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/*
* Copyright (c) 2005-2006 The Regents of The University of Michigan
* Copyright (c) 2013 Advanced Micro Devices, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Authors: Korey Sewell
* Kevin Lim
* Steve Reinhardt
*/
#ifndef __CPU_O3_SCOREBOARD_HH__
#define __CPU_O3_SCOREBOARD_HH__
#include <iostream>
#include <utility>
#include <vector>
#include "base/trace.hh"
#include "config/the_isa.hh"
#include "cpu/o3/comm.hh"
#include "debug/Scoreboard.hh"
/**
* Implements a simple scoreboard to track which registers are
* ready. This class operates on the unified physical register space,
* because the different classes of registers do not need to be distinguished.
* Registers being part of a fixed mapping are always considered ready.
*/
class Scoreboard
{
private:
/** The object name, for DPRINTF. We have to declare this
* explicitly because Scoreboard is not a SimObject. */
const std::string _name;
/** Scoreboard of physical integer registers, saying whether or not they
* are ready. */
std::vector<bool> regScoreBoard;
/** The number of actual physical registers */
unsigned numPhysRegs;
public:
/** Constructs a scoreboard.
* @param _numPhysicalRegs Number of physical registers.
* @param _numMiscRegs Number of miscellaneous registers.
*/
Scoreboard(const std::string &_my_name,
unsigned _numPhysicalRegs);
/** Destructor. */
~Scoreboard() {}
/** Returns the name of the scoreboard. */
std::string name() const { return _name; };
/** Checks if the register is ready. */
bool getReg(PhysRegIdPtr phys_reg) const
{
assert(phys_reg->flatIdx < numPhysRegs);
if (phys_reg->isFixedMapping()) {
// Fixed mapping regs are always ready
return true;
}
bool ready = regScoreBoard[phys_reg->flatIdx];
if (phys_reg->isZeroReg())
assert(ready);
return ready;
}
/** Sets the register as ready. */
void setReg(PhysRegIdPtr phys_reg)
{
assert(phys_reg->flatIdx < numPhysRegs);
if (phys_reg->isFixedMapping()) {
// Fixed mapping regs are always ready, ignore attempts to change
// that
return;
}
DPRINTF(Scoreboard, "Setting reg %i (%s) as ready\n", phys_reg->regIdx,
RegClassStrings[phys_reg->regClass]);
regScoreBoard[phys_reg->flatIdx] = true;
}
/** Sets the register as not ready. */
void unsetReg(PhysRegIdPtr phys_reg)
{
assert(phys_reg->flatIdx < numPhysRegs);
if (phys_reg->isFixedMapping()) {
// Fixed mapping regs are always ready, ignore attempts to
// change that
return;
}
// zero reg should never be marked unready
if (phys_reg->isZeroReg())
return;
regScoreBoard[phys_reg->flatIdx] = false;
}
};
#endif
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