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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
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