/*
JPC: An x86 PC Hardware Emulator for a pure Java Virtual Machine
Release Version 2.4
A project from the Physics Dept, The University of Oxford
Copyright (C) 2007-2010 The University of Oxford
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License version 2 as published by
the Free Software Foundation.
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.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
Details (including contact information) can be found at:
jpc.sourceforge.net
or the developer website
sourceforge.net/projects/jpc/
Conceived and Developed by:
Rhys Newman, Ian Preston, Chris Dennis
End of licence header
*/
package org.jpc.emulator.processor;
import java.io.*;
import org.jpc.emulator.memory.AddressSpace;
/**
*
* @author Chris Dennis
*/
class DescriptorTableSegment extends Segment
{
private final int base;
private final long limit;
public DescriptorTableSegment(AddressSpace memory, int base, int limit)
{
super(memory);
this.base = base;
this.limit = 0xffffffffL & limit;
}
public void saveState(DataOutput output) throws IOException
{
output.writeInt(2);
output.writeInt(base);
output.writeInt((int) limit);
}
public int getLimit()
{
return (int) limit;
}
public int getBase()
{
return base;
}
public int getSelector()
{
throw new IllegalStateException("No selector for a descriptor table segment");
}
public boolean setSelector(int selector)
{
throw new IllegalStateException("Cannot set a selector for a descriptor table segment");
}
public void checkAddress(int offset)
{
if ((0xffffffffL & offset) > limit)
{
System.out.println("Offset beyond end of Descriptor Table Segment: Offset=" + Integer.toHexString(offset) + ", limit=" + Long.toHexString(limit));
throw new ProcessorException(ProcessorException.Type.GENERAL_PROTECTION, offset, true);
}
}
public int translateAddressRead(int offset)
{
checkAddress(offset);
return base + offset;
}
public int translateAddressWrite(int offset)
{
checkAddress(offset);
return base + offset;
}
public int getDPL()
{
throw new IllegalStateException(getClass().toString());
}
public int getRPL()
{
throw new IllegalStateException(getClass().toString());
}
public void setRPL(int cpl)
{
throw new IllegalStateException(getClass().toString());
}
public boolean getDefaultSizeFlag()
{
throw new IllegalStateException(getClass().toString());
}
public int getType()
{
throw new IllegalStateException(getClass().toString());
}
public boolean isPresent()
{
return true;
}
public boolean isSystem()
{
return true;
}
public void printState()
{
System.out.println("Descriptor Table Segment");
System.out.print("base: " + Integer.toHexString(base));
System.out.println("limit: " + Long.toHexString(limit));
}
}