/*
* $Id$
*
* Copyright (C) 2003-2014 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.firmware.bios;
import java.security.AccessController;
import java.security.PrivilegedAction;
import javax.naming.NameNotFoundException;
import org.apache.log4j.Logger;
import org.jnode.driver.Device;
import org.jnode.driver.DeviceAlreadyRegisteredException;
import org.jnode.driver.Driver;
import org.jnode.driver.DriverException;
import org.jnode.driver.system.firmware.AcpiDevice;
import org.jnode.driver.system.firmware.AcpiRSDPInfo;
import org.jnode.driver.system.firmware.FirmwareAPI;
import org.jnode.naming.InitialNaming;
import org.jnode.system.resource.MemoryResource;
import org.jnode.system.resource.MemoryScanner;
import org.jnode.system.resource.ResourceManager;
import org.jnode.system.resource.ResourceNotFreeException;
import org.jnode.system.resource.ResourceOwner;
import org.vmmagic.unboxed.Address;
/**
* BIOS firmware driver implementation.
*
* @author Francois-Frederic Ozog
* @author Ewout Prangsma (epr@users.sourceforge.net)
*/
final class BiosDriver extends Driver implements FirmwareAPI {
private static final Logger log = Logger.getLogger(BiosDriver.class);
private AcpiRSDPInfo info;
private AcpiDevice acpiDevice;
/**
* Initialize this instance.
*/
public BiosDriver() {
}
/**
* Start the device
*
* @throws DriverException
*/
protected void startDevice() throws DriverException {
final Device dev = getDevice();
// Find the ACPI info
try {
final ResourceManager rm;
rm = InitialNaming.lookup(ResourceManager.NAME);
info = findAcpiRSDTPTR(rm);
} catch (NameNotFoundException ex) {
throw new DriverException("Cannot find the resource manager");
} catch (ResourceNotFreeException ex) {
log.error("Cannot claim BIOS region", ex);
}
// Register out API
dev.registerAPI(FirmwareAPI.class, this);
// Start an ACPI device if we found the info for it.
if (info != null) {
log.info("Start ACPI device");
acpiDevice = new AcpiDevice(dev.getBus(), "acpi", info);
try {
dev.getManager().register(acpiDevice);
} catch (DeviceAlreadyRegisteredException ex) {
log.error("Cannot register ACPI device", ex);
}
}
}
/**
* Stop the device
*
* @throws DriverException
*/
protected void stopDevice() throws DriverException {
final Device dev = getDevice();
if (acpiDevice != null) {
dev.getManager().unregister(acpiDevice);
}
dev.unregisterAPI(FirmwareAPI.class);
}
/**
* Find the ACPI root descriptor table.
*
* @param rm
* @return
* @throws ResourceNotFreeException
*/
private static final AcpiRSDPInfo findAcpiRSDTPTR(final ResourceManager rm) throws ResourceNotFreeException {
final byte[] match = {'R', 'S', 'D', ' ', 'P', 'T', 'R', ' '};
final MemoryScanner scanner = (MemoryScanner) AccessController.doPrivileged(new PrivilegedAction() {
public Object run() {
return rm.getMemoryScanner();
}
});
final Address tablePtr =
scanner.findInt8Array(Address.fromIntZeroExtend(0xe0000), 0x1ffff, match, 0, match.length, 1);
if (tablePtr != null) {
final int version = getRSDTVersion(rm, tablePtr);
return new AcpiRSDPInfo(tablePtr, version);
} else {
// Not an ACPI system
return null;
}
}
private static int getRSDTVersion(ResourceManager rm, Address start) {
final MemoryResource res;
try {
res = rm.claimMemoryResource(ResourceOwner.SYSTEM, start, 20, ResourceManager.MEMMODE_NORMAL);
} catch (ResourceNotFreeException e) {
// Cannot claim memory
return 1;
}
try {
return res.getByte(15);
} finally {
res.release();
}
}
}