, OF_init initializes it.
+ */
+
+boolean_t	OF_install(char *name, int prio);
+int		OF_init(void *cookie);
+
+/*
+ * Known Open Firmware interface names
+ */
+
+#define	OFW_STD_DIRECT	"ofw_std"	/* Standard OF interface */
+#define	OFW_STD_REAL	"ofw_real"	/* Real-mode OF interface */
+#define	OFW_STD_32BIT	"ofw_32bit"	/* 32-bit OF interface */
+#define	OFW_FDT		"ofw_fdt"	/* Flattened Device Tree */
+
+/* Generic functions */
+int		OF_test(const char *name);
+void		OF_printf(const char *fmt, ...);
+
+/* Device tree functions */
+phandle_t	OF_peer(phandle_t node);
+phandle_t	OF_child(phandle_t node);
+phandle_t	OF_parent(phandle_t node);
+ssize_t		OF_getproplen(phandle_t node, const char *propname);
+ssize_t		OF_getprop(phandle_t node, const char *propname, void *buf,
+		    size_t len);
+ssize_t		OF_getencprop(phandle_t node, const char *prop, pcell_t *buf,
+		    size_t len); /* Same as getprop, but maintains endianness */
+int		OF_hasprop(phandle_t node, const char *propname);
+ssize_t		OF_searchprop(phandle_t node, const char *propname, void *buf,
+		    size_t len);
+ssize_t		OF_searchencprop(phandle_t node, const char *propname,
+		    pcell_t *buf, size_t len);
+ssize_t		OF_getprop_alloc(phandle_t node, const char *propname,
+		    void **buf);
+ssize_t		OF_getprop_alloc_multi(phandle_t node, const char *propname,
+		    int elsz, void **buf);
+ssize_t		OF_getencprop_alloc(phandle_t node, const char *propname,
+		    void **buf);
+ssize_t		OF_getencprop_alloc_multi(phandle_t node, const char *propname,
+		    int elsz, void **buf);
+void		OF_prop_free(void *buf);
+int		OF_nextprop(phandle_t node, const char *propname, char *buf,
+		    size_t len);
+int		OF_setprop(phandle_t node, const char *name, const void *buf,
+		    size_t len);
+ssize_t		OF_canon(const char *path, char *buf, size_t len);
+phandle_t	OF_finddevice(const char *path);
+ssize_t		OF_package_to_path(phandle_t node, char *buf, size_t len);
+
+/*
+ * Some OF implementations (IBM, FDT) have a concept of effective phandles
+ * used for device-tree cross-references. Given one of these, returns the
+ * real phandle. If one can't be found (or running on OF implementations
+ * without this property), returns its input.
+ */
+phandle_t	OF_node_from_xref(phandle_t xref);
+phandle_t	OF_xref_from_node(phandle_t node);
+
+/*
+ * When properties contain references to other nodes using xref handles it is
+ * often necessary to use interfaces provided by the driver for the referenced
+ * instance.  These routines allow a driver that provides such an interface to
+ * register its association with an xref handle, and for other drivers to obtain
+ * the device_t associated with an xref handle.
+ */
+device_t	OF_device_from_xref(phandle_t xref);
+phandle_t	OF_xref_from_device(device_t dev);
+int		OF_device_register_xref(phandle_t xref, device_t dev);
+
+/* Device I/O functions */
+ihandle_t	OF_open(const char *path);
+void		OF_close(ihandle_t instance);
+ssize_t		OF_read(ihandle_t instance, void *buf, size_t len);
+ssize_t		OF_write(ihandle_t instance, const void *buf, size_t len);
+int		OF_seek(ihandle_t instance, uint64_t where);
+
+phandle_t	OF_instance_to_package(ihandle_t instance);
+ssize_t		OF_instance_to_path(ihandle_t instance, char *buf, size_t len);
+int		OF_call_method(const char *method, ihandle_t instance,
+		    int nargs, int nreturns, ...);
+
+/* Memory functions */
+void		*OF_claim(void *virtrequest, size_t size, u_int align);
+void		OF_release(void *virt, size_t size);
+
+/* Control transfer functions */
+void		OF_enter(void);
+void		OF_exit(void) __attribute__((noreturn));
+
+/* User interface functions */
+int		OF_interpret(const char *cmd, int nreturns, ...);
+
+/*
+ * Decode the Nth register property of the given device node and create a bus
+ * space tag and handle for accessing it.  This is for use in setting up things
+ * like early console output before newbus is available.
+ */
+int		OF_decode_addr(phandle_t dev, int regno, bus_space_tag_t *ptag,
+		    bus_space_handle_t *phandle, bus_size_t *sz);
+
+#endif /* _KERNEL */
+#endif /* _DEV_OPENFIRM_H_ */
\ No newline at end of file
diff --git a/cpukit/libfreebsd/freebsd/dev/ofw/ofw_fdt.c b/cpukit/libfreebsd/freebsd/dev/ofw/ofw_fdt.c
new file mode 100644
index 0000000000..e4f72e8142
--- /dev/null
+++ b/cpukit/libfreebsd/freebsd/dev/ofw/ofw_fdt.c
@@ -0,0 +1,479 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2009-2010 The FreeBSD Foundation
+ * All rights reserved.
+ *
+ * This software was developed by Semihalf under sponsorship from
+ * the FreeBSD Foundation.
