simple_thread.hh

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/*
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 * Copyright (c) 2013 Advanced Micro Devices, Inc.
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 * not be construed as granting a license to any other intellectual
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 * to a hardware implementation of the functionality of the software
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#ifndef __CPU_SIMPLE_THREAD_HH__
#define __CPU_SIMPLE_THREAD_HH__
 
#include <algorithm>
#include <vector>
 
#include "arch/generic/htm.hh"
#include "arch/generic/mmu.hh"
#include "arch/generic/pcstate.hh"
#include "arch/generic/tlb.hh"
#include "arch/isa.hh"
#include "arch/vecregs.hh"
#include "base/types.hh"
#include "config/the_isa.hh"
#include "cpu/thread_context.hh"
#include "cpu/thread_state.hh"
#include "debug/CCRegs.hh"
#include "debug/FloatRegs.hh"
#include "debug/IntRegs.hh"
#include "debug/VecPredRegs.hh"
#include "debug/VecRegs.hh"
#include "mem/htm.hh"
#include "mem/page_table.hh"
#include "mem/request.hh"
#include "sim/byteswap.hh"
#include "sim/eventq.hh"
#include "sim/full_system.hh"
#include "sim/process.hh"
#include "sim/serialize.hh"
#include "sim/system.hh"
 
namespace gem5
{
 
class BaseCPU;
class CheckerCPU;
 
class SimpleThread : public ThreadState, public ThreadContext
{
  public:
    typedef ThreadContext::Status Status;
 
  protected:
    std::vector<RegVal> floatRegs;
    std::vector<RegVal> intRegs;
    std::vector<TheISA::VecRegContainer> vecRegs;
    std::vector<RegVal> vecElemRegs;
    std::vector<TheISA::VecPredRegContainer> vecPredRegs;
    std::vector<RegVal> ccRegs;
    TheISA::ISA *const isa;    // one "instance" of the current ISA.
 
    std::unique_ptr<PCStateBase> _pcState;
 
    // hardware transactional memory
    std::unique_ptr<BaseHTMCheckpoint> _htmCheckpoint;
 
    bool predicate;
 
    bool memAccPredicate;
 
  public:
    std::string
    name() const
    {
        return csprintf("%s.[tid:%i]", baseCpu->name(), threadId());
    }
 
    PCEventQueue pcEventQueue;
    EventQueue comInstEventQueue;
 
    System *system;
 
    BaseMMU *mmu;
 
    InstDecoder *decoder;
 
    // hardware transactional memory
    int64_t htmTransactionStarts;
    int64_t htmTransactionStops;
 
    // constructor: initialize SimpleThread from given process structure
    // FS
    SimpleThread(BaseCPU *_cpu, int _thread_num, System *_system,
                 BaseMMU *_mmu, BaseISA *_isa, InstDecoder *_decoder);
    // SE
    SimpleThread(BaseCPU *_cpu, int _thread_num, System *_system,
                 Process *_process, BaseMMU *_mmu,
                 BaseISA *_isa, InstDecoder *_decoder);
 
    virtual ~SimpleThread() {}
 
    void takeOverFrom(ThreadContext *oldContext) override;
 
    void copyState(ThreadContext *oldContext);
 
    void serialize(CheckpointOut &cp) const override;
    void unserialize(CheckpointIn &cp) override;
 
    /***************************************************************
     *  SimpleThread functions to provide CPU with access to various
     *  state.
     **************************************************************/
 
    ThreadContext *getTC() { return this; }
 
    void
    demapPage(Addr vaddr, uint64_t asn)
    {
        mmu->demapPage(vaddr, asn);
    }
 
    /*******************************************
     * ThreadContext interface functions.
     ******************************************/
 
    bool schedule(PCEvent *e) override { return pcEventQueue.schedule(e); }
    bool remove(PCEvent *e) override { return pcEventQueue.remove(e); }
 
    void
    scheduleInstCountEvent(Event *event, Tick count) override
    {
        comInstEventQueue.schedule(event, count);
    }
    void
    descheduleInstCountEvent(Event *event) override
    {
        comInstEventQueue.deschedule(event);
    }
    Tick
    getCurrentInstCount() override
    {
        return comInstEventQueue.getCurTick();
    }
 
