1 files changed, 65 insertions, 0 deletions
diff --git a/EmulatorPkg/Sec/Ia32/TempRam.c b/EmulatorPkg/Sec/Ia32/TempRam.c
new file mode 100644
index 0000000000..525fb95d48
--- /dev/null
+++ b/EmulatorPkg/Sec/Ia32/TempRam.c
@@ -0,0 +1,65 @@
+/*++ @file
+  Temp RAM PPI
+
+Copyright (c) 2011, Apple Inc. All rights reserved.<BR>
+This program and the accompanying materials
+are licensed and made available under the terms and conditions of the BSD License
+which accompanies this distribution.  The full text of the license may be found at
+http://opensource.org/licenses/bsd-license.php
+
+THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#include <PiPei.h>
+#include <Library/DebugLib.h>
+#include <Library/BaseMemoryLib.h>
+
+#include <Ppi/TemporaryRamSupport.h>
+
+VOID
+EFIAPI
+SecSwitchStack (
+  UINT32   TemporaryMemoryBase,
+  UINT32   PermenentMemoryBase
+  );
+
+
+EFI_STATUS
+EFIAPI
+SecTemporaryRamSupport (
+  IN CONST EFI_PEI_SERVICES   **PeiServices,
+  IN EFI_PHYSICAL_ADDRESS     TemporaryMemoryBase,
+  IN EFI_PHYSICAL_ADDRESS     PermanentMemoryBase,
+  IN UINTN                    CopySize
+  )
+{
+  //
+  // Migrate the whole temporary memory to permenent memory.
+  //
+  CopyMem (
+    (VOID*)(UINTN)PermanentMemoryBase,
+    (VOID*)(UINTN)TemporaryMemoryBase,
+    CopySize
+    );
+
+  //
+  // SecSwitchStack function must be invoked after the memory migration
+  // immediatly, also we need fixup the stack change caused by new call into
+  // permenent memory.
+  //
+  SecSwitchStack ((UINT32) TemporaryMemoryBase, (UINT32) PermanentMemoryBase);
+
+  //
+  // We need *not* fix the return address because currently,
+  // The PeiCore is excuted in flash.
+  //
+
+  //
+  // Simulate to invalid temporary memory, terminate temporary memory
+  //
+  //ZeroMem ((VOID*)(UINTN)TemporaryMemoryBase, CopySize);
+
+  return EFI_SUCCESS;
+}