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 /**
  19   The function returns the pointer to PeiServices.
  20
  21   The function returns the pointer to PeiServices.
  22   It will ASSERT() if the pointer to PeiServices is NULL.
  23
  24   @retval  The pointer to PeiServices.
  25
  26 **/
  27 EFI_PEI_SERVICES **
  28 EFIAPI
  29 GetPeiServicesTablePointer (
  30   VOID
  31   )
  32 {
  33   EFI_PEI_SERVICES  **PeiServices;
  34
  35   PeiServices = (EFI_PEI_SERVICES **)(UINTN)AsmReadMm7 ();
  36   ASSERT (PeiServices != NULL);
  37   return PeiServices;
  38 }
  39
  40 /**
  41   The constructor function caches the pointer to PEI services.
  42
  43   The constructor function caches the pointer to PEI services.
  44   It will always return EFI_SUCCESS.
  45
  46   @param  FfsHeader   Pointer to FFS header the loaded driver.
  47   @param  PeiServices Pointer to the PEI services.
  48
  49   @retval EFI_SUCCESS   The constructor always returns EFI_SUCCESS.
  50
  51 **/
  52 EFI_STATUS
  53 EFIAPI
  54 PeiServicesTablePointerLibConstructor (
  55   IN EFI_FFS_FILE_HEADER  *FfsHeader,
  56   IN EFI_PEI_SERVICES     **PeiServices
  57   )
  58 {
  59   AsmWriteMm7 ((UINT64)(UINTN)PeiServices);
  60   return EFI_SUCCESS;
  61 }