gdt.h File Reference

#include <kernel/cpu/tss.h>
#include <kernel/defs.h>
#include <stdint.h>

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Data Structures
struct	gdt_desc_t
	GDT descriptor structure. More...
struct	gdt_segment_t
	A single GDT segment descriptor. More...
struct	gdt_long_system_segment_t
	A long mode system segment descriptor, used for TSS and LDT. More...
struct	gdt_t
	The actual GDT structure. More...

Enumerations
enum	gdt_ring_t { GDT_RING0 = 0 , GDT_RING1 = 1 , GDT_RING2 = 2 , GDT_RING3 = 3 }
enum	gdt_segment_selector_t {   GDT_NULL = 0 , GDT_KERNEL_CODE = 0x08 , GDT_KERNEL_DATA = 0x10 , GDT_USER_DATA = 0x18 ,   GDT_USER_CODE = 0x20 , GDT_TSS = 0x28 , GDT_CS_RING0 = GDT_KERNEL_CODE | GDT_RING0 , GDT_SS_RING0 = GDT_KERNEL_DATA | GDT_RING0 ,   GDT_CS_RING3 = GDT_USER_CODE | GDT_RING3 , GDT_SS_RING3 = GDT_USER_DATA | GDT_RING3 }
	Segment selectors. More...
enum	gdt_access_t {   GDT_ACCESS_ACCESSED = 1 << 0 , GDT_ACCESS_READ_WRITE = 1 << 1 , GDT_ACCESS_DIRECTION_CONFORMING = 1 << 2 , GDT_ACCESS_EXEC = 1 << 3 ,   GDT_ACCESS_SYSTEM = 0 << 4 , GDT_ACCESS_DATA_CODE = 1 << 4 , GDT_ACCESS_TYPE_LDT = 0x2 , GDT_ACCESS_TYPE_TSS_AVAILABLE = 0x9 ,   GDT_ACCESS_TYPE_TSS_BUSY = 0xB , GDT_ACCESS_RING0 = 0 << 5 , GDT_ACCESS_RING1 = 1 << 5 , GDT_ACCESS_RING2 = 2 << 5 ,   GDT_ACCESS_RING3 = 3 << 5 , GDT_ACCESS_PRESENT = 1 << 7 }
	Access byte. More...
enum	gdt_flags_t {   GDT_FLAGS_NONE = 0 , GDT_FLAGS_RESERVED = 1 << 0 , GDT_FLAGS_LONG_MODE = 1 << 1 , GDT_FLAGS_SIZE = 1 << 2 ,   GDT_FLAGS_4KB = 1 << 3 }
	Flags byte. More...

Functions
void	gdt_load_descriptor (gdt_desc_t *descriptor)
	Loads a GDT descriptor.
void	gdt_init (void)
	Initialize the GDT.
void	gdt_cpu_load (void)
	Load the GDT on the current CPU.
void	gdt_cpu_tss_load (tss_t *tss)
	Load a TSS into the GDT and load it using the ltr instruction on the current CPU.