tlb.hh

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 * Authors: Ali Saidi
 */

#ifndef __ARCH_ARM_TLB_HH__
#define __ARCH_ARM_TLB_HH__


#include "arch/arm/isa_traits.hh"
#include "arch/arm/pagetable.hh"
#include "arch/arm/utility.hh"
#include "arch/arm/vtophys.hh"
#include "arch/generic/tlb.hh"
#include "base/statistics.hh"
#include "mem/request.hh"
#include "params/ArmTLB.hh"
#include "sim/probe/pmu.hh"

class ThreadContext;

namespace ArmISA {

class TableWalker;
class Stage2LookUp;
class Stage2MMU;
class TLB;

class TlbTestInterface
{
  public:
    TlbTestInterface() {}
    virtual ~TlbTestInterface() {}

    virtual Fault translationCheck(RequestPtr req, bool is_priv,
                                   BaseTLB::Mode mode,
                                   TlbEntry::DomainType domain) = 0;

    virtual Fault walkCheck(Addr pa, Addr size, Addr va, bool is_secure,
                            Addr is_priv, BaseTLB::Mode mode,
                            TlbEntry::DomainType domain,
                            LookupLevel lookup_level) = 0;
};

class TLB : public BaseTLB
{
  public:
    enum ArmFlags {
        AlignmentMask = 0x7,

        AlignByte = 0x0,
        AlignHalfWord = 0x1,
        AlignWord = 0x2,
        AlignDoubleWord = 0x3,
        AlignQuadWord = 0x4,
        AlignOctWord = 0x5,

        AllowUnaligned = 0x8,
        // Priv code operating as if it wasn't
        UserMode = 0x10,
        // Because zero otherwise looks like a valid setting and may be used
        // accidentally, this bit must be non-zero to show it was used on
        // purpose.
        MustBeOne = 0x40
    };

    enum ArmTranslationType {
        NormalTran = 0,
        S1CTran = 0x1,
        HypMode = 0x2,
        // Secure code operating as if it wasn't (required by some Address
        // Translate operations)
        S1S2NsTran = 0x4,
        // Address translation instructions (eg AT S1E0R_Xt) need to be handled
        // in special ways during translation because they could need to act
        // like a different EL than the current EL. The following flags are
        // for these instructions
        S1E0Tran = 0x8,
        S1E1Tran = 0x10,
        S1E2Tran = 0x20,
        S1E3Tran = 0x40,
        S12E0Tran = 0x80,
        S12E1Tran = 0x100
    };
  protected:
    TlbEntry* table;     // the Page Table
    int size;            // TLB Size
    bool isStage2;       // Indicates this TLB is part of the second stage MMU
    bool stage2Req;      // Indicates whether a stage 2 lookup is also required
    uint64_t _attr;      // Memory attributes for last accessed TLB entry
    bool directToStage2; // Indicates whether all translation requests should
                         // be routed directly to the stage 2 TLB

    TableWalker *tableWalker;
    TLB *stage2Tlb;
    Stage2MMU *stage2Mmu;

    TlbTestInterface *test;

    // Access Stats
    mutable Stats::Scalar instHits;
    mutable Stats::Scalar instMisses;
    mutable Stats::Scalar readHits;
    mutable Stats::Scalar readMisses;
    mutable Stats::Scalar writeHits;
    mutable Stats::Scalar writeMisses;
    mutable Stats::Scalar inserts;
    mutable Stats::Scalar flushTlb;
    mutable Stats::Scalar flushTlbMva;
    mutable Stats::Scalar flushTlbMvaAsid;
    mutable Stats::Scalar flushTlbAsid;
    mutable Stats::Scalar flushedEntries;
    mutable Stats::Scalar alignFaults;
    mutable Stats::Scalar prefetchFaults;
    mutable Stats::Scalar domainFaults;
    mutable Stats::Scalar permsFaults;

    Stats::Formula readAccesses;
    Stats::Formula writeAccesses;
    Stats::Formula instAccesses;
    Stats::Formula hits;
    Stats::Formula misses;
    Stats::Formula accesses;

    ProbePoints::PMUUPtr ppRefills;

    int rangeMRU; //On lookup, only move entries ahead when outside rangeMRU

  public:
    TLB(const ArmTLBParams *p);
    TLB(const Params *p, int _size, TableWalker *_walker);

    TlbEntry *lookup(Addr vpn, uint16_t asn, uint8_t vmid, bool hyp,
                     bool secure, bool functional,
                     bool ignore_asn, uint8_t target_el);

    virtual ~TLB();

    void takeOverFrom(BaseTLB *otlb) override;

    void init() override;

    void setTestInterface(SimObject *ti);

    TableWalker *getTableWalker() { return tableWalker; }

    void setMMU(Stage2MMU *m, MasterID master_id);

    int getsize() const { return size; }

    void insert(Addr vaddr, TlbEntry &pte);

