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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*/