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diff --git a/ddb/db_variables.h b/ddb/db_variables.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.
+ */
+/*
+ * 	Author: David B. Golub, Carnegie Mellon University
+ *	Date:	7/90
+ */
+
+#ifndef	_DB_VARIABLES_H_
+#define	_DB_VARIABLES_H_
+
+#include <kern/thread.h>
+
+/*
+ * Debugger variables.
+ */
+struct db_variable {
+	char	*name;		/* Name of variable */
+	db_expr_t *valuep;	/* pointer to value of variable */
+				/* function to call when reading/writing */
+	int	(*fcn)(/* db_variable, db_expr_t, int, db_var_aux_param_t */);
+	short	min_level;	/* number of minimum suffix levels */
+	short	max_level;	/* number of maximum suffix levels */
+	short	low;		/* low value of level 1 suffix */
+	short	high;		/* high value of level 1 suffix */
+#define DB_VAR_GET	0
+#define DB_VAR_SET	1
+};
+#define	FCN_NULL	((int (*)())0)
+
+#define DB_VAR_LEVEL	3	/* maximum number of suffix level */
+
+#define db_read_variable(vp, valuep)	\
+	db_read_write_variable(vp, valuep, DB_VAR_GET, 0)
+#define db_write_variable(vp, valuep)	\
+	db_read_write_variable(vp, valuep, DB_VAR_SET, 0)
+
+/*
+ * auxiliary parameters passed to a variable handler
+ */
+struct db_var_aux_param {
+	char		*modif;			/* option strings */
+	short		level;			/* number of levels */
+	short		suffix[DB_VAR_LEVEL];	/* suffix */
+	thread_t	thread;			/* target task */
+};
+
+typedef struct db_var_aux_param	*db_var_aux_param_t;
+	
+
+extern struct db_variable	db_vars[];	/* debugger variables */
+extern struct db_variable	*db_evars;
+extern struct db_variable	db_regs[];	/* machine registers */
+extern struct db_variable	*db_eregs;
+
+#endif	/* _DB_VARIABLES_H_ */