#include <tlb.hh>

Inheritance diagram for gem5::RiscvISA::TLB:

Classes
struct	TlbStats

Public Types
typedef RiscvTLBParams	Params

Public Types inherited from gem5::SimObject
typedef SimObjectParams	Params

Public Member Functions
	TLB (const Params &p)

Walker *	getWalker ()

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

TlbEntry *	insert (Addr vpn, const TlbEntry &entry)
	Insert an entry into the TLB.

void	flushAll () override
	Remove all entries from the TLB.

void	demapPage (Addr vaddr, uint64_t asn) override

Fault	checkPermissions (STATUS status, PrivilegeMode pmode, Addr vaddr, BaseMMU::Mode mode, PTESv39 pte)

Fault	createPagefault (Addr vaddr, BaseMMU::Mode mode)

PrivilegeMode	getMemPriv (ThreadContext *tc, BaseMMU::Mode mode)

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

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

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

Addr	hiddenTranslateWithTLB (Addr vaddr, uint16_t asid, Addr xmode, BaseMMU::Mode mode)

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	translateFunctional (const RequestPtr &req, ThreadContext *tc, BaseMMU::Mode mode) override

Fault	finalizePhysical (const RequestPtr &req, ThreadContext *tc, BaseMMU::Mode mode) const override
	Do post-translation physical address finalization.

Addr	getValidAddr (Addr vaddr, ThreadContext *tc, BaseMMU::Mode mode)

TlbEntry *	lookup (Addr vpn, uint16_t asid, BaseMMU::Mode mode, bool hidden)
	Perform the tlb lookup.

Public Member Functions inherited from gem5::BaseTLB
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	regProbePoints ()
	Register probe points for this object.

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.

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

Public Attributes
BasePMAChecker *	pma

PMP *	pmp

Protected Attributes
size_t	size

std::vector< TlbEntry >	tlb

TlbEntryTrie	trie

EntryList	freeList

uint64_t	lruSeq

Walker *	walker

gem5::RiscvISA::TLB::TlbStats	stats

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 Types
typedef std::list< TlbEntry * >	EntryList

Private Member Functions
uint64_t	nextSeq ()

void	evictLRU ()

void	remove (size_t idx)

Fault	translate (const RequestPtr &req, ThreadContext tc, BaseMMU::Translation translation, BaseMMU::Mode mode, bool &delayed)

Fault	doTranslate (const RequestPtr &req, ThreadContext tc, BaseMMU::Translation translation, BaseMMU::Mode mode, bool &delayed)

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 59 of file tlb.hh.

Member Typedef Documentation

◆ EntryList

typedef std::list<TlbEntry *> gem5::RiscvISA::TLB::EntryList

private

Definition at line 61 of file tlb.hh.

◆ Params

typedef RiscvTLBParams gem5::RiscvISA::TLB::Params

Definition at line 93 of file tlb.hh.

Constructor & Destructor Documentation

◆ TLB()

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

References gem5::RiscvISA::p.

Referenced by checkPermissions(), doTranslate(), insert(), and remove().

Member Function Documentation

◆ checkPermissions()

Fault gem5::TLB::checkPermissions	(	STATUS	status,
		PrivilegeMode	pmode,
		Addr	vaddr,
		BaseMMU::Mode	mode,
		PTESv39	pte )

Definition at line 251 of file tlb.cc.

References checkPermissions(), createPagefault(), DPRINTF, gem5::BaseMMU::Execute, gem5::RiscvISA::mode, gem5::NoFault, gem5::RiscvISA::PRV_S, gem5::RiscvISA::PRV_U, gem5::BaseMMU::Read, gem5::ArmISA::status, TLB(), gem5::RiscvISA::vaddr, and gem5::BaseMMU::Write.

Referenced by checkPermissions(), and doTranslate().

◆ createPagefault()

Fault gem5::TLB::createPagefault	(	Addr	vaddr,
		BaseMMU::Mode	mode )

Definition at line 286 of file tlb.cc.

