gem5/arch/mips/regfile.hh

/*
 * Copyright (c) 2003-2005 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
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef __ARCH_MIPS_REGFILE_HH__
#define __ARCH_MIPS_REGFILE_HH__

#include "arch/mips/types.hh"
#include "arch/mips/constants.hh"
#include "arch/mips/int_regfile.hh"
#include "arch/mips/float_regfile.hh"
#include "arch/mips/misc_regfile.hh"
#include "sim/faults.hh"

class Checkpoint;
class ExecContext;

namespace MipsISA
{
    class RegFile {
      protected:
        IntRegFile intRegFile;		// (signed) integer register file
        FloatRegFile floatRegFile;	// floating point register file
        MiscRegFile miscRegFile;	// control register file

      public:

        void clear()
        {
            bzero(&intRegFile, sizeof(intRegFile));
            bzero(&floatRegFile, sizeof(floatRegFile));
            bzero(&miscRegFile, sizeof(miscRegFile));
        }

        MiscReg readMiscReg(int miscReg)
        {
            if (miscReg < CtrlReg_DepTag)
                return miscRegFile.readReg(miscReg);
            else {
                switch (miscReg)
                {
                  case Hi:
                    return intRegFile.readHi();

                  case Lo:
                    return intRegFile.readLo();

                  case FIR:
                    return floatRegFile.readFIR();

                  case FCSR:
                    return floatRegFile.readFCSR();

                  case FPCR:
                    return floatRegFile.readFPCR();

                  default:
                    panic("Invalid Misc. Reg. Access\n");
                    return 0;
                }
            }
        }

        MiscReg readMiscRegWithEffect(int miscReg,
                Fault &fault, ExecContext *xc)
        {
            fault = NoFault;
            return miscRegFile.readRegWithEffect(miscReg, fault, xc);
        }

        Fault setMiscReg(int miscReg, const MiscReg &val)
        {
            if (miscReg < CtrlReg_DepTag)
                return miscRegFile.setReg(miscReg, val);
            else {
                switch (miscReg)
                {
                  case Hi:
                    return intRegFile.setHi(val);

                  case Lo:
                    return intRegFile.setLo(val);

                  case FIR:
                    return floatRegFile.setFIR(val);

                  case FCSR:
                    return floatRegFile.setFCSR(val);

                  case FPCR:
                    return floatRegFile.setFPCR(val);

                  default:
                    panic("Invalid Misc. Reg. Access\n");
                    return 0;
                }
            }
        }

        Fault setMiscRegWithEffect(int miscReg, const MiscReg &val,
                ExecContext * xc)
        {
            return miscRegFile.setRegWithEffect(miscReg, val, xc);
        }

        FloatReg readFloatReg(int floatReg)
        {
            return floatRegFile.readReg(floatReg,SingleWidth);
        }

        FloatReg readFloatReg(int floatReg, int width)
        {
            return floatRegFile.readReg(floatReg,width);
        }

        FloatRegBits readFloatRegBits(int floatReg)
        {
            return floatRegFile.readRegBits(floatReg,SingleWidth);
        }

        FloatRegBits readFloatRegBits(int floatReg, int width)
        {
            return floatRegFile.readRegBits(floatReg,width);
        }

        Fault setFloatReg(int floatReg, const FloatReg &val)
        {
            return floatRegFile.setReg(floatReg, val, SingleWidth);
        }

        Fault setFloatReg(int floatReg, const FloatReg &val, int width)
        {
            return floatRegFile.setReg(floatReg, val, width);
        }

        Fault setFloatRegBits(int floatReg, const FloatRegBits &val)
        {
            return floatRegFile.setRegBits(floatReg, val, SingleWidth);
        }

        Fault setFloatRegBits(int floatReg, const FloatRegBits &val, int width)
        {
            return floatRegFile.setRegBits(floatReg, val, width);
        }

        IntReg readIntReg(int intReg)
        {
            return intRegFile.readReg(intReg);
        }

        Fault setIntReg(int intReg, const IntReg &val)
        {
            return intRegFile.setReg(intReg, val);
        }
      protected:

        Addr pc;			// program counter
        Addr npc;			// next-cycle program counter
        Addr nnpc;			// next-next-cycle program counter
                                        // used to implement branch delay slot
                                        // not real register
      public:
        Addr readPC()
        {
            return pc;
        }

        void setPC(Addr val)
        {
            pc = val;
        }

        Addr readNextPC()
        {
            return npc;
        }

        void setNextPC(Addr val)
        {
            npc = val;
        }

        Addr readNextNPC()
        {
            return nnpc;
        }

        void setNextNPC(Addr val)
        {
            nnpc = val;
        }


#if FULL_SYSTEM
        IntReg palregs[NumIntRegs];	// PAL shadow registers
        InternalProcReg ipr[NumInternalProcRegs]; // internal processor regs
        int intrflag;			// interrupt flag
        bool pal_shadow;		// using pal_shadow registers
        inline int instAsid() { return MIPS34K::ITB_ASN_ASN(ipr[IPR_ITB_ASN]); }
        inline int dataAsid() { return MIPS34K::DTB_ASN_ASN(ipr[IPR_DTB_ASN]); }
#endif // FULL_SYSTEM

        void serialize(std::ostream &os);
        void unserialize(Checkpoint *cp, const std::string &section);

        typedef int ContextParam;
        typedef int ContextVal;

        void changeContext(ContextParam param, ContextVal val)
        {
        }
    };

    void copyRegs(ExecContext *src, ExecContext *dest);

    void copyMiscRegs(ExecContext *src, ExecContext *dest);

#if FULL_SYSTEM
    void copyIprs(ExecContext *src, ExecContext *dest);
#endif
} // namespace MipsISA

#endif