blob: d42587f282db520a1a8f6f75c8432bb49f163393 (
plain) (
blame)
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
|
#ifndef DEF_GDT_NS_H
#define DEF_GDT_NS_H
#include <common.h>
namespace GDT {
struct gdt_entry_t {
u16int limit_low;
u16int base_low;
u8int base_middle;
u8int access;
u8int granularity;
u8int base_high;
} __attribute__((packed));
// A struct describing a Task State Segment.
struct tss_entry_t {
u32int prev_tss; // The previous TSS - if we used hardware task switching this would form a linked list.
u32int esp0; // The stack pointer to load when we change to kernel mode.
u32int ss0; // The stack segment to load when we change to kernel mode.
u32int esp1; // Unused...
u32int ss1;
u32int esp2;
u32int ss2;
u32int cr3;
u32int eip;
u32int eflags;
u32int eax;
u32int ecx;
u32int edx;
u32int ebx;
u32int esp;
u32int ebp;
u32int esi;
u32int edi;
u32int es; // The value to load into ES when we change to kernel mode.
u32int cs; // The value to load into CS when we change to kernel mode.
u32int ss; // The value to load into SS when we change to kernel mode.
u32int ds; // The value to load into DS when we change to kernel mode.
u32int fs; // The value to load into FS when we change to kernel mode.
u32int gs; // The value to load into GS when we change to kernel mode.
u32int ldt; // Unused...
u16int trap;
u16int iomap_base;
u8int ioports[8192];
} __attribute__((packed));
struct gdt_ptr_t {
u16int limit;
u32int base;
} __attribute__((packed));
void init();
extern tss_entry_t tss_entry; //Used for setting kernel stack
}
#endif
|