    BaseCPU *getCpuPtr() override { return baseCpu; }
 
    int cpuId() const override { return ThreadState::cpuId(); }
    uint32_t socketId() const override { return ThreadState::socketId(); }
    int threadId() const override { return ThreadState::threadId(); }
    void setThreadId(int id) override { ThreadState::setThreadId(id); }
    ContextID contextId() const override { return ThreadState::contextId(); }
    void setContextId(ContextID id) override { ThreadState::setContextId(id); }
 
    BaseMMU *getMMUPtr() override { return mmu; }
 
    CheckerCPU *getCheckerCpuPtr() override { return NULL; }
 
    BaseISA *getIsaPtr() override { return isa; }
 
    InstDecoder *getDecoderPtr() override { return decoder; }
 
    System *getSystemPtr() override { return system; }
 
    Process *getProcessPtr() override { return ThreadState::getProcessPtr(); }
    void setProcessPtr(Process *p) override { ThreadState::setProcessPtr(p); }
 
    Status status() const override { return _status; }
 
    void setStatus(Status newStatus) override { _status = newStatus; }
 
    void activate() override;
 
    void suspend() override;
 
    void halt() override;
 
    Tick
    readLastActivate() override
    {
        return ThreadState::readLastActivate();
    }
    Tick
    readLastSuspend() override
    {
        return ThreadState::readLastSuspend();
    }
 
    void copyArchRegs(ThreadContext *tc) override;
 
    void
    clearArchRegs() override
    {
        set(_pcState, isa->newPCState());
        std::fill(intRegs.begin(), intRegs.end(), 0);
        std::fill(floatRegs.begin(), floatRegs.end(), 0);
        for (auto &vec_reg: vecRegs)
            vec_reg.zero();
        std::fill(vecElemRegs.begin(), vecElemRegs.end(), 0);
        for (auto &pred_reg: vecPredRegs)
            pred_reg.reset();
        std::fill(ccRegs.begin(), ccRegs.end(), 0);
        isa->clear();
    }
 
    //
    // New accessors for new decoder.
    //
    RegVal
    readIntReg(RegIndex reg_idx) const override
    {
        int flatIndex = isa->flattenIntIndex(reg_idx);
        assert(flatIndex < intRegs.size());
        uint64_t regVal = readIntRegFlat(flatIndex);
        DPRINTF(IntRegs, "Reading int reg %d (%d) as %#x.\n",
                reg_idx, flatIndex, regVal);
        return regVal;
    }
 
    RegVal
    readFloatReg(RegIndex reg_idx) const override
    {
        int flatIndex = isa->flattenFloatIndex(reg_idx);
        assert(flatIndex < floatRegs.size());
        RegVal regVal = readFloatRegFlat(flatIndex);
        DPRINTF(FloatRegs, "Reading float reg %d (%d) bits as %#x.\n",
                reg_idx, flatIndex, regVal);
        return regVal;
    }
 
    const TheISA::VecRegContainer&
    readVecReg(const RegId& reg) const override
    {
        int flatIndex = isa->flattenVecIndex(reg.index());
        assert(flatIndex < vecRegs.size());
        const TheISA::VecRegContainer& regVal = readVecRegFlat(flatIndex);
        DPRINTF(VecRegs, "Reading vector reg %d (%d) as %s.\n",
                reg.index(), flatIndex, regVal);
        return regVal;
    }
 
    TheISA::VecRegContainer&
    getWritableVecReg(const RegId& reg) override
    {
        int flatIndex = isa->flattenVecIndex(reg.index());
        assert(flatIndex < vecRegs.size());
        TheISA::VecRegContainer& regVal = getWritableVecRegFlat(flatIndex);
        DPRINTF(VecRegs, "Reading vector reg %d (%d) as %s for modify.\n",
                reg.index(), flatIndex, regVal);
        return regVal;
    }
 
