gem5/src/arch/sparc/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: Gabe Black
 *          Ali Saidi
 */

#ifndef __ARCH_SPARC_MISCREGFILE_HH__
#define __ARCH_SPARC_MISCREGFILE_HH__

#include "arch/sparc/asi.hh"
#include "arch/sparc/faults.hh"
#include "arch/sparc/isa_traits.hh"
#include "arch/sparc/types.hh"
#include "cpu/cpuevent.hh"

#include <string>

namespace SparcISA
{

    //These functions map register indices to names
    std::string getMiscRegName(RegIndex);

    enum MiscRegIndex
    {
        /** Ancillary State Registers */
        MISCREG_Y,
        MISCREG_CCR,
        MISCREG_ASI,
        MISCREG_TICK,
        MISCREG_FPRS,
        MISCREG_PCR,
        MISCREG_PIC,
        MISCREG_GSR,
        MISCREG_SOFTINT_SET,
        MISCREG_SOFTINT_CLR,
        MISCREG_SOFTINT,
        MISCREG_TICK_CMPR,
        MISCREG_STICK,
        MISCREG_STICK_CMPR,

        /** Privilged Registers */
        MISCREG_TPC,
        MISCREG_TNPC,
        MISCREG_TSTATE,
        MISCREG_TT,
        MISCREG_PRIVTICK,
        MISCREG_TBA,
        MISCREG_PSTATE,
        MISCREG_TL,
        MISCREG_PIL,
        MISCREG_CWP,
        MISCREG_CANSAVE,
        MISCREG_CANRESTORE,
        MISCREG_CLEANWIN,
        MISCREG_OTHERWIN,
        MISCREG_WSTATE,
        MISCREG_GL,

        /** Hyper privileged registers */
        MISCREG_HPSTATE,
        MISCREG_HTSTATE,
        MISCREG_HINTP,
        MISCREG_HTBA,
        MISCREG_HVER,
        MISCREG_STRAND_STS_REG,
        MISCREG_HSTICK_CMPR,

        /** Floating Point Status Register */
        MISCREG_FSR
    };

    // The control registers, broken out into fields
    class MiscRegFile
    {
      private:

        /* ASR Registers */
        uint64_t y;		// Y (used in obsolete multiplication)
        uint8_t	ccr;		// Condition Code Register
        uint8_t asi;		// Address Space Identifier
        uint64_t tick;		// Hardware clock-tick counter
        uint8_t	fprs;		// Floating-Point Register State
        uint64_t gsr;		// General Status Register
        uint64_t softint;
        uint64_t tick_cmpr;	// Hardware tick compare registers
        uint64_t stick;		// Hardware clock-tick counter
        uint64_t stick_cmpr;	// Hardware tick compare registers


        /* Privileged Registers */
        uint64_t tpc[MaxTL];	// Trap Program Counter (value from
                                // previous trap level)
        uint64_t tnpc[MaxTL];	// Trap Next Program Counter (value from
                                // previous trap level)
        uint64_t tstate[MaxTL];	// Trap State
        uint16_t tt[MaxTL];	// Trap Type (Type of trap which occured
                                // on the previous level)
        uint64_t tba;		// Trap Base Address

        uint16_t pstate;	// Process State Register
        uint8_t tl;		// Trap Level
        uint8_t pil;		// Process Interrupt Register
        uint8_t cwp;		// Current Window Pointer
        uint8_t cansave;	// Savable windows
        uint8_t canrestore;	// Restorable windows
        uint8_t cleanwin;	// Clean windows
        uint8_t otherwin;	// Other windows
        uint8_t wstate;		// Window State
        uint8_t gl;             // Global level register

        /** Hyperprivileged Registers */
        uint64_t hpstate;	// Hyperprivileged State Register
        uint64_t htstate[MaxTL];// Hyperprivileged Trap State Register
        uint64_t hintp;
        uint64_t htba;		// Hyperprivileged Trap Base Address register
        uint64_t hstick_cmpr;	// Hardware tick compare registers

        uint64_t strandStatusReg;// Per strand status register

        /** Floating point misc registers. */
        uint64_t fsr;		// Floating-Point State Register

        ASI implicitInstAsi;
        ASI implicitDataAsi;

        // These need to check the int_dis field and if 0 then
        // set appropriate bit in softint and checkinterrutps on the cpu
#if FULL_SYSTEM
        /** Process a tick compare event and generate an interrupt on the cpu if
         * appropriate. */
        void processTickCompare(ThreadContext *tc);
        void processSTickCompare(ThreadContext *tc);
        void processHSTickCompare(ThreadContext *tc);

        typedef CpuEventWrapper<MiscRegFile,
                &MiscRegFile::processTickCompare> TickCompareEvent;
        TickCompareEvent *tickCompare;

        typedef CpuEventWrapper<MiscRegFile,
                &MiscRegFile::processSTickCompare> STickCompareEvent;
        STickCompareEvent *sTickCompare;

        typedef CpuEventWrapper<MiscRegFile,
                &MiscRegFile::processHSTickCompare> HSTickCompareEvent;
        HSTickCompareEvent *hSTickCompare;
#endif
      public:

        void reset();

        MiscRegFile()
        {
            reset();
        }

        MiscReg readReg(int miscReg);

        MiscReg readRegWithEffect(int miscReg, ThreadContext *tc);

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

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

        ASI getInstAsid()
        {
            return implicitInstAsi;
        }

        ASI getDataAsid()
        {
            return implicitDataAsi;
        }

        void serialize(std::ostream & os);

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

        void copyMiscRegs(ThreadContext * tc);

      protected:

        bool isHyperPriv() { return (hpstate & (1 << 2)); }
        bool isPriv() { return (hpstate & (1 << 2)) || (pstate & (1 << 2)); }
        bool isNonPriv() { return !isPriv(); }
        inline void setImplicitAsis();
    };
}

#endif