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-rw-r--r--Core/IntelFsp2Pkg/Library/BaseFspSwitchStackLib/FspSwitchStackLib.c42
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diff --git a/Core/IntelFsp2Pkg/Library/BaseFspSwitchStackLib/FspSwitchStackLib.c b/Core/IntelFsp2Pkg/Library/BaseFspSwitchStackLib/FspSwitchStackLib.c
new file mode 100644
index 0000000000..42a57a27c0
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+++ b/Core/IntelFsp2Pkg/Library/BaseFspSwitchStackLib/FspSwitchStackLib.c
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+/** @file
+
+ Copyright (c) 2014, Intel Corporation. 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 <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;
+}
+