gem5  v21.2.0.0
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gem5::ArmISA::TLB Class Reference

#include <tlb.hh>

Inheritance diagram for gem5::ArmISA::TLB:
gem5::BaseTLB gem5::SimObject gem5::EventManager gem5::Serializable gem5::Drainable gem5::statistics::Group gem5::Named

Classes

struct  TlbStats
 

Public Types

using Params = ArmTLBParams
 
using Lookup = TlbEntry::Lookup
 
using LookupLevel = enums::ArmLookupLevel
 
- Public Types inherited from gem5::SimObject
typedef SimObjectParams Params
 

Public Member Functions

 TLB (const Params &p)
 
 TLB (const Params &p, int _size, TableWalker *_walker)
 
TlbEntrylookup (const Lookup &lookup_data)
 Lookup an entry in the TLB. More...
 
TlbEntrymultiLookup (const Lookup &lookup_data)
 Lookup an entry in the TLB and in the next levels by following the nextLevel pointer. More...
 
virtual ~TLB ()
 
void takeOverFrom (BaseTLB *otlb) override
 Take over from an old tlb context. More...
 
void setTableWalker (TableWalker *table_walker)
 
TableWalkergetTableWalker ()
 
int getsize () const
 
bool walkCache () const
 
void setVMID (vmid_t _vmid)
 
void insert (TlbEntry &pte)
 Insert a PTE in the current TLB. More...
 
void multiInsert (TlbEntry &pte)
 Insert a PTE in the current TLB and in the higher levels. More...
 
void flushAll () override
 Reset the entire TLB. More...
 
void flush (const TLBIALL &tlbi_op)
 Reset the entire TLB. More...
 
void flush (const ITLBIALL &tlbi_op)
 
void flush (const DTLBIALL &tlbi_op)
 
void flush (const TLBIALLEL &tlbi_op)
 Implementaton of AArch64 TLBI ALLE1(IS), ALLE2(IS), ALLE3(IS) instructions. More...
 
void flush (const TLBIVMALL &tlbi_op)
 Implementaton of AArch64 TLBI VMALLE1(IS)/VMALLS112E1(IS) instructions. More...
 
void flush (const TLBIALLN &tlbi_op)
 Remove all entries in the non secure world, depending on whether they were allocated in hyp mode or not. More...
 
void flush (const TLBIMVA &tlbi_op)
 Remove any entries that match both a va and asn. More...
 
void flush (const ITLBIMVA &tlbi_op)
 
void flush (const DTLBIMVA &tlbi_op)
 
void flush (const TLBIASID &tlbi_op)
 Remove any entries that match the asn. More...
 
void flush (const ITLBIASID &tlbi_op)
 
void flush (const DTLBIASID &tlbi_op)
 
void flush (const TLBIMVAA &tlbi_op)
 Remove all entries that match the va regardless of asn. More...
 
Fault trickBoxCheck (const RequestPtr &req, BaseMMU::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
 
Fault translateAtomic (const RequestPtr &req, ThreadContext *tc, BaseMMU::Mode mode) override
 
void translateTiming (const RequestPtr &req, ThreadContext *tc, BaseMMU::Translation *translation, BaseMMU::Mode mode) override
 
Fault finalizePhysical (const RequestPtr &req, ThreadContext *tc, BaseMMU::Mode mode) const override
 Do post-translation physical address finalization. More...
 
void regProbePoints () override
 Register probe points for this object. More...
 
PortgetTableWalkerPort () override
 Get the table walker port. More...
 
- Public Member Functions inherited from gem5::BaseTLB
virtual Fault translateFunctional (const RequestPtr &req, ThreadContext *tc, BaseMMU::Mode mode)
 
void memInvalidate ()
 Invalidate the contents of memory buffers. More...
 
