MdePkg/Library/BaseLib/Ia32/ReadGdtr.c

   1 /** @file
   2   AsmReadGdtr 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   Reads the current Global Descriptor Table Register(GDTR) descriptor.
  15
  16   Reads and returns the current GDTR descriptor and returns it in Gdtr. This
  17   function is only available on IA-32 and x64.
  18
  19   @param  Gdtr  The pointer to a GDTR descriptor.
  20
  21 **/
  22 VOID
  23 EFIAPI
  24 InternalX86ReadGdtr (
  25   OUT IA32_DESCRIPTOR  *Gdtr
  26   )
  27 {
  28   _asm {
  29     mov     eax, Gdtr
  30     sgdt    fword ptr [eax]
  31   }
  32 }
  33