+ *
+ * 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 AUTHOR AND CONTRIBUTORS ``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 AUTHOR OR CONTRIBUTORS 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/kernel.h>
+#include <sys/malloc.h>
+#include <sys/systm.h>
+
+#include <contrib/libfdt/libfdt.h>
+
+#include <machine/stdarg.h>
+
+#include <dev/fdt/fdt_common.h>
+#include <dev/ofw/ofwvar.h>
+#include <dev/ofw/openfirm.h>
+#include <dev/ofw/ofw_bus_subr.h>
+
+#include "ofw_if.h"
+
+#ifdef DEBUG
+#define debugf(fmt, args...) do { printf("%s(): ", __func__);	\
+    printf(fmt,##args); } while (0)
+#else
+#define debugf(fmt, args...)
+#endif
+
+#if defined(__arm__)
+#if defined(SOC_MV_ARMADAXP) || defined(SOC_MV_ARMADA38X) || \
+    defined(SOC_MV_DISCOVERY) || defined(SOC_MV_DOVE) || \
+    defined(SOC_MV_FREY) || defined(SOC_MV_KIRKWOOD) || \
+    defined(SOC_MV_LOKIPLUS) || defined(SOC_MV_ORION)
+#define FDT_MARVELL
+#endif
+#endif
+
+static int ofw_fdt_init(ofw_t, void *);
+static phandle_t ofw_fdt_peer(ofw_t, phandle_t);
+static phandle_t ofw_fdt_child(ofw_t, phandle_t);
+static phandle_t ofw_fdt_parent(ofw_t, phandle_t);
+static phandle_t ofw_fdt_instance_to_package(ofw_t, ihandle_t);
+static ssize_t ofw_fdt_getproplen(ofw_t, phandle_t, const char *);
+static ssize_t ofw_fdt_getprop(ofw_t, phandle_t, const char *, void *, size_t);
+static int ofw_fdt_nextprop(ofw_t, phandle_t, const char *, char *, size_t);
+static int ofw_fdt_setprop(ofw_t, phandle_t, const char *, const void *,
+    size_t);
+static ssize_t ofw_fdt_canon(ofw_t, const char *, char *, size_t);
+static phandle_t ofw_fdt_finddevice(ofw_t, const char *);
+static ssize_t ofw_fdt_instance_to_path(ofw_t, ihandle_t, char *, size_t);
+static ssize_t ofw_fdt_package_to_path(ofw_t, phandle_t, char *, size_t);
+static int ofw_fdt_interpret(ofw_t, const char *, int, cell_t *);
+
+static ofw_method_t ofw_fdt_methods[] = {
+	OFWMETHOD(ofw_init,			ofw_fdt_init),
+	OFWMETHOD(ofw_peer,			ofw_fdt_peer),
+	OFWMETHOD(ofw_child,			ofw_fdt_child),
+	OFWMETHOD(ofw_parent,			ofw_fdt_parent),
+	OFWMETHOD(ofw_instance_to_package,	ofw_fdt_instance_to_package),
+	OFWMETHOD(ofw_getproplen,		ofw_fdt_getproplen),
+	OFWMETHOD(ofw_getprop,			ofw_fdt_getprop),
+	OFWMETHOD(ofw_nextprop,			ofw_fdt_nextprop),
+	OFWMETHOD(ofw_setprop,			ofw_fdt_setprop),
+	OFWMETHOD(ofw_canon,			ofw_fdt_canon),
+	OFWMETHOD(ofw_finddevice,		ofw_fdt_finddevice),
+	OFWMETHOD(ofw_instance_to_path,		ofw_fdt_instance_to_path),
+	OFWMETHOD(ofw_package_to_path,		ofw_fdt_package_to_path),
+	OFWMETHOD(ofw_interpret,		ofw_fdt_interpret),
+	{ 0, 0 }
+};
+
+static ofw_def_t ofw_fdt = {
+	OFW_FDT,
+	ofw_fdt_methods,
+	0
+};
+OFW_DEF(ofw_fdt);
+
+static void *fdtp = NULL;
+
+static int
+sysctl_handle_dtb(SYSCTL_HANDLER_ARGS)
+{
+
+        return (sysctl_handle_opaque(oidp, fdtp, fdt_totalsize(fdtp), req));
+}
+
+static void
+sysctl_register_fdt_oid(void *arg)
+{
+
+	/* If there is no FDT registered, skip adding the sysctl */
+	if (fdtp == NULL)
+		return;
+
+	SYSCTL_ADD_PROC(NULL, SYSCTL_STATIC_CHILDREN(_hw_fdt), OID_AUTO, "dtb",
+	    CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
+	    sysctl_handle_dtb, "", "Device Tree Blob");
+}
+SYSINIT(dtb_oid, SI_SUB_KMEM, SI_ORDER_ANY, sysctl_register_fdt_oid, NULL);
+
+static int
+ofw_fdt_init(ofw_t ofw, void *data)
+{
+	int err;
+
+	/* Check FDT blob integrity */
+	if ((err = fdt_check_header(data)) != 0)
+		return (err);
+
+	fdtp = data;
+	return (0);
+}
+
+/*
+ * Device tree functions.
+ *
+ * We use the offset from fdtp to the node as the 'phandle' in OF interface.
+ *
+ * phandle is a u32 value, therefore we cannot use the pointer to node as
+ * phandle in 64 bit. We also do not use the usual fdt offset as phandle,
+ * as it can be 0, and the OF interface has special meaning for phandle 0.