TypeTLB type () const
 
BaseTLBnextLevel () const
 
- Public Member Functions inherited from gem5::SimObject
const Paramsparams () const
 
 SimObject (const Params &p)
 
virtual ~SimObject ()
 
virtual void init ()
 init() is called after all C++ SimObjects have been created and all ports are connected. More...
 
virtual void loadState (CheckpointIn &cp)
 loadState() is called on each SimObject when restoring from a checkpoint. More...
 
virtual void initState ()
 initState() is called on each SimObject when not restoring from a checkpoint. More...
 
virtual void regProbeListeners ()
 Register probe listeners for this object. More...
 
ProbeManagergetProbeManager ()
 Get the probe manager for this object. More...
 
virtual PortgetPort (const std::string &if_name, PortID idx=InvalidPortID)
 Get a port with a given name and index. More...
 
virtual void startup ()
 startup() is the final initialization call before simulation. More...
 
DrainState drain () override
 Provide a default implementation of the drain interface for objects that don't need draining. More...
 
virtual void memWriteback ()
 Write back dirty buffers to memory using functional writes. More...
 
void serialize (CheckpointOut &cp) const override
 Serialize an object. More...
 
void unserialize (CheckpointIn &cp) override
 Unserialize an object. More...
 
- Public Member Functions inherited from gem5::EventManager
EventQueueeventQueue () const
 
void schedule (Event &event, Tick when)
 
void deschedule (Event &event)
 
void reschedule (Event &event, Tick when, bool always=false)
 
void schedule (Event *event, Tick when)
 
void deschedule (Event *event)
 
void reschedule (Event *event, Tick when, bool always=false)
 
void wakeupEventQueue (Tick when=(Tick) -1)
 This function is not needed by the usual gem5 event loop but may be necessary in derived EventQueues which host gem5 on other schedulers. More...
 
void setCurTick (Tick newVal)
 
 EventManager (EventManager &em)
 Event manger manages events in the event queue. More...
 
 EventManager (EventManager *em)
 
 EventManager (EventQueue *eq)
 
- Public Member Functions inherited from gem5::Serializable
 Serializable ()
 
virtual ~Serializable ()
 
void serializeSection (CheckpointOut &cp, const char *name) const
 Serialize an object into a new section. More...
 
void serializeSection (CheckpointOut &cp, const std::string &name) const
 
void unserializeSection (CheckpointIn &cp, const char *name)
 Unserialize an a child object. More...
 
void unserializeSection (CheckpointIn &cp, const std::string &name)
 
- Public Member Functions inherited from gem5::Drainable
DrainState drainState () const
 Return the current drain state of an object. More...
 
virtual void notifyFork ()
 Notify a child process of a fork. More...
 
- Public Member Functions inherited from gem5::statistics::Group
 Group (Group *parent, const char *name=nullptr)
 Construct a new statistics group. More...
 
virtual ~Group ()
 
virtual void regStats ()
 Callback to set stat parameters. More...
 
virtual void resetStats ()
 Callback to reset stats. More...
 
virtual void preDumpStats ()
 Callback before stats are dumped. More...
 
void addStat (statistics::Info *info)
 Register a stat with this group. More...
 
const std::map< std::string, Group * > & getStatGroups () const
 Get all child groups associated with this object. More...
 
const std::vector< Info * > & getStats () const
 Get all stats associated with this object. More...
 
void addStatGroup (const char *name, Group *block)
 Add a stat block as a child of this block. More...
 
const InforesolveStat (std::string name) const
 Resolve a stat by its name within this group. More...
 
void mergeStatGroup (Group *block)
 Merge the contents (stats & children) of a block to this block. More...
 
 Group ()=delete
 
 Group (const Group &)=delete
 
Groupoperator= (const Group &)=delete
 
- Public Member Functions inherited from gem5::Named
 Named (const std::string &name_)
 
virtual ~Named ()=default
 
virtual std::string name () const
 

Protected Attributes

TlbEntrytable
 
int size
 TLB Size. More...
 
bool isStage2
 Indicates this TLB caches IPA->PA translations. More...
 
std::unordered_map< enums::ArmLookupLevel, bool > partialLevels
 Hash map containing one entry per lookup level The TLB is caching partial translations from the key lookup level if the matching value is true. More...
 
bool _walkCache
 True if the TLB caches partial translations. More...
 
