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
  10 #include "BaseLibInternals.h"
  11
  12
  13 /**
  14   Writes the current Global Descriptor Table Register (GDTR) descriptor.
  15
  16   Writes and the current GDTR descriptor specified by Gdtr. This function is
  17   only available on IA-32 and x64.
  18
  19   @param  Gdtr  The pointer to a GDTR descriptor.
  20
  21 **/
  22 VOID
  23 EFIAPI
  24 InternalX86WriteGdtr (
  25   IN      CONST IA32_DESCRIPTOR     *Gdtr
  26   )
  27 {
  28   _asm {
  29     mov     eax, Gdtr
  30     lgdt    fword ptr [eax]
  31   }
  32 }
  33