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diff --git a/include/mach/pc_sample.h b/include/mach/pc_sample.h
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+/* 
+ * Mach Operating System
+ * Copyright (c) 1993,1992 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_PC_SAMPLE_H_
+#define _MACH_PC_SAMPLE_H_
+
+#include <mach/machine/vm_types.h>
+
+typedef natural_t	sampled_pc_flavor_t;
+
+
+#define SAMPLED_PC_PERIODIC			0x1	/* default */
+
+
+#define SAMPLED_PC_VM_ZFILL_FAULTS		0x10
+#define SAMPLED_PC_VM_REACTIVATION_FAULTS	0x20
+#define SAMPLED_PC_VM_PAGEIN_FAULTS		0x40
+#define SAMPLED_PC_VM_COW_FAULTS		0x80
+#define SAMPLED_PC_VM_FAULTS_ANY		0x100
+#define SAMPLED_PC_VM_FAULTS		\
+			(SAMPLED_PC_VM_ZFILL_FAULTS | \
+			 SAMPLED_PC_VM_REACTIVATION_FAULTS |\
+			 SAMPLED_PC_VM_PAGEIN_FAULTS |\
+			 SAMPLED_PC_VM_COW_FAULTS )
+
+
+
+
+/*
+ *	Definitions for the PC sampling interface.
+ */
+
+typedef struct sampled_pc {
+    natural_t		id;
+    vm_offset_t		pc;
+    sampled_pc_flavor_t sampletype;
+} sampled_pc_t;
+
+typedef sampled_pc_t *sampled_pc_array_t;
+typedef unsigned int sampled_pc_seqno_t;
+
+
+#endif	/* _MACH_PC_SAMPLE_H_ */