+ */
+
+static phandle_t
+fdt_offset_phandle(int offset)
+{
+	if (offset < 0)
+		return (0);
+	return ((phandle_t)offset + fdt_off_dt_struct(fdtp));
+}
+
+static int
+fdt_phandle_offset(phandle_t p)
+{
+	int pint = (int)p;
+	int dtoff = fdt_off_dt_struct(fdtp);
+
+	if (pint < dtoff)
+		return (-1);
+	return (pint - dtoff);
+}
+
+/* Return the next sibling of this node or 0. */
+static phandle_t
+ofw_fdt_peer(ofw_t ofw, phandle_t node)
+{
+	int offset;
+
+	if (node == 0) {
+		/* Find root node */
+		offset = fdt_path_offset(fdtp, "/");
+
+		return (fdt_offset_phandle(offset));
+	}
+
+	offset = fdt_phandle_offset(node);
+	if (offset < 0)
+		return (0);
+	offset = fdt_next_subnode(fdtp, offset);
+	return (fdt_offset_phandle(offset));
+}
+
+/* Return the first child of this node or 0. */
+static phandle_t
+ofw_fdt_child(ofw_t ofw, phandle_t node)
+{
+	int offset;
+
+	offset = fdt_phandle_offset(node);
+	if (offset < 0)
+		return (0);
+	offset = fdt_first_subnode(fdtp, offset);
+	return (fdt_offset_phandle(offset));
+}
+
+/* Return the parent of this node or 0. */
+static phandle_t
+ofw_fdt_parent(ofw_t ofw, phandle_t node)
+{
+	int offset, paroffset;
+
+	offset = fdt_phandle_offset(node);
+	if (offset < 0)
+		return (0);
+
+	paroffset = fdt_parent_offset(fdtp, offset);
+	return (fdt_offset_phandle(paroffset));
+}
+
+/* Return the package handle that corresponds to an instance handle. */
+static phandle_t
+ofw_fdt_instance_to_package(ofw_t ofw, ihandle_t instance)
+{
+
+	/* Where real OF uses ihandles in the tree, FDT uses xref phandles */
+	return (OF_node_from_xref(instance));
+}
+
+/* Get the length of a property of a package. */
+static ssize_t
+ofw_fdt_getproplen(ofw_t ofw, phandle_t package, const char *propname)
+{
+	const void *prop;
+	int offset, len;
+
+	offset = fdt_phandle_offset(package);
+	if (offset < 0)
+		return (-1);
+
+	len = -1;
+	prop = fdt_getprop(fdtp, offset, propname, &len);
+
+	if (prop == NULL && strcmp(propname, "name") == 0) {
+		/* Emulate the 'name' property */
+		fdt_get_name(fdtp, offset, &len);
+		return (len + 1);
+	}
+
+	if (prop == NULL && offset == fdt_path_offset(fdtp, "/chosen")) {
+		if (strcmp(propname, "fdtbootcpu") == 0)
+			return (sizeof(cell_t));
+		if (strcmp(propname, "fdtmemreserv") == 0)
+			return (sizeof(uint64_t)*2*fdt_num_mem_rsv(fdtp));
+	}
+
+	if (prop == NULL)
+		return (-1);
+
+	return (len);
+}
+
+/* Get the value of a property of a package. */
+static ssize_t
+ofw_fdt_getprop(ofw_t ofw, phandle_t package, const char *propname, void *buf,
+    size_t buflen)
+{
+	const void *prop;
+	const char *name;
+	int len, offset;
+	uint32_t cpuid;
+
+	offset = fdt_phandle_offset(package);
+	if (offset < 0)
+		return (-1);
+
+	prop = fdt_getprop(fdtp, offset, propname, &len);
+
+	if (prop == NULL && strcmp(propname, "name") == 0) {
+		/* Emulate the 'name' property */
+		name = fdt_get_name(fdtp, offset, &len);
+		strncpy(buf, name, buflen);
+		return (len + 1);
+	}
+
+	if (prop == NULL && offset == fdt_path_offset(fdtp, "/chosen")) {
+		if (strcmp(propname, "fdtbootcpu") == 0) {
+			cpuid = cpu_to_fdt32(fdt_boot_cpuid_phys(fdtp));
+			len = sizeof(cpuid);
+			prop = &cpuid;
+		}
+		if (strcmp(propname, "fdtmemreserv") == 0) {
+			prop = (char *)fdtp + fdt_off_mem_rsvmap(fdtp);
+			len = sizeof(uint64_t)*2*fdt_num_mem_rsv(fdtp);
+		}
+	}
+
+	if (prop == NULL)
+		return (-1);
+
+	bcopy(prop, buf, min(len, buflen));
+
+	return (len);
+}
+
+/*
+ * Get the next property of a package. Return values:
+ *  -1: package or previous property does not exist
+ *   0: no more properties
+ *   1: success
+ */
+static int
+ofw_fdt_nextprop(ofw_t ofw, phandle_t package, const char *previous, char *buf,
+    size_t size)
+{
+	const void *prop;
+	const char *name;
+	int offset;
+
+	offset = fdt_phandle_offset(package);
+	if (offset < 0)
+		return (-1);
+
+	if (previous == NULL)
+		/* Find the first prop in the node */
+		offset = fdt_first_property_offset(fdtp, offset);
+	else {
+		fdt_for_each_property_offset(offset, fdtp, offset) {
+			prop = fdt_getprop_by_offset(fdtp, offset, &name, NULL);
+			if (prop == NULL)
+				return (-1); /* Internal error */
+			/* Skip until we find 'previous', then bail out */
+			if (strcmp(name, previous) != 0)
+				continue;
