EmulatorPkg/Sec/Ia32/TempRam.c

   1 /*++ @file
   2   Temp RAM PPI
   3
   4 Copyright (c) 2011, Apple Inc. All rights reserved.<BR>
   5 SPDX-License-Identifier: BSD-2-Clause-Patent
   6
   7 **/
   8
   9 #include <PiPei.h>
  10 #include <Library/DebugLib.h>
  11 #include <Library/BaseMemoryLib.h>
  12
  13 #include <Ppi/TemporaryRamSupport.h>
  14
  15 VOID
  16 EFIAPI
  17 SecSwitchStack (
  18   UINT32   TemporaryMemoryBase,
  19   UINT32   PermenentMemoryBase
  20   );
  21
  22
  23 EFI_STATUS
  24 EFIAPI
  25 SecTemporaryRamSupport (
  26   IN CONST EFI_PEI_SERVICES   **PeiServices,
  27   IN EFI_PHYSICAL_ADDRESS     TemporaryMemoryBase,
  28   IN EFI_PHYSICAL_ADDRESS     PermanentMemoryBase,
  29   IN UINTN                    CopySize
  30   )
  31 {
  32   //
  33   // Migrate the whole temporary memory to permanent memory.
  34   //
  35   CopyMem (
  36     (VOID*)(UINTN)PermanentMemoryBase,
  37     (VOID*)(UINTN)TemporaryMemoryBase,
  38     CopySize
  39     );
  40
  41   //
  42   // SecSwitchStack function must be invoked after the memory migration
  43   // immediately, also we need fixup the stack change caused by new call into
  44   // permanent memory.
  45   //
  46   SecSwitchStack ((UINT32) TemporaryMemoryBase, (UINT32) PermanentMemoryBase);
  47
  48   //
  49   // We need *not* fix the return address because currently,
  50   // The PeiCore is executed in flash.
  51   //
  52
  53   //
  54   // Simulate to invalid temporary memory, terminate temporary memory
  55   //
  56   //ZeroMem ((VOID*)(UINTN)TemporaryMemoryBase, CopySize);
  57
  58   return EFI_SUCCESS;
  59 }