| /* |
| * 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" |
| #include "debug/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; |
| } |