bfb40c4b1c
reads the BIOS (CMOS RTC) date (at boot). Note that according to RBIL, DRDOS would even hook int 1a ah=4 to force a correct year. /* A BIOS with y2k (year 2000) bug will always report year 19nn */ if ((dosregs.c.x >= 1900) && (dosregs.c.x < 1980)) dosregs.c.x += 100; git-svn-id: https://svn.code.sf.net/p/freedos/svn/kernel/trunk@1359 6ac86273-5f31-0410-b378-82cca8765d1b
75 lines
3.3 KiB
C
75 lines
3.3 KiB
C
/****************************************************************/
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/* */
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/* initclk.c */
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/* */
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/* System Clock Driver - initialization */
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/* */
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/* Copyright (c) 1995 */
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/* Pasquale J. Villani */
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/* All Rights Reserved */
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/* */
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/* This file is part of DOS-C. */
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/* */
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/* DOS-C is free software; you can redistribute it and/or */
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/* modify it under the terms of the GNU General Public License */
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/* as published by the Free Software Foundation; either version */
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/* 2, or (at your option) any later version. */
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/* */
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/* DOS-C is distributed in the hope that it will be useful, but */
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/* WITHOUT ANY WARRANTY; without even the implied warranty of */
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/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See */
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/* the GNU General Public License for more details. */
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/* */
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/* You should have received a copy of the GNU General Public */
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/* License along with DOS-C; see the file COPYING. If not, */
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/* write to the Free Software Foundation, 675 Mass Ave, */
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/* Cambridge, MA 02139, USA. */
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/****************************************************************/
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#include "portab.h"
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#include "init-mod.h"
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#ifdef VERSION_STRINGS
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static char *RcsId =
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"$Id$";
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#endif
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/* */
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/* WARNING - THIS DRIVER IS NON-PORTABLE!!!! */
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/* */
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STATIC int InitBcdToByte(int x)
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{
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return ((x >> 4) & 0xf) * 10 + (x & 0xf);
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}
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void Init_clk_driver(void)
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{
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static iregs regsT = {0x200}; /* ah=0x02 */
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static iregs regsD = {0x400, 0, 0x1400, 0x101};
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/* ah=4, ch=20^ ^cl=0, ^dh=dl=1 (2000/1/1)
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* (above date will be set on error) */
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iregs dosregs;
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init_call_intr(0x1a, ®sT); /* get BIOS time */
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init_call_intr(0x1a, ®sD); /* get BIOS date */
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/* DosSetDate */
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dosregs.a.b.h = 0x2b;
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dosregs.c.x = 100 * InitBcdToByte(regsD.c.b.h) /* century */
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+ InitBcdToByte(regsD.c.b.l);/* year */
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/* A BIOS with y2k (year 2000) bug will always report year 19nn */
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if ((dosregs.c.x >= 1900) && (dosregs.c.x < 1980)) dosregs.c.x += 100;
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dosregs.d.b.h = InitBcdToByte(regsD.d.b.h); /* month */
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dosregs.d.b.l = InitBcdToByte(regsD.d.b.l); /* day */
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init_call_intr(0x21, &dosregs);
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/* DosSetTime */
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dosregs.a.b.h = 0x2d;
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dosregs.c.b.l = InitBcdToByte(regsT.c.b.l); /* minutes */
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dosregs.c.b.h = InitBcdToByte(regsT.c.b.h); /* hours */
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dosregs.d.b.h = InitBcdToByte(regsT.d.b.h); /*seconds */
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dosregs.d.b.l = 0;
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init_call_intr(0x21, &dosregs);
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}
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