TableWalkertableWalker
 
gem5::ArmISA::TLB::TlbStats stats
 
probing::PMUUPtr ppRefills
 PMU probe for TLB refills. More...
 
int rangeMRU
 
vmid_t vmid
 
- Protected Attributes inherited from gem5::BaseTLB
TypeTLB _type
 
BaseTLB_nextLevel
 
- Protected Attributes inherited from gem5::SimObject
const SimObjectParams & _params
 Cached copy of the object parameters. More...
 
- Protected Attributes inherited from gem5::EventManager
EventQueueeventq
 A pointer to this object's event queue. More...
 

Private Member Functions

void _flushMva (Addr mva, uint64_t asn, bool secure_lookup, bool ignore_asn, ExceptionLevel target_el, bool in_host, TypeTLB entry_type)
 Remove any entries that match both a va and asn. More...
 
void checkPromotion (TlbEntry *entry, BaseMMU::Mode mode)
 Check if the tlb entry passed as an argument needs to be "promoted" as a unified entry: this should happen if we are hitting an instruction TLB entry on a data access or a data TLB entry on an instruction access: More...
 
TlbEntrymatch (const Lookup &lookup_data)
 Helper function looking up for a matching TLB entry Does not update stats; see lookup method instead. More...
 

Additional Inherited Members

- Static Public Member Functions inherited from gem5::SimObject
static void serializeAll (const std::string &cpt_dir)
 Create a checkpoint by serializing all SimObjects in the system. More...
 
static SimObjectfind (const char *name)
 Find the SimObject with the given name and return a pointer to it. More...
 
static void setSimObjectResolver (SimObjectResolver *resolver)
 There is a single object name resolver, and it is only set when simulation is restoring from checkpoints. More...
 
static SimObjectResolvergetSimObjectResolver ()
 There is a single object name resolver, and it is only set when simulation is restoring from checkpoints. More...
 
- Static Public Member Functions inherited from gem5::Serializable
static const std::string & currentSection ()
 Gets the fully-qualified name of the active section. More...
 
static void generateCheckpointOut (const std::string &cpt_dir, std::ofstream &outstream)
 Generate a checkpoint file so that the serialization can be routed to it. More...
 
- Protected Member Functions inherited from gem5::BaseTLB
 BaseTLB (const BaseTLBParams &p)
 
- Protected Member Functions inherited from gem5::Drainable
 Drainable ()
 
virtual ~Drainable ()
 
virtual void drainResume ()
 Resume execution after a successful drain. More...
 
void signalDrainDone () const
 Signal that an object is drained. More...
 

Detailed Description

Definition at line 115 of file tlb.hh.

Member Typedef Documentation

◆ Lookup

Definition at line 177 of file tlb.hh.

◆ LookupLevel

using gem5::ArmISA::TLB::LookupLevel = enums::ArmLookupLevel

Definition at line 178 of file tlb.hh.

◆ Params

using gem5::ArmISA::TLB::Params = ArmTLBParams

Definition at line 176 of file tlb.hh.

Constructor & Destructor Documentation

◆ TLB() [1/2]

gem5::TLB::TLB ( const Params p)

Definition at line 61 of file tlb.cc.

References _walkCache, gem5::MipsISA::p, and partialLevels.

◆ TLB() [2/2]

gem5::ArmISA::TLB::TLB ( const Params p,
int  _size,
TableWalker _walker 
)

◆ ~TLB()

gem5::TLB::~TLB ( )
virtual

Definition at line 93 of file tlb.cc.

References table.

Member Function Documentation

◆ _flushMva()

void gem5::TLB::_flushMva ( Addr  mva,
uint64_t  asn,
bool  secure_lookup,
bool  ignore_asn,
ExceptionLevel  target_el,
bool  in_host,
TypeTLB  entry_type 
)
private

Remove any entries that match both a va and asn.

