#include <tlb.hh>

Inheritance diagram for gem5::ArmISA::TLB:

Classes
class	Table

struct	TlbStats

Public Types
using	Params = ArmTLBParams

using	Lookup = TlbEntry::KeyType

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)

TlbEntry *	lookup (Lookup lookup_data)
	Lookup an entry in the TLB.

TlbEntry *	multiLookup (const Lookup &lookup_data)
	Lookup an entry in the TLB and in the next levels by following the nextLevel pointer.

virtual	~TLB ()

void	takeOverFrom (BaseTLB *otlb) override
	Take over from an old tlb context.

void	setTableWalker (TableWalker *table_walker)

TableWalker *	getTableWalker ()

int	getsize () const

bool	walkCache () const

void	setVMID (vmid_t _vmid)

void	insert (const Lookup &lookup_data, TlbEntry &pte)
	Insert a PTE in the current TLB.

void	multiInsert (const Lookup &lookup_data, TlbEntry &pte)
	Insert a PTE in the current TLB and in the higher levels.

void	flushAll () override
	Reset the entire TLB.

void	flush (const TLBIOp &tlbi_op)
	Flush TLB entries.

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.

void	regProbePoints () override
	Register probe points for this object.

Port *	getTableWalkerPort () override
	Get the table walker port.

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.

TypeTLB	type () const

BaseTLB *	nextLevel () const

Public Member Functions inherited from gem5::SimObject
const Params &	params () 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.

virtual void	loadState (CheckpointIn &cp)
	loadState() is called on each SimObject when restoring from a checkpoint.

virtual void	initState ()
	initState() is called on each SimObject when not restoring from a checkpoint.

virtual void	regProbeListeners ()
	Register probe listeners for this object.

ProbeManager *	getProbeManager ()
	Get the probe manager for this object.

virtual Port &	getPort (const std::string &if_name, PortID idx=InvalidPortID)
	Get a port with a given name and index.

virtual void	startup ()
	startup() is the final initialization call before simulation.

DrainState	drain () override
	Provide a default implementation of the drain interface for objects that don't need draining.

virtual void	memWriteback ()
	Write back dirty buffers to memory using functional writes.

void	serialize (CheckpointOut &cp) const override
	Serialize an object.

void	unserialize (CheckpointIn &cp) override
	Unserialize an object.

Public Member Functions inherited from gem5::EventManager
EventQueue *	eventQueue () 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.

void	setCurTick (Tick newVal)

	EventManager (EventManager &em)
	Event manger manages events in the event queue.

	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.

void	serializeSection (CheckpointOut &cp, const std::string &name) const

void	unserializeSection (CheckpointIn &cp, const char *name)
	Unserialize an a child object.

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.

virtual void	notifyFork ()
	Notify a child process of a fork.

Public Member Functions inherited from gem5::statistics::Group
	Group (Group parent, const char name=nullptr)
	Construct a new statistics group.

virtual	~Group ()

virtual void	regStats ()
	Callback to set stat parameters.

virtual void	resetStats ()
	Callback to reset stats.

virtual void	preDumpStats ()
	Callback before stats are dumped.

void	addStat (statistics::Info *info)
	Register a stat with this group.

const std::map< std::string, Group * > &	getStatGroups () const
	Get all child groups associated with this object.

const std::vector< Info * > &	getStats () const
	Get all stats associated with this object.

void	addStatGroup (const char name, Group block)
	Add a stat block as a child of this block.

const Info *	resolveStat (std::string name) const
	Resolve a stat by its name within this group.

void	mergeStatGroup (Group *block)
	Merge the contents (stats & children) of a block to this block.

	Group ()=delete

	Group (const Group &)=delete

Group &	operator= (const Group &)=delete

Public Member Functions inherited from gem5::Named
	Named (std::string_view name_)

virtual	~Named ()=default

virtual std::string	name () const

Protected Attributes
gem5::ArmISA::TLB::Table	table

int	size
	TLB Size.

bool	isStage2
	Indicates this TLB caches IPA->PA translations.

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.

bool	_walkCache
	True if the TLB caches partial translations.

TableWalker *	tableWalker

gem5::ArmISA::TLB::TlbStats	stats

probing::PMUUPtr	ppRefills
	PMU probe for TLB refills.

int	rangeMRU

vmid_t	vmid

std::set< Addr >	observedPageSizes
	Set of observed page sizes in the TLB We update the set conservatively, therefore allowing false positives but not false negatives.

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.

Protected Attributes inherited from gem5::EventManager
EventQueue *	eventq
	A pointer to this object's event queue.

