path: root/include/arch/x86_64/tables.h

#ifndef _JOVE_X86_64_TABLES_H
#define _JOVE_X86_64_TABLES_H 1

#include <stdint.h>

#define CD_SEGMENT_TYPE_ACCESSED 1
#define CD_SEGMENT_TYPE_WRITEABLE 2
#define CD_SEGMENT_TYPE_DATA_EXPAND_DOWN 4
#define CD_SEGMENT_TYPE_CODE_CONFORMING 4
#define CD_SEGMENT_TYPE_CODE 8

#define S_SEGMENT_TYPE_LDT 2
#define S_SEGMENT_TYPE_TSS_AVAIL 9
#define S_SEGMENT_TYPE_TSS_BUSY 11
#define S_SEGMENT_TYPE_CALLGATE 12
#define S_SEGMENT_TYPE_INT_GATE 14
#define S_SEGMENT_TYPE_TRAP_GATE 15

typedef struct segment_descriptor
{
    uint16_t limit_0_15;    /* Segment limit. */
    uint16_t base_0_15;     /* Segment base. */
    uint8_t base_16_23; 
    uint8_t type : 4;       /* Segment type. */
    uint8_t s : 1;          /* Descriptor type (0 = system, 1 = code/data)*/
    uint8_t dpl : 2;        /* Descriptor privilege level. */
    uint8_t p : 1;          /* Present. */
    uint8_t limit_16_19 : 4;
    uint8_t avl : 1;        /* Available for use by system software. */
    uint8_t l : 1;          /* 64-bit segment (Ext). */
    uint8_t d_b : 1;        /* Default operation size (0 = 16-bit, 1 = 32-bit)*/
    uint8_t g : 1;          /* Granularity. */
    uint8_t base_24_31;
}__attribute__((packed)) segment_descriptor_t;

typedef struct interrupt_gate
{
    uint16_t base_0_15;
    uint16_t segment_selector;
    uint8_t ist : 3;
    uint8_t zero_0 : 5;
    uint8_t type : 4;
    uint8_t zero_1 : 1;
    uint8_t dpl : 2;
    uint8_t p : 1;
    uint16_t base_16_31;
    uint32_t base_32_63;
    uint32_t resv;
}__attribute__((packed)) interrupt_gate_t;

struct XDTR /* Generic table descriptor struct */
{
    uint16_t length;
    uint64_t address;
}__attribute__((packed));

#endif