MdePkg/Library/BaseLib/Ia32/WriteIdtr.c

   1 /** @file
   2   AsmWriteIdtr function
   3
   4   Copyright (c) 2006 - 2010, 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   Writes the current Interrupt Descriptor Table Register(GDTR) descriptor.
  14
  15   Writes the current IDTR descriptor and returns it in Idtr. This function is
  16   only available on IA-32 and x64.
  17
  18   @param  Idtr  The pointer to a IDTR descriptor.
  19
  20 **/
  21 VOID
  22 EFIAPI
  23 InternalX86WriteIdtr (
  24   IN      CONST IA32_DESCRIPTOR     *Idtr
  25   )
  26 {
  27   _asm {
  28     mov     eax, Idtr
  29     pushfd
  30     cli
  31     lidt    fword ptr [eax]
  32     popfd
  33   }
  34 }
  35