Intel page directory implementation. More...

#include <IntelPageDirectory.h>

Public Member Functions
MemoryContext::Result	copy (IntelPageDirectory *directory, Address from, Address to)
	Copy mappings from another directory. More...

MemoryContext::Result	map (Address virt, Address phys, Memory::Access access, SplitAllocator *alloc)
	Map a virtual address to a physical address. More...

MemoryContext::Result	unmap (Address virt, SplitAllocator *alloc)
	Remove virtual address mapping. More...

MemoryContext::Result	translate (Address virt, Address phys, SplitAllocator alloc) const
	Translate virtual address to physical address. More...

MemoryContext::Result	access (Address virt, Memory::Access access, SplitAllocator alloc) const
	Get Access flags for a virtual address. More...

MemoryContext::Result	releaseSection (const Memory::Range range, SplitAllocator *alloc, const bool tablesOnly)
	Release memory sections. More...

MemoryContext::Result	releaseRange (const Memory::Range range, SplitAllocator *alloc)
	Release range of memory. More...

Private Member Functions
void	releasePhysical (SplitAllocator *alloc, const Address phys)
	Release a single physical page. More...

IntelPageTable *	getPageTable (Address virt, SplitAllocator *alloc) const
	Retrieve second level page table. More...

u32	flags (Memory::Access access) const
	Convert Memory::Access to page directory flags. More...

Private Attributes
u32	m_tables [1024]
	Array of page directory entries. More...

Detailed Description

Intel page directory implementation.

Definition at line 42 of file IntelPageDirectory.h.

Member Function Documentation

◆ access()

MemoryContext::Result IntelPageDirectory::access	(	Address	virt,
		Memory::Access *	access,
		SplitAllocator *	alloc
	)		const

Get Access flags for a virtual address.

Parameters

virt	Virtual address to get Access flags for.
access	MemoryAccess object pointer.
alloc	Memory allocator used by the caller

Returns: Result code.

Definition at line 122 of file IntelPageDirectory.cpp.

References IntelPageTable::access(), getPageTable(), and MemoryContext::InvalidAddress.

Referenced by IntelPaging::access(), flags(), and map().

◆ copy()

MemoryContext::Result IntelPageDirectory::copy	(	IntelPageDirectory *	directory,
		Address	from,
		Address	to
	)

Copy mappings from another directory.

Parameters

directory	Source page directory to copy from
from	Virtual address to start copy mapping from
to	End virtual address of mappings to copy

Returns: Result code

Definition at line 52 of file IntelPageDirectory.cpp.

References DIRENTRY, m_tables, MegaByte, and MemoryContext::Success.

Referenced by IntelPaging::initialize().

◆ flags()

u32 IntelPageDirectory::flags ( Memory::Access access ) const

private

Convert Memory::Access to page directory flags.

Parameters

access Input memory access flags

Returns: Page directory flags

Definition at line 133 of file IntelPageDirectory.cpp.

References access(), PAGE_USER, PAGE_WRITE, Memory::User, and Memory::Writable.

Referenced by map().

◆ getPageTable()

IntelPageTable * IntelPageDirectory::getPageTable	(	Address	virt,
		SplitAllocator *	alloc
	)		const

private

Retrieve second level page table.

Parameters

virt	Input virtual address to find second level page table for
alloc	Memory allocator for high/low translation

Returns: Pointer to second level page table

Definition at line 41 of file IntelPageDirectory.cpp.

References DIRENTRY, entry, m_tables, PAGE_PRESENT, PAGEMASK, SplitAllocator::toVirtual(), and ZERO.

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

◆ map()

MemoryContext::Result IntelPageDirectory::map	(	Address	virt,
		Address	phys,
		Memory::Access	access,
		SplitAllocator *	alloc
	)

Map a virtual address to a physical address.

Parameters

virt	Virtual address.
phys	Physical address.
access	Memory access flags.
alloc	Physical memory allocator for extra page tables.

Returns: Result code

Definition at line 64 of file IntelPageDirectory.cpp.

References access(), Allocator::Range::address, Allocator::Range::alignment, SplitAllocator::allocate(), DIRENTRY, flags(), getPageTable(), m_tables, IntelPageTable::map(), MemoryContext::OutOfMemory, PAGE_PRESENT, PAGE_WRITE, PAGESIZE, MemoryBlock::set(), Allocator::Range::size, and Allocator::Success.

Referenced by IntelPaging::map().

◆ releasePhysical()

void IntelPageDirectory::releasePhysical	(	SplitAllocator *	alloc,
		const Address	phys
	)

inlineprivate

Release a single physical page.

Parameters

alloc	Memory allocator to release memory from
phys	Physical address to release

Definition at line 143 of file IntelPageDirectory.cpp.

References Allocator::base(), SplitAllocator::isAllocated(), SplitAllocator::release(), and Allocator::size().

Referenced by releaseRange(), and releaseSection().

◆ releaseRange()

MemoryContext::Result IntelPageDirectory::releaseRange	(	const Memory::Range	range,
		SplitAllocator *	alloc
	)

Release range of memory.

Parameters

range	Memory range input
alloc	Memory allocator to release memory from

Returns: Result code.

Definition at line 163 of file IntelPageDirectory.cpp.

References getPageTable(), MemoryContext::InvalidAddress, PAGESIZE, releasePhysical(), Memory::Range::size, MemoryContext::Success, IntelPageTable::translate(), IntelPageTable::unmap(), Memory::Range::virt, and ZERO.

Referenced by IntelPaging::releaseRange().

◆ releaseSection()

MemoryContext::Result IntelPageDirectory::releaseSection	(	const Memory::Range	range,
		SplitAllocator *	alloc,
		const bool	tablesOnly
	)

Release memory sections.

Parameters

range	Memory range of the sections to release
alloc	Memory allocator to release memory from
tablesOnly	Set to true to only release page tables and not mapped pages.