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diff --git a/i386/pc/ipl.h b/i386/pc/ipl.h
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+/* 
+ * Mach Operating System
+ * Copyright (c) 1991,1990,1989 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.
+ */
+/*
+Copyright (c) 1988,1989 Prime Computer, Inc.  Natick, MA 01760
+All Rights Reserved.
+
+Permission to use, copy, modify, and distribute this
+software and its documentation for any purpose and
+without fee is hereby granted, provided that the above
+copyright notice appears in all copies and that both the
+copyright notice and this permission notice appear in
+supporting documentation, and that the name of Prime
+Computer, Inc. not be used in advertising or publicity
+pertaining to distribution of the software without
+specific, written prior permission.
+
+THIS SOFTWARE IS PROVIDED "AS IS", AND PRIME COMPUTER,
+INC. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
+SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  IN
+NO EVENT SHALL PRIME COMPUTER, INC.  BE LIABLE FOR ANY
+SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
+DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
+PROFITS, WHETHER IN ACTION OF CONTRACT, NEGLIGENCE, OR
+OTHER TORTIOUS ACTION, ARISING OUR OF OR IN CONNECTION
+WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+
+#define SPL0            0
+#define SPL1            1
+#define SPL2            2
+#define SPL3            3
+#define SPL4            4
+#define SPL5            5
+#define SPL6            6
+
+#define SPLPP           5
+#define SPLTTY          6
+#define SPLNI           6
+
+#define IPLHI           8
+#define SPL7            IPLHI
+#define SPLHI           IPLHI
+
+#ifndef	ASSEMBLER
+extern int		(*ivect[])();
+extern int		iunit[];
+extern unsigned char	intpri[];
+#endif	ASSEMBLER
+