VsidManager Class Reference

#include <VsidManager.h>

Collaboration diagram for VsidManager:

Classes
struct	VsidStack

Public Types
typedef uint32_t	Vsid

Public Member Functions
Vsid	obtainVsid ()
void	returnVsid (Vsid vsid)

Static Public Member Functions
static VsidManager &	instance ()

Private Member Functions
	VsidManager (const VsidManager &)
VsidManager &	operator= (const VsidManager &)
	VsidManager ()
	~VsidManager ()

Private Attributes
Vsid	m_HighWaterMark
VsidStack *	m_pStack
Mutex	m_Mutex

Static Private Attributes
static VsidManager	m_Instance

Detailed Description

PPC has too many possible VSID's to do the same thing as MIPS' ASIDs, so we have to box a little more cleverly.

We have a pointer marking the 'high water mark' of the VSID's already allocated. We also have a stack of VSIDs - when a VSID is released it is pushed onto this stack to be reallocated. If the VSID released == the high water mark, we don't push it and just decrement the high water mark instead.

When a VSID is required, we try and pop one off the stack first. If the stack is empty, we increment the high water mark and return that.

Definition at line 41 of file VsidManager.h.

Member Typedef Documentation

typedef uint32_t VsidManager::Vsid

VSID typedef

Definition at line 45 of file VsidManager.h.

Constructor & Destructor Documentation

VsidManager::VsidManager ( )

private

Default constructor

Definition at line 30 of file VsidManager.cc.

VsidManager::~VsidManager ( )

private

Destructor - not implemented.

Definition at line 34 of file VsidManager.cc.

Member Function Documentation

VsidManager & VsidManager::instance ( )

static

Gets the instance of the VsidManager

Definition at line 25 of file VsidManager.cc.

References m_Instance.

Referenced by PPC32VirtualAddressSpace::PPC32VirtualAddressSpace(), and PPC32VirtualAddressSpace::~PPC32VirtualAddressSpace().

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VsidManager::Vsid VsidManager::obtainVsid

(

)

Returns an VSID. The TLB is flushed of all references to that ASID.

Todo:

Locking

Definition at line 38 of file VsidManager.cc.

References m_HighWaterMark, m_pStack, and NOTICE.

Referenced by PPC32VirtualAddressSpace::PPC32VirtualAddressSpace().

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void VsidManager::returnVsid

(

VsidManager::Vsid

vsid

)

Takes an VSID. The given VSID is returned to the pool of usable VSIDs.

Todo:

Locking

Todo:

decrement high water mark if possible

Definition at line 58 of file VsidManager.cc.

Referenced by PPC32VirtualAddressSpace::~PPC32VirtualAddressSpace().

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Member Data Documentation

Vsid VsidManager::m_HighWaterMark

private

Our 'high water mark'

Definition at line 72 of file VsidManager.h.

Referenced by obtainVsid().

VsidManager VsidManager::m_Instance

staticprivate

The static VsidManager instance - singleton class.

Definition at line 81 of file VsidManager.h.

Referenced by instance().

Mutex VsidManager::m_Mutex

private

Our lock, to protect the integrity of our data.

Definition at line 78 of file VsidManager.h.

VsidStack* VsidManager::m_pStack

private

Our stack of useable VSIDs

Definition at line 75 of file VsidManager.h.

Referenced by obtainVsid().

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

• VsidManager.h
• VsidManager.cc