MdePkg/Library/PeiServicesTablePointerLibKr1/PeiServicesTablePointer.c

   1 /*++
   2
   3 Copyright (c) 2006 Intel Corporation. All rights reserved
   4 This software and associated documentation (if any) is furnished
   5 under a license and may only be used or copied in accordance
   6 with the terms of the license. Except as permitted by such
   7 license, no part of this software or documentation may be
   8 reproduced, stored in a retrieval system, or transmitted in any
   9 form or by any means without the express written consent of
  10 Intel Corporation.
  11
  12
  13 Module Name:
  14
  15   PeiServicesTablePointer.c
  16
  17 Abstract:
  18
  19   PEI Services Table Pointer Library.
  20
  21 --*/
  22
  23 #include "PeiServicesTablePointerLibInternals.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)AsmReadKr1 ();
  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   AsmWriteKr1 ((UINT64)(UINTN)PeiServices);
  67   return EFI_SUCCESS;
  68 }