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.

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:

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.

static SimObject *	find (const char *name)
	Find the SimObject with the given name and return a pointer to it.

static void	setSimObjectResolver (SimObjectResolver *resolver)
	There is a single object name resolver, and it is only set when simulation is restoring from checkpoints.

static SimObjectResolver *	getSimObjectResolver ()
	There is a single object name resolver, and it is only set when simulation is restoring from checkpoints.

Static Public Member Functions inherited from gem5::Serializable
static const std::string &	currentSection ()
	Gets the fully-qualified name of the active section.

static void	generateCheckpointOut (const std::string &cpt_dir, std::ofstream &outstream)
	Generate a checkpoint file so that the serialization can be routed to it.

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.

void	signalDrainDone () const
	Signal that an object is drained.

Detailed Description

Definition at line 103 of file tlb.hh.

Member Typedef Documentation

◆ Lookup

using gem5::ArmISA::TLB::Lookup = TlbEntry::KeyType

Definition at line 194 of file tlb.hh.

◆ LookupLevel

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

Definition at line 195 of file tlb.hh.

◆ Params

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

Definition at line 193 of file tlb.hh.

Constructor & Destructor Documentation

◆ TLB() [1/2]

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

Definition at line 101 of file tlb.cc.

References _walkCache, gem5::BaseTLB::BaseTLB(), isStage2, gem5::Named::name(), gem5::MipsISA::p, partialLevels, rangeMRU, size, stats, table, tableWalker, and vmid.

Referenced by flush(), flushAll(), multiInsert(), multiLookup(), printTlb(), and gem5::ArmISA::TLB::TlbStats::TlbStats().

◆ TLB() [2/2]

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

References gem5::BaseTLB::BaseTLB(), and gem5::MipsISA::p.

◆ ~TLB()

gem5::TLB::~TLB ( )

virtual

Definition at line 138 of file tlb.cc.

Member Function Documentation

◆ _flushMva()

void gem5::ArmISA::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

mva	virtual address to flush
asn	contextid/asn to flush on match
secure_lookup	if the operation affects the secure world
ignore_asn	if the flush should ignore the asn
in_host	if hcr.e2h == 1 and hcr.tge == 1 for VHE.
entry_type	type of entry to flush (instruction/data/unified)

References gem5::ArmISA::mode.

◆ 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 232 of file tlb.cc.

References 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 245 of file tlb.hh.

References panic, and gem5::MipsISA::vaddr.

◆ 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

req	Request to updated in-place.
tc	Thread context that created the request.
mode	Request type (read/write/execute).

Returns: A fault on failure, NoFault otherwise.

Implements gem5::BaseTLB.

Definition at line 267 of file tlb.hh.

References gem5::ArmISA::mode, and panic.

◆ flush()

void gem5::TLB::flush ( const TLBIOp & tlbi_op )

Flush TLB entries.

Definition at line 304 of file tlb.cc.

References DPRINTF, gem5::ArmISA::TLBIOp::match(), observedPageSizes, stats, table, gem5::ArmISA::te, TLB(), and vmid.

◆ 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 286 of file tlb.cc.

References DPRINTF, observedPageSizes, stats, table, gem5::ArmISA::te, and TLB().

◆ getsize()

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

inline

Definition at line 221 of file tlb.hh.

References size.

◆ getTableWalker()

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

inline

Definition at line 219 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 394 of file tlb.cc.

References tableWalker.

◆ insert()

void gem5::TLB::insert	(	const Lookup &	lookup_data,
		TlbEntry &	pte )

Insert a PTE in the current TLB.

Definition at line 246 of file tlb.cc.

References gem5::ArmISA::TlbEntry::N, observedPageSizes, ppRefills, stats, and table.

Referenced by multiInsert(), and multiLookup().

◆ lookup()

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

Lookup an entry in the TLB.

Returns: pointer to TLB entry if it exists

Definition at line 150 of file tlb.cc.

Referenced by multiInsert(), and multiLookup().

◆ multiInsert()

void gem5::TLB::multiInsert	(	const Lookup &	lookup_data,
		TlbEntry &	pte )

Insert a PTE in the current TLB and in the higher levels.

Definition at line 262 of file tlb.cc.

References insert(), lookup(), gem5::ArmISA::TlbEntry::lookupLevel, gem5::BaseTLB::nextLevel(), gem5::ArmISA::TlbEntry::partial, partialLevels, and TLB().

◆ 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

mode	to differentiate between read/writes/fetches.

