MdePkg/Library/PeiServicesTablePointerLibMm7/PeiServicesTablePointer.c

   1 /** @file
   2   PEI Services Table Pointer 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:  PeiServicesTablePointer.c
  14
  15 **/
  16
  17
  18 #include <PiPei.h>
  19
  20
  21 #include <Library/PeiServicesTablePointerLib.h>
  22 #include <Library/BaseLib.h>
  23 #include <Library/DebugLib.h>
  24
  25 /**
  26   The function returns the pointer to PeiServices.
  27
  28   The function returns the pointer to PeiServices.
  29   It will ASSERT() if the pointer to PeiServices is NULL.
  30
  31   @retval  The pointer to PeiServices.
  32
  33 **/
  34 EFI_PEI_SERVICES **
  35 EFIAPI
  36 GetPeiServicesTablePointer (
  37   VOID
  38   )
  39 {
  40   EFI_PEI_SERVICES  **PeiServices;
  41
  42   PeiServices = (EFI_PEI_SERVICES **)(UINTN)AsmReadMm7 ();
  43   ASSERT (PeiServices != NULL);
  44   return PeiServices;
  45 }
  46
  47 /**
  48   The constructor function caches the pointer to PEI services.
  49
  50   The constructor function caches the pointer to PEI services.
  51   It will always return EFI_SUCCESS.
  52
  53   @param  FfsHeader   Pointer to FFS header the loaded driver.
  54   @param  PeiServices Pointer to the PEI services.
  55
  56   @retval EFI_SUCCESS   The constructor always returns EFI_SUCCESS.
  57
  58 **/
  59 EFI_STATUS
  60 EFIAPI
  61 PeiServicesTablePointerLibConstructor (
  62   IN EFI_FFS_FILE_HEADER  *FfsHeader,
  63   IN EFI_PEI_SERVICES     **PeiServices
  64   )
  65 {
  66   AsmWriteMm7 ((UINT64)(UINTN)PeiServices);
  67   return EFI_SUCCESS;
  68 }