References createPagefault(), gem5::RiscvISA::INST_PAGE, gem5::RiscvISA::LOAD_PAGE, gem5::RiscvISA::mode, gem5::BaseMMU::Read, gem5::RiscvISA::STORE_PAGE, gem5::RiscvISA::vaddr, and gem5::BaseMMU::Write.

Referenced by checkPermissions(), and createPagefault().

◆ demapPage()

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

overridevirtual

Implements gem5::BaseTLB.

References gem5::RiscvISA::mode, gem5::ArmISA::status, and gem5::RiscvISA::vaddr.

◆ doTranslate()

Fault gem5::TLB::doTranslate	(	const RequestPtr &	req,
		ThreadContext *	tc,
		BaseMMU::Translation *	translation,
		BaseMMU::Mode	mode,
		bool &	delayed )

private

Definition at line 308 of file tlb.cc.

References checkPermissions(), doTranslate(), DPRINTF, gem5::ArmISA::e, getMemPriv(), gem5::RiscvISA::getVPNFromVAddr(), lookup(), gem5::RiscvISA::mask, gem5::RiscvISA::MISCREG_SATP, gem5::RiscvISA::MISCREG_STATUS, gem5::RiscvISA::mode, gem5::NoFault, gem5::RiscvISA::PageShift, gem5::ThreadContext::readMiscReg(), gem5::sext(), gem5::ArmISA::status, TLB(), gem5::RiscvISA::vaddr, walker, and gem5::BaseMMU::Write.

Referenced by doTranslate(), and translate().

◆ evictLRU()

void gem5::RiscvISA::TLB::evictLRU ( )

private

References gem5::RiscvISA::mode.

Referenced by insert().

◆ finalizePhysical()

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

overridevirtual

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.

References gem5::RiscvISA::mode.

◆ flushAll()

void gem5::RiscvISA::TLB::flushAll ( )

overridevirtual

Remove all entries from the TLB.

Implements gem5::BaseTLB.

◆ getMemPriv()

PrivilegeMode gem5::TLB::getMemPriv	(	ThreadContext *	tc,
		BaseMMU::Mode	mode )

Definition at line 357 of file tlb.cc.

References gem5::BaseMMU::Execute, getMemPriv(), gem5::RiscvISA::MISCREG_PRV, gem5::RiscvISA::MISCREG_STATUS, gem5::RiscvISA::mode, gem5::ThreadContext::readMiscReg(), and gem5::ArmISA::status.

Referenced by doTranslate(), getMemPriv(), and translate().

◆ getTableWalkerPort()

Port * gem5::RiscvISA::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 RISC-V this method will always return a valid port pointer.

Returns: A pointer to the walker port

Reimplemented from gem5::BaseTLB.

References gem5::RiscvISA::asid, gem5::RiscvISA::mode, and gem5::RiscvISA::vaddr.

◆ getValidAddr()

Addr gem5::RiscvISA::TLB::getValidAddr	(	Addr	vaddr,
		ThreadContext *	tc,
		BaseMMU::Mode	mode )

inline

For RV32, we follow what the specification said: When mapping between narrower and wider addresses, RISC-V zero-extends a narrower physical address to a wider size.

Definition at line 148 of file tlb.hh.

References gem5::bits(), gem5::ThreadContext::getIsaPtr(), gem5::RiscvISA::mode, gem5::RiscvISA::RV32, gem5::RiscvISA::ISA::rvType(), and gem5::RiscvISA::vaddr.

Referenced by translate().

◆ getWalker()

Walker * gem5::RiscvISA::TLB::getWalker ( )

◆ hiddenTranslateWithTLB()

Addr gem5::TLB::hiddenTranslateWithTLB	(	Addr	vaddr,
		uint16_t	asid,
		Addr	xmode,
		BaseMMU::Mode	mode )

Definition at line 299 of file tlb.cc.

