msdos/int1a.c

   1 /*
   2  * BIOS interrupt 1ah handler
   3  *
   4  * Copyright 1993 Erik Bos
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include <time.h>
  22 #include <sys/time.h>
  23 #include <stdlib.h>
  24 #include "options.h"
  25 #include "miscemu.h"
  26 #include "wine/debug.h"
  27
  28 WINE_DEFAULT_DEBUG_CHANNEL(int);
  29
  30 #define BCD_TO_BIN(x) ((x&15) + (x>>4)*10)
  31 #define BIN_TO_BCD(x) ((x%10) + ((x/10)<<4))
  32
  33
  34 /**********************************************************************
  35  *          INT1A_GetTicksSinceMidnight
  36  *
  37  * Return number of clock ticks since midnight.
  38  */
  39 DWORD INT1A_GetTicksSinceMidnight(void)
  40 {
  41     struct tm *bdtime;
  42     struct timeval tvs;
  43     time_t seconds;
  44
  45     /* This should give us the (approximately) correct
  46      * 18.206 clock ticks per second since midnight.
  47      */
  48     gettimeofday( &tvs, NULL );
  49     seconds = tvs.tv_sec;
  50     bdtime = localtime( &seconds );
  51     return (((bdtime->tm_hour * 3600 + bdtime->tm_min * 60 +
  52               bdtime->tm_sec) * 18206) / 1000) +
  53                   (tvs.tv_usec / 54927);
  54 }
  55
  56
  57 /**********************************************************************
  58  *          INT_Int1aHandler (WPROCS.126)
  59  *
  60  * Handler for int 1ah
  61  *     0x00 - 0x07 - date and time
  62  *     0x?? - 0x?? - Microsoft Real Time Compression Interface
  63  */
  64 void WINAPI INT_Int1aHandler( CONTEXT86 *context )
  65 {
  66     time_t ltime;
  67     DWORD ticks;
  68     struct tm *bdtime;
  69
  70     switch(AH_reg(context))
  71     {
  72         case 0x00:
  73             ticks = INT1A_GetTicksSinceMidnight();
  74             CX_reg(context) = HIWORD(ticks);
  75             DX_reg(context) = LOWORD(ticks);
  76             AX_reg(context) = 0;  /* No midnight rollover */
  77             TRACE("int1a: AH=00 -- ticks=%ld\n", ticks);
  78             break;
  79
  80         case 0x02:
  81                 ltime = time(NULL);
  82                 bdtime = localtime(&ltime);
  83
  84                 CX_reg(context) = (BIN_TO_BCD(bdtime->tm_hour)<<8) |
  85                                    BIN_TO_BCD(bdtime->tm_min);
  86                 DX_reg(context) = (BIN_TO_BCD(bdtime->tm_sec)<<8);
  87
  88         case 0x04:
  89                 ltime = time(NULL);
  90                 bdtime = localtime(&ltime);
  91                 CX_reg(context) = (BIN_TO_BCD(bdtime->tm_year/100)<<8) |
  92                                    BIN_TO_BCD((bdtime->tm_year-1900)%100);
  93                 DX_reg(context) = (BIN_TO_BCD(bdtime->tm_mon)<<8) |
  94                                    BIN_TO_BCD(bdtime->tm_mday);
  95                 break;
  96
  97                 /* setting the time,date or RTC is not allow -EB */
  98         case 0x01:
  99                 /* set system time */
 100         case 0x03:
 101                 /* set RTC time */
 102         case 0x05:
 103                 /* set RTC date */
 104         case 0x06:
 105                 /* set ALARM */
 106         case 0x07:
 107                 /* cancel ALARM */
 108                 break;
 109
 110         case 0xb0: /* Microsoft Real Time Compression */
 111                 switch AL_reg(context)
 112                 {
 113                     case 0x01:
 114                         /* not present */
 115                         break;
 116                     default:
 117                         INT_BARF(context, 0x1a);
 118                 }
 119                 break;
 120
 121         default:
 122                 INT_BARF( context, 0x1a );
 123     }
 124 }