Initial source

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diff --git a/scsi/rz.h b/scsi/rz.h
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+/* 
+ * Mach Operating System
+ * Copyright (c) 1991,1990 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.
+ */
+/*
+ *	File: rz.h
+ * 	Author: Alessandro Forin, Carnegie Mellon University
+ *	Date:	9/90
+ *
+ *	Mapping between U*x-like indexing and controller+slave
+ *	Each controller handles at most 8 slaves, few controllers.
+ */
+
+#if 0
+#define	rzcontroller(dev)	(((dev)>>6)&0x3)
+#define	rzslave(dev)		(((dev)>>3)&0x7)
+#endif 0
+#define	rzcontroller(dev)	(((dev)>>13)&0x3)
+#define rzslave(dev)		(((dev)>>10)&0x7)
+
+#if 0
+#define	rzpartition(dev)	((PARTITION_TYPE(dev)==0xf)?MAXPARTITIONS:((dev)&0x7))
+#endif 0
+#define rzpartition(dev)	((dev)&0x3ff)
+
+/* To address the full 256 luns use upper bits 8..12 */
+/* NOTE: Under U*x this means the next major up.. what a mess */
+#define rzlun(dev)		(((dev)&0x7) | (((dev)>>5)&0xf8))
+
+/* note: whatever this was used for is no longer cared about -- Kevin */
+#define PARTITION_TYPE(dev)	(((dev)>>24)&0xf)
+#define PARTITION_ABSOLUTE	(0xf<<24)
+
+#ifdef	MACH_KERNEL
+#else	/*MACH_KERNEL*/
+#define tape_unit(dev)		((((dev)&0xe0)>>3)|((dev)&0x3))
+#define	TAPE_UNIT(dev)		((dev)&(~0xff))|(tape_unit((dev))<<3)
+#define	TAPE_REWINDS(dev)	(((dev)&0x1c)==0)||(((dev)&0x1c)==8)
+#endif	/*MACH_KERNEL*/