Xash3D FWGS engine.
 
 
 
 

117 lines
2.2 KiB

/*
sys_dos.c - dos timer
Copyright (C) 2020 mittorn
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 3 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.
*/
#include "platform/platform.h"
#include <dos.h>
void Platform_GetClipboardText( char *buffer, size_t size )
{
}
void Platform_SetClipboardText( const char *buffer, size_t size )
{
}
void *Platform_GetNativeObject( const char *name )
{
return NULL;
}
void Platform_Vibrate(float life, char flags)
{
}
void Platform_ShellExecute( const char *path, const char *parms )
{
}
volatile int ticks=0;
#if XASH_TIMER == TIMER_DOS
double Platform_DoubleTime( void )
{
return 0.005*ticks;
}
void Platform_Sleep( int msec )
{
//usleep( msec * 1000 );
}
#endif // XASH_TIMER == TIMER_DOS
#define PIT_FREQUENCY 0x1234DDL
#define frequency 140
#define counter PIT_FREQUENCY/frequency
volatile int BIOS_ticks=0;
volatile int second_ticks=0;
volatile int second_flag=0;
static void (__interrupt __far *orig_int_1c)();
static void (__interrupt __far *orig_int_09)();
static void __interrupt __far timerhandler()
{
BIOS_ticks += counter;
second_ticks++, ticks++;
if( BIOS_ticks >= 0x10000 )
{
BIOS_ticks = 0;
_chain_intr( orig_int_1c );
}
if( second_ticks>=frequency )
{
second_flag = 1;
second_ticks = 0;
}
outp( 0x20, 0x20 );
}
// in_dos.c
extern void __interrupt __far keyhandler( void );
void Platform_Init( void )
{
// save original vectors
orig_int_1c = _dos_getvect( 0x1c );
orig_int_09 = _dos_getvect( 0x09 );
_dos_setvect( 0x1c, timerhandler );
_dos_setvect( 0x09, keyhandler );
// set clock freq
outp( 0x43, 0x34 );
outp( 0x40, (char)(counter%256) );
outp( 0x40, (char)(counter/256) );
}
void Platform_Shutdown( void )
{
// restore freq
outp( 0x43, 0x34 );
outp( 0x40, 0 );
outp( 0x40, 0 );
//restore vectors
_dos_setvect( 0x1c, orig_int_1c );
_dos_setvect( 0x09, orig_int_09 );
}