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diff --git a/i386/include/mach/i386/mach_i386_types.h b/i386/include/mach/i386/mach_i386_types.h
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+/*
+ * Mach Operating System
+ * Copyright (c) 1991 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.
+ */
+/*
+ * Type definitions for i386 interface routines.
+ */
+
+#ifndef _MACH_MACH_I386_TYPES_H_
+#define _MACH_MACH_I386_TYPES_H_
+
+/*
+ * Array of devices.
+ */
+typedef device_t *device_list_t;
+
+/*
+ * i386 segment descriptor.
+ */
+struct descriptor {
+ unsigned int low_word;
+ unsigned int high_word;
+};
+
+typedef struct descriptor descriptor_t;
+typedef struct descriptor *descriptor_list_t;
+
+#endif /* _MACH_MACH_I386_TYPES_H_ */