You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
110 lines
2.1 KiB
110 lines
2.1 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_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 DOS_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 DOS_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 ); |
|
}
|
|
|