Parameters
mvavirtual address to flush
asncontextid/asn to flush on match
secure_lookupif the operation affects the secure world
ignore_asnif the flush should ignore the asn
in_hostif hcr.e2h == 1 and hcr.tge == 1 for VHE.
entry_typetype of entry to flush (instruction/data/unified)

Definition at line 597 of file tlb.cc.

References gem5::ArmISA::TlbEntry::Lookup::asn, DPRINTF, gem5::ArmISA::EL2, gem5::ArmISA::TLB::TlbStats::flushedEntries, gem5::ArmISA::TlbEntry::Lookup::functional, gem5::ArmISA::TlbEntry::Lookup::hyp, gem5::ArmISA::TlbEntry::Lookup::ignoreAsn, gem5::ArmISA::TlbEntry::Lookup::inHost, lookup(), gem5::ArmISA::TlbEntry::Lookup::mode, gem5::BaseMMU::Read, gem5::ArmISA::TlbEntry::Lookup::secure, stats, gem5::ArmISA::TlbEntry::Lookup::targetEL, gem5::ArmISA::te, gem5::ArmISA::TlbEntry::Lookup::va, vmid, and gem5::ArmISA::TlbEntry::Lookup::vmid.

Referenced by flush().

◆ checkPromotion()

void gem5::TLB::checkPromotion ( TlbEntry entry,
BaseMMU::Mode  mode 
)
private

Check if the tlb entry passed as an argument needs to be "promoted" as a unified entry: this should happen if we are hitting an instruction TLB entry on a data access or a data TLB entry on an instruction access:

Definition at line 227 of file tlb.cc.

References data, gem5::BaseMMU::Execute, gem5::ArmISA::mode, and gem5::ArmISA::TlbEntry::type.

Referenced by multiLookup().

◆ demapPage()

void gem5::TLB::demapPage ( Addr  vaddr,
uint64_t  asn 
)
inlineoverridevirtual

Implements gem5::BaseTLB.

Definition at line 269 of file tlb.hh.

References panic.

◆ finalizePhysical()

Fault gem5::TLB::finalizePhysical ( const RequestPtr req,
ThreadContext tc,
BaseMMU::Mode  mode 
) const
inlineoverridevirtual

Do post-translation physical address finalization.

This method is used by some architectures that need post-translation massaging of physical addresses. For example, X86 uses this to remap physical addresses in the APIC range to a range of physical memory not normally available to real x86 implementations.

Parameters
reqRequest to updated in-place.
tcThread context that created the request.
modeRequest type (read/write/execute).
Returns
A fault on failure, NoFault otherwise.

Implements gem5::BaseTLB.

Definition at line 291 of file tlb.hh.

References panic.

◆ flush() [1/13]

void gem5::TLB::flush ( const DTLBIALL tlbi_op)

◆ flush() [2/13]

void gem5::TLB::flush ( const DTLBIASID tlbi_op)

◆ flush() [3/13]

void gem5::TLB::flush ( const DTLBIMVA tlbi_op)

◆ flush() [4/13]

void gem5::TLB::flush ( const ITLBIALL tlbi_op)

◆ flush() [5/13]

void gem5::TLB::flush ( const ITLBIASID tlbi_op)

◆ flush() [6/13]

void gem5::TLB::flush ( const ITLBIMVA tlbi_op)

◆ flush() [7/13]

void gem5::TLB::flush ( const TLBIALL tlbi_op)

◆ flush() [8/13]

void gem5::TLB::flush ( const TLBIALLEL tlbi_op)

◆ flush() [9/13]

void gem5::TLB::flush ( const TLBIALLN tlbi_op)

Remove all entries in the non secure world, depending on whether they were allocated in hyp mode or not.

Definition at line 445 of file tlb.cc.

References DPRINTF, gem5::ArmISA::EL2, gem5::ArmISA::TLB::TlbStats::flushedEntries, gem5::ArmISA::TLB::TlbStats::flushTlb, size, stats, table, gem5::ArmISA::TLBIOp::targetEL, gem5::ArmISA::te, and gem5::RiscvISA::x.

