/*
* $Id$
*
* 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.vm.x86;
import org.jnode.vm.VmMagic;
import org.jnode.annotation.MagicPermission;
import org.vmmagic.unboxed.Address;
/**
* @author Ewout Prangsma (epr@users.sourceforge.net)
*/
@MagicPermission
final class TSS32 {
private final int[] tss;
byte[] kernelStack; // Only here to keep a reference to the stack, to avoid garbage collection
byte[] userStack; // Only here to keep a reference to the stack, to avoid garbage collection
/**
* Initialize this instance.
*/
public TSS32() {
final int len = UnsafeX86.getTSS(null);
this.tss = new int[len];
UnsafeX86.getTSS(tss);
}
/**
* Gets the address of the TSS.
*/
public final Address getAddress() {
return VmMagic.getArrayData(tss);
}
public final int[] getTSS() {
return tss;
}
/**
* Sets the kernel stack
*
* @param stack
*/
public final void setKernelStack(byte[] stack) {
this.kernelStack = stack;
final Address stackBase = VmMagic.getArrayData(stack);
final Address esp = stackBase.add(stack.length - 4);
tss[1] = esp.toInt();
}
/**
* Sets the user stack
*
* @param stack
*/
public final void setUserStack(byte[] stack) {
this.userStack = stack;
final Address stackBase = VmMagic.getArrayData(stack);
final Address esp = stackBase.add(stack.length - 4);
tss[14] = esp.toInt();
}
}