Added Global Descriptor Table(GDT)...not working yet(as always)

kernel/cpu/Makefile

@@ -1,4 +1,4 @@
-OBJS = multiboot.asm.o kernel_loader.asm.o ports.asm.o
+OBJS = multiboot.asm.o kernel_loader.asm.o ports.asm.o gdt.asm.o
 
 ASM = nasm
 ASMFLAGS = -f elf

kernel/cpu/gdt.asm

@@ -0,0 +1,15 @@
+global gdt_flush ; for drivers/gdt.c
+
+section .text
+gdt_flush:
+    mov eax, [esp+4] ; get address of gdt_ptr_t
+    lgdt [eax]  ; Load GDT
+    mov ax, 0x10 ; offset in the GDT of the data segment
+    mov ds, ax ; Load data segment selectors
+    mov es, ax
+    mov fs, ax
+    mov gs, ax
+    mov ss, ax
+    jmp 0x08:.flush ; offset in the GDT of the code segment
+.flush:
+    ret