audk/MdePkg/Library/BaseLib/Ia32/ReadIdtr.c

/** @file
  AsmReadIdtr function

  Copyright (c) 2006 - 2008, Intel Corporation<BR>
  All rights reserved. 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"


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

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

  @param  Idtr  Pointer to a IDTR descriptor.

**/
VOID
EFIAPI
InternalX86ReadIdtr (
  OUT     IA32_DESCRIPTOR           *Idtr
  )
{
  _asm {
    mov     eax, Idtr
    sidt    fword ptr [eax]
  }
}