X86GdtManager Class Reference

#include <gdt.h>

Collaboration diagram for X86GdtManager:

Classes
struct	segment_descriptor

Public Member Functions
void	initialise (size_t processorCount) INITIALISATION_ONLY
void	setTlsBase (uintptr_t base)

Static Public Member Functions
static X86GdtManager &	instance ()
static void	initialiseProcessor () INITIALISATION_ONLY

Private Member Functions
	X86GdtManager () INITIALISATION_ONLY
	X86GdtManager (const X86GdtManager &)
X86GdtManager &	operator= (const X86GdtManager &)
	~X86GdtManager ()
void	setSegmentDescriptor (size_t index, uint32_t base, uint32_t limit, uint8_t flags, uint8_t flags2)
void	setTssDescriptor (size_t index, uint32_t base) INITIALISATION_ONLY
void	initialiseTss (struct X86TaskStateSegment *pTss) INITIALISATION_ONLY
void	initialiseDoubleFaultTss (X86TaskStateSegment *pTss) INITIALISATION_ONLY

Private Attributes
struct X86GdtManager::segment_descriptor	PACKED
segment_descriptor *	m_Gdt
size_t	m_DescriptorCount

Static Private Attributes
static X86GdtManager	m_Instance

Detailed Description

The GDT manager on x86 processors

Definition at line 30 of file x86/gdt.h.

Constructor & Destructor Documentation

X86GdtManager::X86GdtManager ( )

private

The constructor

Definition at line 112 of file x86/gdt.cc.

Referenced by instance().

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X86GdtManager::X86GdtManager ( const X86GdtManager &  )

private

Copy constructor

Note

NOT implemented

X86GdtManager::~X86GdtManager ( )

private

The destructor

Definition at line 115 of file x86/gdt.cc.

Referenced by instance().

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Member Function Documentation

void X86GdtManager::initialise

(

size_t

processorCount

)

Initialise the GDT

Parameters

[in]

processorCount

the number of processors

Note

This should only be called from initialiseProcessor2()

Definition at line 30 of file x86/gdt.cc.

References Dec, Hex, Processor::information(), initialiseDoubleFaultTss(), initialiseTss(), m_DescriptorCount, m_Gdt, Processor::m_ProcessorInformation, NOTICE, setSegmentDescriptor(), and setTssDescriptor().

Referenced by instance().

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void X86GdtManager::initialiseDoubleFaultTss ( X86TaskStateSegment *  pTss )

private

Note

This doesn't seem to work??? I've used the current CR3 for now, but it's probably best to create a new PD for the DF handler.

Definition at line 158 of file x86/gdt.cc.

References VirtualAddressSpace::clone(), VirtualAddressSpace::getKernelAddressSpace(), NOTICE, and Processor::switchAddressSpace().

Referenced by initialise(), and instance().

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void X86GdtManager::initialiseProcessor ( )

static

Initialises this processors GDTR

Note

This should only be called from initialiseProcessor2()

Todo:

and some smp/acpi function

Definition at line 86 of file x86/gdt.cc.

References Processor::information(), m_DescriptorCount, m_Gdt, and m_Instance.

Referenced by instance().

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void X86GdtManager::initialiseTss ( struct X86TaskStateSegment *  pTss )

private

Write default values into a task-state-segment descriptor.

Parameters

[in]

pTss

The TSS descriptor.

Definition at line 145 of file x86/gdt.cc.

Referenced by initialise(), and instance().

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static X86GdtManager& X86GdtManager::instance ( )

inlinestatic

Get the gdt manager instance

Returns

instance of the gdt manager

Definition at line 35 of file x86/gdt.h.

References INITIALISATION_ONLY, initialise(), initialiseDoubleFaultTss(), initialiseProcessor(), initialiseTss(), m_Instance, operator=(), setSegmentDescriptor(), setTlsBase(), setTssDescriptor(), X86GdtManager(), and ~X86GdtManager().

X86GdtManager& X86GdtManager::operator= ( const X86GdtManager &  )

private

Assignment operator

Note

NOT implemented

Referenced by instance().

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void X86GdtManager::setSegmentDescriptor ( size_t  index, uint32_t  base, uint32_t  limit, uint8_t  flags, uint8_t  flags2  )

private

Set up a segment descriptor

Parameters

[in]	index	the descriptor index
[in]	base	the base address
[in]	limit	the size of the segment (either in bytes or in 4kb units)
[in]	flags	the flags
[in]	flags2	additional flags

Definition at line 131 of file x86/gdt.cc.

References X86GdtManager::segment_descriptor::base0, X86GdtManager::segment_descriptor::base1, X86GdtManager::segment_descriptor::base2, X86GdtManager::segment_descriptor::flags, X86GdtManager::segment_descriptor::flags_limit1, X86GdtManager::segment_descriptor::limit0, and m_Gdt.

Referenced by initialise(), instance(), setTlsBase(), and setTssDescriptor().

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void X86GdtManager::setTlsBase

(

uintptr_t

base

)

Sets up the TLS base for the current CPU to point to the given base.

Definition at line 119 of file x86/gdt.cc.

References Processor::information(), and setSegmentDescriptor().

Referenced by instance().

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void X86GdtManager::setTssDescriptor ( size_t  index, uint32_t  base  )

private

Set up a task-state-segment descriptor

Parameters

[in]	index	the descriptor index
[in]	base	the base address

Definition at line 141 of file x86/gdt.cc.

References setSegmentDescriptor().

Referenced by initialise(), and instance().

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Member Data Documentation

size_t X86GdtManager::m_DescriptorCount

private

The number of descriptors in the Gdt

Definition at line 104 of file x86/gdt.h.

Referenced by initialise(), and initialiseProcessor().

segment_descriptor* X86GdtManager::m_Gdt

private

The Gdt

Definition at line 102 of file x86/gdt.h.

Referenced by initialise(), initialiseProcessor(), and setSegmentDescriptor().

X86GdtManager X86GdtManager::m_Instance

staticprivate

The instance of the gdt manager

Definition at line 107 of file x86/gdt.h.

Referenced by initialiseProcessor(), and instance().

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

• x86/gdt.h
• x86/gdt.cc