+			offset = fdt_next_property_offset(fdtp, offset);
+			break;
+		}
+	}
+
+	if (offset < 0)
+		return (0); /* No properties */
+
+	prop = fdt_getprop_by_offset(fdtp, offset, &name, &offset);
+	if (prop == NULL)
+		return (-1); /* Internal error */
+
+	strncpy(buf, name, size);
+
+	return (1);
+}
+
+/* Set the value of a property of a package. */
+static int
+ofw_fdt_setprop(ofw_t ofw, phandle_t package, const char *propname,
+    const void *buf, size_t len)
+{
+	int offset;
+
+	offset = fdt_phandle_offset(package);
+	if (offset < 0)
+		return (-1);
+
+	if (fdt_setprop_inplace(fdtp, offset, propname, buf, len) != 0)
+		/* Try to add property, when setting value inplace failed */
+		return (fdt_setprop(fdtp, offset, propname, buf, len));
+
+	return (0);
+}
+
+/* Convert a device specifier to a fully qualified pathname. */
+static ssize_t
+ofw_fdt_canon(ofw_t ofw, const char *device, char *buf, size_t len)
+{
+
+	return (-1);
+}
+
+/* Return a package handle for the specified device. */
+static phandle_t
+ofw_fdt_finddevice(ofw_t ofw, const char *device)
+{
+	int offset;
+
+	offset = fdt_path_offset(fdtp, device);
+	if (offset < 0)
+		return (-1);
+	return (fdt_offset_phandle(offset));
+}
+
+/* Return the fully qualified pathname corresponding to an instance. */
+static ssize_t
+ofw_fdt_instance_to_path(ofw_t ofw, ihandle_t instance, char *buf, size_t len)
+{
+	phandle_t phandle;
+
+	phandle = OF_instance_to_package(instance);
+	if (phandle == -1)
+		return (-1);
+
+	return (OF_package_to_path(phandle, buf, len));
+}
+
+/* Return the fully qualified pathname corresponding to a package. */
+static ssize_t
+ofw_fdt_package_to_path(ofw_t ofw, phandle_t package, char *buf, size_t len)
+{
+
+	return (-1);
+}
+
+#if defined(FDT_MARVELL)
+static int
+ofw_fdt_fixup(ofw_t ofw)
+{
+#define FDT_MODEL_LEN	80
+	char model[FDT_MODEL_LEN];
+	phandle_t root;
+	ssize_t len;
+	int i;
+
+	if ((root = ofw_fdt_finddevice(ofw, "/")) == -1)
+		return (ENODEV);
+
+	if ((len = ofw_fdt_getproplen(ofw, root, "model")) <= 0)
+		return (0);
+
+	bzero(model, FDT_MODEL_LEN);
+	if (ofw_fdt_getprop(ofw, root, "model", model, FDT_MODEL_LEN) <= 0)
+		return (0);
+
+	/*
+	 * Search fixup table and call handler if appropriate.
+	 */
+	for (i = 0; fdt_fixup_table[i].model != NULL; i++) {
+		if (strncmp(model, fdt_fixup_table[i].model,
+		    FDT_MODEL_LEN) != 0)
+			/*
+			 * Sometimes it's convenient to provide one
+			 * fixup entry that refers to many boards.
+			 * To handle this case, simply check if model
+			 * is compatible parameter
+			 */
+			if(!ofw_bus_node_is_compatible(root,
+			    fdt_fixup_table[i].model))
+				continue;
+
+		if (fdt_fixup_table[i].handler != NULL)
+			(*fdt_fixup_table[i].handler)(root);
+	}
+
+	return (0);
+}
+#endif
+
+static int
+ofw_fdt_interpret(ofw_t ofw, const char *cmd, int nret, cell_t *retvals)
+{
+#if defined(FDT_MARVELL)
+	int rv;
+
+	/*
+	 * Note: FDT does not have the possibility to 'interpret' commands,
+	 * but we abuse the interface a bit to use it for doing non-standard
+	 * operations on the device tree blob.
+	 *
+	 * Currently the only supported 'command' is to trigger performing
+	 * fixups.
+	 */
+	if (strncmp("perform-fixup", cmd, 13) != 0)
+		return (0);
+
+	rv = ofw_fdt_fixup(ofw);
+	if (nret > 0)
+		retvals[0] = rv;
+
+	return (rv);
+#else
+	return (0);
+#endif
+}
\ No newline at end of file
diff --git a/cpukit/libfreebsd/freebsd/dev/ofw/openfirm.c b/cpukit/libfreebsd/freebsd/dev/ofw/openfirm.c
new file mode 100644
index 0000000000..50ebf2cf16
--- /dev/null
+++ b/cpukit/libfreebsd/freebsd/dev/ofw/openfirm.c
@@ -0,0 +1,848 @@
+/*	$NetBSD: Locore.c,v 1.7 2000/08/20 07:04:59 tsubai Exp $	*/
+
+/*-
+ * SPDX-License-Identifier: BSD-4-Clause
+ *
+ * Copyright (C) 1995, 1996 Wolfgang Solfrank.
+ * Copyright (C) 1995, 1996 TooLs GmbH.
+ * All rights reserved.
+ *
+ * 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.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by TooLs GmbH.
+ * 4. The name of TooLs GmbH may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``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 TOOLS GMBH 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.
+ */
+/*-
+ * Copyright (C) 2000 Benno Rice.
+ * All rights reserved.
