time.c

一个微型操作系统源码

/*
 *  LittleOS
 *  Copyright (C) 1998 Lacroix Pascal ([e-mail])
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/*
 * time.c - read/write time and date
 * todo: add write routines
 */

#include <asm/io.h>
#include <time.h>

inline byte read_cmos(int reg)
{
   outb(0x70, reg);
   return (byte) inb(0x71);
}

void gettime(struct time* t)
{
   if (t) {
      t->sec = read_cmos(0);
      t->min = read_cmos(2);
      t->hour= read_cmos(4);
   }
}

void getdate(struct date* d)
{
   if (d) {
      d->dayofweek = read_cmos(6);
      d->day = read_cmos(7);
      d->month = read_cmos(8);
      d->year = read_cmos(9);
   }
}