#pragma once

#define STA_X     0x8       // Executable segment
#define STA_W     0x2       // Writeable (non-executable segments)
#define STA_R     0x2       // Readable (executable segments)

// System segment type bits
#define STS_T32A    0x9     // Available 32-bit TSS
#define STS_IG32    0xE     // 32-bit Interrupt Gate
#define STS_TG32    0xF     // 32-bit Trap Gate

#define DPL_USER 3

#define FL_IF           0x00000200

#define SEG_KCODE 1
#define SEG_KDATA 2
#define SEG_UCODE 3
#define SEG_UDATA 4
#define SEG_TSS   5

#define SEG_ASM(type,base,lim)                                  \
        .word (((lim) >> 12) & 0xffff), ((base) & 0xffff);      \
        .byte (((base) >> 16) & 0xff), (0x90 | (type)),         \
                (0xC0 | (((lim) >> 28) & 0xf)), (((base) >> 24) & 0xff)

#define USER_BASE       0x400000 // 4 MB
#define USER_STACK_BASE 0xf00000 // 15 MB
#define KERN_STACK_BASE  0x90000

#ifndef __ASSEMBLER__
void load_gdt();
#endif