Initial source

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diff --git a/i386/pc/real.h b/i386/pc/real.h
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+/* 
+ * Copyright (c) 1995-1994 The University of Utah and
+ * the Computer Systems Laboratory at the University of Utah (CSL).
+ * All rights reserved.
+ *
+ * Permission to use, copy, modify and distribute this software is hereby
+ * granted provided that (1) source code retains these copyright, permission,
+ * and disclaimer notices, and (2) redistributions including binaries
+ * reproduce the notices in supporting documentation, and (3) all advertising
+ * materials mentioning features or use of this software display the following
+ * acknowledgement: ``This product includes software developed by the
+ * Computer Systems Laboratory at the University of Utah.''
+ *
+ * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
+ * IS" CONDITION.  THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
+ * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ *
+ * CSL requests users of this software to return to csl-dist@cs.utah.edu any
+ * improvements that they make and grant CSL redistribution rights.
+ *
+ *      Author: Bryan Ford, University of Utah CSL
+ */
+#ifndef _I386_PC_REAL_CALL_H_
+#define _I386_PC_REAL_CALL_H_
+
+/* This structure happens to correspond to the DPMI real-call structure.  */
+struct real_call_data
+{
+	unsigned edi;
+	unsigned esi;
+	unsigned ebp;
+	unsigned reserved;
+	unsigned ebx;
+	unsigned edx;
+	unsigned ecx;
+	unsigned eax;
+	unsigned short flags;
+	unsigned short es;
+	unsigned short ds;
+	unsigned short fs;
+	unsigned short gs;
+	unsigned short ip;
+	unsigned short cs;
+	unsigned short sp;
+	unsigned short ss;
+};
+
+/* Code segment we originally had when we started in real mode.  */
+extern unsigned short real_cs;
+
+extern void (*real_int)(int intnum, struct real_call_data *rcd);
+extern void (*real_exit)(int rc);
+
+#define real_call_data_init(rcd)	\
+	({ (rcd)->flags = 0;		\
+	   (rcd)->ss = 0;		\
+	   (rcd)->sp = 0;		\
+	})
+
+#endif /* _I386_PC_REAL_CALL_H_ */