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diff --git a/i386/imps/cpu_number.h b/i386/imps/cpu_number.h
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+/* 
+ * Copyright (c) 1994 The University of Utah and
+ * the Computer Systems Laboratory at the University of Utah (CSL).
+ * All rights reserved.
+ *
+ * Permission to use, copy, modify and distribute this software is hereby
+ * granted provided that (1) source code retains these copyright, permission,
+ * and disclaimer notices, and (2) redistributions including binaries
+ * reproduce the notices in supporting documentation, and (3) all advertising
+ * materials mentioning features or use of this software display the following
+ * acknowledgement: ``This product includes software developed by the
+ * Computer Systems Laboratory at the University of Utah.''
+ *
+ * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
+ * IS" CONDITION.  THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
+ * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ *
+ * CSL requests users of this software to return to csl-dist@cs.utah.edu any
+ * improvements that they make and grant CSL redistribution rights.
+ *
+ *      Author: Bryan Ford, University of Utah CSL
+ */
+#ifndef _IMPS_CPU_NUMBER_
+#define _IMPS_CPU_NUMBER_
+
+
+#ifndef ASSEMBLER
+
+#include "apic.h"
+
+static inline int
+cpu_number()
+{
+	return apic_local_unit.unit_id.r >> 24;
+}
+
+#else ASSEMBLER
+
+#include "impsasm.h"
+
+#define	CPU_NUMBER(reg)		\
+	movzbl	APIC_LOCAL_VA+APIC_LOCAL_UNIT_ID+3,reg
+
+#endif ASSEMBLER
+
+
+#include "i386/cpu_number.h"
+
+
+#endif _IMPS_CPU_NUMBER_