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diff --git a/include/mach/time_value.h b/include/mach/time_value.h
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+/* 
+ * Mach Operating System
+ * Copyright (c) 1991,1990,1989,1988,1987 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_TIME_VALUE_H_
+#define	_MACH_TIME_VALUE_H_
+
+#include <mach/machine/vm_types.h>
+
+/*
+ *	Time value returned by kernel.
+ */
+
+struct time_value {
+	integer_t	seconds;
+	integer_t	microseconds;
+};
+typedef	struct time_value	time_value_t;
+
+/*
+ *	Macros to manipulate time values.  Assume that time values
+ *	are normalized (microseconds <= 999999).
+ */
+#define	TIME_MICROS_MAX	(1000000)
+
+#define	time_value_add_usec(val, micros)	{	\
+	if (((val)->microseconds += (micros))		\
+		>= TIME_MICROS_MAX) {			\
+	    (val)->microseconds -= TIME_MICROS_MAX;	\
+	    (val)->seconds++;				\
+	}						\
+}
+
+#define	time_value_add(result, addend)		{		\
+	(result)->microseconds += (addend)->microseconds;	\
+	(result)->seconds += (addend)->seconds;			\
+	if ((result)->microseconds >= TIME_MICROS_MAX) {	\
+	    (result)->microseconds -= TIME_MICROS_MAX;		\
+	    (result)->seconds++;				\
+	}							\
+}
+
+/*
+ *	Time value available through the mapped-time interface.
+ *	Read this mapped value with
+ *		do {
+ *			secs = mtime->seconds;
+ *			usecs = mtime->microseconds;
+ *		} while (secs != mtime->check_seconds);
+ */
+
+typedef struct mapped_time_value {
+	integer_t seconds;
+	integer_t microseconds;
+	integer_t check_seconds;
+} mapped_time_value_t;
+
+#endif	/* _MACH_TIME_VALUE_H_ */