src/arch/arm/mmu.hh

/*
 * Copyright (c) 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
 * unmodified and in its entirety in all distributions of the software,
 * modified or unmodified, in source code or in binary form.
 *
 * 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
 * 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
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 */

#ifndef __ARCH_ARM_MMU_HH__
#define __ARCH_ARM_MMU_HH__

#include "arch/arm/tlb.hh"
#include "arch/generic/mmu.hh"

#include "params/ArmMMU.hh"

namespace gem5
{

namespace ArmISA {

class MMU : public BaseMMU
{
  protected:
    ArmISA::TLB *
    getDTBPtr() const
    {
        return static_cast<ArmISA::TLB *>(dtb);
    }

    ArmISA::TLB *
    getITBPtr() const
    {
        return static_cast<ArmISA::TLB *>(itb);
    }

    TLB * getTlb(BaseMMU::Mode mode, bool stage2) const;

  protected:
    TLB *itbStage2;
    TLB *dtbStage2;

    TableWalker *itbWalker;
    TableWalker *dtbWalker;
    TableWalker *itbStage2Walker;
    TableWalker *dtbStage2Walker;

  public:
    enum TLBType
    {
        I_TLBS = 0x01,
        D_TLBS = 0x10,
        ALL_TLBS = 0x11
    };

    MMU(const ArmMMUParams &p);

    void init() override;

    bool translateFunctional(ThreadContext *tc, Addr vaddr, Addr &paddr);

    Fault translateFunctional(const RequestPtr &req, ThreadContext *tc,
        BaseMMU::Mode mode, TLB::ArmTranslationType tran_type);

    Fault translateFunctional(const RequestPtr &req, ThreadContext *tc,
        BaseMMU::Mode mode, TLB::ArmTranslationType tran_type,
        bool stage2);

    using BaseMMU::translateAtomic;
    Fault translateAtomic(const RequestPtr &req, ThreadContext *tc,
        BaseMMU::Mode mode, bool stage2);

    void translateTiming(const RequestPtr &req, ThreadContext *tc,
        BaseMMU::Translation *translation, BaseMMU::Mode mode, bool stage2);

    void invalidateMiscReg(TLBType type = ALL_TLBS);

    template <typename OP>
    void
    flush(const OP &tlbi_op)
    {
        if (tlbi_op.stage1Flush()) {
            flushStage1(tlbi_op);
        }

        if (tlbi_op.stage2Flush()) {
            flushStage2(tlbi_op.makeStage2());
        }
    }

    template <typename OP>
    void
    flushStage1(const OP &tlbi_op)
    {
        iflush(tlbi_op);
        dflush(tlbi_op);
    }

    template <typename OP>
    void
    flushStage2(const OP &tlbi_op)
    {
        itbStage2->flush(tlbi_op);
        dtbStage2->flush(tlbi_op);
    }

    template <typename OP>
    void
    iflush(const OP &tlbi_op)
    {
        getITBPtr()->flush(tlbi_op);
    }

    template <typename OP>
    void
    dflush(const OP &tlbi_op)
    {
        getDTBPtr()->flush(tlbi_op);
    }

    void
    flushAll() override
    {
        BaseMMU::flushAll();
        itbStage2->flushAll();
        dtbStage2->flushAll();
    }

    uint64_t
    getAttr() const
    {
        return getDTBPtr()->getAttr();
    }
};

template<typename T>
MMU *
getMMUPtr(T *tc)
{
    auto mmu = static_cast<MMU *>(tc->getMMUPtr());
    assert(mmu);
    return mmu;
}

} // namespace ArmISA
} // namespace gem5

#endif // __ARCH_ARM_MMU_HH__