IntelFsp2Pkg: X64 compatible changes to support PEI in 64bit

[mirror_edk2.git] / IntelFsp2Pkg / Library / BaseFspSwitchStackLib / FspSwitchStackLib.c

/** @file\r
\r
  Copyright (c) 2014 - 2022, Intel Corporation. All rights reserved.<BR>\r
  SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
**/\r
\r
#include <Base.h>\r
#include <Library/BaseLib.h>\r
#include <Library/FspCommonLib.h>\r
\r
/**\r
\r
  Switch the current stack to the previous saved stack.\r
\r
  @param[in]  NewStack         The new stack to be switched.\r
\r
  @return OldStack         After switching to the saved stack,\r
                           this value will be saved in eax before returning.\r
\r
\r
**/\r
UINTN\r
EFIAPI\r
SwapStack (\r
  IN  UINTN  NewStack\r
  )\r
{\r
  FSP_GLOBAL_DATA  *FspData;\r
  UINTN            OldStack;\r
\r
  FspData            = GetFspGlobalDataPointer ();\r
  OldStack           = FspData->CoreStack;\r
  FspData->CoreStack = (UINTN) NewStack;\r
  return OldStack;\r
}\r