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 EFI_STATUS
  23 EFIAPI
  24 SecTemporaryRamSupport (
  25   IN CONST EFI_PEI_SERVICES  **PeiServices,
  26   IN EFI_PHYSICAL_ADDRESS    TemporaryMemoryBase,
  27   IN EFI_PHYSICAL_ADDRESS    PermanentMemoryBase,
  28   IN UINTN                   CopySize
  29   )
  30 {
  31   //
  32   // Migrate the whole temporary memory to permanent memory.
  33   //
  34   CopyMem (
  35     (VOID *)(UINTN)PermanentMemoryBase,
  36     (VOID *)(UINTN)TemporaryMemoryBase,
  37     CopySize
  38     );
  39
  40   //
  41   // SecSwitchStack function must be invoked after the memory migration
  42   // immediately, also we need fixup the stack change caused by new call into
  43   // permanent memory.
  44   //
  45   SecSwitchStack ((UINT32)TemporaryMemoryBase, (UINT32)PermanentMemoryBase);
  46
  47   //
  48   // We need *not* fix the return address because currently,
  49   // The PeiCore is executed in flash.
  50   //
  51
  52   //
  53   // Simulate to invalid temporary memory, terminate temporary memory
  54   //
  55   // ZeroMem ((VOID*)(UINTN)TemporaryMemoryBase, CopySize);
  56
  57   return EFI_SUCCESS;
  58 }