[POWERPC] Add flatdevtree source

Add the latest version of the flatdevtree code and corresponding glue.

A phandle table now tracks values returned by ft_find_device().
The value returned by ft_find_device() is a phandle which is really
an index into the phandle table.  The phandle table contains the address
of the corresponding node.  When the flat dt is edited/moved, the node
pointers in the phandle table are updated accordingly so no phandles kept
by the caller become stale.

Signed-off-by: Mark A. Greer <mgreer@mvista.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/boot/flatdevtree_misc.c

@@ -0,0 +1,56 @@
+/*
+ * This file does the necessary interface mapping between the bootwrapper
+ * device tree operations and the interface provided by shared source
+ * files flatdevicetree.[ch].
+ *
+ * Author: Mark A. Greer <mgreer@mvista.com>
+ *
+ * 2006 (c) MontaVista Software, Inc.  This file is licensed under
+ * the terms of the GNU General Public License version 2.  This program
+ * is licensed "as is" without any warranty of any kind, whether express
+ * or implied.
+ */
+#include <stddef.h>
+#include "flatdevtree.h"
+#include "ops.h"
+
+static struct ft_cxt cxt;
+
+static void *ft_finddevice(const char *name)
+{
+	return ft_find_device(&cxt, name);
+}
+
+static int ft_getprop(const void *phandle, const char *propname, void *buf,
+		const int buflen)
+{
+	return ft_get_prop(&cxt, phandle, propname, buf, buflen);
+}
+
+static int ft_setprop(const void *phandle, const char *propname,
+		const void *buf, const int buflen)
+{
+	return ft_set_prop(&cxt, phandle, propname, buf, buflen);
+}
+
+static void ft_pack(void)
+{
+	ft_end_tree(&cxt);
+}
+
+static unsigned long ft_addr(void)
+{
+	return (unsigned long)cxt.bph;
+}
+
+int ft_init(void *dt_blob, unsigned int max_size, unsigned int max_find_device)
+{
+	dt_ops.finddevice = ft_finddevice;
+	dt_ops.getprop = ft_getprop;
+	dt_ops.setprop = ft_setprop;
+	dt_ops.ft_pack = ft_pack;
+	dt_ops.ft_addr = ft_addr;
+
+	return ft_open(&cxt, dt_blob, max_size, max_find_device,
+			platform_ops.realloc);
+}