References gem5::RiscvISA::asid, gem5::ArmISA::e, gem5::RiscvISA::getVPNFromVAddr(), hiddenTranslateWithTLB(), lookup(), gem5::RiscvISA::mask, gem5::RiscvISA::mode, gem5::RiscvISA::PageShift, and gem5::RiscvISA::vaddr.

Referenced by hiddenTranslateWithTLB().

◆ insert()

TlbEntry * gem5::TLB::insert	(	Addr	vpn,
		const TlbEntry &	entry )

Insert an entry into the TLB.

Parameters

vpn	The virtual page number extracted from the address. It is shifted based on the page size. We assume the smallest defined page size and remove the upper bits of the virtual address that are not part of the page number.
entry	The entry to insert.

Definition at line 152 of file tlb.cc.

References gem5::RiscvISA::TlbEntry::asid, gem5::buildKey(), DPRINTF, evictLRU(), freeList, insert(), gem5::RiscvISA::TlbEntry::logBytes, lookup(), gem5::RiscvISA::TlbEntry::lruSeq, gem5::Trie< Addr, TlbEntry >::MaxBits, nextSeq(), gem5::RiscvISA::TlbEntry::paddr, gem5::RiscvISA::PageShift, gem5::RiscvISA::TlbEntry::pte, gem5::BaseMMU::Read, gem5::RiscvISA::TlbEntry::size(), TLB(), trie, gem5::RiscvISA::TlbEntry::trieHandle, and gem5::RiscvISA::TlbEntry::vaddr.

Referenced by insert().

◆ lookup()

TlbEntry * gem5::TLB::lookup	(	Addr	vpn,
		uint16_t	asid,
		BaseMMU::Mode	mode,
		bool	hidden )

Perform the tlb lookup.

Parameters

vpn	The virtual page number extracted from the address. It is shifted based on the page size. We assume the smallest defined page size and remove the upper bits of the virtual address that are not part of the page number.
asid	The address space identifier as specified by satp.
mode	The mode of the memory operation.
hidden	If the lookup should be hidden from the statistics.

Definition at line 115 of file tlb.cc.

References gem5::RiscvISA::asid, gem5::buildKey(), DPRINTF, lookup(), gem5::RiscvISA::TlbEntry::lruSeq, gem5::RiscvISA::mode, nextSeq(), gem5::RiscvISA::TlbEntry::paddr, gem5::RiscvISA::TlbEntry::size(), stats, trie, and gem5::BaseMMU::Write.

Referenced by doTranslate(), hiddenTranslateWithTLB(), insert(), and lookup().

◆ nextSeq()

uint64_t gem5::RiscvISA::TLB::nextSeq ( )

inlineprivate

Definition at line 175 of file tlb.hh.

References lruSeq.

Referenced by insert(), and lookup().

◆ remove()

void gem5::TLB::remove ( size_t idx )

private

Definition at line 238 of file tlb.cc.

References gem5::RiscvISA::asid, DPRINTF, freeList, remove(), size, TLB(), tlb, trie, and gem5::RiscvISA::vaddr.

Referenced by remove().

◆ serialize()

void gem5::RiscvISA::TLB::serialize ( CheckpointOut & cp ) const

overridevirtual

Serialize an object.

Output an object's state into the current checkpoint section.

Parameters

cp	Checkpoint state

Reimplemented from gem5::SimObject.

◆ takeOverFrom()

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

inlineoverridevirtual

Take over from an old tlb context.

Implements gem5::BaseTLB.

Definition at line 98 of file tlb.hh.

References gem5::BaseTLB::BaseTLB().

◆ translate()

Fault gem5::TLB::translate	(	const RequestPtr &	req,
		ThreadContext *	tc,
		BaseMMU::Translation *	translation,
		BaseMMU::Mode	mode,
		bool &	delayed )

private

we simply set the virtual address to physical address.

