rtc.c

基于组件方式开发操作系统的OSKIT源代码

/*
 * Copyright (c) 1996, 1998, 1999 University of Utah and the Flux Group.
 * All rights reserved.
 * 
 * This file is part of the Flux OSKit.  The OSKit is free software, also known
 * as "open source;" you can redistribute it and/or modify it under the terms
 * of the GNU General Public License (GPL), version 2, as published by the Free
 * Software Foundation (FSF).  To explore alternate licensing terms, contact
 * the University of Utah at [e-mail] or [phone].
 * 
 * The OSKit 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 GPL for more details.  You should have
 * received a copy of the GPL along with the OSKit; see the file COPYING.  If
 * not, write to the FSF, 59 Temple Place #330, Boston, MA 02111-1307, USA.
 */
/*
 * Routines to read and write to the Real Time Clock or other stuff in
 * NVRAM.
 */

#include <oskit/arm32/pio.h>
#include <oskit/arm32/shark/isa.h>

/*
 * Return the value of REG in the NVRAM.
 */
unsigned char
rtcin(unsigned char reg)
{
	unsigned char r;

	outb_p(IO_RTC, reg);
	r = inb_p(IO_RTC + 1);

	return r;
}

/*
 * Set the value of REG to VAL in the NVRAM.
 */
void
rtcout(unsigned char reg, unsigned char val)
{
	outb_p(IO_RTC, reg);
	outb_p(IO_RTC + 1, val);
}