IntelPaging Class Reference

Intel virtual memory implementation. More...

#include <IntelPaging.h>

Inheritance diagram for IntelPaging:

Public Member Functions
	IntelPaging (MemoryMap *map, SplitAllocator *alloc)
	Constructor. More...
	IntelPaging (MemoryMap *map, Address pageDirectory, SplitAllocator *alloc)
	Constructor. More...
virtual	~IntelPaging ()
	Destructor. More...
virtual Result	initialize ()
	Initialize the MemoryContext. More...
virtual Result	activate (bool initializeMMU=false)
	Activate the MemoryContext. More...
virtual Result	map (Address virt, Address phys, Memory::Access access)
	Map a physical page to a virtual address. More...
virtual Result	unmap (Address virt)
	Unmap a virtual address. More...
virtual Result	lookup (Address virt, Address *phys) const
	Translate virtual address to physical address. More...
virtual Result	access (Address virt, Memory::Access *access) const
	Get Access flags for a virtual address. More...
virtual Result	releaseSection (const Memory::Range &range, const bool tablesOnly=false)
	Release memory sections. More...
virtual Result	releaseRange (Memory::Range *range)
	Release range of memory. More...
Public Member Functions inherited from MemoryContext
	MemoryContext (MemoryMap *map, SplitAllocator *alloc)
	Constructor. More...
virtual	~MemoryContext ()
	Destructor. More...
virtual Result	mapRangeContiguous (Memory::Range *range)
	Map a range of contiguous physical pages to virtual addresses. More...
virtual Result	mapRangeSparse (Memory::Range *range)
	Map and allocate a range of sparse (non-contiguous) physical pages to virtual addresses. More...
virtual Result	unmapRange (Memory::Range *range)
	Unmaps a range of virtual memory. More...
virtual Result	release (Address virt)
	Release a memory page mapping. More...
virtual Result	findFree (Size size, MemoryMap::Region region, Address *virt) const
	Find unused memory. More...
virtual void	mapRangeSparseCallback (Address *phys)
	Callback to provide intermediate Range object during mapRangeSparse() More...

Private Attributes
IntelPageDirectory *	m_pageDirectory
	Pointer to page directory in kernel's virtual memory. More...
Address	m_pageDirectoryAddr
	Physical address of the page directory. More...
bool	m_pageDirectoryAllocated
	Set to true if page directory was allocated by this class. More...

Additional Inherited Members
Public Types inherited from MemoryContext
enum	Result {   Success, InvalidAddress, InvalidSize, AlreadyExists,   OutOfMemory }
	Result codes. More...
typedef enum MemoryContext::Result	Result
	Result codes. More...
Static Public Member Functions inherited from MemoryContext
static MemoryContext *	getCurrent ()
	Get currently active MemoryContext. More...
Protected Attributes inherited from MemoryContext
SplitAllocator *	m_alloc
	Physical memory allocator. More...
MemoryMap *	m_map
	Virtual memory layout. More...
Callback< MemoryContext, Address >	m_mapRangeSparseCallback
	Callback object for mapRangeSparseCallback function. More...
Memory::Range *	m_savedRange
	Saved range input for use in the mapRangeSparse Callback. More...
Size	m_numSparsePages
	Number of pages allocated via mapRangeSparse Callback. More...
Static Protected Attributes inherited from MemoryContext
static MemoryContext *	m_current = 0
	The currently active MemoryContext. More...

Detailed Description

Intel virtual memory implementation.

Definition at line 43 of file IntelPaging.h.

Constructor & Destructor Documentation

IntelPaging() [1/2]

IntelPaging::IntelPaging	(	MemoryMap *	map,
		SplitAllocator *	alloc
	)

Constructor.

Allocates new page tables for the paged memory context.

Parameters

map	Virtual memory map.
alloc	Allocator for physical memory page allocations.

Definition at line 23 of file IntelPaging.cpp.

IntelPaging() [2/2]

IntelPaging::IntelPaging	(	MemoryMap *	map,
		Address	pageDirectory,
		SplitAllocator *	alloc
	)

Constructor.

Assign the given page directory to this paged memory context. This constructor does not allocate new page tables.

Parameters

map	Virtual memory map.
pageDirectory	Physical address of the page directory to use.
alloc	Allocator for physical memory page allocations.

Definition at line 31 of file IntelPaging.cpp.

~IntelPaging()

IntelPaging::~IntelPaging ( )

virtual

Destructor.

Definition at line 39 of file IntelPaging.cpp.

References MemoryContext::m_alloc, m_pageDirectoryAddr, m_pageDirectoryAllocated, and SplitAllocator::release().

Member Function Documentation

access()

MemoryContext::Result IntelPaging::access ( Address  virt, Memory::Access *  access  ) const

virtual

Get Access flags for a virtual address.

Parameters

virt	Virtual address to get Access flags for.
access	MemoryAccess object pointer.

Returns

Result code.

