131 lines
4.3 KiB
C++
131 lines
4.3 KiB
C++
/*
|
|
* Copyright (c) 2005-2006 The Regents of The University of Michigan
|
|
* 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
|
|
*/
|
|
|
|
#ifndef __CPU_O3_SCOREBOARD_HH__
|
|
#define __CPU_O3_SCOREBOARD_HH__
|
|
|
|
#include <iostream>
|
|
#include <utility>
|
|
#include <vector>
|
|
#include "base/trace.hh"
|
|
#include "base/traceflags.hh"
|
|
#include "cpu/o3/comm.hh"
|
|
|
|
/**
|
|
* Implements a simple scoreboard to track which registers are ready.
|
|
* This class assumes that the fp registers start, index wise, right after
|
|
* the integer registers. The misc. registers start, index wise, right after
|
|
* the fp registers.
|
|
* @todo: Fix up handling of the zero register in case the decoder does not
|
|
* automatically make insts that write the zero register into nops.
|
|
*/
|
|
class Scoreboard
|
|
{
|
|
public:
|
|
/** Constructs a scoreboard.
|
|
* @param activeThreads The number of active threads.
|
|
* @param _numLogicalIntRegs Number of logical integer registers.
|
|
* @param _numPhysicalIntRegs Number of physical integer registers.
|
|
* @param _numLogicalFloatRegs Number of logical fp registers.
|
|
* @param _numPhysicalFloatRegs Number of physical fp registers.
|
|
* @param _numMiscRegs Number of miscellaneous registers.
|
|
* @param _zeroRegIdx Index of the zero register.
|
|
*/
|
|
Scoreboard(unsigned activeThreads,
|
|
unsigned _numLogicalIntRegs,
|
|
unsigned _numPhysicalIntRegs,
|
|
unsigned _numLogicalFloatRegs,
|
|
unsigned _numPhysicalFloatRegs,
|
|
unsigned _numMiscRegs,
|
|
unsigned _zeroRegIdx);
|
|
|
|
/** Destructor. */
|
|
~Scoreboard() {}
|
|
|
|
/** Returns the name of the scoreboard. */
|
|
std::string name() const;
|
|
|
|
/** Checks if the register is ready. */
|
|
bool getReg(PhysRegIndex ready_reg);
|
|
|
|
/** Sets the register as ready. */
|
|
void setReg(PhysRegIndex phys_reg);
|
|
|
|
/** Sets the register as not ready. */
|
|
void unsetReg(PhysRegIndex ready_reg);
|
|
|
|
private:
|
|
/** Scoreboard of physical integer registers, saying whether or not they
|
|
* are ready.
|
|
*/
|
|
std::vector<bool> regScoreBoard;
|
|
|
|
/** Number of logical integer registers. */
|
|
int numLogicalIntRegs;
|
|
|
|
/** Number of physical integer registers. */
|
|
int numPhysicalIntRegs;
|
|
|
|
/** Number of logical floating point registers. */
|
|
int numLogicalFloatRegs;
|
|
|
|
/** Number of physical floating point registers. */
|
|
int numPhysicalFloatRegs;
|
|
|
|
/** Number of miscellaneous registers. */
|
|
int numMiscRegs;
|
|
|
|
/** Number of logical integer + float registers. */
|
|
int numLogicalRegs;
|
|
|
|
/** Number of physical integer + float registers. */
|
|
int numPhysicalRegs;
|
|
|
|
/** The logical index of the zero register. */
|
|
int zeroRegIdx;
|
|
|
|
int currentSize;
|
|
|
|
void
|
|
resize(int newSize)
|
|
{
|
|
currentSize = newSize;
|
|
regScoreBoard.resize(newSize);
|
|
}
|
|
|
|
bool
|
|
indexInBounds(int idx)
|
|
{
|
|
return idx < currentSize;
|
|
}
|
|
};
|
|
|
|
#endif
|