ArmPlatformPkg/Library/PeiServicesTablePointerLib/PeiServicesTablePointer.c

   1 /** @file
   2   PEI Services Table Pointer Library.
   3
   4   This library is used for PEIM which does executed from flash device directly but
   5   executed in memory.
   6
   7   Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
   8   This program and the accompanying materials
   9   are licensed and made available under the terms and conditions of the BSD License
  10   which accompanies this distribution.  The full text of the license may be found at
  11   http://opensource.org/licenses/bsd-license.php.
  12
  13   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  14   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  15
  16 **/
  17
  18 #include <PiPei.h>
  19 #include <Library/PeiServicesTablePointerLib.h>
  20 #include <Library/DebugLib.h>
  21 #include <Library/PcdLib.h>
  22
  23 /**
  24   Caches a pointer PEI Services Table.
  25
  26   Caches the pointer to the PEI Services Table specified by PeiServicesTablePointer
  27   in a platform specific manner.
  28
  29   If PeiServicesTablePointer is NULL, then ASSERT().
  30
  31   @param    PeiServicesTablePointer   The address of PeiServices pointer.
  32 **/
  33 VOID
  34 EFIAPI
  35 SetPeiServicesTablePointer (
  36   IN CONST EFI_PEI_SERVICES ** PeiServicesTablePointer
  37   )
  38 {
  39   UINTN *PeiPtrLoc;
  40   ASSERT (PeiServicesTablePointer != NULL);
  41
  42   PeiPtrLoc = (UINTN *)(UINTN)(PcdGet32 (PcdCPUCoresNonSecStackBase) +
  43                                (PcdGet32 (PcdCPUCoresNonSecStackSize) / 2) -
  44                                PcdGet32 (PcdPeiGlobalVariableSize) +
  45                                PcdGet32 (PcdPeiServicePtrGlobalOffset));
  46   *PeiPtrLoc = (UINTN)PeiServicesTablePointer;
  47 }
  48
  49 /**
  50   Retrieves the cached value of the PEI Services Table pointer.
  51
  52   Returns the cached value of the PEI Services Table pointer in a CPU specific manner
  53   as specified in the CPU binding section of the Platform Initialization Pre-EFI
  54   Initialization Core Interface Specification.
  55
  56   If the cached PEI Services Table pointer is NULL, then ASSERT().
  57
  58   @return  The pointer to PeiServices.
  59
  60 **/
  61 CONST EFI_PEI_SERVICES **
  62 EFIAPI
  63 GetPeiServicesTablePointer (
  64   VOID
  65   )
  66 {
  67   UINTN *PeiPtrLoc;
  68
  69   PeiPtrLoc = (UINTN *)(UINTN)(PcdGet32 (PcdCPUCoresNonSecStackBase) +
  70                                (PcdGet32 (PcdCPUCoresNonSecStackSize) / 2) -
  71                                PcdGet32 (PcdPeiGlobalVariableSize) +
  72                                PcdGet32 (PcdPeiServicePtrGlobalOffset));
  73   return (CONST EFI_PEI_SERVICES **)*PeiPtrLoc;
  74 }
  75
  76