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
  11
  12 /**
  13   Writes the current Local Descriptor Table Register (GDTR) selector.
  14
  15   Writes and the current LDTR descriptor specified by Ldtr. This function is
  16   only available on IA-32 and x64.
  17
  18   @param  Ldtr  16-bit LDTR selector value.
  19
  20 **/
  21 VOID
  22 EFIAPI
  23 AsmWriteLdtr (
  24   IN UINT16 Ldtr
  25   )
  26 {
  27   _asm {
  28     xor     eax, eax
  29     mov     ax, Ldtr
  30     lldt    ax
  31   }
  32 }
  33