+ *
+ * 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 Benno Rice ``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 TOOLS GMBH 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include "opt_platform.h"
+
+#include <sys/param.h>
+#include <sys/kernel.h>
+#include <sys/lock.h>
+#include <sys/malloc.h>
+#include <sys/mutex.h>
+#include <sys/queue.h>
+#include <sys/systm.h>
+#include <sys/endian.h>
+
+#include <machine/stdarg.h>
+
+#include <dev/ofw/ofwvar.h>
+#include <dev/ofw/openfirm.h>
+
+#include "ofw_if.h"
+
+static void OF_putchar(int c, void *arg);
+
+MALLOC_DEFINE(M_OFWPROP, "openfirm", "Open Firmware properties");
+
+static ihandle_t stdout;
+
+static ofw_def_t	*ofw_def_impl = NULL;
+static ofw_t		ofw_obj;
+static struct ofw_kobj	ofw_kernel_obj;
+static struct kobj_ops	ofw_kernel_kops;
+
+struct xrefinfo {
+	phandle_t	xref;
+	phandle_t 	node;
+	device_t  	dev;
+	SLIST_ENTRY(xrefinfo) next_entry;
+};
+
+static SLIST_HEAD(, xrefinfo) xreflist = SLIST_HEAD_INITIALIZER(xreflist);
+static struct mtx xreflist_lock;
+static boolean_t xref_init_done;
+
+#define	FIND_BY_XREF	0
+#define	FIND_BY_NODE	1
+#define	FIND_BY_DEV	2
+
+/*
+ * xref-phandle-device lookup helper routines.
+ *
+ * As soon as we are able to use malloc(), walk the node tree and build a list
+ * of info that cross-references node handles, xref handles, and device_t
+ * instances.  This list exists primarily to allow association of a device_t
+ * with an xref handle, but it is also used to speed up translation between xref
+ * and node handles.  Before malloc() is available we have to recursively search
+ * the node tree each time we want to translate between a node and xref handle.
+ * Afterwards we can do the translations by searching this much shorter list.
+ */
+static void
+xrefinfo_create(phandle_t node)
+{
+	struct xrefinfo * xi;
+	phandle_t child, xref;
+
+	/*
+	 * Recursively descend from parent, looking for nodes with a property
+	 * named either "phandle", "ibm,phandle", or "linux,phandle".  For each
+	 * such node found create an entry in the xreflist.
+	 */
+	for (child = OF_child(node); child != 0; child = OF_peer(child)) {
+		xrefinfo_create(child);
+		if (OF_getencprop(child, "phandle", &xref, sizeof(xref)) ==
+		    -1 && OF_getencprop(child, "ibm,phandle", &xref,
+		    sizeof(xref)) == -1 && OF_getencprop(child,
+		    "linux,phandle", &xref, sizeof(xref)) == -1)
+			continue;
+		xi = malloc(sizeof(*xi), M_OFWPROP, M_WAITOK | M_ZERO);
+		xi->node = child;
+		xi->xref = xref;
+		SLIST_INSERT_HEAD(&xreflist, xi, next_entry);
+	}
+}
+
+static void
+xrefinfo_init(void *unsed)
+{
+
+	/*
+	 * There is no locking during this init because it runs much earlier
+	 * than any of the clients/consumers of the xref list data, but we do
+	 * initialize the mutex that will be used for access later.
+	 */
+	mtx_init(&xreflist_lock, "OF xreflist lock", NULL, MTX_DEF);
+	xrefinfo_create(OF_peer(0));
+	xref_init_done = true;
+}
+SYSINIT(xrefinfo, SI_SUB_KMEM, SI_ORDER_ANY, xrefinfo_init, NULL);
+
+static struct xrefinfo *
+xrefinfo_find(uintptr_t key, int find_by)
+{
+	struct xrefinfo *rv, *xi;
+
+	rv = NULL;
+	mtx_lock(&xreflist_lock);
+	SLIST_FOREACH(xi, &xreflist, next_entry) {
+		if ((find_by == FIND_BY_XREF && (phandle_t)key == xi->xref) ||
+		    (find_by == FIND_BY_NODE && (phandle_t)key == xi->node) ||
+		    (find_by == FIND_BY_DEV && key == (uintptr_t)xi->dev)) {
+			rv = xi;
+			break;
+		}
+	}
+	mtx_unlock(&xreflist_lock);
+	return (rv);
+}
+
+static struct xrefinfo *
+xrefinfo_add(phandle_t node, phandle_t xref, device_t dev)
+{
+	struct xrefinfo *xi;
+
+	xi = malloc(sizeof(*xi), M_OFWPROP, M_WAITOK);
+	xi->node = node;
+	xi->xref = xref;
+	xi->dev  = dev;
+	mtx_lock(&xreflist_lock);
+	SLIST_INSERT_HEAD(&xreflist, xi, next_entry);
+	mtx_unlock(&xreflist_lock);
+	return (xi);
+}
+
+/*
+ * OFW install routines.  Highest priority wins, equal priority also
+ * overrides allowing last-set to win.
+ */
+SET_DECLARE(ofw_set, ofw_def_t);
+
+boolean_t
+OF_install(char *name, int prio)
+{
+	ofw_def_t *ofwp, **ofwpp;
+	static int curr_prio = 0;
+
+	/* Allow OF layer to be uninstalled */
+	if (name == NULL) {
+		ofw_def_impl = NULL;
+		return (FALSE);
+	}
+
+	/*
+	 * Try and locate the OFW kobj corresponding to the name.
+	 */
+	SET_FOREACH(ofwpp, ofw_set) {
+		ofwp = *ofwpp;
+
+		if (ofwp->name &&
+		    !strcmp(ofwp->name, name) &&
+		    prio >= curr_prio) {
+			curr_prio = prio;
+			ofw_def_impl = ofwp;
+			return (TRUE);
+		}
+	}
+
+	return (FALSE);
+}
+
+/* Initializer */
+int
+OF_init(void *cookie)
+{
+	phandle_t chosen;
+	int rv;
+
+	if (ofw_def_impl == NULL)
+		return (-1);
+
+	ofw_obj = &ofw_kernel_obj;
+	/*
+	 * Take care of compiling the selected class, and
+	 * then statically initialize the OFW object.
