Provide storage for an undi_device structure representing the preloaded

UNDI stack.

src/arch/i386/drivers/net/undipreload.c

@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2007 Michael Brown <mbrown@fensystems.co.uk>.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <realmode.h>
+#include <undipreload.h>
+
+/** @file
+ *
+ * Preloaded UNDI stack
+ *
+ */
+
+/**
+ * Preloaded UNDI device
+ *
+ * This is the UNDI device that was present when Etherboot started
+ * execution (i.e. when loading a .kpxe image).  The first driver to
+ * claim this device must zero out this data structure.
+ */
+struct undi_device __data16 ( preloaded_undi );

src/arch/i386/include/undipreload.h

@@ -0,0 +1,16 @@
+#ifndef _UNDIPRELOAD_H
+#define _UNDIPRELOAD_H
+
+/** @file
+ *
+ * Preloaded UNDI stack
+ *
+ */
+
+#include <realmode.h>
+#include <undi.h>
+
+extern struct undi_device __data16 ( preloaded_undi );
+#define preloaded_undi __use_data16 ( preloaded_undi )
+
+#endif /* _UNDIPRELOAD_H */