MdePkg/Library/BaseLib/Ia32/WriteGdtr.c

   1 /** @file
   2   AsmWriteGdtr function
   3
   4   Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
   5   SPDX-License-Identifier: BSD-2-Clause-Patent
   6
   7 **/
   8
   9 #include "BaseLibInternals.h"
  10
  11 /**
  12   Writes the current Global Descriptor Table Register (GDTR) descriptor.
  13
  14   Writes and the current GDTR descriptor specified by Gdtr. This function is
  15   only available on IA-32 and x64.
  16
  17   @param  Gdtr  The pointer to a GDTR descriptor.
  18
  19 **/
  20 VOID
  21 EFIAPI
  22 InternalX86WriteGdtr (
  23   IN      CONST IA32_DESCRIPTOR  *Gdtr
  24   )
  25 {
  26   _asm {
  27     mov     eax, Gdtr
  28     lgdt    fword ptr [eax]
  29   }
  30 }