+	 */
+	kobj_class_compile_static(ofw_def_impl, &ofw_kernel_kops);
+	kobj_init_static((kobj_t)ofw_obj, ofw_def_impl);
+
+	rv = OFW_INIT(ofw_obj, cookie);
+
+	if ((chosen = OF_finddevice("/chosen")) != -1)
+		if (OF_getencprop(chosen, "stdout", &stdout,
+		    sizeof(stdout)) == -1)
+			stdout = -1;
+
+	return (rv);
+}
+
+static void
+OF_putchar(int c, void *arg __unused)
+{
+	char cbuf;
+
+	if (c == '\n') {
+		cbuf = '\r';
+		OF_write(stdout, &cbuf, 1);
+	}
+
+	cbuf = c;
+	OF_write(stdout, &cbuf, 1);
+}
+
+void
+OF_printf(const char *fmt, ...)
+{
+	va_list	va;
+
+	va_start(va, fmt);
+	(void)kvprintf(fmt, OF_putchar, NULL, 10, va);
+	va_end(va);
+}
+
+/*
+ * Generic functions
+ */
+
+/* Test to see if a service exists. */
+int
+OF_test(const char *name)
+{
+
+	if (ofw_def_impl == NULL)
+		return (-1);
+
+	return (OFW_TEST(ofw_obj, name));
+}
+
+int
+OF_interpret(const char *cmd, int nreturns, ...)
+{
+	va_list ap;
+	cell_t slots[16];
+	int i = 0;
+	int status;
+
+	if (ofw_def_impl == NULL)
+		return (-1);
+
+	status = OFW_INTERPRET(ofw_obj, cmd, nreturns, slots);
+	if (status == -1)
+		return (status);
+
+	va_start(ap, nreturns);
+	while (i < nreturns)
+		*va_arg(ap, cell_t *) = slots[i++];
+	va_end(ap);
+
+	return (status);
+}
+
+/*
+ * Device tree functions
+ */
+
+/* Return the next sibling of this node or 0. */
+phandle_t
+OF_peer(phandle_t node)
+{
+
+	if (ofw_def_impl == NULL)
+		return (0);
+
+	return (OFW_PEER(ofw_obj, node));
+}
+
+/* Return the first child of this node or 0. */
+phandle_t
+OF_child(phandle_t node)
+{
+
+	if (ofw_def_impl == NULL)
+		return (0);
+
+	return (OFW_CHILD(ofw_obj, node));
+}
+
+/* Return the parent of this node or 0. */
+phandle_t
+OF_parent(phandle_t node)
+{
+
+	if (ofw_def_impl == NULL)
+		return (0);
+
+	return (OFW_PARENT(ofw_obj, node));
+}
+
+/* Return the package handle that corresponds to an instance handle. */
+phandle_t
+OF_instance_to_package(ihandle_t instance)
+{
+
+	if (ofw_def_impl == NULL)
+		return (-1);
+
+	return (OFW_INSTANCE_TO_PACKAGE(ofw_obj, instance));
+}
+
+/* Get the length of a property of a package. */
+ssize_t
+OF_getproplen(phandle_t package, const char *propname)
+{
+
+	if (ofw_def_impl == NULL)
+		return (-1);
+
+	return (OFW_GETPROPLEN(ofw_obj, package, propname));
+}
+
+/* Check existence of a property of a package. */
+int
+OF_hasprop(phandle_t package, const char *propname)
+{
+
+	return (OF_getproplen(package, propname) >= 0 ? 1 : 0);
+}
+
+/* Get the value of a property of a package. */
+ssize_t
+OF_getprop(phandle_t package, const char *propname, void *buf, size_t buflen)
+{
+
+	if (ofw_def_impl == NULL)
+		return (-1);
+
+	return (OFW_GETPROP(ofw_obj, package, propname, buf, buflen));
+}
+
+ssize_t
+OF_getencprop(phandle_t node, const char *propname, pcell_t *buf, size_t len)
+{
+	ssize_t retval;
+	int i;
+
+	KASSERT(len % 4 == 0, ("Need a multiple of 4 bytes"));
+
+	retval = OF_getprop(node, propname, buf, len);
+	if (retval <= 0)
+		return (retval);
+
+	for (i = 0; i < len/4; i++)
+		buf[i] = be32toh(buf[i]);
+
+	return (retval);
+}
+
+/*
+ * Recursively search the node and its parent for the given property, working
+ * downward from the node to the device tree root.  Returns the value of the
+ * first match.
+ */
+ssize_t
+OF_searchprop(phandle_t node, const char *propname, void *buf, size_t len)
+{
+	ssize_t rv;
+
+	for (; node != 0; node = OF_parent(node))
+		if ((rv = OF_getprop(node, propname, buf, len)) != -1)
+			return (rv);
+	return (-1);
+}
+
+ssize_t
+OF_searchencprop(phandle_t node, const char *propname, pcell_t *buf, size_t len)
+{
+	ssize_t rv;
+
+	for (; node != 0; node = OF_parent(node))
+		if ((rv = OF_getencprop(node, propname, buf, len)) != -1)
+			return (rv);
+	return (-1);
+}
+
+/*
+ * Store the value of a property of a package into newly allocated memory
+ * (using the M_OFWPROP malloc pool and M_WAITOK).