Implements MemoryContext.

Definition at line 130 of file IntelPaging.cpp.

References IntelPageDirectory::access(), MemoryContext::m_alloc, and m_pageDirectory.

activate()

MemoryContext::Result IntelPaging::activate ( bool  initializeMMU = false )

virtual

Activate the MemoryContext.

This function applies this MemoryContext on the hardware MMU.

Parameters

initializeMMU

If true perform (re)initialization of the MMU

Returns

Result code.

Implements MemoryContext.

Definition at line 95 of file IntelPaging.cpp.

References MemoryContext::m_current, m_pageDirectoryAddr, MemoryContext::Success, and IntelCore::writeCR3().

Referenced by IntelKernel::IntelKernel().

initialize()

MemoryContext::Result IntelPaging::initialize ( )

virtual

Initialize the MemoryContext.

Returns

Result code

Implements MemoryContext.

Definition at line 47 of file IntelPaging.cpp.

References Allocator::Range::address, Allocator::Range::alignment, SplitAllocator::allocate(), IntelPageDirectory::copy(), MemoryMap::KernelData, MemoryMap::KernelPrivate, MemoryContext::m_alloc, MemoryContext::m_map, m_pageDirectory, m_pageDirectoryAddr, m_pageDirectoryAllocated, MemoryContext::OutOfMemory, MemoryMap::range(), IntelCore::readCR3(), MemoryBlock::set(), Memory::Range::size, Allocator::Range::size, MemoryContext::Success, Allocator::Success, SplitAllocator::toVirtual(), and Memory::Range::virt.

Referenced by IntelKernel::IntelKernel().

lookup()

MemoryContext::Result IntelPaging::lookup ( Address  virt, Address *  phys  ) const

virtual

Translate virtual address to physical address.

Parameters

virt	Virtual address to lookup
phys	Translated physical memory address on output

Returns

Result code

Implements MemoryContext.

Definition at line 125 of file IntelPaging.cpp.

References MemoryContext::m_alloc, m_pageDirectory, and IntelPageDirectory::translate().

map()

MemoryContext::Result IntelPaging::map ( Address  virt, Address  phys, Memory::Access  access  )

virtual

Map a physical page to a virtual address.

Parameters

virt	Virtual address.
phys	Physical address.
access	Memory access flags.

Returns

Result code

Implements MemoryContext.

Definition at line 103 of file IntelPaging.cpp.

References MemoryContext::m_alloc, MemoryContext::m_current, m_pageDirectory, IntelPageDirectory::map(), MemoryContext::Success, and tlb_flush.

releaseRange()

MemoryContext::Result IntelPaging::releaseRange ( Memory::Range *  range )

virtual

Release range of memory.

Parameters

range

Memory range input

Returns

Result code.

Implements MemoryContext.

Definition at line 141 of file IntelPaging.cpp.

References MemoryContext::m_alloc, m_pageDirectory, and IntelPageDirectory::releaseRange().

releaseSection()

MemoryContext::Result IntelPaging::releaseSection ( const Memory::Range &  range, const bool  tablesOnly = false  )

virtual

Release memory sections.

Deallocate all associated physical memory which resides in the given memory section range.

Parameters

range	Range of memory sections to release
tablesOnly	True to only release associated page tables and do not release the actual mapped pages

Returns

Result code

Implements MemoryContext.

Definition at line 135 of file IntelPaging.cpp.

References MemoryContext::m_alloc, m_pageDirectory, and IntelPageDirectory::releaseSection().

unmap()

MemoryContext::Result IntelPaging::unmap ( Address  virt )

virtual

Unmap a virtual address.

This function removes a virtual to physical memory mapping without deallocating any physical memory.

Parameters

virt	Virtual address to unmap.

Returns

Result code

Implements MemoryContext.

Definition at line 114 of file IntelPaging.cpp.

References MemoryContext::m_alloc, MemoryContext::m_current, m_pageDirectory, MemoryContext::Success, tlb_flush, and IntelPageDirectory::unmap().

Field Documentation

m_pageDirectory

IntelPageDirectory* IntelPaging::m_pageDirectory

private

Pointer to page directory in kernel's virtual memory.

Definition at line 162 of file IntelPaging.h.

Referenced by access(), initialize(), lookup(), map(), releaseRange(), releaseSection(), and unmap().

m_pageDirectoryAddr

Address IntelPaging::m_pageDirectoryAddr

private

Physical address of the page directory.

Definition at line 165 of file IntelPaging.h.

Referenced by activate(), initialize(), and ~IntelPaging().

m_pageDirectoryAllocated

bool IntelPaging::m_pageDirectoryAllocated

private

Set to true if page directory was allocated by this class.

Definition at line 168 of file IntelPaging.h.

Referenced by initialize(), and ~IntelPaging().

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

• lib/libarch/intel/IntelPaging.h
• lib/libarch/intel/IntelPaging.cpp