    Fault getTE(TlbEntry **te, RequestPtr req, ThreadContext *tc, Mode mode,
                Translation *translation, bool timing, bool functional,
                bool is_secure, ArmTranslationType tranType);

    Fault getResultTe(TlbEntry **te, RequestPtr req, ThreadContext *tc,
                      Mode mode, Translation *translation, bool timing,
                      bool functional, TlbEntry *mergeTe);

    Fault checkPermissions(TlbEntry *te, RequestPtr req, Mode mode);
    Fault checkPermissions64(TlbEntry *te, RequestPtr req, Mode mode,
                             ThreadContext *tc);


    void flushAllSecurity(bool secure_lookup, uint8_t target_el,
                          bool ignore_el = false);

    void flushAllNs(bool hyp, uint8_t target_el, bool ignore_el = false);


    void flushAll() override
    {
        flushAllSecurity(false, 0, true);
        flushAllSecurity(true, 0, true);
    }

    void flushMvaAsid(Addr mva, uint64_t asn, bool secure_lookup,
                      uint8_t target_el);

    void flushAsid(uint64_t asn, bool secure_lookup, uint8_t target_el);

    void flushMva(Addr mva, bool secure_lookup, bool hyp, uint8_t target_el);

    void flushIpaVmid(Addr ipa, bool secure_lookup, bool hyp, uint8_t target_el);

    Fault trickBoxCheck(RequestPtr req, Mode mode, TlbEntry::DomainType domain);
    Fault walkTrickBoxCheck(Addr pa, bool is_secure, Addr va, Addr sz, bool is_exec,
            bool is_write, TlbEntry::DomainType domain, LookupLevel lookup_level);

    void printTlb() const;

    void demapPage(Addr vaddr, uint64_t asn) override
    {
        // needed for x86 only
        panic("demapPage() is not implemented.\n");
    }

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

    Fault translateFunctional(RequestPtr req, ThreadContext *tc, Mode mode,
            ArmTranslationType tranType = NormalTran);

    void
    setAttr(uint64_t attr)
    {
        _attr = attr;
    }

    uint64_t
    getAttr() const
    {
        return _attr;
    }

    Fault translateFs(RequestPtr req, ThreadContext *tc, Mode mode,
            Translation *translation, bool &delay,
            bool timing, ArmTranslationType tranType, bool functional = false);
    Fault translateSe(RequestPtr req, ThreadContext *tc, Mode mode,
            Translation *translation, bool &delay, bool timing);
    Fault translateAtomic(RequestPtr req, ThreadContext *tc, Mode mode,
            ArmTranslationType tranType = NormalTran);
    Fault translateTiming(RequestPtr req, ThreadContext *tc,
            Translation *translation, Mode mode,
            ArmTranslationType tranType = NormalTran);
    Fault translateComplete(RequestPtr req, ThreadContext *tc,
            Translation *translation, Mode mode, ArmTranslationType tranType,
            bool callFromS2);
    Fault finalizePhysical(RequestPtr req, ThreadContext *tc, Mode mode) const;

    void drainResume() override;

    // Checkpointing
    void serialize(CheckpointOut &cp) const override;
    void unserialize(CheckpointIn &cp) override;

    void regStats() override;

    void regProbePoints() override;

    BaseMasterPort* getMasterPort() override;

    // Caching misc register values here.
    // Writing to misc registers needs to invalidate them.
    // translateFunctional/translateSe/translateFs checks if they are
    // invalid and call updateMiscReg if necessary.
protected:
    CPSR cpsr;
    bool aarch64;
    ExceptionLevel aarch64EL;
    SCTLR sctlr;
    SCR scr;
    bool isPriv;
    bool isSecure;
    bool isHyp;
    TTBCR ttbcr;
    uint16_t asid;
    uint8_t vmid;
    PRRR prrr;
    NMRR nmrr;
    HCR hcr;
    uint32_t dacr;
    bool miscRegValid;
    ContextID miscRegContext;
    ArmTranslationType curTranType;

    // Cached copies of system-level properties
    bool haveLPAE;
    bool haveVirtualization;
    bool haveLargeAsid64;

    AddrRange m5opRange;

    void updateMiscReg(ThreadContext *tc,
                       ArmTranslationType tranType = NormalTran);

public:
    const Params *
    params() const
    {
        return dynamic_cast<const Params *>(_params);
    }
    inline void invalidateMiscReg() { miscRegValid = false; }

private:
    void _flushMva(Addr mva, uint64_t asn, bool secure_lookup,
                   bool hyp, bool ignore_asn, uint8_t target_el);

    bool checkELMatch(uint8_t target_el, uint8_t tentry_el, bool ignore_el);

  public: /* Testing */
    Fault testTranslation(RequestPtr req, Mode mode,
                          TlbEntry::DomainType domain);
    Fault testWalk(Addr pa, Addr size, Addr va, bool is_secure, Mode mode,
                   TlbEntry::DomainType domain,
                   LookupLevel lookup_level);
};

} // namespace ArmISA

#endif // __ARCH_ARM_TLB_HH__