EdkModulePkg/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 #include <PeiMain.h>
  24 #include "IpfCpuCore.i"
  25
  26 extern
  27 SAL_RETURN_REGS
  28 GetHandOffStatus (
  29   VOID
  30   );
  31
  32 VOID
  33 SwitchToCacheMode (
  34   IN PEI_CORE_INSTANCE           *CoreData
  35   )
  36 /*++
  37
  38 Routine Description:
  39
  40  Switch the PHIT pointers to cache mode after InstallPeiMemory in CAR.
  41
  42 Arguments:
  43
  44   CoreData   - The PEI core Private Data
  45
  46 Returns:
  47
  48 --*/
  49 {
  50   EFI_HOB_HANDOFF_INFO_TABLE    *Phit;
  51
  52   if (CoreData == NULL) {
  53     //
  54     // the first call with CoreData as NULL.
  55     //
  56     return;
  57   }
  58
  59   if ((GetHandOffStatus().r10 & 0xFF) == RecoveryFn) {
  60     CoreData->StackBase = CoreData->StackBase &  CACHE_MODE_ADDRESS_MASK;
  61     CoreData->HobList.Raw = (UINT8 *)((UINTN)CoreData->HobList.Raw & CACHE_MODE_ADDRESS_MASK);
  62
  63     //
  64     // Change the PHIT pointer value to cache mode
  65     //
  66     Phit = CoreData->HobList.HandoffInformationTable;
  67
  68     Phit->EfiMemoryTop        = Phit->EfiMemoryTop & CACHE_MODE_ADDRESS_MASK;
  69     Phit->EfiFreeMemoryTop    = Phit->EfiFreeMemoryTop & CACHE_MODE_ADDRESS_MASK;
  70     Phit->EfiMemoryBottom     = Phit->EfiMemoryBottom  & CACHE_MODE_ADDRESS_MASK;
  71     Phit->EfiFreeMemoryBottom = Phit->EfiFreeMemoryBottom & CACHE_MODE_ADDRESS_MASK;
  72     Phit->EfiEndOfHobList     = Phit->EfiEndOfHobList & CACHE_MODE_ADDRESS_MASK;
  73   }
  74
  75   return;
  76 }