MdePkg/Library/BaseLib/Ia32/WriteIdtr.c

   1 /** @file
   2   AsmWriteIdtr function
   3
   4   Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
   5   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 "BaseLibInternals.h"
  17
  18 /**
  19   Writes the current Interrupt Descriptor Table Register(GDTR) descriptor.
  20
  21   Writes the current IDTR descriptor and returns it in Idtr. This function is
  22   only available on IA-32 and x64.
  23
  24   @param  Idtr  Pointer to a IDTR descriptor.
  25
  26 **/
  27 VOID
  28 EFIAPI
  29 InternalX86WriteIdtr (
  30   IN      CONST IA32_DESCRIPTOR     *Idtr
  31   )
  32 {
  33   _asm {
  34     mov     eax, Idtr
  35     pushfd
  36     cli
  37     lidt    fword ptr [eax]
  38     popfd
  39   }
  40 }
  41