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 * Copyright (c) 2020-2021 ARM Limited
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 *
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 * property including but not limited to intellectual property relating
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 * licensed hereunder.  You may use the software subject to the license
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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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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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 */

#include "arch/arm/insts/tme64.hh"

#include <sstream>

#include "debug/ArmTme.hh"

namespace gem5
{

using namespace ArmISA;

namespace ArmISAInst {

std::string
TmeImmOp64::generateDisassembly(
    Addr pc, const loader::SymbolTable *symtab) const
{
    std::stringstream ss;
    printMnemonic(ss, "", false);
    ccprintf(ss, "#0x%x", imm);
    return ss.str();
}

std::string
TmeRegNone64::generateDisassembly(
    Addr pc, const loader::SymbolTable *symtab) const
{
    std::stringstream ss;
    printMnemonic(ss);
    printIntReg(ss, dest);
    return ss.str();
}

std::string
MicroTmeBasic64::generateDisassembly(
    Addr pc, const loader::SymbolTable *symtab) const
{
    std::stringstream ss;
    printMnemonic(ss);
    return ss.str();
}

MicroTfence64::MicroTfence64(ExtMachInst machInst)
    : MicroTmeBasic64("utfence", machInst, MemReadOp)
{
    _numSrcRegs = 0;
    _numDestRegs = 0;
    flags[IsMicroop] = true;
    flags[IsReadBarrier] = true;
    flags[IsWriteBarrier] = true;
}

Fault
MicroTfence64::execute(
    ExecContext *xc, trace::InstRecord *traceData) const
{
    return NoFault;
}

Fault
MicroTfence64::initiateAcc(ExecContext *xc,
                           trace::InstRecord *traceData) const
{
    panic("tfence should not have memory semantics");

    return NoFault;
}

Fault
MicroTfence64::completeAcc(PacketPtr pkt, ExecContext *xc,
                           trace::InstRecord *traceData) const
{
    panic("tfence should not have memory semantics");

    return NoFault;
}

Tstart64::Tstart64(ExtMachInst machInst, RegIndex _dest)
    : TmeRegNone64("tstart", machInst, MemReadOp, _dest)
{
    setRegIdxArrays(
        nullptr,
        reinterpret_cast<RegIdArrayPtr>(
            &std::remove_pointer_t<decltype(this)>::destRegIdxArr));
            ;

    _numSrcRegs = 0;
    _numDestRegs = 0;
    setDestRegIdx(_numDestRegs++, intRegClass[dest]);
    _numTypedDestRegs[IntRegClass]++;
    flags[IsHtmStart] = true;
    flags[IsInteger] = true;
    flags[IsLoad] = true;
    flags[IsMicroop] = true;
    flags[IsNonSpeculative] = true;
}

Fault
Tstart64::execute(
    ExecContext *xc, trace::InstRecord *traceData) const
{
    panic("TME is not supported with atomic memory");

    return NoFault;
}

Ttest64::Ttest64(ExtMachInst machInst, RegIndex _dest)
    : TmeRegNone64("ttest", machInst, MemReadOp, _dest)
{
    setRegIdxArrays(
        nullptr,
        reinterpret_cast<RegIdArrayPtr>(
            &std::remove_pointer_t<decltype(this)>::destRegIdxArr));
            ;

    _numSrcRegs = 0;
    _numDestRegs = 0;
    setDestRegIdx(_numDestRegs++, intRegClass[dest]);
    _numTypedDestRegs[IntRegClass]++;
    flags[IsInteger] = true;
    flags[IsMicroop] = true;
}

Tcancel64::Tcancel64(ExtMachInst machInst, uint64_t _imm)
    : TmeImmOp64("tcancel", machInst, MemReadOp, _imm)
{
    _numSrcRegs = 0;
    _numDestRegs = 0;
    flags[IsLoad] = true;
    flags[IsMicroop] = true;
    flags[IsNonSpeculative] = true;
    flags[IsHtmCancel] = true;
}

Fault
Tcancel64::execute(
    ExecContext *xc, trace::InstRecord *traceData) const
{
    panic("TME is not supported with atomic memory");

    return NoFault;
}

MacroTmeOp::MacroTmeOp(const char *mnem,
                       ExtMachInst _machInst,
                       OpClass __opClass) :
  PredMacroOp(mnem, machInst, __opClass) {
    _numSrcRegs = 0;
    _numDestRegs = 0;

    numMicroops = 0;
    microOps = nullptr;
}

MicroTcommit64::MicroTcommit64(ExtMachInst machInst)
    : MicroTmeBasic64("utcommit", machInst, MemReadOp)
{
    _numSrcRegs = 0;
    _numDestRegs = 0;
    flags[IsHtmStop] = true;
    flags[IsLoad] = true;
    flags[IsMicroop] = true;
    flags[IsNonSpeculative] = true;
}

Fault
MicroTcommit64::execute(ExecContext *xc, trace::InstRecord *traceData) const
{
    panic("TME is not supported with atomic memory");

    return NoFault;
}

Tcommit64::Tcommit64(ExtMachInst _machInst) :
                     MacroTmeOp("tcommit", machInst, MemReadOp)
{
    numMicroops = 2;
    microOps = new StaticInstPtr[numMicroops];

    microOps[0] = new ArmISAInst::MicroTfence64(_machInst);
    microOps[0]->setDelayedCommit();
    microOps[0]->setFirstMicroop();

    microOps[1] = new ArmISAInst::MicroTcommit64(_machInst);
    microOps[1]->setDelayedCommit();
    microOps[1]->setLastMicroop();
}

} // namespace ArmISAInst
} // namespace gem5