MdePkg/Library/PeiServicesTablePointerLibKr7/PeiServicesTablePointer.c

   1 /** @file
   2   PEI Services Table Pointer Library implementation for IPF that uses Kernel
   3   Register 7 to store the pointer.
   4
   5   Copyright (c) 2006 - 2008, Intel Corporation.<BR>
   6   All rights reserved. This program and the accompanying materials
   7   are licensed and made available under the terms and conditions of the BSD License
   8   which accompanies this distribution.  The full text of the license may be found at
   9   http://opensource.org/licenses/bsd-license.php
  10
  11   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  12   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  13
  14 **/
  15
  16 #include <PiPei.h>
  17 #include <Library/BaseLib.h>
  18 #include <Library/DebugLib.h>
  19
  20 /**
  21   The function returns the pointer to PEI services.
  22
  23   The function returns the pointer to PEI services.
  24   It will ASSERT() if the pointer to PEI services is NULL.
  25
  26   @return  The pointer to PeiServices.
  27
  28 **/
  29 CONST EFI_PEI_SERVICES **
  30 EFIAPI
  31 GetPeiServicesTablePointer (
  32   VOID
  33   )
  34 {
  35   CONST EFI_PEI_SERVICES  **PeiServices;
  36
  37   PeiServices = (CONST EFI_PEI_SERVICES **)(UINTN)AsmReadKr7 ();
  38   ASSERT (PeiServices != NULL);
  39   return PeiServices;
  40 }
  41
  42 /**
  43   The function set the pointer of PEI services in KR7 register
  44   according to PI specification.
  45
  46   @param    PeiServicesTablePointer   The address of PeiServices pointer.
  47 **/
  48 VOID
  49 EFIAPI
  50 SetPeiServicesTablePointer (
  51   IN CONST EFI_PEI_SERVICES ** PeiServicesTablePointer
  52   )
  53 {
  54   AsmWriteKr7 ((UINT64)(UINTN)PeiServicesTablePointer);
  55 }
  56
  57
  58
  59