Returns: pointer to TLB entry if it exists

Definition at line 209 of file tlb.cc.

References checkPromotion(), gem5::ArmISA::TLBTypes::KeyType::functional, insert(), lookup(), gem5::ArmISA::TLBTypes::KeyType::mode, gem5::BaseTLB::nextLevel(), partialLevels, gem5::ArmISA::te, TLB(), and gem5::ArmISA::tlb.

◆ printTlb()

void gem5::TLB::printTlb ( ) const

Definition at line 276 of file tlb.cc.

References DPRINTF, table, gem5::ArmISA::te, and TLB().

◆ 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 388 of file tlb.cc.

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

◆ setTableWalker()

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

Definition at line 143 of file tlb.cc.

References tableWalker.

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

◆ setVMID()

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

inline

Definition at line 225 of file tlb.hh.

References vmid.

◆ takeOverFrom()

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

overridevirtual

Take over from an old tlb context.

Implements gem5::BaseTLB.

Definition at line 325 of file tlb.cc.

References gem5::BaseTLB::BaseTLB().

◆ translateAtomic()

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

inlineoverridevirtual

Implements gem5::BaseTLB.

Definition at line 252 of file tlb.hh.

References gem5::ArmISA::mode, and panic.

◆ translateTiming()

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

inlineoverridevirtual

Implements gem5::BaseTLB.

Definition at line 259 of file tlb.hh.

References gem5::ArmISA::mode, and panic.

◆ walkCache()

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

inline

Definition at line 223 of file tlb.hh.

References _walkCache.

Member Data Documentation

◆ _walkCache

bool gem5::ArmISA::TLB::_walkCache

protected

True if the TLB caches partial translations.

Definition at line 146 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 134 of file tlb.hh.

Referenced by TLB().

◆ observedPageSizes

std::set<Addr> gem5::ArmISA::TLB::observedPageSizes

protected

Set of observed page sizes in the TLB We update the set conservatively, therefore allowing false positives but not false negatives.

This means there could be a stored page size with no matching TLB entry (e.g. it has been invalidated), but if the page size is not in the set, we are certain there is no associated TLB with that size

Definition at line 190 of file tlb.hh.

Referenced by flush(), flushAll(), insert(), and lookup().

◆ 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 141 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 177 of file tlb.hh.

Referenced by insert(), and regProbePoints().

◆ rangeMRU

int gem5::ArmISA::TLB::rangeMRU

protected

Definition at line 179 of file tlb.hh.

Referenced by TLB().

◆ size

int gem5::ArmISA::TLB::size

protected

TLB Size.

Definition at line 131 of file tlb.hh.

Referenced by getsize(), and TLB().

◆ stats

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

protected

Referenced by flush(), flushAll(), insert(), lookup(), and TLB().

◆ table

gem5::ArmISA::TLB::Table gem5::ArmISA::TLB::table

protected

Referenced by flush(), flushAll(), insert(), lookup(), printTlb(), and TLB().

◆ tableWalker

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

protected

Definition at line 148 of file tlb.hh.

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

◆ vmid

vmid_t gem5::ArmISA::TLB::vmid

protected

Definition at line 180 of file tlb.hh.

Referenced by flush(), setVMID(), and TLB().

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

arch/arm/tlb.hh
arch/arm/tlb.cc
arch/mips/tlb.cc
arch/power/tlb.cc
arch/riscv/tlb.cc

Classes

Public Types

Public Member Functions

Protected Attributes

Private Member Functions

Additional Inherited Members

Detailed Description

Member Typedef Documentation

◆ Lookup

◆ LookupLevel

◆ Params

Constructor & Destructor Documentation

◆ TLB() [1/2]

◆ TLB() [2/2]

◆ ~TLB()

Member Function Documentation

◆ _flushMva()

◆ checkPromotion()

◆ demapPage()

◆ finalizePhysical()

◆ flush()

◆ flushAll()

◆ getsize()

◆ getTableWalker()

◆ getTableWalkerPort()

◆ insert()

◆ lookup()

◆ multiInsert()

◆ multiLookup()

◆ printTlb()

◆ regProbePoints()

◆ setTableWalker()

◆ setVMID()

◆ takeOverFrom()

◆ translateAtomic()

◆ translateTiming()

◆ walkCache()

Member Data Documentation

◆ _walkCache

◆ isStage2

◆ observedPageSizes

◆ partialLevels

◆ ppRefills

◆ rangeMRU

◆ size

◆ stats

◆ table

◆ tableWalker

◆ vmid