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 "config.h"
  22 #include "wine/port.h"
  23
  24 #include <time.h>
  25 #ifdef HAVE_SYS_TIME_H
  26 # include <sys/time.h>
  27 #endif
  28 #include <stdlib.h>
  29 #include "miscemu.h"
  30 #include "wine/debug.h"
  31
  32 WINE_DEFAULT_DEBUG_CHANNEL(int);
  33
  34 #define BCD_TO_BIN(x) ((x&15) + (x>>4)*10)
  35 #define BIN_TO_BCD(x) ((x%10) + ((x/10)<<4))
  36
  37
  38 /**********************************************************************
  39  *          INT1A_GetTicksSinceMidnight
  40  *
  41  * Return number of clock ticks since midnight.
  42  */
  43 DWORD INT1A_GetTicksSinceMidnight(void)
  44 {
  45     struct tm *bdtime;
  46     struct timeval tvs;
  47     time_t seconds;
  48
  49     /* This should give us the (approximately) correct
  50      * 18.206 clock ticks per second since midnight.
  51      */
  52     gettimeofday( &tvs, NULL );
  53     seconds = tvs.tv_sec;
  54     bdtime = localtime( &seconds );
  55     return (((bdtime->tm_hour * 3600 + bdtime->tm_min * 60 +
  56               bdtime->tm_sec) * 18206) / 1000) +
  57                   (tvs.tv_usec / 54927);
  58 }
  59
  60
  61 /**********************************************************************
  62  *          INT_Int1aHandler (WPROCS.126)
  63  *
  64  * Handler for int 1ah
  65  *     0x00 - 0x07 - date and time
  66  *     0x?? - 0x?? - Microsoft Real Time Compression Interface
  67  */
  68 void WINAPI INT_Int1aHandler( CONTEXT86 *context )
  69 {
  70     time_t ltime;
  71     DWORD ticks;
  72     struct tm *bdtime;
  73
  74     switch(AH_reg(context))
  75     {
  76         case 0x00:
  77             ticks = INT1A_GetTicksSinceMidnight();
  78             SET_CX( context, HIWORD(ticks) );
  79             SET_DX( context, LOWORD(ticks) );
  80             SET_AX( context, 0 );  /* No midnight rollover */
  81             TRACE("int1a: AH=00 -- ticks=%ld\n", ticks);
  82             break;
  83
  84         case 0x02:
  85                 ltime = time(NULL);
  86                 bdtime = localtime(&ltime);
  87
  88                 SET_CX( context, (BIN_TO_BCD(bdtime->tm_hour)<<8) |
  89                                   BIN_TO_BCD(bdtime->tm_min) );
  90                 SET_DX( context, (BIN_TO_BCD(bdtime->tm_sec)<<8) );
  91
  92         case 0x04:
  93                 ltime = time(NULL);
  94                 bdtime = localtime(&ltime);
  95                 SET_CX( context, (BIN_TO_BCD(bdtime->tm_year/100)<<8) |
  96                                   BIN_TO_BCD((bdtime->tm_year-1900)%100) );
  97                 SET_DX( context, (BIN_TO_BCD(bdtime->tm_mon)<<8) |
  98                                   BIN_TO_BCD(bdtime->tm_mday) );
  99                 break;
 100
 101                 /* setting the time,date or RTC is not allow -EB */
 102         case 0x01:
 103                 /* set system time */
 104         case 0x03:
 105                 /* set RTC time */
 106         case 0x05:
 107                 /* set RTC date */
 108         case 0x06:
 109                 /* set ALARM */
 110         case 0x07:
 111                 /* cancel ALARM */
 112                 break;
 113
 114         case 0xb0: /* Microsoft Real Time Compression */
 115                 switch AL_reg(context)
 116                 {
 117                     case 0x01:
 118                         /* not present */
 119                         break;
 120                     default:
 121                         INT_BARF(context, 0x1a);
 122                 }
 123                 break;
 124
 125         default:
 126                 INT_BARF( context, 0x1a );
 127     }
 128 }