arion::GdtManager Class Reference

A class used to setup and interact with the Global Descriptor Table (GDT). More...

#include <gdt_manager.hpp>

Public Member Functions
	GdtManager (std::weak_ptr< Arion > arion)
void	setup ()
uint8_t	find_free_idx (uint8_t start_idx)
uint16_t	setup_selector (uint8_t idx, uint16_t flags)
uint32_t	get_segment_base (uint16_t selector)
void	insert_entry (uint8_t idx, uint32_t base, uint32_t limit, uint8_t access, uint8_t flags)

Static Public Member Functions
static std::unique_ptr< GdtManager >	initialize (std::weak_ptr< Arion > arion)

Private Member Functions
uint64_t	setup_entry (uint32_t base, uint32_t limit, uint8_t access, uint8_t flags)

Private Attributes
ADDR	gdt_addr
	The address where the GDT stands in memory.
std::weak_ptr< Arion >	arion
	The Arion instance this GdtManager instance is related to.

Detailed Description

A class used to setup and interact with the Global Descriptor Table (GDT).

Constructor & Destructor Documentation

GdtManager()

arion::GdtManager::GdtManager ( std::weak_ptr< Arion >  arion )

inline

A builder for GdtManager instances.

Parameters

[in]

arion

The Arion instance this GdtManager instance is related to.

Member Function Documentation

find_free_idx()

uint8_t arion::GdtManager::find_free_idx

(

uint8_t

start_idx

)

Retrieves the first free index in the GDT, where one segment descriptor can then be inserted.

Returns

The index.

get_segment_base()

uint32_t arion::GdtManager::get_segment_base

(

uint16_t

selector

)

Fetches a segment base address from the GDT, based on its corresponding selector.

Parameters

[in]

selector

The selector to identify the GDT segment.

Returns

The base address of the segment.

initialize()

static std::unique_ptr< GdtManager > arion::GdtManager::initialize ( std::weak_ptr< Arion >  arion )

static

Initializes the GdtManager instance.

Parameters

[in]

arion

The Arion instance this GdtManager instance is related to.

Returns

The initialized GdtManager.

insert_entry()

void arion::GdtManager::insert_entry	(	uint8_t	idx,
		uint32_t	base,
		uint32_t	limit,
		uint8_t	access,
		uint8_t	flags
	)

Builds and inserts an entry in the GDT, identifying a segment.

Parameters

[in]	idx	Index in the GDT.
[in]	base	The linear address where the segment begins.
[in]	limit	The maximum addressable unit.
[in]	access	The Access Byte which stores permissions over the segment.
[in]	flags	Additional flags.

setup()

void arion::GdtManager::setup

(

)

Used to GDT in memory and its mandatory segments.

setup_entry()

uint64_t arion::GdtManager::setup_entry ( uint32_t  base, uint32_t  limit, uint8_t  access, uint8_t  flags  )

private

Generates a segment descriptor to be added to the GDT.

Parameters

[in]	base	The linear address where the segment begins.
[in]	limit	The maximum addressable unit.
[in]	access	The Access Byte which stores permissions over the segment.
[in]	flags	Additional flags.

Returns

The segment descriptor.

setup_selector()

uint16_t arion::GdtManager::setup_selector	(	uint8_t	idx,
		uint16_t	flags
	)

Builds a segment selector, identifying the segment descriptor to use.

Parameters

[in]	idx	Index of the selector identifying the descriptor in its table.
[in]	flags	Flags related to the selector (table and privileges).

Returns

The selector.

Member Data Documentation

arion

std::weak_ptr<Arion> arion::GdtManager::arion

private

The Arion instance this GdtManager instance is related to.

gdt_addr

ADDR arion::GdtManager::gdt_addr

private

The address where the GDT stands in memory.

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

• /home/runner/work/Arion/Arion/include/arion/archs/x86/gdt_manager.hpp