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 #include "BaseLibInternals.h"
  10
  11 /**
  12   Writes the current Interrupt Descriptor Table Register(GDTR) descriptor.
  13
  14   Writes the current IDTR descriptor and returns it in Idtr. This function is
  15   only available on IA-32 and x64.
  16
  17   @param  Idtr  The pointer to a IDTR descriptor.
  18
  19 **/
  20 VOID
  21 EFIAPI
  22 InternalX86WriteIdtr (
  23   IN      CONST IA32_DESCRIPTOR  *Idtr
  24   )
  25 {
  26   _asm {
  27     mov     eax, Idtr
  28     pushfd
  29     cli
  30     lidt    fword ptr [eax]
  31     popfd
  32   }
  33 }