/*
 * Copyright (c) 2018, 2020 ARM Limited
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 * 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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 * 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
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 * neither the name of the copyright holders nor the names of its
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 */

#include "cpu/simple_thread.hh"

#include <string>

#include "arch/utility.hh"
#include "base/callback.hh"
#include "base/compiler.hh"
#include "base/cprintf.hh"
#include "base/output.hh"
#include "base/trace.hh"
#include "config/the_isa.hh"
#include "cpu/base.hh"
#include "cpu/simple/base.hh"
#include "cpu/thread_context.hh"
#include "mem/se_translating_port_proxy.hh"
#include "mem/translating_port_proxy.hh"
#include "params/BaseCPU.hh"
#include "sim/faults.hh"
#include "sim/full_system.hh"
#include "sim/process.hh"
#include "sim/serialize.hh"
#include "sim/sim_exit.hh"
#include "sim/system.hh"

// constructor
SimpleThread::SimpleThread(BaseCPU *_cpu, int _thread_num, System *_sys,
                           Process *_process, BaseMMU *_mmu,
                           BaseISA *_isa)
    : ThreadState(_cpu, _thread_num, _process),
      isa(dynamic_cast<TheISA::ISA *>(_isa)),
      predicate(true), memAccPredicate(true),
      comInstEventQueue("instruction-based event queue"),
      system(_sys), mmu(_mmu), decoder(isa),
      htmTransactionStarts(0), htmTransactionStops(0)
{
    assert(isa);
    clearArchRegs();
}

SimpleThread::SimpleThread(BaseCPU *_cpu, int _thread_num, System *_sys,
                           BaseMMU *_mmu, BaseISA *_isa)
    : ThreadState(_cpu, _thread_num, NULL),
      isa(dynamic_cast<TheISA::ISA *>(_isa)),
      predicate(true), memAccPredicate(true),
      comInstEventQueue("instruction-based event queue"),
      system(_sys), mmu(_mmu), decoder(isa),
      htmTransactionStarts(0), htmTransactionStops(0)
{
    assert(isa);

    clearArchRegs();
}

void
SimpleThread::takeOverFrom(ThreadContext *oldContext)
{
    ::takeOverFrom(*this, *oldContext);
    decoder.takeOverFrom(oldContext->getDecoderPtr());

    isa->takeOverFrom(this, oldContext);

    funcExeInst = oldContext->readFuncExeInst();
    storeCondFailures = 0;
}

void
SimpleThread::copyState(ThreadContext *oldContext)
{
    // copy over functional state
    _status = oldContext->status();
    copyArchRegs(oldContext);
    if (FullSystem)
        funcExeInst = oldContext->readFuncExeInst();

    _threadId = oldContext->threadId();
    _contextId = oldContext->contextId();
}

void
SimpleThread::serialize(CheckpointOut &cp) const
{
    ThreadState::serialize(cp);
    ::serialize(*this, cp);
}


void
SimpleThread::unserialize(CheckpointIn &cp)
{
    ThreadState::unserialize(cp);
    ::unserialize(*this, cp);
}

void
SimpleThread::activate()
{
    if (status() == ThreadContext::Active)
        return;

    lastActivate = curTick();
    _status = ThreadContext::Active;
    baseCpu->activateContext(_threadId);
}

void
SimpleThread::suspend()
{
    if (status() == ThreadContext::Suspended)
        return;

    lastActivate = curTick();
    lastSuspend = curTick();
    _status = ThreadContext::Suspended;
    baseCpu->suspendContext(_threadId);
}


void
SimpleThread::halt()
{
    if (status() == ThreadContext::Halted)
        return;

    _status = ThreadContext::Halted;
    baseCpu->haltContext(_threadId);
}

void
SimpleThread::copyArchRegs(ThreadContext *src_tc)
{
    TheISA::copyRegs(src_tc, this);
}

// hardware transactional memory
void
SimpleThread::htmAbortTransaction(uint64_t htm_uid, HtmFailureFaultCause cause)
{
    BaseSimpleCPU *baseSimpleCpu = dynamic_cast<BaseSimpleCPU*>(baseCpu);
    assert(baseSimpleCpu);

    baseSimpleCpu->htmSendAbortSignal(cause);

    // these must be reset after the abort signal has been sent
    htmTransactionStarts = 0;
    htmTransactionStops = 0;
}

BaseHTMCheckpointPtr&
SimpleThread::getHtmCheckpointPtr()
{
    return _htmCheckpoint;
}

void
SimpleThread::setHtmCheckpointPtr(BaseHTMCheckpointPtr new_cpt)
{
    _htmCheckpoint = std::move(new_cpt);
}