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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.
+ */
+/*
+ *	Author: David B. Golub, Carnegie Mellon University
+ *	Date: 	7/90
+ */
+
+#ifndef	_DEVICE_PARAM_H_
+#define	_DEVICE_PARAM_H_
+
+/*
+ * Compatibility definitions for disk IO.
+ */
+
+/*
+ * Disk devices do all IO in 512-byte blocks.
+ */
+#define	DEV_BSIZE	512
+
+/*
+ * Conversion between bytes and disk blocks.
+ */
+#define	btodb(byte_offset)	((byte_offset) >> 9)
+#define	dbtob(block_number)	((block_number) << 9)
+
+#endif	/* _DEVICE_PARAM_H_ */