    RegVal
    readVecElem(const RegId &reg) const override
    {
        int flatIndex = isa->flattenVecElemIndex(reg.index());
        assert(flatIndex < vecRegs.size());
        RegVal regVal = readVecElemFlat(flatIndex, reg.elemIndex());
        DPRINTF(VecRegs, "Reading element %d of vector reg %d (%d) as"
                " %#x.\n", reg.elemIndex(), reg.index(), flatIndex, regVal);
        return regVal;
    }
 
    const TheISA::VecPredRegContainer &
    readVecPredReg(const RegId &reg) const override
    {
        int flatIndex = isa->flattenVecPredIndex(reg.index());
        assert(flatIndex < vecPredRegs.size());
        const TheISA::VecPredRegContainer& regVal =
            readVecPredRegFlat(flatIndex);
        DPRINTF(VecPredRegs, "Reading predicate reg %d (%d) as %s.\n",
                reg.index(), flatIndex, regVal);
        return regVal;
    }
 
    TheISA::VecPredRegContainer &
    getWritableVecPredReg(const RegId &reg) override
    {
        int flatIndex = isa->flattenVecPredIndex(reg.index());
        assert(flatIndex < vecPredRegs.size());
        TheISA::VecPredRegContainer& regVal =
            getWritableVecPredRegFlat(flatIndex);
        DPRINTF(VecPredRegs,
                "Reading predicate reg %d (%d) as %s for modify.\n",
                reg.index(), flatIndex, regVal);
        return regVal;
    }
 
    RegVal
    readCCReg(RegIndex reg_idx) const override
    {
        int flatIndex = isa->flattenCCIndex(reg_idx);
        assert(0 <= flatIndex);
        assert(flatIndex < ccRegs.size());
        uint64_t regVal(readCCRegFlat(flatIndex));
        DPRINTF(CCRegs, "Reading CC reg %d (%d) as %#x.\n",
                reg_idx, flatIndex, regVal);
        return regVal;
    }
 
    void
    setIntReg(RegIndex reg_idx, RegVal val) override
    {
        int flatIndex = isa->flattenIntIndex(reg_idx);
        assert(flatIndex < intRegs.size());
        DPRINTF(IntRegs, "Setting int reg %d (%d) to %#x.\n",
                reg_idx, flatIndex, val);
        setIntRegFlat(flatIndex, val);
    }
 
    void
    setFloatReg(RegIndex reg_idx, RegVal val) override
    {
        int flatIndex = isa->flattenFloatIndex(reg_idx);
        assert(flatIndex < floatRegs.size());
        // XXX: Fix array out of bounds compiler error for gem5.fast
        // when checkercpu enabled
        if (flatIndex < floatRegs.size())
            setFloatRegFlat(flatIndex, val);
        DPRINTF(FloatRegs, "Setting float reg %d (%d) bits to %#x.\n",
                reg_idx, flatIndex, val);
    }
 
    void
    setVecReg(const RegId &reg, const TheISA::VecRegContainer &val) override
    {
        int flatIndex = isa->flattenVecIndex(reg.index());
        assert(flatIndex < vecRegs.size());
        setVecRegFlat(flatIndex, val);
        DPRINTF(VecRegs, "Setting vector reg %d (%d) to %s.\n",
                reg.index(), flatIndex, val);
    }
 
    void
    setVecElem(const RegId &reg, RegVal val) override
    {
        int flatIndex = isa->flattenVecElemIndex(reg.index());
        assert(flatIndex < vecRegs.size());
        setVecElemFlat(flatIndex, reg.elemIndex(), val);
        DPRINTF(VecRegs, "Setting element %d of vector reg %d (%d) to"
                " %#x.\n", reg.elemIndex(), reg.index(), flatIndex, val);
    }
 
    void
    setVecPredReg(const RegId &reg,
            const TheISA::VecPredRegContainer &val) override
    {
        int flatIndex = isa->flattenVecPredIndex(reg.index());
        assert(flatIndex < vecPredRegs.size());
        setVecPredRegFlat(flatIndex, val);
        DPRINTF(VecPredRegs, "Setting predicate reg %d (%d) to %s.\n",
                reg.index(), flatIndex, val);
    }
 
    void
    setCCReg(RegIndex reg_idx, RegVal val) override
    {
        int flatIndex = isa->flattenCCIndex(reg_idx);
        assert(flatIndex < ccRegs.size());
        DPRINTF(CCRegs, "Setting CC reg %d (%d) to %#x.\n",
                reg_idx, flatIndex, val);
        setCCRegFlat(flatIndex, val);
    }
 
    const PCStateBase &pcState() const override { return *_pcState; }
    void pcState(const PCStateBase &val) override { set(_pcState, val); }
 
    void
    pcStateNoRecord(const PCStateBase &val) override
    {
        set(_pcState, val);
    }
 
    bool readPredicate() const { return predicate; }
    void setPredicate(bool val) { predicate = val; }
 
