fixed addr gdt, serial

stage_2/main.s

@@ -36,6 +36,12 @@ s2_main:
   mov cx, 0x3f00
   int 0x10
 
+  ; Copy the GDT
+  mov cx, GDT_FLAT_LEN
+  mov si, gdt_flat
+  mov di, GDT_ADDR
+  rep movsb
+
   ; Ensure interrupts are definitely disabled.
   cli
 
@@ -124,7 +130,6 @@ global gdt_flat_slice
 ; - 7: present (must be set)
 ;
 
-; FIXME: copy this to a fixed memory location
 align 8
 gdt_flat:
   ; First GDT entry must be 0.
@@ -161,8 +166,6 @@ gdt_flat:
      11001111b,  \
      0x00
 
-global gdt_flat
-
 GDT_FLAT_LEN equ ($ - gdt_flat)
 
 GDT_FLAT_IDX_CODE_32 equ (gdt_flat.segment_code_32 - gdt_flat)