◆ flush() [10/13]

void gem5::TLB::flush ( const TLBIASID tlbi_op)

◆ flush() [11/13]

void gem5::TLB::flush ( const TLBIMVA tlbi_op)

◆ flush() [12/13]

void gem5::TLB::flush ( const TLBIMVAA tlbi_op)

◆ flush() [13/13]

void gem5::TLB::flush ( const TLBIVMALL tlbi_op)

◆ flushAll()

void gem5::TLB::flushAll ( )
overridevirtual

Reset the entire TLB.

Used for CPU switching to prevent stale translations after multiple switches

Implements gem5::BaseTLB.

Definition at line 298 of file tlb.cc.

References DPRINTF, gem5::ArmISA::TLB::TlbStats::flushedEntries, gem5::ArmISA::TLB::TlbStats::flushTlb, size, stats, table, gem5::ArmISA::te, and gem5::RiscvISA::x.

Referenced by gem5::ArmISA::MMU::flushAll().

◆ getsize()

int gem5::ArmISA::TLB::getsize ( ) const
inline

Definition at line 204 of file tlb.hh.

References size.

◆ getTableWalker()

TableWalker* gem5::ArmISA::TLB::getTableWalker ( )
inline

Definition at line 202 of file tlb.hh.

References tableWalker.

◆ getTableWalkerPort()

Port * gem5::TLB::getTableWalkerPort ( )
overridevirtual

Get the table walker port.

This is used for migrating port connections during a CPU takeOverFrom() call. For architectures that do not have a table walker, NULL is returned, hence the use of a pointer rather than a reference. For ARM this method will always return a valid port pointer.

Returns
A pointer to the walker request port

Reimplemented from gem5::BaseTLB.

Definition at line 703 of file tlb.cc.

References gem5::ArmISA::TableWalker::getTableWalkerPort(), and tableWalker.

◆ insert()

void gem5::TLB::insert ( TlbEntry pte)

◆ lookup()

TlbEntry * gem5::TLB::lookup ( const Lookup lookup_data)

◆ match()

TlbEntry * gem5::TLB::match ( const Lookup lookup_data)
private

Helper function looking up for a matching TLB entry Does not update stats; see lookup method instead.

Definition at line 106 of file tlb.cc.

References gem5::ArmISA::TlbEntry::Lookup::functional, gem5::ArmISA::i, gem5::ArmISA::TlbEntry::lookupLevel, gem5::ArmISA::TlbEntry::partial, rangeMRU, size, table, and gem5::RiscvISA::x.

Referenced by lookup().

◆ multiInsert()

void gem5::TLB::multiInsert ( TlbEntry pte)

◆ multiLookup()

TlbEntry * gem5::TLB::multiLookup ( const Lookup lookup_data)

Lookup an entry in the TLB and in the next levels by following the nextLevel pointer.

Parameters
modeto differentiate between read/writes/fetches.
Returns
pointer to TLB entry if it exists

Definition at line 204 of file tlb.cc.

References checkPromotion(), gem5::ArmISA::TlbEntry::Lookup::functional, insert(), lookup(), gem5::ArmISA::TlbEntry::Lookup::mode, gem5::BaseTLB::nextLevel(), partialLevels, gem5::ArmISA::te, and gem5::ArmISA::tlb.

◆ printTlb()

void gem5::TLB::printTlb ( ) const

Definition at line 284 of file tlb.cc.

References DPRINTF, size, table, gem5::ArmISA::te, and gem5::RiscvISA::x.

◆ regProbePoints()

void gem5::TLB::regProbePoints ( )
overridevirtual

Register probe points for this object.

No probe points by default, so do nothing in base.

Reimplemented from gem5::SimObject.

Definition at line 697 of file tlb.cc.

References gem5::SimObject::getProbeManager(), and ppRefills.

◆ setTableWalker()

void gem5::TLB::setTableWalker ( TableWalker table_walker)

Definition at line 99 of file tlb.cc.

References gem5::ArmISA::TableWalker::setTlb(), and tableWalker.

Referenced by gem5::ArmISA::MMU::init().

