/**
* ****************************************************************************
* Copyright (c) 2010-2016 by Min Cai (min.cai.china@gmail.com).
* <p>
* This file is part of the Archimulator multicore architectural simulator.
* <p>
* Archimulator is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
* <p>
* Archimulator 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.
* <p>
* You should have received a copy of the GNU General Public License
* along with Archimulator. If not, see <http://www.gnu.org/licenses/>.
* ****************************************************************************
*/
package archimulator.os.event;
import archimulator.isa.ArchitecturalRegisterFile;
import archimulator.os.Context;
/**
* Read event.
*
* @author Min Cai
*/
public class ReadEvent extends SystemEvent {
private WaitForFileDescriptorCriterion waitForFileDescriptorCriterion;
/**
* Create a read event for the specified context.
*
* @param context the context
*/
public ReadEvent(Context context) {
super(context, SystemEventType.READ);
this.waitForFileDescriptorCriterion = new WaitForFileDescriptorCriterion();
}
@Override
public boolean needProcess() {
return this.waitForFileDescriptorCriterion.needProcess(this.getContext());
}
@Override
public void process() {
this.getContext().resume();
byte[] buf = new byte[this.waitForFileDescriptorCriterion.getSize()];
int numRead = this.waitForFileDescriptorCriterion.getBuffer().read(buf, 0, buf.length);
this.getContext().getRegisterFile().setGpr(ArchitecturalRegisterFile.REGISTER_V0, numRead);
this.getContext().getRegisterFile().setGpr(ArchitecturalRegisterFile.REGISTER_A3, 0);
this.getContext().getProcess().getMemory().writeBlock(this.waitForFileDescriptorCriterion.getAddress(), numRead, buf);
}
/**
* Get the wait for file descriptor criterion.
*
* @return the wait for file descriptor criterion
*/
public WaitForFileDescriptorCriterion getWaitForFileDescriptorCriterion() {
return waitForFileDescriptorCriterion;
}
}