1 files changed, 55 insertions, 0 deletions
diff --git a/src/vendorcode/intel/edk2/edk2-stable202005/IntelFsp2Pkg/Include/Library/FspSwitchStackLib.h b/src/vendorcode/intel/edk2/edk2-stable202005/IntelFsp2Pkg/Include/Library/FspSwitchStackLib.h
new file mode 100644
index 0000000000..259a57606a
--- /dev/null
+++ b/src/vendorcode/intel/edk2/edk2-stable202005/IntelFsp2Pkg/Include/Library/FspSwitchStackLib.h
@@ -0,0 +1,55 @@
+/** @file
+
+  Copyright (c) 2014 - 2020, Intel Corporation. All rights reserved.<BR>
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef _FSP_SWITCH_STACK_LIB_H_
+#define _FSP_SWITCH_STACK_LIB_H_
+
+/**
+
+  This function will switch the current stack to the previous saved stack.
+  Before calling the previous stack has to be set in  FSP_GLOBAL_DATA.CoreStack.
+                    EIP
+                    FLAGS  16 bit  FLAGS  16 bit
+                    EDI
+                    ESI
+                    EBP
+                    ESP
+                    EBX
+                    EDX
+                    ECX
+                    EAX
+                    DWORD     IDT base1
+  StackPointer:     DWORD     IDT base2
+
+  @return ReturnKey          After switching to the saved stack,
+                             this value will be saved in eax before returning.
+
+
+**/
+UINT32
+EFIAPI
+Pei2LoaderSwitchStack (
+  VOID
+  );
+
+/**
+
+  This function is equivalent to Pei2LoaderSwitchStack () but just indicates
+  the stack after switched is FSP stack.
+
+  @return ReturnKey          After switching to the saved stack,
+                             this value will be saved in eax before returning.
+
+
+**/
+UINT32
+EFIAPI
+Loader2PeiSwitchStack (
+  VOID
+  );
+
+#endif