Definition at line 367 of file tlb.cc.

References doTranslate(), gem5::FullSystem, getMemPriv(), gem5::ThreadContext::getProcessPtr(), getValidAddr(), gem5::RiscvISA::MISCREG_ISA, gem5::RiscvISA::MISCREG_SATP, gem5::RiscvISA::mode, gem5::NoFault, gem5::RiscvISA::p, gem5::Request::PHYSICAL, pma, pmp, gem5::RiscvISA::PRV_M, gem5::ThreadContext::readMiscReg(), gem5::ThreadContext::readMiscRegNoEffect(), translate(), and gem5::RiscvISA::vaddr.

Referenced by translate().

◆ translateAtomic()

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

overridevirtual

Implements gem5::BaseTLB.

References gem5::RiscvISA::mode.

◆ translateFunctional()

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

overridevirtual

Reimplemented from gem5::BaseTLB.

References gem5::RiscvISA::mode.

◆ translateTiming()

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

overridevirtual

Implements gem5::BaseTLB.

References gem5::RiscvISA::mode.

◆ unserialize()

void gem5::RiscvISA::TLB::unserialize ( CheckpointIn & cp )

overridevirtual

Unserialize an object.

Read an object's state from the current checkpoint section.

Parameters

cp	Checkpoint state

Reimplemented from gem5::SimObject.

Member Data Documentation

◆ freeList

EntryList gem5::RiscvISA::TLB::freeList

protected

Definition at line 67 of file tlb.hh.

Referenced by insert(), and remove().

◆ lruSeq

uint64_t gem5::RiscvISA::TLB::lruSeq

protected

Definition at line 68 of file tlb.hh.

Referenced by nextSeq().

◆ pma

BasePMAChecker* gem5::RiscvISA::TLB::pma

Definition at line 89 of file tlb.hh.

Referenced by translate().

◆ pmp

PMP* gem5::RiscvISA::TLB::pmp

Definition at line 90 of file tlb.hh.

Referenced by translate().

◆ size

size_t gem5::RiscvISA::TLB::size

protected

Definition at line 64 of file tlb.hh.

Referenced by remove().

◆ stats

gem5::RiscvISA::TLB::TlbStats gem5::RiscvISA::TLB::stats

protected

Referenced by lookup().

◆ tlb

std::vector<TlbEntry> gem5::RiscvISA::TLB::tlb

protected

Definition at line 65 of file tlb.hh.

Referenced by remove().

◆ trie

TlbEntryTrie gem5::RiscvISA::TLB::trie

protected

Definition at line 66 of file tlb.hh.

Referenced by insert(), lookup(), and remove().

◆ walker

Walker* gem5::RiscvISA::TLB::walker

protected

Definition at line 70 of file tlb.hh.

Referenced by doTranslate().

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

arch/riscv/tlb.hh
arch/riscv/tlb.cc

Classes

Public Types

Public Member Functions

Public Attributes

Protected Attributes

Private Types

Private Member Functions

Additional Inherited Members

Detailed Description

Member Typedef Documentation

◆ EntryList

◆ Params

Constructor & Destructor Documentation

◆ TLB()

Member Function Documentation

◆ checkPermissions()

◆ createPagefault()

◆ demapPage()

◆ doTranslate()

◆ evictLRU()

◆ finalizePhysical()

◆ flushAll()

◆ getMemPriv()

◆ getTableWalkerPort()

◆ getValidAddr()

◆ getWalker()

◆ hiddenTranslateWithTLB()

◆ insert()

◆ lookup()

◆ nextSeq()

◆ remove()

◆ serialize()

◆ takeOverFrom()

◆ translate()

◆ translateAtomic()

◆ translateFunctional()

◆ translateTiming()

◆ unserialize()

Member Data Documentation

◆ freeList

◆ lruSeq

◆ pma

◆ pmp

◆ size

◆ stats

◆ tlb

◆ trie

◆ walker