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. All rights reserved.<BR>
   8   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   Caches a pointer PEI Services Table.
  26
  27   Caches the pointer to the PEI Services Table specified by PeiServicesTablePointer
  28   in a CPU specific manner as specified in the CPU binding section of the Platform Initialization
  29   Pre-EFI Initialization Core Interface Specification.
  30
  31   If PeiServicesTablePointer is NULL, then ASSERT().
  32
  33   @param    PeiServicesTablePointer   The address of PeiServices pointer.
  34 **/
  35 VOID
  36 EFIAPI
  37 SetPeiServicesTablePointer (
  38   IN CONST EFI_PEI_SERVICES ** PeiServicesTablePointer
  39   )
  40 {
  41   ASSERT (PeiServicesTablePointer != NULL);
  42   gPeiServices = PeiServicesTablePointer;
  43 }
  44
  45 /**
  46   Retrieves the cached value of the PEI Services Table pointer.
  47
  48   Returns the cached value of the PEI Services Table pointer in a CPU specific manner
  49   as specified in the CPU binding section of the Platform Initialization Pre-EFI
  50   Initialization Core Interface Specification.
  51
  52   If the cached PEI Services Table pointer is NULL, then ASSERT().
  53
  54   @return  The pointer to PeiServices.
  55
  56 **/
  57 CONST EFI_PEI_SERVICES **
  58 EFIAPI
  59 GetPeiServicesTablePointer (
  60   VOID
  61   )
  62 {
  63   ASSERT (gPeiServices != NULL);
  64   return gPeiServices;
  65 }
  66
  67
  68 /**
  69   The constructor function caches the pointer to PEI services.
  70
  71   The constructor function caches the pointer to PEI services.
  72   It will always return EFI_SUCCESS.
  73
  74   @param  FileHandle   Handle of FFS header the loaded driver.
  75   @param  PeiServices Pointer to the PEI services.
  76
  77   @retval EFI_SUCCESS   The constructor always returns EFI_SUCCESS.
  78
  79 **/
  80 EFI_STATUS
  81 EFIAPI
  82 PeiServicesTablePointerLibConstructor (
  83   IN EFI_PEI_FILE_HANDLE        FileHandle,
  84   IN CONST EFI_PEI_SERVICES     **PeiServices
  85   )
  86 {
  87   gPeiServices = PeiServices;
  88   return EFI_SUCCESS;
  89 }
  90
  91