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