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diff --git a/include/mach/policy.h b/include/mach/policy.h
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+/* 
+ * Mach Operating System
+ * Copyright (c) 1991,1990,1989,1988 Carnegie Mellon University
+ * All Rights Reserved.
+ * 
+ * Permission to use, copy, modify and distribute this software and its
+ * documentation is hereby granted, provided that both the copyright
+ * notice and this permission notice appear in all copies of the
+ * software, derivative works or modified versions, and any portions
+ * thereof, and that both notices appear in supporting documentation.
+ * 
+ * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
+ * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
+ * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ * 
+ * Carnegie Mellon requests users of this software to return to
+ * 
+ *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
+ *  School of Computer Science
+ *  Carnegie Mellon University
+ *  Pittsburgh PA 15213-3890
+ * 
+ * any improvements or extensions that they make and grant Carnegie Mellon
+ * the rights to redistribute these changes.
+ */
+
+#ifndef	_MACH_POLICY_H_
+#define _MACH_POLICY_H_
+
+/*
+ *	mach/policy.h
+ *
+ *	Definitions for scheduing policy.
+ */
+
+/*
+ *	Policy definitions.  Policies must be powers of 2.
+ */
+#define	POLICY_TIMESHARE	1
+#define POLICY_FIXEDPRI		2
+#define POLICY_LAST		2
+
+#define invalid_policy(policy)	(((policy) <= 0) || ((policy) > POLICY_LAST))
+
+#endif /* _MACH_POLICY_H_ */