A update

gdt.asm

@@ -0,0 +1,15 @@
+global gdt_flush
+
+gdt_flush:
+    mov eax, [esp + 4]
+    lgdt [eax]
+    ; Reload segment registers
+    mov ax, 0x10       ; Kernel data segment
+    mov ds, ax
+    mov es, ax
+    mov fs, ax
+    mov gs, ax
+    mov ss, ax
+    jmp 0x08:.flush    ; Kernel code segment
+.flush:
+    ret