/*
* linux/drivers/video/vgacon.c -- Low level VGA based console driver
*
* Created 28 Sep 1997 by Geert Uytterhoeven
*
* Rewritten by Martin Mares <mj@ucw.cz>, July 1998
*
* This file is based on the old console.c, vga.c and vesa_blank.c drivers.
*
* Copyright (C) 1991, 1992 Linus Torvalds
* 1995 Jay Estabrook
*
* User definable mapping table and font loading by Eugene G. Crosser,
* <crosser@average.org>
*
* Improved loadable font/UTF-8 support by H. Peter Anvin
* Feb-Sep 1995 <peter.anvin@linux.org>
*
* Colour palette handling, by Simon Tatham
* 17-Jun-95 <sgt20@cam.ac.uk>
*
* if 512 char mode is already enabled don't re-enable it,
* because it causes screen to flicker, by Mitja Horvat
* 5-May-96 <mitja.horvat@guest.arnes.si>
*
* Use 2 outw instead of 4 outb_p to reduce erroneous text
* flashing on RHS of screen during heavy console scrolling .
* Oct 1996, Paul Gortmaker.
*
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive for
* more details.
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/tty.h>
#include <linux/console.h>
#include <linux/string.h>
#include <linux/kd.h>
#include <linux/slab.h>
#include <linux/vt_kern.h>
#include <linux/selection.h>
#include <linux/spinlock.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/smp_lock.h>
#include <video/vga.h>
#include <asm/io.h>
static DEFINE_SPINLOCK(vga_lock);
static int cursor_size_lastfrom;
static int cursor_size_lastto;
static u32 vgacon_xres;
static u32 vgacon_yres;
static struct vgastate state;
#define BLANK 0x0020
#define CAN_LOAD_EGA_FONTS /* undefine if the user must not do this */
#define CAN_LOAD_PALETTE /* undefine if the user must not do this */
/* You really do _NOT_ want to define this, unless you have buggy
* Trident VGA which will resize cursor when moving it between column
* 15 & 16. If you define this and your VGA is OK, inverse bug will
* appear.
*/
#undef TRIDENT_GLITCH
#define VGA_FONTWIDTH 8 /* VGA does not support fontwidths != 8 */
/*
* Interface used by the world
*/
static const char *vgacon_startup(void);
static void vgacon_init(struct vc_data *c, int init);
static void vgacon_deinit(struct vc_data *c);
static void vgacon_cursor(struct vc_data *c, int mode);
static int vgacon_switch(struct vc_data *c);
static int vgacon_blank(struct vc_data *c, int blank, int mo
