MdeModulePkg/Core/Pei/Ipf/SwitchToCacheMode.c

   1 /*++
   2
   3 Copyright (c) 2006, Intel Corporation
   4 All rights reserved. This program and the accompanying materials
   5 are licensed and made available under the terms and conditions of the BSD License
   6 which accompanies this distribution.  The full text of the license may be found at
   7 http://opensource.org/licenses/bsd-license.php
   8
   9 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  10 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  11
  12 Module Name:
  13
  14   SwitchToCacheMode.c
  15
  16 Abstract:
  17
  18   Ipf CAR specific function used to switch to cache mode for the later memory access
  19
  20 Revision History
  21
  22 --*/
  23
  24 #include "IpfPeiMain.h"
  25
  26 VOID
  27 SwitchToCacheMode (
  28   IN PEI_CORE_INSTANCE           *CoreData
  29   )
  30 /*++
  31
  32 Routine Description:
  33
  34  Switch the PHIT pointers to cache mode after InstallPeiMemory in CAR.
  35
  36 Arguments:
  37
  38   CoreData   - The PEI core Private Data
  39
  40 Returns:
  41
  42 --*/
  43 {
  44   EFI_HOB_HANDOFF_INFO_TABLE    *Phit;
  45
  46   if (CoreData == NULL) {
  47     //
  48     // the first call with CoreData as NULL.
  49     //
  50     return;
  51   }
  52
  53   if ((GetHandOffStatus().r10 & 0xFF) == RecoveryFn) {
  54     CoreData->StackBase = CoreData->StackBase &  CACHE_MODE_ADDRESS_MASK;
  55     CoreData->HobList.Raw = (UINT8 *)((UINTN)CoreData->HobList.Raw & CACHE_MODE_ADDRESS_MASK);
  56
  57     //
  58     // Change the PHIT pointer value to cache mode
  59     //
  60     Phit = CoreData->HobList.HandoffInformationTable;
  61
  62     Phit->EfiMemoryTop        = Phit->EfiMemoryTop & CACHE_MODE_ADDRESS_MASK;
  63     Phit->EfiFreeMemoryTop    = Phit->EfiFreeMemoryTop & CACHE_MODE_ADDRESS_MASK;
  64     Phit->EfiMemoryBottom     = Phit->EfiMemoryBottom  & CACHE_MODE_ADDRESS_MASK;
  65     Phit->EfiFreeMemoryBottom = Phit->EfiFreeMemoryBottom & CACHE_MODE_ADDRESS_MASK;
  66     Phit->EfiEndOfHobList     = Phit->EfiEndOfHobList & CACHE_MODE_ADDRESS_MASK;
  67   }
  68
  69   return;
  70 }