+ */
+ssize_t
+OF_getprop_alloc(phandle_t package, const char *propname, void **buf)
+{
+	int len;
+
+	*buf = NULL;
+	if ((len = OF_getproplen(package, propname)) == -1)
+		return (-1);
+
+	if (len > 0) {
+		*buf = malloc(len, M_OFWPROP, M_WAITOK);
+		if (OF_getprop(package, propname, *buf, len) == -1) {
+			free(*buf, M_OFWPROP);
+			*buf = NULL;
+			return (-1);
+		}
+	}
+	return (len);
+}
+
+/*
+ * Store the value of a property of a package into newly allocated memory
+ * (using the M_OFWPROP malloc pool and M_WAITOK).  elsz is the size of a
+ * single element, the number of elements is return in number.
+ */
+ssize_t
+OF_getprop_alloc_multi(phandle_t package, const char *propname, int elsz, void **buf)
+{
+	int len;
+
+	*buf = NULL;
+	if ((len = OF_getproplen(package, propname)) == -1 ||
+	    len % elsz != 0)
+		return (-1);
+
+	if (len > 0) {
+		*buf = malloc(len, M_OFWPROP, M_WAITOK);
+		if (OF_getprop(package, propname, *buf, len) == -1) {
+			free(*buf, M_OFWPROP);
+			*buf = NULL;
+			return (-1);
+		}
+	}
+	return (len / elsz);
+}
+
+ssize_t
+OF_getencprop_alloc(phandle_t package, const char *name, void **buf)
+{
+	ssize_t ret;
+
+	ret = OF_getencprop_alloc_multi(package, name, sizeof(pcell_t),
+	    buf);
+	if (ret < 0)
+		return (ret);
+	else
+		return (ret * sizeof(pcell_t));
+}
+
+ssize_t
+OF_getencprop_alloc_multi(phandle_t package, const char *name, int elsz,
+    void **buf)
+{
+	ssize_t retval;
+	pcell_t *cell;
+	int i;
+
+	retval = OF_getprop_alloc_multi(package, name, elsz, buf);
+	if (retval == -1)
+		return (-1);
+
+	cell = *buf;
+	for (i = 0; i < retval * elsz / 4; i++)
+		cell[i] = be32toh(cell[i]);
+
+	return (retval);
+}
+
+/* Free buffer allocated by OF_getencprop_alloc or OF_getprop_alloc */
+void OF_prop_free(void *buf)
+{
+
+	free(buf, M_OFWPROP);
+}
+
+/* Get the next property of a package. */
+int
+OF_nextprop(phandle_t package, const char *previous, char *buf, size_t size)
+{
+
+	if (ofw_def_impl == NULL)
+		return (-1);
+
+	return (OFW_NEXTPROP(ofw_obj, package, previous, buf, size));
+}
+
+/* Set the value of a property of a package. */
+int
+OF_setprop(phandle_t package, const char *propname, const void *buf, size_t len)
+{
+
+	if (ofw_def_impl == NULL)
+		return (-1);
+
+	return (OFW_SETPROP(ofw_obj, package, propname, buf,len));
+}
+
+/* Convert a device specifier to a fully qualified pathname. */
+ssize_t
+OF_canon(const char *device, char *buf, size_t len)
+{
+
+	if (ofw_def_impl == NULL)
+		return (-1);
+
+	return (OFW_CANON(ofw_obj, device, buf, len));
+}
+
+/* Return a package handle for the specified device. */
+phandle_t
+OF_finddevice(const char *device)
+{
+
+	if (ofw_def_impl == NULL)
+		return (-1);
+
+	return (OFW_FINDDEVICE(ofw_obj, device));
+}
+
+/* Return the fully qualified pathname corresponding to an instance. */
+ssize_t
+OF_instance_to_path(ihandle_t instance, char *buf, size_t len)
+{
+
+	if (ofw_def_impl == NULL)
+		return (-1);
+
+	return (OFW_INSTANCE_TO_PATH(ofw_obj, instance, buf, len));
+}
+
+/* Return the fully qualified pathname corresponding to a package. */
+ssize_t
+OF_package_to_path(phandle_t package, char *buf, size_t len)
+{
+
+	if (ofw_def_impl == NULL)
+		return (-1);
+
+	return (OFW_PACKAGE_TO_PATH(ofw_obj, package, buf, len));
+}
+
+/* Look up effective phandle (see FDT/PAPR spec) */
+static phandle_t
+OF_child_xref_phandle(phandle_t parent, phandle_t xref)
+{
+	phandle_t child, rxref;
+
+	/*
+	 * Recursively descend from parent, looking for a node with a property
+	 * named either "phandle", "ibm,phandle", or "linux,phandle" that
+	 * matches the xref we are looking for.
