simple_thread.hh

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/*
 * Copyright (c) 2011-2012, 2016-2018, 2020 ARM Limited
 * Copyright (c) 2013 Advanced Micro Devices, Inc.
 * All rights reserved
 *
 * The license below extends only to copyright in the software and shall
 * not be construed as granting a license to any other intellectual
 * property including but not limited to intellectual property relating
 * to a hardware implementation of the functionality of the software
 * licensed hereunder.  You may use the software subject to the license
 * terms below provided that you ensure that this notice is replicated
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 * modified or unmodified, in source code or in binary form.
 *
 * Copyright (c) 2001-2006 The Regents of The University of Michigan
 * All rights reserved.
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 * 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;
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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 "base/logging.hh"
#include "base/types.hh"
#include "cpu/regfile.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::array<RegFile, CCRegClass + 1> regFiles;
 
    BaseISA *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() const 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());
        for (auto &rf: regFiles)
            rf.clear();
        isa->clear();
    }
 
    //
    // New accessors for new decoder.
    //
    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);
    }
 
    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
    getReg(const RegId &arch_reg) const override
    {
        const RegId reg = arch_reg.flatten(*isa);
 
        const RegIndex idx = reg.index();
 
        const auto &reg_file = regFiles[reg.classValue()];
        const auto &reg_class = reg_file.regClass;
 
        RegVal val = reg_file.reg(idx);
        DPRINTFV(reg_class.debug(), "Reading %s reg %s (%d) as %#x.\n",
                reg.className(), reg_class.regName(arch_reg), idx, val);
        return val;
    }
 
    void
    getReg(const RegId &arch_reg, void *val) const override
    {
        const RegId reg = arch_reg.flatten(*isa);
 
        const RegIndex idx = reg.index();
 
        const auto &reg_file = regFiles[reg.classValue()];
        const auto &reg_class = reg_file.regClass;
 
        reg_file.get(idx, val);
        DPRINTFV(reg_class.debug(), "Reading %s register %s (%d) as %s.\n",
                reg.className(), reg_class.regName(arch_reg), idx,
                reg_class.valString(val));
    }
 
    void *
    getWritableReg(const RegId &arch_reg) override
    {
        const RegId reg = arch_reg.flatten(*isa);
        const RegIndex idx = reg.index();
        auto &reg_file = regFiles[reg.classValue()];
 
        return reg_file.ptr(idx);
    }
 
    void
    setReg(const RegId &arch_reg, RegVal val) override
    {
        const RegId reg = arch_reg.flatten(*isa);
 
        if (reg.is(InvalidRegClass))
            return;
 
        const RegIndex idx = reg.index();
 
        auto &reg_file = regFiles[reg.classValue()];
        const auto &reg_class = reg_file.regClass;
 
        DPRINTFV(reg_class.debug(), "Setting %s register %s (%d) to %#x.\n",
                reg.className(), reg_class.regName(arch_reg), idx, val);
        reg_file.reg(idx) = val;
    }
 
    void
    setReg(const RegId &arch_reg, const void *val) override
    {
        const RegId reg = arch_reg.flatten(*isa);
 
        const RegIndex idx = reg.index();
 
        auto &reg_file = regFiles[reg.classValue()];
        const auto &reg_class = reg_file.regClass;
 
        DPRINTFV(reg_class.debug(), "Setting %s register %s (%d) to %s.\n",
                reg.className(), reg_class.regName(arch_reg), idx,
                reg_class.valString(val));
        reg_file.set(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__