gdt.h File Reference

#include <stdint.h>

Go to the source code of this file.

Data Structures
struct	cpu_gdt_entry
struct	cpu_gdt_register

Macros
#define	GDT_LONG_MODE   0x20
#define	GDT_PRESENT   0x80
#define	GDT_RING_0   0x00
#define	GDT_RING_1   0x20
#define	GDT_RING_2   0x40
#define	GDT_RING_3   0x60
#define	GDT_CONFORMING   0x04
#define	GDT_SEGMENTS   3
#define	GDT_NULL_OFFSET   0x00
#define	GDT_KCODE   0x08
#define	GDT_KCODE_LIMIT   0
#define	GDT_KCODE_BASE   0
#define	GDT_KCODE_MISC_LOW   GDT_PRESENT + GDT_RING_0
#define	GDT_KCODE_MISC_HIGH   GDT_LONG_MODE
#define	GDT_KDATA   0x10
#define	GDT_KDATA_LIMIT   0
#define	GDT_KDATA_BASE   0
#define	GDT_KDATA_MISC_LOW   GDT_PRESENT
#define	GDT_KDATA_MISC_HIGH   0
#define	GDT_ENTRY_CREATE(lim, base, low, high)

Functions
struct cpu_gdt_entry	__attribute__ ((packed))
void	cpu_gdt_bind (void)
void	cpu_gdt_describe (char *buf, uint64_t bufsz)

Variables
uint16_t	limit_low
uint16_t	base_low
uint8_t	base_med
uint8_t	present_dpl_and_conform
uint8_t	flags_and_limit_high
uint8_t	base_high
uint16_t	limit
uint64_t	base

Macro Definition Documentation

GDT_CONFORMING

#define GDT_CONFORMING   0x04

GDT_ENTRY_CREATE

#define GDT_ENTRY_CREATE	(		lim,
			base,
			low,
			high
	)

Value:

        { \
        lim & 0xffff,        /* Segment limit (low) */ \
        base  & 0xffff,      /* Base Address  (low) */ \
        (base >> 16) & 0xff, /* Base Address  (med) */ \
        low,                 /* Present/DPL/Conform */ \
        high + (lim >> 16),  /* Flags/Limit  (high) */ \
        base >> 24,          /* Base Address (high) */ \
}

GDT_KCODE

#define GDT_KCODE   0x08

GDT_KCODE_BASE

#define GDT_KCODE_BASE   0

GDT_KCODE_LIMIT

#define GDT_KCODE_LIMIT   0

GDT_KCODE_MISC_HIGH

#define GDT_KCODE_MISC_HIGH   GDT_LONG_MODE

GDT_KCODE_MISC_LOW

#define GDT_KCODE_MISC_LOW   GDT_PRESENT + GDT_RING_0

GDT_KDATA

#define GDT_KDATA   0x10

GDT_KDATA_BASE

#define GDT_KDATA_BASE   0

GDT_KDATA_LIMIT

#define GDT_KDATA_LIMIT   0

GDT_KDATA_MISC_HIGH

#define GDT_KDATA_MISC_HIGH   0

GDT_KDATA_MISC_LOW

#define GDT_KDATA_MISC_LOW   GDT_PRESENT

GDT_LONG_MODE

#define GDT_LONG_MODE   0x20

GDT_NULL_OFFSET

#define GDT_NULL_OFFSET   0x00

GDT_PRESENT

#define GDT_PRESENT   0x80

GDT_RING_0

#define GDT_RING_0   0x00

GDT_RING_1

#define GDT_RING_1   0x20

GDT_RING_2

#define GDT_RING_2   0x40

GDT_RING_3

#define GDT_RING_3   0x60

GDT_SEGMENTS

#define GDT_SEGMENTS   3

Function Documentation

__attribute__()

struct cpu_gdt_entry __attribute__

(

(packed)

)

cpu_gdt_bind()

void cpu_gdt_bind

(

void

)

cpu_gdt_describe()

void cpu_gdt_describe	(	char *	buf,
		uint64_t	bufsz
	)

Variable Documentation

base

uint64_t base

base_high

uint8_t base_high

base_low

uint16_t base_low

base_med

uint8_t base_med

flags_and_limit_high

uint8_t flags_and_limit_high

limit

uint16_t limit

limit_low

uint16_t limit_low

present_dpl_and_conform

uint8_t present_dpl_and_conform