mirror of https://github.com/FWGS/xash3d-fwgs
118 lines
2.2 KiB
C
118 lines
2.2 KiB
C
/*
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sys_dos.c - dos timer
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Copyright (C) 2020 mittorn
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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*/
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#include "platform/platform.h"
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#include <dos.h>
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void Platform_GetClipboardText( char *buffer, size_t size )
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{
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}
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void Platform_SetClipboardText( const char *buffer, size_t size )
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{
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}
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void *Platform_GetNativeObject( const char *name )
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{
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return NULL;
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}
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void Platform_Vibrate(float life, char flags)
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{
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}
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void Platform_ShellExecute( const char *path, const char *parms )
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{
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}
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volatile int ticks=0;
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#if XASH_TIMER == TIMER_DOS
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double Platform_DoubleTime( void )
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{
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return 0.005*ticks;
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}
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void Platform_Sleep( int msec )
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{
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//usleep( msec * 1000 );
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}
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#endif // XASH_TIMER == TIMER_DOS
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#define PIT_FREQUENCY 0x1234DDL
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#define frequency 140
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#define counter PIT_FREQUENCY/frequency
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volatile int BIOS_ticks=0;
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volatile int second_ticks=0;
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volatile int second_flag=0;
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static void (__interrupt __far *orig_int_1c)();
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static void (__interrupt __far *orig_int_09)();
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static void __interrupt __far timerhandler()
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{
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BIOS_ticks += counter;
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second_ticks++, ticks++;
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if( BIOS_ticks >= 0x10000 )
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{
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BIOS_ticks = 0;
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_chain_intr( orig_int_1c );
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}
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if( second_ticks>=frequency )
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{
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second_flag = 1;
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second_ticks = 0;
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}
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outp( 0x20, 0x20 );
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}
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// in_dos.c
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extern void __interrupt __far keyhandler( void );
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void Platform_Init( void )
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{
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// save original vectors
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orig_int_1c = _dos_getvect( 0x1c );
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orig_int_09 = _dos_getvect( 0x09 );
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_dos_setvect( 0x1c, timerhandler );
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_dos_setvect( 0x09, keyhandler );
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// set clock freq
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outp( 0x43, 0x34 );
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outp( 0x40, (char)(counter%256) );
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outp( 0x40, (char)(counter/256) );
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}
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void Platform_Shutdown( void )
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{
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// restore freq
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outp( 0x43, 0x34 );
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outp( 0x40, 0 );
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outp( 0x40, 0 );
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//restore vectors
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_dos_setvect( 0x1c, orig_int_1c );
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_dos_setvect( 0x09, orig_int_09 );
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}
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