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diff --git a/chips/screen_switch.h b/chips/screen_switch.h
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-/*
- * Mach Operating System
- * Copyright (c) 1991,1990,1989 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.
- */
-/*
- * File: screen_switch.h
- * Author: Alessandro Forin, Carnegie Mellon University
- * Date: 10/90
- *
- * Definitions of things that must be tailored to
- * specific hardware boards for the Generic Screen Driver.
- */
-
-#ifndef SCREEN_SWITCH_H
-#define SCREEN_SWITCH_H 1
-
-/*
- * List of probe routines, scanned at cold-boot time
- * to see which, if any, graphic display is available.
- * This is done before autoconf, so that printing on
- * the console works early on. The alloc routine is
- * called only on the first device that answers.
- * Ditto for the setup routine, called later on.
- */
-struct screen_probe_vector {
- int (*probe)();
- unsigned int (*alloc)();
- int (*setup)();
-};
-
-/*
- * Low-level operations on the graphic device, used
- * by the otherwise device-independent interface code
- */
-struct screen_switch {
- int (*graphic_open)(); /* when X11 opens */
- int (*graphic_close)(); /* .. or closes */
- int (*set_status)(); /* dev-specific ops */
- int (*get_status)(); /* dev-specific ops */
- int (*char_paint)(); /* blitc */
- int (*pos_cursor)(); /* cursor positioning */
- int (*insert_line)(); /* ..and scroll down */
- int (*remove_line)(); /* ..and scroll up */
- int (*clear_bitmap)(); /* blank screen */
- int (*video_on)(); /* screen saver */
- int (*video_off)();
- int (*intr_enable)();
- int (*map_page)(); /* user-space mapping */
-};
-
-/*
- * Each graphic device needs page-aligned memory
- * to be mapped in user space later (for events
- * and such). Size and content of this memory
- * is unfortunately device-dependent, even if
- * it did not need to (puns).
- */
-extern char *screen_data;
-
-extern struct screen_probe_vector screen_probe_vector[];
-
-extern int screen_noop(), screen_find();
-
-#endif SCREEN_SWITCH_H