MdePkg/Library/BaseLib/Ia32/ReadIdtr.c

   1 /** @file
   2   AsmReadIdtr function
   3
   4   Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
   5   SPDX-License-Identifier: BSD-2-Clause-Patent
   6
   7 **/
   8
   9 #include "BaseLibInternals.h"
  10
  11 /**
  12   Reads the current Interrupt Descriptor Table Register(GDTR) descriptor.
  13
  14   Reads and returns the current IDTR descriptor and returns it in Idtr. This
  15   function is only available on IA-32 and x64.
  16
  17   @param  Idtr  The pointer to a IDTR descriptor.
  18
  19 **/
  20 VOID
  21 EFIAPI
  22 InternalX86ReadIdtr (
  23   OUT     IA32_DESCRIPTOR  *Idtr
  24   )
  25 {
  26   _asm {
  27     mov     eax, Idtr
  28     sidt    fword ptr [eax]
  29   }
  30 }