MdePkg/Library/BaseLib/Ia32/WriteLdtr.c

   1 /** @file
   2   AsmWriteLdtr 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 /**
  10   Writes the current Local Descriptor Table Register (GDTR) selector.
  11
  12   Writes and the current LDTR descriptor specified by Ldtr. This function is
  13   only available on IA-32 and x64.
  14
  15   @param  Ldtr  16-bit LDTR selector value.
  16
  17 **/
  18 VOID
  19 EFIAPI
  20 AsmWriteLdtr (
  21   IN UINT16  Ldtr
  22   )
  23 {
  24   _asm {
  25     xor     eax, eax
  26     mov     ax, Ldtr
  27     lldt    ax
  28   }
  29 }