Sweden-Number/msdos/int1a.c

109 lines
2.7 KiB
C

/*
* BIOS interrupt 1ah handler
*/
#include <time.h>
#include <sys/time.h>
#include <stdlib.h>
#include "options.h"
#include "miscemu.h"
#include "debugtools.h"
DEFAULT_DEBUG_CHANNEL(int)
#define BCD_TO_BIN(x) ((x&15) + (x>>4)*10)
#define BIN_TO_BCD(x) ((x%10) + ((x/10)<<4))
/**********************************************************************
* INT1A_GetTicksSinceMidnight
*
* Return number of clock ticks since midnight.
*/
DWORD INT1A_GetTicksSinceMidnight(void)
{
struct tm *bdtime;
struct timeval tvs;
time_t seconds;
/* This should give us the (approximately) correct
* 18.206 clock ticks per second since midnight.
*/
gettimeofday( &tvs, NULL );
seconds = tvs.tv_sec;
bdtime = localtime( &seconds );
return (((bdtime->tm_hour * 3600 + bdtime->tm_min * 60 +
bdtime->tm_sec) * 18206) / 1000) +
(tvs.tv_usec / 54927);
}
/**********************************************************************
* INT_Int1aHandler
*
* Handler for int 1ah
* 0x00 - 0x07 - date and time
* 0x?? - 0x?? - Microsoft Real Time Compression Interface
*/
void WINAPI INT_Int1aHandler( CONTEXT86 *context )
{
time_t ltime;
DWORD ticks;
struct tm *bdtime;
switch(AH_reg(context))
{
case 0x00:
ticks = INT1A_GetTicksSinceMidnight();
CX_reg(context) = HIWORD(ticks);
DX_reg(context) = LOWORD(ticks);
AX_reg(context) = 0; /* No midnight rollover */
TRACE("int1a: AH=00 -- ticks=%ld\n", ticks);
break;
case 0x02:
ltime = time(NULL);
bdtime = localtime(&ltime);
CX_reg(context) = (BIN_TO_BCD(bdtime->tm_hour)<<8) |
BIN_TO_BCD(bdtime->tm_min);
DX_reg(context) = (BIN_TO_BCD(bdtime->tm_sec)<<8);
case 0x04:
ltime = time(NULL);
bdtime = localtime(&ltime);
CX_reg(context) = (BIN_TO_BCD(bdtime->tm_year/100)<<8) |
BIN_TO_BCD((bdtime->tm_year-1900)%100);
DX_reg(context) = (BIN_TO_BCD(bdtime->tm_mon)<<8) |
BIN_TO_BCD(bdtime->tm_mday);
break;
/* setting the time,date or RTC is not allow -EB */
case 0x01:
/* set system time */
case 0x03:
/* set RTC time */
case 0x05:
/* set RTC date */
case 0x06:
/* set ALARM */
case 0x07:
/* cancel ALARM */
break;
case 0xb0: /* Microsoft Real Time Compression */
switch AL_reg(context)
{
case 0x01:
/* not present */
break;
default:
INT_BARF(context, 0x1a);
}
break;
default:
INT_BARF( context, 0x1a );
}
}