The Pedigree Project: HashedPageTable Class Reference

The Pedigree Project 0.1

#include <HashedPageTable.h>

Collaboration diagram for HashedPageTable:

Classes
struct	BATL

struct	BATU

struct	PTE

struct	PTEG

Public Member Functions
void	initialise (Translations &translations, uint32_t ramMax)

void	addMapping (uint32_t effectiveAddress, uint32_t physicalAddress, uint32_t mode, uint32_t vsid)

void	removeMapping (uint32_t effectiveAddress, uint32_t vsid)

bool	isMapped (uint32_t effectiveAddress, uint32_t vsid)

uint32_t	getMapping (uint32_t effectiveAddress, uint32_t vsid)

Static Public Member Functions
static HashedPageTable &	instance ()

Private Member Functions
	HashedPageTable (const HashedPageTable &)

HashedPageTable &	operator= (const HashedPageTable &)

void	setIBAT (size_t n, uintptr_t virt, physical_uintptr_t phys, size_t size, uint32_t mode)

void	setDBAT (size_t n, uintptr_t virt, physical_uintptr_t phys, size_t size, uint32_t mode)

Private Attributes
PTEG *	m_pHtab

uint32_t	m_Size

uint32_t	m_Mask

Static Private Attributes
static HashedPageTable	m_Instance

Detailed Description

The PPC hashed page table that is used almost as a secondary PTE cache by the processor. It is a finite size, so not all PTEs may be able to fit in it (hence why it is used as a secondary cache of sorts.

The size is set at initialisation time, and is based on the amount of available RAM.

Definition at line 36 of file HashedPageTable.h.

Member Function Documentation

void HashedPageTable::addMapping	(	uint32_t	effectiveAddress,
		uint32_t	physicalAddress,
		uint32_t	mode,
		uint32_t	vsid
	)

Adds a page table entry mapping effectiveAddress to physicalAddress for the given VSID, with mode 'mode'.

Parameters

effectiveAddress	The EA (virtual address) to map.
physicalAddress	The physical address to map to.
mode	The mode of the mapping - in VirtualAddressSpace form (VirtualAddressSpace::WriteThrough etc)
vsid	The virtual space identifier.

Todo:: change this to random replacement.

Definition at line 168 of file HashedPageTable.cc.

References VirtualAddressSpace::CacheDisable, VirtualAddressSpace::CopyOnWrite, FATAL, VirtualAddressSpace::Guarded, Hex, VirtualAddressSpace::KernelMode, VirtualAddressSpace::MemoryCoherent, panic(), VirtualAddressSpace::Write, and VirtualAddressSpace::WriteThrough.

Referenced by PPC32VirtualAddressSpace::map().

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uint32_t HashedPageTable::getMapping	(	uint32_t	effectiveAddress,
		uint32_t	vsid
	)

Returns the mapping for effectiveAddress in VSID. If there is no such mapping, the return value is undefined.

Definition at line 356 of file HashedPageTable.cc.

void HashedPageTable::initialise	(	Translations &	translations,
		uint32_t	ramMax
	)

Initialises the page table.

Todo:: Get rid of this hardcoded 0x200000.

Definition at line 63 of file HashedPageTable.cc.

References Translations::addTranslation(), VirtualAddressSpace::CacheDisable, Translations::findFreePhysicalMemory(), Translations::getNumTranslations(), Translations::getTranslation(), VirtualAddressSpace::Guarded, PPC32InterruptManager::initialiseProcessor(), OpenFirmware::instance(), HTABSize::mask, VirtualAddressSpace::MemoryCoherent, HTABSize::memorySize, panic(), HTABSize::size, VirtualAddressSpace::Write, and VirtualAddressSpace::WriteThrough.

HashedPageTable & HashedPageTable::instance ( )

static

Obtains the singleton instance of the HashedPageTable.

Definition at line 50 of file HashedPageTable.cc.

Referenced by PPC32VirtualAddressSpace::map(), and PPC32VirtualAddressSpace::unmap().

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bool HashedPageTable::isMapped	(	uint32_t	effectiveAddress,
		uint32_t	vsid
	)

Returns true if a mapping exists for effectiveAddress in the given VSID.

Definition at line 317 of file HashedPageTable.cc.

void HashedPageTable::removeMapping	(	uint32_t	effectiveAddress,
		uint32_t	vsid
	)

Removes a mapping for the given effective address, in the given VSID.

Definition at line 274 of file HashedPageTable.cc.

Referenced by PPC32VirtualAddressSpace::unmap().

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void HashedPageTable::setDBAT	(	size_t	n,
		uintptr_t	virt,
		physical_uintptr_t	phys,
		size_t	size,
		uint32_t	mode
	)

private

Set a DBAT entry

Definition at line 482 of file HashedPageTable.cc.

References VirtualAddressSpace::KernelMode, and panic().

void HashedPageTable::setIBAT	(	size_t	n,
		uintptr_t	virt,
		physical_uintptr_t	phys,
		size_t	size,
		uint32_t	mode
	)

private

Sets an IBAT entry

Definition at line 394 of file HashedPageTable.cc.

References VirtualAddressSpace::KernelMode, and panic().

Member Data Documentation

HashedPageTable HashedPageTable::m_Instance

staticprivate

The singleton instance.

Definition at line 135 of file HashedPageTable.h.

uint32_t HashedPageTable::m_Mask

private

The mask to use during hashing.

Definition at line 132 of file HashedPageTable.h.

PTEG* HashedPageTable::m_pHtab

private

Pointer to the HTAB.

Definition at line 126 of file HashedPageTable.h.

uint32_t HashedPageTable::m_Size

private

The size of the HTAB.

Definition at line 129 of file HashedPageTable.h.

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