MdePkg/Library/BaseLib/Ia32/WriteIdtr.c

/** @file
  AsmWriteIdtr function

  Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
  This program and the accompanying materials
  are licensed and made available under the terms and conditions of the BSD License
  which accompanies this distribution.  The full text of the license may be found at
  http://opensource.org/licenses/bsd-license.php.

  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

**/


#include "BaseLibInternals.h"

/**
  Writes the current Interrupt Descriptor Table Register(GDTR) descriptor.

  Writes the current IDTR descriptor and returns it in Idtr. This function is
  only available on IA-32 and x64.

  @param  Idtr  The pointer to a IDTR descriptor.

**/
VOID
EFIAPI
InternalX86WriteIdtr (
  IN      CONST IA32_DESCRIPTOR     *Idtr
  )
{
  _asm {
    mov     eax, Idtr
    pushfd
    cli
    lidt    fword ptr [eax]
    popfd
  }
}