MdePkg/Library/PeiServicesTablePointerLib/PeiServicesTablePointer.c

   1 /** @file
   2   PEI Services Table Pointer Library.
   3
   4   This library is used for PEIM which does executed from flash device directly but
   5   executed in memory.
   6
   7   Copyright (c) 2006 - 2008, Intel Corporation<BR>
   8   All rights reserved. This program and the accompanying materials
   9   are licensed and made available under the terms and conditions of the BSD License
  10   which accompanies this distribution.  The full text of the license may be found at
  11   http://opensource.org/licenses/bsd-license.php
  12
  13   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  14   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  15
  16 **/
  17
  18 #include <PiPei.h>
  19 #include <Library/PeiServicesTablePointerLib.h>
  20 #include <Library/DebugLib.h>
  21
  22 CONST EFI_PEI_SERVICES  **gPeiServices;
  23
  24 /**
  25   The function set the pointer of PEI services immediately preceding the IDT table
  26   according to PI specification.
  27
  28   @param    PeiServicesTablePointer   The address of PeiServices pointer.
  29 **/
  30 VOID
  31 EFIAPI
  32 SetPeiServicesTablePointer (
  33   IN CONST EFI_PEI_SERVICES ** PeiServicesTablePointer
  34   )
  35 {
  36   gPeiServices = PeiServicesTablePointer;
  37 }
  38
  39 /**
  40   The function returns the pointer to PEI services.
  41
  42   The function returns the pointer to PEI services.
  43   It will ASSERT() if the pointer to PEI services is NULL.
  44
  45   @retval  The pointer to PeiServices.
  46
  47 **/
  48 CONST EFI_PEI_SERVICES **
  49 EFIAPI
  50 GetPeiServicesTablePointer (
  51   VOID
  52   )
  53 {
  54   ASSERT (gPeiServices != NULL);
  55   return gPeiServices;
  56 }
  57
  58
  59 /**
  60   The constructor function caches the pointer to PEI services.
  61
  62   The constructor function caches the pointer to PEI services.
  63   It will always return EFI_SUCCESS.
  64
  65   @param  FileHandle   Handle of FFS header the loaded driver.
  66   @param  PeiServices Pointer to the PEI services.
  67
  68   @retval EFI_SUCCESS   The constructor always returns EFI_SUCCESS.
  69
  70 **/
  71 EFI_STATUS
  72 EFIAPI
  73 PeiServicesTablePointerLibConstructor (
  74   IN EFI_PEI_FILE_HANDLE        FileHandle,
  75   IN CONST EFI_PEI_SERVICES     **PeiServices
  76   )
  77 {
  78   gPeiServices = PeiServices;
  79   return EFI_SUCCESS;
  80 }
  81
  82