◆ setVMID()

void gem5::ArmISA::TLB::setVMID ( vmid_t  _vmid)
inline

Definition at line 208 of file tlb.hh.

References vmid.

Referenced by gem5::ArmISA::MMU::updateMiscReg().

◆ takeOverFrom()

void gem5::TLB::takeOverFrom ( BaseTLB otlb)
overridevirtual

Take over from an old tlb context.

Implements gem5::BaseTLB.

Definition at line 628 of file tlb.cc.

◆ translateAtomic()

Fault gem5::TLB::translateAtomic ( const RequestPtr req,
ThreadContext tc,
BaseMMU::Mode  mode 
)
inlineoverridevirtual

Implements gem5::BaseTLB.

Definition at line 276 of file tlb.hh.

References panic.

◆ translateTiming()

void gem5::TLB::translateTiming ( const RequestPtr req,
ThreadContext tc,
BaseMMU::Translation translation,
BaseMMU::Mode  mode 
)
inlineoverridevirtual

Implements gem5::BaseTLB.

Definition at line 283 of file tlb.hh.

References panic.

◆ trickBoxCheck()

Fault gem5::ArmISA::TLB::trickBoxCheck ( const RequestPtr req,
BaseMMU::Mode  mode,
TlbEntry::DomainType  domain 
)

◆ walkCache()

bool gem5::ArmISA::TLB::walkCache ( ) const
inline

Definition at line 206 of file tlb.hh.

References _walkCache.

◆ walkTrickBoxCheck()

Fault gem5::ArmISA::TLB::walkTrickBoxCheck ( Addr  pa,
bool  is_secure,
Addr  va,
Addr  sz,
bool  is_exec,
bool  is_write,
TlbEntry::DomainType  domain,
LookupLevel  lookup_level 
)

Member Data Documentation

◆ _walkCache

bool gem5::ArmISA::TLB::_walkCache
protected

True if the TLB caches partial translations.

Definition at line 136 of file tlb.hh.

Referenced by TLB(), and walkCache().

◆ isStage2

bool gem5::ArmISA::TLB::isStage2
protected

Indicates this TLB caches IPA->PA translations.

Definition at line 124 of file tlb.hh.

◆ partialLevels

std::unordered_map<enums::ArmLookupLevel, bool> gem5::ArmISA::TLB::partialLevels
protected

Hash map containing one entry per lookup level The TLB is caching partial translations from the key lookup level if the matching value is true.

Definition at line 131 of file tlb.hh.

Referenced by multiInsert(), multiLookup(), and TLB().

◆ ppRefills

probing::PMUUPtr gem5::ArmISA::TLB::ppRefills
protected

PMU probe for TLB refills.

Definition at line 170 of file tlb.hh.

Referenced by insert(), and regProbePoints().

◆ rangeMRU

int gem5::ArmISA::TLB::rangeMRU
protected

Definition at line 172 of file tlb.hh.

Referenced by match().

◆ size

int gem5::ArmISA::TLB::size
protected

TLB Size.

Definition at line 121 of file tlb.hh.

Referenced by flush(), flushAll(), getsize(), insert(), match(), and printTlb().

◆ stats

gem5::ArmISA::TLB::TlbStats gem5::ArmISA::TLB::stats
protected

◆ table

TlbEntry* gem5::ArmISA::TLB::table
protected

Definition at line 118 of file tlb.hh.

Referenced by flush(), flushAll(), insert(), gem5::PowerISA::TLB::lookup(), match(), printTlb(), and ~TLB().

◆ tableWalker

TableWalker* gem5::ArmISA::TLB::tableWalker
protected

Definition at line 138 of file tlb.hh.

Referenced by getTableWalker(), getTableWalkerPort(), and setTableWalker().

◆ vmid

vmid_t gem5::ArmISA::TLB::vmid
protected

Definition at line 173 of file tlb.hh.

Referenced by _flushMva(), flush(), insert(), and setVMID().


The documentation for this class was generated from the following files:

Generated on Tue Dec 21 2021 11:35:23 for gem5 by doxygen 1.8.17