MdePkg/Library/BaseLib/Ia32/EnableCache.c

   1 /** @file
   2   AsmEnableCache 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   Perform a WBINVD and clear both the CD and NW bits of CR0.
  11
  12   Enables the caches by executing a WBINVD instruction and then clear both the CD and NW
  13   bits of CR0 to 0.  This function is only available on IA-32 and x64.
  14
  15 **/
  16 VOID
  17 EFIAPI
  18 AsmEnableCache (
  19   VOID
  20   )
  21 {
  22   _asm {
  23     wbinvd
  24     mov     eax, cr0
  25     btr     eax, 30
  26     btr     eax, 29
  27     mov     cr0, eax
  28   }
  29 }