gdt.h File Reference

Data structures concerning the Global Descriptor Table (GDT). More...

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Classes
struct	gdt_descriptor_t
	Data structure representing a GDT descriptor. More...
struct	gdt_pointer_t
	Data structure used to load the GDT into the GDTR. More...

Macros
#define	IDT_PADDING   14U
	Used in IDT for padding.

Typedefs
typedef struct gdt_descriptor_t	_syscall0 = _syscall0( (packed) )= _syscall1( (packed) )= _syscall2( (packed) )= _syscall3( (packed) )= gdt_descriptor_t
	Data structure representing a GDT descriptor. More...

Enumerations
enum	gdt_bits_t {   GDT_PRESENT = 128U , GDT_KERNEL = 0U , GDT_USER = 96U , GDT_S = 16U ,   GDT_EX = 8U , GDT_DC = 4U , GDT_RW = 2U , GDT_AC = 1U ,   GDT_CODE = (GDT_S | GDT_EX) , GDT_DATA = (GDT_S | GDT_RW) , GDT_GRANULARITY = 128U , GDT_OPERAND_SIZE = 64U }
	Bitmasks used to access to specific bits of the GDT. More...

Functions
void	init_gdt (void)
	Initialise the GDT. More...
void	gdt_set_gate (uint8_t index, uint32_t base, uint32_t limit, uint8_t access, uint8_t granul)
	Sets the value of one GDT entry. More...

Detailed Description

Data structures concerning the Global Descriptor Table (GDT).

The Global Descriptor Table (GDT) is a data structure used by Intel x86-family processors starting with the 80286 in order to define the characteristics of the various memory areas used during program execution, including the base address, the size, and access privileges like executability and writability. These memory areas are called segments in Intel terminology.

Copyright

(c) 2014-2024 This file is distributed under the MIT License. See LICENSE.md for details.