1 files changed, 36 insertions, 0 deletions
diff --git a/roms/edk2/IntelFsp2Pkg/Library/BaseFspSwitchStackLib/FspSwitchStackLib.c b/roms/edk2/IntelFsp2Pkg/Library/BaseFspSwitchStackLib/FspSwitchStackLib.c
new file mode 100644
index 000000000..fd553db62
--- /dev/null
+++ b/roms/edk2/IntelFsp2Pkg/Library/BaseFspSwitchStackLib/FspSwitchStackLib.c
@@ -0,0 +1,36 @@
+/** @file
+
+  Copyright (c) 2014, Intel Corporation. All rights reserved.<BR>
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <Base.h>
+#include <Library/BaseLib.h>
+#include <Library/FspCommonLib.h>
+
+/**
+
+  Switch the current stack to the previous saved stack.
+
+  @param[in]  NewStack         The new stack to be switched.
+
+  @return OldStack         After switching to the saved stack,
+                           this value will be saved in eax before returning.
+
+
+**/
+UINT32
+SwapStack (
+  IN  UINT32 NewStack
+  )
+{
+  FSP_GLOBAL_DATA  *FspData;
+  UINT32         OldStack;
+
+  FspData  = GetFspGlobalDataPointer ();
+  OldStack = FspData->CoreStack;
+  FspData->CoreStack = NewStack;
+  return OldStack;
+}
+