gem5/src/arch/alpha/miscregfile.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
 * (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: Steve Reinhardt
 *          Gabe Black
 */

#ifndef __ARCH_ALPHA_MISCREGFILE_HH__
#define __ARCH_ALPHA_MISCREGFILE_HH__

#include "arch/alpha/ipr.hh"
#include "arch/alpha/types.hh"
#include "config/full_system.hh"
#include "sim/host.hh"
#include "sim/serialize.hh"

#include <iostream>

class Checkpoint;
class ThreadContext;

namespace AlphaISA
{
    enum MiscRegIndex
    {
        MISCREG_FPCR = NumInternalProcRegs,
        MISCREG_UNIQ,
        MISCREG_LOCKFLAG,
        MISCREG_LOCKADDR,
        MISCREG_INTR
    };

    class MiscRegFile {
      protected:
        uint64_t	fpcr;		// floating point condition codes
        uint64_t	uniq;		// process-unique register
        bool		lock_flag;	// lock flag for LL/SC
        Addr		lock_addr;	// lock address for LL/SC
        int		intr_flag;

      public:
        MiscRegFile()
        {
#if FULL_SYSTEM
            initializeIprTable();
#endif
        }

        MiscReg readReg(int misc_reg);

        MiscReg readRegWithEffect(int misc_reg, ThreadContext *tc);

        //These functions should be removed once the simplescalar cpu model
        //has been replaced.
        int getInstAsid();
        int getDataAsid();

        void setReg(int misc_reg, const MiscReg &val);

        void setRegWithEffect(int misc_reg, const MiscReg &val,
                ThreadContext *tc);

        void clear()
        {
            fpcr = uniq = 0;
            lock_flag = 0;
            lock_addr = 0;
            intr_flag = 0;
        }

        void serialize(std::ostream &os);

        void unserialize(Checkpoint *cp, const std::string &section);
#if FULL_SYSTEM
      protected:
        typedef uint64_t InternalProcReg;

        InternalProcReg ipr[NumInternalProcRegs]; // Internal processor regs

      private:
        InternalProcReg readIpr(int idx, ThreadContext *tc);

        void setIpr(int idx, InternalProcReg val, ThreadContext *tc);
#endif
        friend class RegFile;
    };

#if FULL_SYSTEM
    void copyIprs(ThreadContext *src, ThreadContext *dest);
#endif

}

#endif