Initial source

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diff --git a/i386/i386at/dev_hdr.h b/i386/i386at/dev_hdr.h
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+/*
+ * Mach device definitions (i386at version).
+ *
+ * Copyright (c) 1996 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: Shantanu Goel, University of Utah CSL
+ */
+
+#ifndef _I386AT_DEV_HDR_H_
+#define _I386AT_DEV_HDR_H_
+
+struct device_emulation_ops;
+
+/* This structure is associated with each open device port.
+   The port representing the device points to this structure.  */
+struct device
+{
+  struct device_emulation_ops *emul_ops;
+  void *emul_data;
+};
+
+typedef struct device *device_t;
+
+#define DEVICE_NULL	((device_t) 0)
+
+#endif /* _I386AT_DEV_HDR_H_ */