/*
* $Id$
*
* 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.performance;
import java.util.Collections;
import java.util.Set;
import org.jnode.vm.performance.PerformanceCounterEvent;
import org.jnode.vm.performance.PerformanceCounters;
import org.jnode.vm.x86.UnsafeX86;
import org.jnode.vm.x86.VmX86Processor;
import org.jnode.vm.x86.VmX86Thread;
import org.jnode.vm.x86.X86CpuID;
import org.vmmagic.pragma.Uninterruptible;
/**
* Base class for x86 performance counters. The base-class behavior is to provide no
* meaningful support for counters.
*
* @author Ewout Prangsma (epr@users.sourceforge.net)
*/
public class X86PerformanceCounters extends PerformanceCounters implements Uninterruptible {
/**
* Create the appropriate instance for the specific cpu.
*
* @param id
* @return a new counter instance
*/
public static final X86PerformanceCounters create(VmX86Processor processor,
X86CpuID id) {
if (id.hasMSR()) {
// All known cpu's that have performance counters
// implement them via MSR's
if (id.isIntel()) {
switch (id.getFamily()) {
case 0x06:
return new P6PerformanceCouters(processor);
case 0x0F:
return new Pentium4PerformanceCounters(processor);
}
} else if (id.isAMD()) {
switch (id.getFamily()) {
case 0x0F:
return new Athlon64PerformanceCounters(processor);
}
}
}
// Fallback, no support for performance counters
return new X86PerformanceCounters(processor, 0);
}
/**
* Maximum number of simulanious counters
*/
private final int maxCounters;
/**
* The cpu we're attached to
*/
private final VmX86Processor cpu;
/**
* Initialize this instance.
*/
X86PerformanceCounters(VmX86Processor cpu, int maxCounters) {
this.maxCounters = maxCounters;
this.cpu = cpu;
}
public Set<PerformanceCounterEvent> getAvailableEvents() {
return Collections.emptySet();
}
public PerformanceCounterEvent getAvailableEvent(String id) {
return null;
}
public final int getMaximumCounters() {
return maxCounters;
}
public final void getCounterValues(long[] counters) {
// Force a read of the counters by yielding
UnsafeX86.saveMSRs();
// Collect the data
getCounterValues(counters, (VmX86Thread) cpu.getCurrentThread());
}
/**
* Gets the counters of the given thread.
*
* @param counters
* @param thread
*/
protected void getCounterValues(long[] counters, VmX86Thread thread) {
// Override me
}
public final void startCounters(PerformanceCounterEvent[] events)
throws IllegalArgumentException {
// Test if the events array is not too long
if (events.length > getMaximumCounters()) {
throw new IllegalArgumentException(
"events.length is greater then maximum available counters");
}
// Test if given events are valid for me
final Set<PerformanceCounterEvent> myEvents = getAvailableEvents();
for (PerformanceCounterEvent e : events) {
if (!myEvents.contains(e)) {
throw new IllegalArgumentException("Event " + e
+ " is not one of the available events");
}
}
// Do the actual start
startCounters(events, (VmX86Thread) cpu.getCurrentThread());
// Force a start by syncing
UnsafeX86.restoreMSRs();
}
protected void startCounters(PerformanceCounterEvent[] events,
VmX86Thread thread) throws IllegalArgumentException {
// Override me
}
public final void stopCounters() {
// TODO Implement me
final VmX86Thread thread = (VmX86Thread) cpu.getCurrentThread();
stopCounters(thread);
UnsafeX86.saveMSRs();
thread.setMSRs(null, null);
}
/**
* Stop the counters on the given thread.
*
* @param thread
*/
protected void stopCounters(VmX86Thread thread) throws IllegalArgumentException {
// Override me
}
}