MdePkg/Library/BaseLib/Ia32/WriteIdtr.c

   1 /** @file
   2   AsmWriteIdtr function
   3
   4   Copyright (c) 2006 - 2007, Intel Corporation<BR>
   5   All rights reserved. This program and the accompanying materials
   6   are licensed and made available under the terms and conditions of the BSD License
   7   which accompanies this distribution.  The full text of the license may be found at
   8   http://opensource.org/licenses/bsd-license.php
   9
  10   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13 **/
  14
  15 //
  16 // Include common header file for this module.
  17 //
  18 #include <BaseLibInternals.h>
  19
  20 /**
  21   Writes the current Interrupt Descriptor Table Register(GDTR) descriptor.
  22
  23   Writes the current IDTR descriptor and returns it in Idtr. This function is
  24   only available on IA-32 and X64.
  25
  26   @param  Idtr  Pointer to a IDTR descriptor.
  27
  28 **/
  29 VOID
  30 EFIAPI
  31 InternalX86WriteIdtr (
  32   IN      CONST IA32_DESCRIPTOR     *Idtr
  33   )
  34 {
  35   _asm {
  36     mov     eax, Idtr
  37     lidt    fword ptr [eax]
  38   }
  39 }
  40