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// MIT License, Copyright (c) 2021 Marvin Borner
#ifndef GDT_H
#define GDT_H
#include <def.h>
#define GDT_ROOT_CODE_GATE 1
#define GDT_ROOT_DATA_GATE 2
#define GDT_USER_CODE_GATE 3
#define GDT_USER_DATA_GATE 4
#define GDT_TSS_GATE 5
#define GDT_SUPER_CODE_OFFSET (gdt_offset(GDT_ROOT_CODE_GATE))
#define GDT_SUPER_DATA_OFFSET (gdt_offset(GDT_ROOT_DATA_GATE))
#define GDT_USER_CODE_OFFSET (gdt_offset(GDT_USER_CODE_GATE) | 3)
#define GDT_USER_DATA_OFFSET (gdt_offset(GDT_USER_DATA_GATE) | 3)
#define GDT_TSS_OFFSET (gdt_offset(GDT_TSS_GATE))
struct gdt_entry {
u16 limit_low;
u16 base_low;
u8 base_middle;
u8 access;
u8 granularity;
u8 base_high;
} PACKED;
struct gdt_ptr {
u16 limit;
void *base;
} PACKED;
struct tss_entry {
u32 prev_tss;
u32 esp0;
u32 ss0;
u32 esp1;
u32 ss1;
u32 esp2;
u32 ss2;
u32 cr3;
u32 eip;
u32 eflags;
u32 eax;
u32 ecx;
u32 edx;
u32 ebx;
u32 esp;
u32 ebp;
u32 esi;
u32 edi;
u32 es;
u32 cs;
u32 ss;
u32 ds;
u32 fs;
u32 gs;
u32 ldt;
u16 trap;
u16 iomap_base;
} PACKED;
CONST u8 gdt_offset(u8 gate);
void gdt_install(u32 esp);
void tss_set_stack(u32 esp);
#endif
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