InOsEmuPkg/Library/DxeEmuLib/DxeEmuLib.c

   1 /*++ @file
   2
   3 Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
   4 Portions copyright (c) 2011, Apple Inc. All rights reserved.
   5 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 <PiDxe.h>
  16
  17 #include <Library/DebugLib.h>
  18 #include <Library/HobLib.h>
  19 #include <Library/EmuThunkLib.h>
  20
  21 #include <Protocol/EmuThunk.h>
  22
  23
  24 EMU_THUNK_PROTOCOL   *gEmuThunk = NULL;
  25
  26
  27 /**
  28   The constructor function caches the pointer of EMU Thunk protocol.
  29
  30   @param  ImageHandle   The firmware allocated handle for the EFI image.
  31   @param  SystemTable   A pointer to the EFI System Table.
  32
  33   @retval EFI_SUCCESS   The constructor always returns EFI_SUCCESS.
  34
  35 **/
  36 EFI_STATUS
  37 EFIAPI
  38 DxeEmuLibConstructor (
  39   IN EFI_HANDLE        ImageHandle,
  40   IN EFI_SYSTEM_TABLE  *SystemTable
  41   )
  42 {
  43   EFI_HOB_GUID_TYPE        *GuidHob;
  44
  45   GuidHob = GetFirstGuidHob (&gEmuThunkProtocolGuid);
  46   ASSERT (GuidHob != NULL);
  47
  48   gEmuThunk = (EMU_THUNK_PROTOCOL *)(*(UINTN *)(GET_GUID_HOB_DATA (GuidHob)));
  49   ASSERT (gEmuThunk != NULL);
  50
  51   return EFI_SUCCESS;
  52 }