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 - 2007, 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 PeiServices.
  22
  23   The function returns the pointer to PeiServices.
  24   It will ASSERT() if the pointer to PeiServices is NULL.
  25
  26   @retval  The pointer to PeiServices.
  27
  28 **/
  29 EFI_PEI_SERVICES **
  30 EFIAPI
  31 GetPeiServicesTablePointer (
  32   VOID
  33   )
  34 {
  35   EFI_PEI_SERVICES  **PeiServices;
  36
  37   PeiServices = (EFI_PEI_SERVICES **)(UINTN)AsmReadKr7 ();
  38   ASSERT (PeiServices != NULL);
  39   return PeiServices;
  40 }
  41
  42 /**
  43   The constructor function caches the pointer to PEI services.
  44
  45   The constructor function caches the pointer to PEI services.
  46   It will always return EFI_SUCCESS.
  47
  48   @param  FfsHeader   Pointer to FFS header the loaded driver.
  49   @param  PeiServices Pointer to the PEI services.
  50
  51   @retval EFI_SUCCESS   The constructor always returns EFI_SUCCESS.
  52
  53 **/
  54 EFI_STATUS
  55 EFIAPI
  56 PeiServicesTablePointerLibConstructor (
  57   IN EFI_PEI_FILE_HANDLE  *FfsHeader,
  58   IN EFI_PEI_SERVICES     **PeiServices
  59   )
  60 {
  61   AsmWriteKr7 ((UINT64)(UINTN)PeiServices);
  62   return EFI_SUCCESS;
  63 }
  64
  65 /**
  66   The function set the pointer of PEI services immediately preceding the IDT table
  67   according to PI specification.
  68
  69   @param    PeiServices   The address of PeiServices pointer.
  70 **/
  71 VOID
  72 EFIAPI
  73 SetPeiServicesTablePointer (
  74   EFI_PEI_SERVICES ** PeiServicesTablePointer
  75   )
  76 {
  77 }
  78
  79 /**
  80   After memory initialization in PEI phase, the IDT table in temporary memory should
  81   be migrated to memory, and the address of PeiServicesPointer also need to be updated
  82   immediately preceding the new IDT table.
  83
  84   @param    PeiServices   The address of PeiServices pointer.
  85 **/
  86 VOID
  87 MigrateIdtTable (
  88   IN EFI_PEI_SERVICES  **PeiServices
  89   )
  90 {
  91 }
  92
  93