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diff --git a/kern/pc_sample.h b/kern/pc_sample.h
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+/* 
+ * Mach Operating System
+ * Copyright (c) 1993 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.
+ */
+/*
+ * HISTORY
+ * $Log: pc_sample.h,v $
+ * Revision 1.1.1.1  1996/10/30 01:38:13  thomas
+ * Imported from UK22
+ *
+ * Revision 1.1  1994/11/02  02:24:15  law
+ * Initial revision
+ *
+ * Revision 2.2  93/11/17  19:06:01  dbg
+ * 	Moved kernel internal definitions here from mach/pc_sample.h.
+ * 	[93/09/24            dbg]
+ * 
+ */
+
+/*
+ *	Kernel definitions for PC sampling.
+ */
+#ifndef	_KERN_PC_SAMPLE_H_
+#define	_KERN_PC_SAMPLE_H_
+
+#include <mach/pc_sample.h>
+#include <mach/machine/vm_types.h>
+#include <kern/kern_types.h>
+#include <kern/macro_help.h>
+
+/*
+ *	Control structure for sampling, included in
+ *	threads and tasks.  If sampletypes is 0, no
+ *	sampling is done.
+ */
+
+struct sample_control {
+    vm_offset_t		buffer;
+    unsigned int	seqno;
+    sampled_pc_flavor_t sampletypes;
+};
+
+typedef struct sample_control	sample_control_t;
+
+/*
+ *	Routines to take PC samples.
+ */
+extern void take_pc_sample(
+	thread_t	thread,
+	sample_control_t *cp,
+	sampled_pc_flavor_t flavor);
+
+/*
+ *	Macro to do quick flavor check for sampling,
+ *	on both threads and tasks.
+ */
+#define	take_pc_sample_macro(thread, flavor) \
+    MACRO_BEGIN \
+	task_t	task; \
+ \
+	if ((thread)->pc_sample.sampletypes & (flavor)) \
+	    take_pc_sample((thread), &(thread)->pc_sample, (flavor)); \
+ \
+	task = (thread)->task; \
+	if (task->pc_sample.sampletypes & (flavor)) \
+	    take_pc_sample((thread), &task->pc_sample, (flavor)); \
+    MACRO_END
+
+#endif	/* _KERN_PC_SAMPLE_H_ */