usr.bin/doscmd/int1a.c

   1 /*
   2  * Copyright (c) 1992, 1993, 1996
   3  *      Berkeley Software Design, Inc.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by Berkeley Software
  16  *      Design, Inc.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY Berkeley Software Design, Inc. ``AS IS'' AND
  19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED.  IN NO EVENT SHALL Berkeley Software Design, Inc. BE LIABLE
  22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  28  * SUCH DAMAGE.
  29  *
  30  *      BSDI int1a.c,v 2.2 1996/04/08 19:32:49 bostic Exp
  31  *
  32  * $FreeBSD: src/usr.bin/doscmd/int1a.c,v 1.3.2.1 2002/04/25 11:04:51 tg Exp $
  33  * $DragonFly: src/usr.bin/doscmd/int1a.c,v 1.2 2003/06/17 04:29:26 dillon Exp $
  34  */
  35
  36 #include "doscmd.h"
  37
  38 static inline int
  39 to_BCD (int n)
  40 {
  41     n &= 0xFF;
  42     return n%10 + ((n/10)<<4);
  43 }
  44
  45 void
  46 int1a(regcontext_t *REGS)
  47 {
  48     struct      timeval tod;
  49     struct      timezone zone;
  50     struct      tm *tm;
  51     time_t      tv_sec;
  52     long        value;
  53     static long midnight = 0;
  54
  55     R_FLAGS &= ~PSL_C;
  56
  57     switch (R_AH) {
  58     case 0x00:
  59         gettimeofday(&tod, &zone);
  60
  61         if (midnight == 0) {
  62             tv_sec = boot_time.tv_sec;
  63             tm = localtime(&tv_sec);
  64             midnight = boot_time.tv_sec - (((tm->tm_hour * 60)
  65                                             + tm->tm_min) * 60
  66                                            + tm->tm_sec);
  67         }
  68
  69         R_AL = (tod.tv_sec - midnight) / (24 * 60 * 60);
  70
  71         if (R_AL) {
  72             tv_sec = boot_time.tv_sec;
  73             tm = localtime(&tv_sec);
  74             midnight = boot_time.tv_sec - (((tm->tm_hour * 60)
  75                                             + tm->tm_min) * 60
  76                                            + tm->tm_sec);
  77         }
  78
  79         tod.tv_sec -= midnight;
  80         tod.tv_usec -= boot_time.tv_usec;
  81
  82         value = (tod.tv_sec * 182 + tod.tv_usec / (1000000L/182)) / 10;
  83         R_CX = value >> 16;
  84         R_DX = value & 0xffff;
  85         break;
  86
  87     case 0x01:                          /* set current clock count */
  88         tv_sec = boot_time.tv_sec;
  89         tm = localtime(&tv_sec);
  90         midnight = boot_time.tv_sec - (((tm->tm_hour * 60)
  91             + tm->tm_min) * 60 + tm->tm_sec);
  92         break;
  93
  94     case 0x02:
  95         gettimeofday(&tod, &zone);
  96         tv_sec = tod.tv_sec;
  97         tm = localtime(&tv_sec);
  98         R_CH = to_BCD(tm->tm_hour);
  99         R_CL = to_BCD(tm->tm_min);
 100         R_DH = to_BCD(tm->tm_sec);
 101         break;
 102
 103     case 0x04:
 104         gettimeofday(&tod, &zone);
 105         tv_sec = tod.tv_sec;
 106         tm = localtime(&tv_sec);
 107         R_CH = to_BCD((tm->tm_year + 1900) / 100);
 108         R_CL = to_BCD((tm->tm_year + 1900) % 100);
 109         R_DH = to_BCD(tm->tm_mon + 1);
 110         R_DL = to_BCD(tm->tm_mday);
 111         break;
 112
 113     default:
 114         unknown_int2(0x1a, R_AH, REGS);
 115         break;
 116     }
 117 }