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 #define  RecoveryFn                             0x03
  26
  27 VOID
  28 SwitchToCacheMode (
  29   IN PEI_CORE_INSTANCE           *CoreData
  30   )
  31 /*++
  32
  33 Routine Description:
  34
  35  Switch the PHIT pointers to cache mode after InstallPeiMemory in CAR.
  36
  37 Arguments:
  38
  39   CoreData   - The PEI core Private Data
  40
  41 Returns:
  42
  43 --*/
  44 {
  45   EFI_HOB_HANDOFF_INFO_TABLE    *Phit;
  46
  47   if ((GetHandOffStatus().r10 & 0xFF) == RecoveryFn) {
  48     CoreData->StackBase = CoreData->StackBase &  CACHE_MODE_ADDRESS_MASK;
  49     CoreData->HobList.Raw = (UINT8 *)((UINTN)CoreData->HobList.Raw & CACHE_MODE_ADDRESS_MASK);
  50
  51     //
  52     // Change the PHIT pointer value to cache mode
  53     //
  54     Phit = CoreData->HobList.HandoffInformationTable;
  55
  56     Phit->EfiMemoryTop        = Phit->EfiMemoryTop & CACHE_MODE_ADDRESS_MASK;
  57     Phit->EfiFreeMemoryTop    = Phit->EfiFreeMemoryTop & CACHE_MODE_ADDRESS_MASK;
  58     Phit->EfiMemoryBottom     = Phit->EfiMemoryBottom  & CACHE_MODE_ADDRESS_MASK;
  59     Phit->EfiFreeMemoryBottom = Phit->EfiFreeMemoryBottom & CACHE_MODE_ADDRESS_MASK;
  60     Phit->EfiEndOfHobList     = Phit->EfiEndOfHobList & CACHE_MODE_ADDRESS_MASK;
  61   }
  62
  63   return;
  64 }