arch/x86_64/tables.h


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60

#ifndef JOVE_ARCH_X86_64_TABLES_H
#define JOVE_ARCH_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

struct SegmentDescriptor
{
    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));

struct InterruptTrapGate
{
    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;

}__attribute__((packed));

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

void x86_64_load_gdt(void);
void x86_64_load_idt(void);

#endif