/*
* $Id$
*
* Copyright (C) 2003-2015 JNode.org
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library 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 Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; If not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
package org.jnode.driver.system.cmos.def;
import javax.naming.NameNotFoundException;
import org.jnode.driver.system.cmos.CMOSConstants;
import org.jnode.naming.InitialNaming;
import org.jnode.system.resource.IOResource;
import org.jnode.system.resource.ResourceManager;
import org.jnode.system.resource.ResourceNotFreeException;
import org.jnode.system.resource.ResourceOwner;
/**
* @author epr
*/
final class CMOS implements CMOSConstants {
/**
* CMOS I/O ports
*/
private final IOResource cmosIO;
/**
* Create a new instance
*
* @param owner
* @throws ResourceNotFreeException
*/
public CMOS(ResourceOwner owner)
throws ResourceNotFreeException {
try {
final ResourceManager rm = InitialNaming.lookup(ResourceManager.NAME);
this.cmosIO = rm.claimIOResource(owner, CMOS_FIRST_PORT, CMOS_LAST_PORT - CMOS_FIRST_PORT + 1);
} catch (NameNotFoundException ex) {
throw new ResourceNotFreeException("Cannot find ResourceManager", ex);
}
}
/**
* Release all resources
*/
public void release() {
cmosIO.release();
}
/**
* Gets a register from the CMOS data
*
* @param register [0..63]
* @return
*/
public synchronized int getRegister(int register) {
// We must make sure that bit 7 of the address data is not
// changed, since it controls the NMI.
int addr = cmosIO.inPortByte(PRW8_ADDRESS);
addr &= 0x80; /* Clear lower 7 bits */
addr |= (register & 0x7F);
cmosIO.outPortByte(PRW8_ADDRESS, addr);
return cmosIO.inPortByte(PRW8_DATA);
}
/**
* Sets a register from the CMOS data
*
* @param register [0..63]
* @param value
*/
public synchronized void setRegister(int register, int value) {
// We must make sure that bit 7 of the address data is not
// changed, since it controls the NMI.
int addr = cmosIO.inPortByte(PRW8_ADDRESS);
addr &= 0x80; /* Clear lower 7 bits */
addr |= (register & 0x7F);
cmosIO.outPortByte(PRW8_ADDRESS, addr);
cmosIO.outPortByte(PRW8_DATA, value);
}
}