2006-04-23 00:26:48 +02:00
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/*
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2006-06-07 22:02:55 +02:00
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* Copyright (c) 2005-2006 The Regents of The University of Michigan
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2013-10-15 20:22:43 +02:00
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* Copyright (c) 2013 Advanced Micro Devices, Inc.
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2006-04-23 00:26:48 +02:00
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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2006-06-07 22:02:55 +02:00
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*
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* Authors: Korey Sewell
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* Kevin Lim
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2013-10-15 20:22:43 +02:00
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* Steve Reinhardt
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2006-04-23 00:26:48 +02:00
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*/
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#ifndef __CPU_O3_SCOREBOARD_HH__
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#define __CPU_O3_SCOREBOARD_HH__
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#include <iostream>
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#include <utility>
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#include <vector>
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2011-04-15 19:44:06 +02:00
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2006-04-23 00:26:48 +02:00
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#include "base/trace.hh"
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#include "config/the_isa.hh"
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#include "cpu/o3/comm.hh"
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#include "debug/Scoreboard.hh"
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/**
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* Implements a simple scoreboard to track which registers are
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* ready. This class operates on the unified physical register space,
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* so integer and floating-point registers are not distinguished. For
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* convenience, it also accepts operations on the physical-space
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* mapping of misc registers, which are numbered starting after the
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* end of the actual physical register file. However, there is no
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* actual scoreboard for misc registers, and they are always
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* considered ready.
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*/
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class Scoreboard
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{
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private:
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/** The object name, for DPRINTF. We have to declare this
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* explicitly because Scoreboard is not a SimObject. */
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const std::string _name;
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/** Scoreboard of physical integer registers, saying whether or not they
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* are ready. */
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std::vector<bool> regScoreBoard;
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/** The number of actual physical registers */
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unsigned numPhysRegs;
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/**
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* The total number of registers which can be indexed, including
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* the misc registers that come after the physical registers and
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* which are hardwired to be always considered ready.
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*/
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2014-03-07 21:56:23 +01:00
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unsigned M5_CLASS_VAR_USED numTotalRegs;
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/** The index of the zero register. */
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PhysRegIndex zeroRegIdx;
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/** The index of the FP zero register. */
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PhysRegIndex fpZeroRegIdx;
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bool isZeroReg(PhysRegIndex idx) const
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{
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return (idx == zeroRegIdx ||
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(THE_ISA == ALPHA_ISA && idx == fpZeroRegIdx));
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}
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public:
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/** Constructs a scoreboard.
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* @param _numPhysicalRegs Number of physical registers.
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* @param _numMiscRegs Number of miscellaneous registers.
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* @param _zeroRegIdx Index of the zero register.
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* @param _fpZeroRegIdx Index of the FP zero register (if any, currently
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* used only for Alpha).
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*/
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Scoreboard(const std::string &_my_name,
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unsigned _numPhysicalRegs,
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unsigned _numMiscRegs,
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PhysRegIndex _zeroRegIdx,
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PhysRegIndex _fpZeroRegIdx);
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/** Destructor. */
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~Scoreboard() {}
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/** Returns the name of the scoreboard. */
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std::string name() const { return _name; };
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/** Checks if the register is ready. */
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bool getReg(PhysRegIndex reg_idx) const
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{
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assert(reg_idx < numTotalRegs);
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if (reg_idx >= numPhysRegs) {
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// misc regs are always ready
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return true;
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}
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bool ready = regScoreBoard[reg_idx];
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if (isZeroReg(reg_idx))
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assert(ready);
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return ready;
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}
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/** Sets the register as ready. */
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void setReg(PhysRegIndex reg_idx)
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{
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assert(reg_idx < numTotalRegs);
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if (reg_idx >= numPhysRegs) {
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// misc regs are always ready, ignore attempts to change that
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return;
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}
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2006-04-23 00:26:48 +02:00
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DPRINTF(Scoreboard, "Setting reg %i as ready\n", reg_idx);
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assert(reg_idx < numTotalRegs);
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regScoreBoard[reg_idx] = true;
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}
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/** Sets the register as not ready. */
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void unsetReg(PhysRegIndex reg_idx)
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{
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assert(reg_idx < numTotalRegs);
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2006-04-23 00:26:48 +02:00
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if (reg_idx >= numPhysRegs) {
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// misc regs are always ready, ignore attempts to change that
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return;
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}
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2010-10-04 20:58:06 +02:00
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2013-10-15 20:22:43 +02:00
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// zero reg should never be marked unready
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if (isZeroReg(reg_idx))
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return;
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2010-10-04 20:58:06 +02:00
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regScoreBoard[reg_idx] = false;
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}
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2006-04-23 00:26:48 +02:00
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};
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#endif
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