IntelFrameworkModulePkg/Library/GenericBdsLib/Ipf/ShadowRom.c

   1 /** @file
   2   Shadow all option rom
   3
   4 Copyright (c) 2004 - 2010, Intel Corporation. <BR>
   5 All rights reserved. This program and the accompanying materials
   6 are licensed and made available under the terms and conditions of the BSD License
   7 which accompanies this distribution.  The full text of the license may be found at
   8 http://opensource.org/licenses/bsd-license.php
   9
  10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13 **/
  14
  15 #include "InternalBdsLib.h"
  16
  17 UINT8 mShadowRomFlag = 0;
  18
  19 /**
  20   Shadow all opton ROM if the it is not done.
  21 **/
  22 VOID
  23 EFIAPI
  24 ShadowAllOptionRom(
  25   VOID
  26   )
  27 {
  28   EFI_STATUS                Status;
  29   EFI_LEGACY_BIOS_PROTOCOL  *LegacyBios;
  30   //
  31   // Rom shadow only do once.
  32   //
  33   if (mShadowRomFlag == 0) {
  34     Status = gBS->LocateProtocol (
  35                     &gEfiLegacyBiosProtocolGuid,
  36                     NULL,
  37                     (VOID **) &LegacyBios
  38                     );
  39     if (!EFI_ERROR (Status)) {
  40       LegacyBios->PrepareToBootEfi (LegacyBios, NULL, NULL);
  41     }
  42
  43     mShadowRomFlag = 1;
  44   }
  45
  46   return ;
  47 }