/*
* $Id$
*
* 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.vm;
import javax.naming.NamingException;
import org.jnode.naming.InitialNaming;
import org.jnode.system.resource.IOResource;
import org.jnode.system.resource.IRQHandler;
import org.jnode.system.resource.IRQResource;
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.jnode.system.resource.ResourcePermission;
import org.jnode.system.resource.SimpleResourceOwner;
import org.jnode.annotation.MagicPermission;
import org.jnode.vm.scheduler.VmProcessor;
import org.vmmagic.unboxed.Address;
import org.vmmagic.unboxed.Extent;
/**
* Default implementation of ResourceManager.
*
* @author Ewout Prangsma (epr@users.sourceforge.net)
*/
@MagicPermission
final class ResourceManagerImpl implements ResourceManager {
private final ResourcePermission IOPORTS_PERM = new ResourcePermission("ioports");
private final ResourcePermission MEMSCAN_PERM = new ResourcePermission("memoryScanner");
private final MemoryScanner memScan;
/**
* Hidden constructor.
*/
private ResourceManagerImpl() {
memScan = new MemoryScannerImpl();
}
protected static ResourceManager initialize() {
try {
final Address kernelStart = Unsafe.getKernelStart();
final Address kernelEnd = Unsafe.getKernelEnd();
final Extent kernelSize = kernelEnd.toWord().sub(kernelStart.toWord()).toExtent();
MemoryResourceImpl
.claimMemoryResource(new SimpleResourceOwner("kernel"), kernelStart, kernelSize, MEMMODE_NORMAL);
final Address bootHeapStart = Unsafe.getBootHeapStart();
final Address bootHeapEnd = Unsafe.getBootHeapEnd();
final Extent bootHeapSize = bootHeapEnd.toWord().sub(bootHeapStart.toWord()).toExtent();
MemoryResourceImpl
.claimMemoryResource(new SimpleResourceOwner("bootheap"), bootHeapStart, bootHeapSize, MEMMODE_NORMAL);
ResourceManager rm = new ResourceManagerImpl();
InitialNaming.bind(NAME, rm);
return rm;
} catch (NamingException ex) {
throw new Error("Cannot initialize ResourceManager");
} catch (ResourceNotFreeException ex) {
throw new Error("Claim kernel memory");
}
}
/**
* Claim a range of IO ports
*
* @param owner
* @param startPort
* @param length
* @return The claimed resource
* @throws ResourceNotFreeException
*/
public IOResource claimIOResource(ResourceOwner owner, int startPort, int length)
throws ResourceNotFreeException {
final SecurityManager sm = System.getSecurityManager();
if (sm != null) {
sm.checkPermission(IOPORTS_PERM);
}
return IOResourceImpl.claimIOResource(owner, startPort, length);
}
/**
* Claim a memory region
*
* @param owner
* @param start
* @param size
* @param mode
* @return The claimed resource
* @throws ResourceNotFreeException
*/
public MemoryResource claimMemoryResource(ResourceOwner owner, Address start, Extent size, int mode)
throws ResourceNotFreeException {
return MemoryResourceImpl.claimMemoryResource(owner, start, size, mode);
}
/**
* Claim a memory region
*
* @param owner
* @param start
* @param size
* @param mode
* @return The claimed resource
* @throws ResourceNotFreeException
*/
public MemoryResource claimMemoryResource(ResourceOwner owner, Address start, int size, int mode)
throws ResourceNotFreeException {
return MemoryResourceImpl.claimMemoryResource(owner, start, Extent.fromIntZeroExtend(size), mode);
}
/**
* Register an interrupt handler for a given irq number.
*
* @param owner
* @param irq
* @param handler
* @param shared
* @return True is the handler was set, false if there was already a handler for the given irq
* number set.
* @throws ResourceNotFreeException
*/
public IRQResource claimIRQ(ResourceOwner owner, int irq, IRQHandler handler, boolean shared)
throws ResourceNotFreeException {
return VmProcessor.current().getIRQManager().claimIRQ(owner, irq, handler, shared);
}
/**
* Create a MemoryResource wrapper around a given byte-array.
*
* @param data
* @return The claimed resource
*/
public MemoryResource asMemoryResource(byte[] data) {
return new MemoryResourceImpl(data, data.length, 1);
}
/**
* Create a MemoryResource wrapper around a given array.
*
* @param data
* @return The claimed resource
*/
public MemoryResource asMemoryResource(char[] data) {
return new MemoryResourceImpl(data, data.length, 2);
}
/**
* Create a MemoryResource wrapper around a given array.
*
* @param data
* @return The claimed resource
*/
public MemoryResource asMemoryResource(short[] data) {
return new MemoryResourceImpl(data, data.length, 2);
}
/**
* Create a MemoryResource wrapper around a given array.
*
* @param data
* @return The claimed resource
*/
public MemoryResource asMemoryResource(int[] data) {
return new MemoryResourceImpl(data, data.length, 4);
}
/**
* Create a MemoryResource wrapper around a given array.
*
* @param data
* @return The claimed resource
*/
public MemoryResource asMemoryResource(long[] data) {
return new MemoryResourceImpl(data, data.length, 8);
}
/**
* Create a MemoryResource wrapper around a given array.
*
* @param data
* @return The claimed resource
*/
public MemoryResource asMemoryResource(float[] data) {
return new MemoryResourceImpl(data, data.length, 4);
}
/**
* Create a MemoryResource wrapper around a given array.
*
* @param data
* @return The claimed resource
*/
public MemoryResource asMemoryResource(double[] data) {
return new MemoryResourceImpl(data, data.length, 8);
}
/**
* Gets the memory scanner.
* This method will requires a ResourcePermission("memoryScanner").
*
* @return the memory scanner
*/
public MemoryScanner getMemoryScanner() {
final SecurityManager sm = System.getSecurityManager();
if (sm != null) {
sm.checkPermission(MEMSCAN_PERM);
}
return memScan;
}
}