    RegVal
    readMiscRegNoEffect(RegIndex misc_reg) const override
    {
        return isa->readMiscRegNoEffect(misc_reg);
    }
 
    RegVal
    readMiscReg(RegIndex misc_reg) override
    {
        return isa->readMiscReg(misc_reg);
    }
 
    void
    setMiscRegNoEffect(RegIndex misc_reg, RegVal val) override
    {
        return isa->setMiscRegNoEffect(misc_reg, val);
    }
 
    void
    setMiscReg(RegIndex misc_reg, RegVal val) override
    {
        return isa->setMiscReg(misc_reg, val);
    }
 
    RegId
    flattenRegId(const RegId& regId) const override
    {
        return isa->flattenRegId(regId);
    }
 
    unsigned readStCondFailures() const override { return storeCondFailures; }
 
    bool
    readMemAccPredicate()
    {
        return memAccPredicate;
    }
 
    void
    setMemAccPredicate(bool val)
    {
        memAccPredicate = val;
    }
 
    void
    setStCondFailures(unsigned sc_failures) override
    {
        storeCondFailures = sc_failures;
    }
 
    RegVal readIntRegFlat(RegIndex idx) const override { return intRegs[idx]; }
    void
    setIntRegFlat(RegIndex idx, RegVal val) override
    {
        intRegs[idx] = val;
    }
 
    RegVal
    readFloatRegFlat(RegIndex idx) const override
    {
        return floatRegs[idx];
    }
    void
    setFloatRegFlat(RegIndex idx, RegVal val) override
    {
        floatRegs[idx] = val;
    }
 
    const TheISA::VecRegContainer &
    readVecRegFlat(RegIndex reg) const override
    {
        return vecRegs[reg];
    }
 
    TheISA::VecRegContainer &
    getWritableVecRegFlat(RegIndex reg) override
    {
        return vecRegs[reg];
    }
 
    void
    setVecRegFlat(RegIndex reg, const TheISA::VecRegContainer &val) override
    {
        vecRegs[reg] = val;
    }
 
    RegVal
    readVecElemFlat(RegIndex reg, const ElemIndex &elemIndex) const override
    {
        return vecElemRegs[reg * TheISA::NumVecElemPerVecReg + elemIndex];
    }
 
    void
    setVecElemFlat(RegIndex reg, const ElemIndex &elemIndex,
                   RegVal val) override
    {
        vecElemRegs[reg * TheISA::NumVecElemPerVecReg + elemIndex] = val;
    }
 
    const TheISA::VecPredRegContainer &
    readVecPredRegFlat(RegIndex reg) const override
    {
        return vecPredRegs[reg];
    }
 
    TheISA::VecPredRegContainer &
    getWritableVecPredRegFlat(RegIndex reg) override
    {
        return vecPredRegs[reg];
    }
 
    void
    setVecPredRegFlat(RegIndex reg,
            const TheISA::VecPredRegContainer &val) override
    {
        vecPredRegs[reg] = val;
    }
 
    RegVal readCCRegFlat(RegIndex idx) const override { return ccRegs[idx]; }
    void setCCRegFlat(RegIndex idx, RegVal val) override { ccRegs[idx] = val; }
 
    // hardware transactional memory
    void htmAbortTransaction(uint64_t htm_uid,
                             HtmFailureFaultCause cause) override;
 
    BaseHTMCheckpointPtr& getHtmCheckpointPtr() override;
    void setHtmCheckpointPtr(BaseHTMCheckpointPtr new_cpt) override;
};
 
} // namespace gem5
 
#endif // __CPU_SIMPLE_THREAD_HH__