int_regfile.cc

来自「M5,一个功能强大的多处理器系统模拟器.很多针对处理器架构,性能的研究都使用它作」· CC 代码 · 共 143 行

/*
 * Copyright (c) 2003, 2004, 2005
 * The Regents of The University of Michigan
 * All Rights Reserved
 *
 * This code is part of the M5 simulator.
 *
 * Permission is granted to use, copy, create derivative works and
 * redistribute this software and such derivative works for any
 * purpose, so long as the copyright notice above, this grant of
 * permission, and the disclaimer below appear in all copies made; and
 * so long as the name of The University of Michigan is not used in
 * any advertising or publicity pertaining to the use or distribution
 * of this software without specific, written prior authorization.
 *
 * THIS SOFTWARE IS PROVIDED AS IS, WITHOUT REPRESENTATION FROM THE
 * UNIVERSITY OF MICHIGAN AS TO ITS FITNESS FOR ANY PURPOSE, AND
 * WITHOUT WARRANTY BY THE UNIVERSITY OF MICHIGAN OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE. THE REGENTS OF THE UNIVERSITY OF MICHIGAN SHALL NOT BE
 * LIABLE FOR ANY DAMAGES, INCLUDING DIRECT, SPECIAL, INDIRECT,
 * INCIDENTAL, OR CONSEQUENTIAL DAMAGES, WITH RESPECT TO ANY CLAIM
 * ARISING OUT OF OR IN CONNECTION WITH THE USE OF THE SOFTWARE, EVEN
 * IF IT HAS BEEN OR IS HEREAFTER ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGES.
 *
 * Authors: Gabe M. Black
 *          Korey L. Sewell
 */

/*
 * Copyright (c) 2007 MIPS Technologies, Inc.  All Rights Reserved
 *
 * This software is part of the M5 simulator.
 *
 * THIS IS A LEGAL AGREEMENT.  BY DOWNLOADING, USING, COPYING, CREATING
 * DERIVATIVE WORKS, AND/OR DISTRIBUTING THIS SOFTWARE YOU ARE AGREEING
 * TO THESE TERMS AND CONDITIONS.
 *
 * Permission is granted to use, copy, create derivative works and
 * distribute this software and such derivative works for any purpose,
 * so long as (1) the copyright notice above, this grant of permission,
 * and the disclaimer below appear in all copies and derivative works
 * made, (2) the copyright notice above is augmented as appropriate to
 * reflect the addition of any new copyrightable work in a derivative
 * work (e.g., Copyright (c) <Publication Year> Copyright Owner), and (3)
 * the name of MIPS Technologies, Inc. (∪MIPS∩) is not used in any
 * advertising or publicity pertaining to the use or distribution of
 * this software without specific, written prior authorization.
 *
 * THIS SOFTWARE IS PROVIDED ∪AS IS.∩  MIPS MAKES NO WARRANTIES AND
 * DISCLAIMS ALL WARRANTIES, WHETHER EXPRESS, STATUTORY, IMPLIED OR
 * OTHERWISE, INCLUDING BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND
 * NON-INFRINGEMENT OF THIRD PARTY RIGHTS, REGARDING THIS SOFTWARE.
 * IN NO EVENT SHALL MIPS BE LIABLE FOR ANY DAMAGES, INCLUDING DIRECT,
 * INDIRECT, INCIDENTAL, CONSEQUENTIAL, SPECIAL, OR PUNITIVE DAMAGES OF
 * ANY KIND OR NATURE, ARISING OUT OF OR IN CONNECTION WITH THIS AGREEMENT,
 * THIS SOFTWARE AND/OR THE USE OF THIS SOFTWARE, WHETHER SUCH LIABILITY
 * IS ASSERTED ON THE BASIS OF CONTRACT, TORT (INCLUDING NEGLIGENCE OR
 * STRICT LIABILITY), OR OTHERWISE, EVEN IF MIPS HAS BEEN WARNED OF THE
 * POSSIBILITY OF ANY SUCH LOSS OR DAMAGE IN ADVANCE.
 *
 * Authors: Korey Sewell
 *          Jaidev Patwardhan
 *
 */

#include "arch/mips/regfile/int_regfile.hh"
#include "sim/serialize.hh"

using namespace MipsISA;
using namespace std;


void
IntRegFile::clear()
{
    bzero(&regs, sizeof(regs));
    currShadowSet=0;
}

void
IntRegFile::setShadowSet(int css)
{
    DPRINTF(MipsPRA,"Setting Shadow Set to :%d (%s)\n",css,currShadowSet);
    currShadowSet = css;
}

IntReg
IntRegFile::readReg(int intReg)
{
    if(intReg < NumIntRegs)
    { // Regular GPR Read
        DPRINTF(MipsPRA,"Reading Reg: %d, CurrShadowSet: %d\n",intReg,currShadowSet);
        if(intReg >= NumIntArchRegs*NumShadowRegSets){
            return regs[intReg+NumIntRegs*currShadowSet];
        }
        else {
            return regs[(intReg + NumIntArchRegs*currShadowSet) % NumIntArchRegs];
        }
    }
    else
    { // Read from shadow GPR .. probably called by RDPGPR
        return regs[intReg];
    }
}

Fault
IntRegFile::setReg(int intReg, const IntReg &val)
{
    if (intReg != ZeroReg) {

        if(intReg < NumIntRegs)
        {
            if(intReg >= NumIntArchRegs*NumShadowRegSets){
                regs[intReg] = val;
            }
            else{
                regs[intReg+NumIntRegs*currShadowSet] = val;
            }
        }
        else{
            regs[intReg] = val;
        }
    }
    return NoFault;
}

void
IntRegFile::serialize(std::ostream &os)
{
    SERIALIZE_ARRAY(regs, NumIntRegs);
}

void
IntRegFile::unserialize(Checkpoint *cp, const std::string &section)
{
    UNSERIALIZE_ARRAY(regs, NumIntRegs);
}