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/*
* 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
*/
#include "config/the_isa.hh"
#include "cpu/o3/scoreboard.hh"
Scoreboard::Scoreboard(unsigned activeThreads,
unsigned _numLogicalIntRegs,
unsigned _numPhysicalIntRegs,
unsigned _numLogicalFloatRegs,
unsigned _numPhysicalFloatRegs,
unsigned _numMiscRegs,
unsigned _zeroRegIdx)
: numLogicalIntRegs(_numLogicalIntRegs),
numPhysicalIntRegs(_numPhysicalIntRegs),
numLogicalFloatRegs(_numLogicalFloatRegs),
numPhysicalFloatRegs(_numPhysicalFloatRegs),
numMiscRegs(_numMiscRegs),
zeroRegIdx(_zeroRegIdx)
{
//Get Register Sizes
numLogicalRegs = numLogicalIntRegs + numLogicalFloatRegs;
numPhysicalRegs = numPhysicalIntRegs + numPhysicalFloatRegs;
//Resize scoreboard appropriately
resize(numPhysicalRegs + (numMiscRegs * activeThreads));
//Initialize values
for (int i=0; i < numLogicalIntRegs * activeThreads; i++) {
assert(indexInBounds(i));
regScoreBoard[i] = 1;
}
for (int i= numPhysicalIntRegs;
i < numPhysicalIntRegs + (numLogicalFloatRegs * activeThreads);
i++) {
assert(indexInBounds(i));
regScoreBoard[i] = 1;
}
for (int i = numPhysicalRegs;
i < numPhysicalRegs + (numMiscRegs * activeThreads);
i++) {
assert(indexInBounds(i));
regScoreBoard[i] = 1;
}
}
std::string
Scoreboard::name() const
{
return "cpu.scoreboard";
}
bool
Scoreboard::getReg(PhysRegIndex phys_reg)
{
#if THE_ISA == ALPHA_ISA
// Always ready if int or fp zero reg.
if (phys_reg == zeroRegIdx ||
phys_reg == (zeroRegIdx + numPhysicalIntRegs)) {
return 1;
}
#else
// Always ready if int zero reg.
if (phys_reg == zeroRegIdx) {
return 1;
}
#endif
assert(indexInBounds(phys_reg));
return regScoreBoard[phys_reg];
}
void
Scoreboard::setReg(PhysRegIndex phys_reg)
{
DPRINTF(Scoreboard, "Setting reg %i as ready\n", phys_reg);
assert(indexInBounds(phys_reg));
regScoreBoard[phys_reg] = 1;
}
void
Scoreboard::unsetReg(PhysRegIndex ready_reg)
{
#if THE_ISA == ALPHA_ISA
if (ready_reg == zeroRegIdx ||
ready_reg == (zeroRegIdx + numPhysicalIntRegs)) {
// Don't do anything if int or fp zero reg.
return;
}
#else
if (ready_reg == zeroRegIdx) {
// Don't do anything if int zero reg.
return;
}
#endif
assert(indexInBounds(ready_reg));
regScoreBoard[ready_reg] = 0;
}
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