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diff --git a/vm/vm_types.h b/vm/vm_types.h
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+/*
+ * Copyright (C) 2007 Free Software Foundation, Inc.
+ * 
+ * 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, or (at your option) 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * 
+ * Written by Thomas Schwinge.
+ */
+
+#ifndef VM_VM_TYPES_H
+#define VM_VM_TYPES_H
+
+/*
+ *	Types defined:
+ *
+ *	vm_map_t		the high-level address map data structure.
+ *	vm_object_t		Virtual memory object.
+ *	vm_page_t		See `vm/vm_page.h'.
+ */
+
+typedef struct vm_map *vm_map_t;
+#define VM_MAP_NULL ((vm_map_t) 0)
+
+typedef struct vm_object *vm_object_t;
+#define VM_OBJECT_NULL ((vm_object_t) 0)
+
+typedef struct vm_page *vm_page_t;
+#define VM_PAGE_NULL ((vm_page_t) 0)
+
+
+#endif /* VM_VM_TYPES_H */