scoreboard.hh revision 2689
1/* 2 * Copyright (c) 2005-2006 The Regents of The University of Michigan 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are 7 * met: redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer; 9 * redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution; 12 * neither the name of the copyright holders nor the names of its 13 * contributors may be used to endorse or promote products derived from 14 * this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 * Authors: Korey Sewell 29 * Kevin Lim 30 */ 31 32#ifndef __CPU_O3_SCOREBOARD_HH__ 33#define __CPU_O3_SCOREBOARD_HH__ 34 35#include <iostream> 36#include <utility> 37#include <vector> 38#include "arch/alpha/isa_traits.hh" 39#include "base/trace.hh" 40#include "base/traceflags.hh" 41#include "cpu/o3/comm.hh" 42 43/** 44 * Implements a simple scoreboard to track which registers are ready. 45 * This class assumes that the fp registers start, index wise, right after 46 * the integer registers. The misc. registers start, index wise, right after 47 * the fp registers. 48 * @todo: Fix up handling of the zero register in case the decoder does not 49 * automatically make insts that write the zero register into nops. 50 */ 51class Scoreboard 52{ 53 public: 54 /** Constructs a scoreboard. 55 * @param activeThreads The number of active threads. 56 * @param _numLogicalIntRegs Number of logical integer registers. 57 * @param _numPhysicalIntRegs Number of physical integer registers. 58 * @param _numLogicalFloatRegs Number of logical fp registers. 59 * @param _numPhysicalFloatRegs Number of physical fp registers. 60 * @param _numMiscRegs Number of miscellaneous registers. 61 * @param _zeroRegIdx Index of the zero register. 62 */ 63 Scoreboard(unsigned activeThreads, 64 unsigned _numLogicalIntRegs, 65 unsigned _numPhysicalIntRegs, 66 unsigned _numLogicalFloatRegs, 67 unsigned _numPhysicalFloatRegs, 68 unsigned _numMiscRegs, 69 unsigned _zeroRegIdx); 70 71 /** Destructor. */ 72 ~Scoreboard() {} 73 74 /** Returns the name of the scoreboard. */ 75 std::string name() const; 76 77 /** Checks if the register is ready. */ 78 bool getReg(PhysRegIndex ready_reg); 79 80 /** Sets the register as ready. */ 81 void setReg(PhysRegIndex phys_reg); 82 83 /** Sets the register as not ready. */ 84 void unsetReg(PhysRegIndex ready_reg); 85 86 private: 87 /** Scoreboard of physical integer registers, saying whether or not they 88 * are ready. 89 */ 90 std::vector<bool> regScoreBoard; 91 92 /** Number of logical integer registers. */ 93 int numLogicalIntRegs; 94 95 /** Number of physical integer registers. */ 96 int numPhysicalIntRegs; 97 98 /** Number of logical floating point registers. */ 99 int numLogicalFloatRegs; 100 101 /** Number of physical floating point registers. */ 102 int numPhysicalFloatRegs; 103 104 /** Number of miscellaneous registers. */ 105 int numMiscRegs; 106 107 /** Number of logical integer + float registers. */ 108 int numLogicalRegs; 109 110 /** Number of physical integer + float registers. */ 111 int numPhysicalRegs; 112 113 /** The logical index of the zero register. */ 114 int zeroRegIdx; 115}; 116 117#endif 118