117 lines
2.2 KiB
117 lines
2.2 KiB
/* |
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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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