MdePkg/Library/DxeServicesTableLib/DxeServicesTableLib.c

   1 /** @file
   2   DXE Library.
   3
   4   Copyright (c) 2006, 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   Module Name:  DxeServicesTableLib.c
  14
  15 **/
  16
  17 //
  18 // The package level header files this module uses
  19 //
  20 #include <PiDxe.h>
  21 //
  22 // The protocols, PPI and GUID defintions for this module
  23 //
  24 #include <Guid/DxeServices.h>
  25 //
  26 // The Library classes this module consumes
  27 //
  28 #include <Library/DxeServicesTableLib.h>
  29 #include <Library/DebugLib.h>
  30 #include <Library/UefiLib.h>
  31
  32 //
  33 // Cache copy of the DXE Services Table
  34 //
  35 EFI_DXE_SERVICES  *gDS      = NULL;
  36
  37 /**
  38   The constructor function caches the pointer of DXE Services Table.
  39
  40   The constructor function caches the pointer of DXE Services Table.
  41   It will ASSERT() if that operation fails.
  42   It will ASSERT() if the pointer of DXE Services Table is NULL.
  43   It will always return EFI_SUCCESS.
  44
  45   @param  ImageHandle   The firmware allocated handle for the EFI image.
  46   @param  SystemTable   A pointer to the EFI System Table.
  47
  48   @retval EFI_SUCCESS   The constructor always returns EFI_SUCCESS.
  49
  50 **/
  51 EFI_STATUS
  52 EFIAPI
  53 DxeServicesTableLibConstructor (
  54   IN EFI_HANDLE        ImageHandle,
  55   IN EFI_SYSTEM_TABLE  *SystemTable
  56   )
  57 {
  58   EFI_STATUS  Status;
  59
  60   //
  61   // Cache copy of the DXE Services Table
  62   //
  63   Status = EfiGetSystemConfigurationTable (&gEfiDxeServicesTableGuid, (VOID **) &gDS);
  64   ASSERT_EFI_ERROR (Status);
  65   ASSERT (gDS != NULL);
  66
  67   return Status;
  68 }