gem5  v22.0.0.2
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gem5::BaseMMU Class Referenceabstract

#include <mmu.hh>

Inheritance diagram for gem5::BaseMMU:
gem5::SimObject gem5::EventManager gem5::Serializable gem5::Drainable gem5::statistics::Group gem5::Named gem5::ArmISA::MMU gem5::Iris::MMU gem5::MipsISA::MMU gem5::PowerISA::MMU gem5::RiscvISA::MMU gem5::SparcISA::MMU gem5::X86ISA::MMU

Classes

class  MMUTranslationGen
 
class  Translation
 

Public Types

enum  Mode { Read, Write, Execute }
 
- Public Types inherited from gem5::SimObject
typedef SimObjectParams Params
 

Public Member Functions

void init () override
 Called at init time, this method is traversing the TLB hierarchy and pupulating the instruction/data/unified containers accordingly. More...
 
virtual void flushAll ()
 
void demapPage (Addr vaddr, uint64_t asn)
 
virtual Fault translateAtomic (const RequestPtr &req, ThreadContext *tc, Mode mode)
 
virtual void translateTiming (const RequestPtr &req, ThreadContext *tc, Translation *translation, Mode mode)
 
virtual Fault translateFunctional (const RequestPtr &req, ThreadContext *tc, Mode mode)
 
virtual TranslationGenPtr translateFunctional (Addr start, Addr size, ThreadContext *tc, BaseMMU::Mode mode, Request::Flags flags)=0
 Returns a translation generator for a region of virtual addresses, instead of directly translating a specific address. More...
 
virtual Fault finalizePhysical (const RequestPtr &req, ThreadContext *tc, Mode mode) const
 
virtual void takeOverFrom (BaseMMU *old_mmu)
 
- Public Member Functions inherited from gem5::SimObject
const Paramsparams () const
 
 SimObject (const Params &p)
 
virtual ~SimObject ()
 
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 regProbePoints ()
 Register probe points for this object. 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...
 
virtual void memInvalidate ()
 Invalidate the contents of memory buffers. 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
 

Public Attributes

BaseTLBdtb
 
BaseTLBitb
 

Protected Types

typedef BaseMMUParams Params
 

Protected Member Functions

 BaseMMU (const Params &p)
 
BaseTLBgetTlb (Mode mode) const
 
- 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...
 

Protected Attributes

std::set< BaseTLB * > instruction
 It is possible from the MMU to traverse the entire hierarchy of TLBs, starting from the DTB and ITB (generally speaking from the first level) up to the last level via the nextLevel pointer. More...
 
std::set< BaseTLB * > data
 
std::set< BaseTLB * > unified
 
- 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...
 

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...
 

Detailed Description

Definition at line 53 of file mmu.hh.

Member Typedef Documentation

◆ Params

typedef BaseMMUParams gem5::BaseMMU::Params
protected

Definition at line 88 of file mmu.hh.

Member Enumeration Documentation

◆ Mode

Enumerator
Read 
Write 
Execute 

Definition at line 56 of file mmu.hh.

Constructor & Destructor Documentation

◆ BaseMMU()

gem5::BaseMMU::BaseMMU ( const Params p)
inlineprotected

Definition at line 90 of file mmu.hh.

Member Function Documentation

◆ demapPage()

void gem5::BaseMMU::demapPage ( Addr  vaddr,
uint64_t  asn 
)

◆ finalizePhysical()

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

Reimplemented in gem5::ArmISA::MMU.

Definition at line 125 of file mmu.cc.

References gem5::BaseTLB::finalizePhysical(), getTlb(), and gem5::ArmISA::mode.

Referenced by gem5::BaseKvmCPU::doMMIOAccess().

◆ flushAll()

void gem5::BaseMMU::flushAll ( )
virtual

◆ getTlb()

BaseTLB* gem5::BaseMMU::getTlb ( Mode  mode) const
inlineprotected

Definition at line 95 of file mmu.hh.

References dtb, Execute, itb, and gem5::ArmISA::mode.

Referenced by finalizePhysical(), translateAtomic(), translateFunctional(), and translateTiming().

◆ init()

void gem5::BaseMMU::init ( )
overridevirtual

Called at init time, this method is traversing the TLB hierarchy and pupulating the instruction/data/unified containers accordingly.

Reimplemented from gem5::SimObject.

Definition at line 53 of file mmu.cc.

References data, data, dtb, instruction, itb, panic, gem5::ArmISA::tlb, and unified.

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

◆ takeOverFrom()

void gem5::BaseMMU::takeOverFrom ( BaseMMU old_mmu)
virtual

◆ translateAtomic()

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

◆ translateFunctional() [1/2]

virtual TranslationGenPtr gem5::BaseMMU::translateFunctional ( Addr  start,
Addr  size,
ThreadContext tc,
BaseMMU::Mode  mode,
Request::Flags  flags 
)
pure virtual

Returns a translation generator for a region of virtual addresses, instead of directly translating a specific address.

Implemented in gem5::ArmISA::MMU, gem5::X86ISA::MMU, gem5::RiscvISA::MMU, gem5::SparcISA::MMU, gem5::MipsISA::MMU, and gem5::PowerISA::MMU.

◆ translateFunctional() [2/2]

Fault gem5::BaseMMU::translateFunctional ( const RequestPtr req,
ThreadContext tc,
BaseMMU::Mode  mode 
)
virtual

◆ translateTiming()

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

Member Data Documentation

◆ data

std::set<BaseTLB*> gem5::BaseMMU::data
protected

◆ dtb

BaseTLB* gem5::BaseMMU::dtb

◆ instruction

std::set<BaseTLB*> gem5::BaseMMU::instruction
protected

It is possible from the MMU to traverse the entire hierarchy of TLBs, starting from the DTB and ITB (generally speaking from the first level) up to the last level via the nextLevel pointer.

So in theory no extra data should be stored in the BaseMMU.

This design makes some operations a bit more complex. For example if we have a unified (I+D) L2, it will be pointed by both ITB and DTB. If we want to invalidate all TLB entries, we should be careful to not invalidate L2 twice, but if we simply follow the next level pointer, we might do so. This is not a problem from a functional perspective but alters the TLB statistics (a single invalidation is recorded twice)

We then provide a different view of the set of TLBs in the system. At the init phase we traverse the TLB hierarchy and we add every TLB to the appropriate set. This makes invalidation (and any operation targeting a specific kind of TLBs) easier.

Definition at line 181 of file mmu.hh.

Referenced by gem5::ArmISA::MMU::checkWalkCache(), flushAll(), gem5::ArmISA::MMU::flushStage1(), gem5::ArmISA::MMU::iflush(), init(), and gem5::ArmISA::MMU::updateMiscReg().

◆ itb

BaseTLB* gem5::BaseMMU::itb

◆ unified

std::set<BaseTLB*> gem5::BaseMMU::unified
protected

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

Generated on Thu Jul 28 2022 13:32:58 for gem5 by doxygen 1.8.17