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/* SVGATextMode -- An SVGA textmode manipulation/enhancement tool
*
* Copyright (C) 1995-1998 Koen Gadeyne
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/***
*** set80: sets your VGA card back to 80x25. Useful in case SVGATextMode screws up.
*** it will also resize the VT's (when the kernel supports it), but only the first 16 active ones
*** Any "special" features that need a TextConfig file are not implemented.
*** It is intended to run completely stand-alone.
***
*** Does NOT work for all cards. Those that use EXTENSION bits in addition to the two
*** "standard" VGA ones for clock selection, instead if a completely different set of bits
*** (and then using clock index 2 or 3 to point the VGA chip to the "other" clock selection method)
*** will probably NOT switch back to the correct clock...
*** ATI chips are an example of this.
***/
/* #define USE_SVGALIB */
/* if "-a" option defined, use register dump instead of specific register
programming. A register dump is "safer" because it restores ALL standard
VGA registers to a known state, so there is more chance of getting a good
textmode back from it. A specific register programming method changes
only those registers that need to be changed, and thus less chance of
changing something that should not be changed...
*/
#ifdef DOS
# define NO_RESIZE
#endif
#include "misc.h"
#include "ttyresize.h"
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#ifndef DOS
# include <sys/ioctl.h>
# include <sys/kd.h>
#endif
#include "vga_prg.h"
#include "unlock_svga.h"
#include "setclock.h"
#include "std_clock.h"
#include "messages.h"
#include "kversion.h"
#include "file_ops.h"
#include "cfg_data.h"
#ifdef USE_SVGALIB
#include <vga.h>
#endif
#define SET_CLOCKBITS_0_1(no) ( outb(( inb(VGA_MISC_R) & 0xf3) | (((no) << 2) & 0x0C) , VGA_MISC_W) ) /* bits 0 and 1 of clock no */
/*
* This mode line will be programmed. It is not used by set80, it's just informational
*/
#define MODELINE "80x25x9" 28.3 640 680 776 800 400 412 414 449 font 9x16
/*
* global variables
*/
char *CommandName;
bool debug_messages=FALSE;
int STM_Options=0; /* just to keep the compiler happy */
void usage()
{
PMESSAGE(("version %s. (c) 1995,1996,1997 Koen Gadeyne.\n"\
"\n"\
" Resets and resizes the console to a standard VGA 80x25 text mode\n"\
" It is completely stand-alone (does not call other programs, no config file).\n"\
" This does _not_ restore the font itself. `setfont' is appropriate for that.\n"\
"\n"\
" Options: -d print debugging messages\n"\
" -h prints usage information\n"\
" -a use alternate method: restore ALL standard VGA registers.\n"\
"\n",
VERSION, CommandName));
}
/****************************************************************************************************************************/
int main (int argc, char* argv[])
{
int c;
bool restore_all_regs=FALSE;
CommandName = argv[0];
while ((c = getopt (argc, argv, "hda")) != EOF)
switch (c)
{
case 'd': debug_messages=TRUE;
break;
case 'a': restore_all_regs=TRUE;
break;
case 'h': usage();
exit(0);
break;
case '?': usage();
PERROR(("Bad option '-%c'\n",(char)optopt));
exit(-1);
break;
default: PERROR(("getopt returned unknown token '%c'.\n",c));
}
PVERSION;
#ifndef DOS
# ifdef NO_RESIZE
if (check_if_resize(80, 25))
PWARNING(("Screen resizing was not compiled in (NO_RESIZE defined when compiling).\n\
Your screen will be garbled, but hopefully useful...\n"));
# else
/* we don't check if resizing is necessary: just do it ALWAYS. You never know */
if (!check_kernel_version(1,1,54, "Virtual Terminal resizing"))
PWARNING(("Screen resizing not supported by this kernel version.\n\
Your screen will be garbled, but hopefully useful...\n"));
else
{
do_VT_RESIZE(80, 25, TRUE); /* always allow going via a 1x1 screen. This is a resque program */
resize_active_vts(80, 25);
}
# endif
#else
resize_DOS(80, 25);
#endif
#ifndef USE_SVGALIB
get_VGA_io_perm(CS_VGA);
outb(0x00, 0x3CC);
outb(0x01, 0x3CA);
UNLOCK_STD_VGA;
Set_Textmode(restore_all_regs);
if (!restore_all_regs)
{
Set_MAX_SCANLINE (16);
set_V_timings(400, 412, 414, 449);
set_H_timings(640, 680, 776, 800);
Set_CURSOR_START(16-2) ; Set_CURSOR_END(16-1);
Set_HSYNC_POLARITY(NEG) ; Set_VSYNC_POLARITY(POS);
set_charwidth(9);
SET_CLOCKBITS_0_1(1); /* select standard VGA 28 MHZ clock */
usleep(50000);
SCREEN_ON;
}
#ifndef DOS
ioctl(opentty( ConsoleDevice("0") ), KDSETMODE, KD_TEXT);
#endif
#else
vga_setmode(TEXT);
#endif
return(0);
}
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