gem5
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Specialization for accessing a copy-on-write disk image layer. More...
#include <disk_image.hh>
Classes | |
struct | Sector |
Public Types | |
typedef CowDiskImageParams | Params |
Public Types inherited from DiskImage | |
typedef DiskImageParams | Params |
Public Types inherited from SimObject | |
typedef SimObjectParams | Params |
Public Member Functions | |
CowDiskImage (const Params *p) | |
~CowDiskImage () | |
void | notifyFork () override |
Notify a child process of a fork. More... | |
void | initSectorTable (int hash_size) |
bool | open (const std::string &file) |
void | save () const |
void | save (const std::string &file) const |
void | writeback () |
void | serialize (CheckpointOut &cp) const override |
Serialize an object. More... | |
void | unserialize (CheckpointIn &cp) override |
Unserialize an object. More... | |
std::streampos | size () const override |
std::streampos | read (uint8_t *data, std::streampos offset) const override |
std::streampos | write (const uint8_t *data, std::streampos offset) override |
Public Member Functions inherited from DiskImage | |
DiskImage (const Params *p) | |
virtual | ~DiskImage () |
Public Member Functions inherited from SimObject | |
const Params * | params () const |
SimObject (const Params *_params) | |
virtual | ~SimObject () |
virtual const std::string | name () const |
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 | regStats () |
Register statistics for this object. More... | |
virtual void | resetStats () |
Reset statistics associated with this object. More... | |
virtual void | regProbePoints () |
Register probe points for this object. More... | |
virtual void | regProbeListeners () |
Register probe listeners for this object. More... | |
ProbeManager * | getProbeManager () |
Get the probe manager for this object. 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 EventManager | |
EventManager (EventManager &em) | |
EventManager (EventManager *em) | |
EventManager (EventQueue *eq) | |
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) |
void | setCurTick (Tick newVal) |
Public Member Functions inherited from 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 Drainable | |
DrainState | drainState () const |
Return the current drain state of an object. More... | |
Static Public Attributes | |
static const uint32_t | VersionMajor = 1 |
static const uint32_t | VersionMinor = 0 |
Static Public Attributes inherited from Serializable | |
static int | ckptCount = 0 |
static int | ckptMaxCount = 0 |
static int | ckptPrevCount = -1 |
Protected Types | |
typedef std::unordered_map < uint64_t, Sector * > | SectorTable |
Protected Attributes | |
std::string | filename |
DiskImage * | child |
SectorTable * | table |
Protected Attributes inherited from DiskImage | |
bool | initialized |
Protected Attributes inherited from SimObject | |
const SimObjectParams * | _params |
Cached copy of the object parameters. More... | |
Protected Attributes inherited from EventManager | |
EventQueue * | eventq |
A pointer to this object's event queue. More... | |
Additional Inherited Members | |
Static Public Member Functions inherited from SimObject | |
static void | serializeAll (CheckpointOut &cp) |
Serialize all SimObjects in the system. More... | |
static SimObject * | find (const char *name) |
Find the SimObject with the given name and return a pointer to it. More... | |
Static Public Member Functions inherited from Serializable | |
static const std::string & | currentSection () |
Get the fully-qualified name of the active section. More... | |
static void | serializeAll (const std::string &cpt_dir) |
static void | unserializeGlobals (CheckpointIn &cp) |
Protected Member Functions inherited from Drainable | |
Drainable () | |
virtual | ~Drainable () |
virtual void | drainResume () |
Resume execution after a successful drain. More... | |
void | signalDrainDone () const |
Signal that an object is drained. More... | |
Specialization for accessing a copy-on-write disk image layer.
A copy-on-write(COW) layer must be stacked on top of another disk image layer this layer can be another CowDiskImage, or a RawDiskImage.
This object is designed to provide a mechanism for persistant changes to a main disk image, or to provide a place for temporary changes to the image to take place that later may be thrown away.
Definition at line 106 of file disk_image.hh.
typedef CowDiskImageParams CowDiskImage::Params |
Definition at line 124 of file disk_image.hh.
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protected |
Definition at line 116 of file disk_image.hh.
CowDiskImage::CowDiskImage | ( | const Params * | p | ) |
Definition at line 183 of file disk_image.cc.
References fatal, filename, initSectorTable(), open(), and registerExitCallback().
CowDiskImage::~CowDiskImage | ( | ) |
Definition at line 200 of file disk_image.cc.
void CowDiskImage::initSectorTable | ( | int | hash_size | ) |
Definition at line 297 of file disk_image.cc.
References DiskImage::initialized, and table.
Referenced by CowDiskImage().
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overridevirtual |
Notify a child process of a fork.
When calling fork in gem5, we need to ensure that resources shared between the parent and the child are consistent. This method is intended to be overloaded to handle that. For example, an object could use this method to re-open input files to get a separate file description with a private file offset.
This method is only called in the child of the fork. The call takes place in a drained system.
Reimplemented from Drainable.
Definition at line 212 of file disk_image.cc.
References filename, inform, and SimObject::params().
bool CowDiskImage::open | ( | const std::string & | file | ) |
Definition at line 251 of file disk_image.cc.
References ArmISA::i, DiskImage::initialized, ArmISA::offset, panic, SafeRead(), SafeReadSwap(), table, VersionMajor, and VersionMinor.
Referenced by CowDiskImage(), and unserialize().
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overridevirtual |
Implements DiskImage.
Definition at line 393 of file disk_image.cc.
References child, DDUMP, DPRINTF, ArmISA::i, DiskImage::initialized, panic, DiskImage::read(), SectorSize, size(), and table.
void CowDiskImage::save | ( | ) | const |
Definition at line 333 of file disk_image.cc.
References filename.
Referenced by CowDiskCallback::process(), and serialize().
void CowDiskImage::save | ( | const std::string & | file | ) | const |
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overridevirtual |
Serialize an object.
Output an object's state into the current checkpoint section.
cp | Checkpoint state |
Implements Serializable.
Definition at line 437 of file disk_image.cc.
References CheckpointIn::dir(), SimObject::name(), save(), and SERIALIZE_SCALAR.
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overridevirtual |
Implements DiskImage.
Definition at line 389 of file disk_image.cc.
References child, and DiskImage::size().
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overridevirtual |
Unserialize an object.
Read an object's state from the current checkpoint section.
cp | Checkpoint state |
Implements Serializable.
Definition at line 445 of file disk_image.cc.
References CheckpointIn::cptDir, open(), and UNSERIALIZE_SCALAR.
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overridevirtual |
Implements DiskImage.
Definition at line 413 of file disk_image.cc.
References DDUMP, DPRINTF, ArmISA::i, DiskImage::initialized, panic, SectorSize, size(), and table.
void CowDiskImage::writeback | ( | ) |
Definition at line 377 of file disk_image.cc.
References child, ArmISA::i, table, and DiskImage::write().
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protected |
Definition at line 120 of file disk_image.hh.
Referenced by read(), size(), and writeback().
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protected |
Definition at line 119 of file disk_image.hh.
Referenced by CowDiskImage(), notifyFork(), and save().
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protected |
Definition at line 121 of file disk_image.hh.
Referenced by initSectorTable(), open(), read(), write(), writeback(), and ~CowDiskImage().
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static |
Definition at line 109 of file disk_image.hh.
Referenced by open().
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static |
Definition at line 110 of file disk_image.hh.
Referenced by open().