+	 */
+
+	for (child = OF_child(parent); child != 0; child = OF_peer(child)) {
+		rxref = OF_child_xref_phandle(child, xref);
+		if (rxref != -1)
+			return (rxref);
+
+		if (OF_getencprop(child, "phandle", &rxref, sizeof(rxref)) ==
+		    -1 && OF_getencprop(child, "ibm,phandle", &rxref,
+		    sizeof(rxref)) == -1 && OF_getencprop(child,
+		    "linux,phandle", &rxref, sizeof(rxref)) == -1)
+			continue;
+
+		if (rxref == xref)
+			return (child);
+	}
+
+	return (-1);
+}
+
+phandle_t
+OF_node_from_xref(phandle_t xref)
+{
+	struct xrefinfo *xi;
+	phandle_t node;
+
+	if (xref_init_done) {
+		if ((xi = xrefinfo_find(xref, FIND_BY_XREF)) == NULL)
+			return (xref);
+		return (xi->node);
+	}
+
+	if ((node = OF_child_xref_phandle(OF_peer(0), xref)) == -1)
+		return (xref);
+	return (node);
+}
+
+phandle_t
+OF_xref_from_node(phandle_t node)
+{
+	struct xrefinfo *xi;
+	phandle_t xref;
+
+	if (xref_init_done) {
+		if ((xi = xrefinfo_find(node, FIND_BY_NODE)) == NULL)
+			return (node);
+		return (xi->xref);
+	}
+
+	if (OF_getencprop(node, "phandle", &xref, sizeof(xref)) == -1 &&
+	    OF_getencprop(node, "ibm,phandle", &xref, sizeof(xref)) == -1 &&
+	    OF_getencprop(node, "linux,phandle", &xref, sizeof(xref)) == -1)
+		return (node);
+	return (xref);
+}
+
+device_t
+OF_device_from_xref(phandle_t xref)
+{
+	struct xrefinfo *xi;
+
+	if (xref_init_done) {
+		if ((xi = xrefinfo_find(xref, FIND_BY_XREF)) == NULL)
+			return (NULL);
+		return (xi->dev);
+	}
+	panic("Attempt to find device before xreflist_init");
+}
+
+phandle_t
+OF_xref_from_device(device_t dev)
+{
+	struct xrefinfo *xi;
+
+	if (xref_init_done) {
+		if ((xi = xrefinfo_find((uintptr_t)dev, FIND_BY_DEV)) == NULL)
+			return (0);
+		return (xi->xref);
+	}
+	panic("Attempt to find xref before xreflist_init");
+}
+
+int
+OF_device_register_xref(phandle_t xref, device_t dev)
+{
+	struct xrefinfo *xi;
+
+	/*
+	 * If the given xref handle doesn't already exist in the list then we
+	 * add a list entry.  In theory this can only happen on a system where
+	 * nodes don't contain phandle properties and xref and node handles are
+	 * synonymous, so the xref handle is added as the node handle as well.
+	 */
+	if (xref_init_done) {
+		if ((xi = xrefinfo_find(xref, FIND_BY_XREF)) == NULL)
+			xrefinfo_add(xref, xref, dev);
+		else 
+			xi->dev = dev;
+		return (0);
+	}
+	panic("Attempt to register device before xreflist_init");
+}
+
+/*  Call the method in the scope of a given instance. */
+int
+OF_call_method(const char *method, ihandle_t instance, int nargs, int nreturns,
+    ...)
+{
+	va_list ap;
+	cell_t args_n_results[12];
+	int n, status;
+
+	if (nargs > 6 || ofw_def_impl == NULL)
+		return (-1);
+	va_start(ap, nreturns);
+	for (n = 0; n < nargs; n++)
+		args_n_results[n] = va_arg(ap, cell_t);
+
+	status = OFW_CALL_METHOD(ofw_obj, instance, method, nargs, nreturns,
+	    args_n_results);
+	if (status != 0)
+		return (status);
+
+	for (; n < nargs + nreturns; n++)
+		*va_arg(ap, cell_t *) = args_n_results[n];
+	va_end(ap);
+	return (0);
+}
+
+/*
+ * Device I/O functions
+ */
+
+/* Open an instance for a device. */
+ihandle_t
+OF_open(const char *device)
+{
+
+	if (ofw_def_impl == NULL)
+		return (0);
+
+	return (OFW_OPEN(ofw_obj, device));
+}
+
+/* Close an instance. */
+void
+OF_close(ihandle_t instance)
+{
+
+	if (ofw_def_impl == NULL)
+		return;
+
+	OFW_CLOSE(ofw_obj, instance);
+}
+
+/* Read from an instance. */
+ssize_t
+OF_read(ihandle_t instance, void *addr, size_t len)
+{
+
+	if (ofw_def_impl == NULL)
+		return (-1);
+
+	return (OFW_READ(ofw_obj, instance, addr, len));
+}
+
+/* Write to an instance. */
+ssize_t
+OF_write(ihandle_t instance, const void *addr, size_t len)
+{
+
+	if (ofw_def_impl == NULL)
+		return (-1);
+
+	return (OFW_WRITE(ofw_obj, instance, addr, len));
+}
+
+/* Seek to a position. */
+int
+OF_seek(ihandle_t instance, uint64_t pos)
+{
+
+	if (ofw_def_impl == NULL)
+		return (-1);
+
+	return (OFW_SEEK(ofw_obj, instance, pos));
+}
+
+/*
+ * Memory functions
+ */
+
+/* Claim an area of memory. */
+void *
+OF_claim(void *virt, size_t size, u_int align)
+{
+
+	if (ofw_def_impl == NULL)
+		return ((void *)-1);
+
+	return (OFW_CLAIM(ofw_obj, virt, size, align));
+}
+
+/* Release an area of memory. */
+void
+OF_release(void *virt, size_t size)
+{
+
+	if (ofw_def_impl == NULL)
+		return;
+
+	OFW_RELEASE(ofw_obj, virt, size);
+}
+
+/*
+ * Control transfer functions
+ */
+
+/* Suspend and drop back to the Open Firmware interface. */
+void
+OF_enter()
+{
+
+	if (ofw_def_impl == NULL)
+		return;
+
+	OFW_ENTER(ofw_obj);
+}
+
+/* Shut down and drop back to the Open Firmware interface. */
+void
+OF_exit()
+{
+
+	if (ofw_def_impl == NULL)
+		panic("OF_exit: Open Firmware not available");
+
+	/* Should not return */
+	OFW_EXIT(ofw_obj);
+
+	for (;;)			/* just in case */
+		;
+}
\ No newline at end of file
-- 
2.17.1



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