The Stack of pages (below4GB, below64GB, no constraint). More...

Collaboration diagram for X86CommonPhysicalMemoryManager::PageStack:

Public Member Functions
	PageStack () INITIALISATION_ONLY

physical_uintptr_t	allocate (size_t constraints, bool waitForReady=true)

void	free (uint64_t physicalAddress, size_t length, bool newMemory=false)

	~PageStack ()

size_t	freePages () const

size_t	totalPages () const

Protected Member Functions
void	markAbove4GReady ()

void	markBelow4GReady ()

Private Member Functions
	PageStack (const PageStack &)

PageStack &	operator= (const PageStack &)

void	initialise ()

bool	maybeMap (size_t index, uint64_t physicalAddress)

Private Attributes
void *	m_Stack [StackCount]

size_t	m_StackMax [StackCount]

size_t	m_StackSize [StackCount]

size_t	m_FreePages

size_t	m_TotalPages

size_t	m_DesiredCapacity [StackCount]

Atomic< bool >	m_StackReady [StackCount]

Static Private Attributes
static const size_t	StackCount = 3

Friends
class	X86CommonPhysicalMemoryManager

Detailed Description

The Stack of pages (below4GB, below64GB, no constraint).

The actual page stack contains is a Stack of the pages with the constraints below4GB and below64GB and those pages without address size constraints.

Definition at line 119 of file kernel/core/processor/x86_common/PhysicalMemoryManager.h.

Constructor & Destructor Documentation

◆ PageStack() [1/2]

X86CommonPhysicalMemoryManager::PageStack::PageStack ( )

Default constructor does nothing

Definition at line 1012 of file x86_common/PhysicalMemoryManager.cc.

◆ ~PageStack()

X86CommonPhysicalMemoryManager::PageStack::~PageStack ( )

inline

The destructor does nothing

Definition at line 136 of file kernel/core/processor/x86_common/PhysicalMemoryManager.h.

◆ PageStack() [2/2]

X86CommonPhysicalMemoryManager::PageStack::PageStack ( const PageStack & )

private

The copy-constructor

Note: Not implemented

Member Function Documentation

◆ allocate()

physical_uintptr_t X86CommonPhysicalMemoryManager::PageStack::allocate	(	size_t	constraints,
		bool	waitForReady = `true`
	)

Allocate a page with certain constraints

Parameters

[in] constraints either below4GB or below64GB or 0

Returns: The physical address of the allocated page or 0

Note: Testing.

Definition at line 876 of file x86_common/PhysicalMemoryManager.cc.

References PhysicalMemoryManager::below4GB, PhysicalMemoryManager::below64GB, g_FreePages, initialise(), m_FreePages, m_Stack, m_StackReady, m_StackSize, and ProcessorBase::pause().

Referenced by HostedPhysicalMemoryManager::allocatePage(), and X86CommonPhysicalMemoryManager::allocatePage().

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◆ free()

void X86CommonPhysicalMemoryManager::PageStack::free	(	uint64_t	physicalAddress,
		size_t	length,
		bool	newMemory = `false`
	)

Free a physical page

Parameters

[in] physicalAddress physical address of the page

Todo:: make sure callers split any regions that cross over before calling

Note: Testing.

Definition at line 949 of file x86_common/PhysicalMemoryManager.cc.

References g_FreePages, PhysicalMemoryManager::getPageSize(), X86CommonPhysicalMemoryManager::initialise(), panic(), physicalAddress(), and UNLIKELY.

Referenced by HostedPhysicalMemoryManager::freePageUnlocked(), X86CommonPhysicalMemoryManager::freePageUnlocked(), HostedPhysicalMemoryManager::initialise(), X86CommonPhysicalMemoryManager::initialise(), and X86CommonPhysicalMemoryManager::initialise64().

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◆ freePages()

size_t X86CommonPhysicalMemoryManager::PageStack::freePages ( ) const

inline

Definition at line 138 of file kernel/core/processor/x86_common/PhysicalMemoryManager.h.

◆ initialise()

void X86CommonPhysicalMemoryManager::PageStack::initialise ( )

private

Initialize the stacks if needed. This is needed to avoid a dependency on the order of construction of VirtualAddressSpace objects for the kernel address space. Otherwise we can try to get page stack addresses from an unconstructed VirtualAddressSpace object.

Definition at line 1034 of file x86_common/PhysicalMemoryManager.cc.

References VirtualAddressSpace::getKernelAddressSpace(), VirtualAddressSpace::getKernelVirtualPagestack(), VirtualAddressSpace::getKernelVirtualPagestackAdd1(), VirtualAddressSpace::getKernelVirtualPagestackAdd2(), and LIKELY.

Referenced by allocate().

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