IntelFspWrapperPkg/Library/BaseFspApiLib/IA32/DispatchExecute.c

   1 /** @file
   2   Execute 32-bit code in Protected Mode.
   3
   4   Copyright (c) 2014 - 2015, Intel Corporation. All rights reserved.<BR>
   5   SPDX-License-Identifier: BSD-2-Clause-Patent
   6
   7 **/
   8
   9 #include <Uefi.h>
  10 #include <FspApi.h>
  11
  12 typedef
  13 EFI_STATUS
  14 (EFIAPI *FSP_FUNCTION) (
  15   IN VOID *Param1
  16   );
  17
  18 /**
  19   Wrapper for a thunk  to transition from long mode to compatibility mode to execute 32-bit code and then transit back to
  20   long mode.
  21
  22   @param[in] Function     The 32bit code entry to be executed.
  23   @param[in] Param1       The first parameter to pass to 32bit code.
  24
  25   @return EFI_STATUS.
  26 **/
  27 EFI_STATUS
  28 Execute32BitCode (
  29   IN UINT64      Function,
  30   IN UINT64      Param1
  31   )
  32 {
  33   FSP_FUNCTION               EntryFunc;
  34   EFI_STATUS                 Status;
  35
  36   EntryFunc = (FSP_FUNCTION) (UINTN) (Function);
  37   Status    = EntryFunc ((VOID *)(UINTN)Param1);
  38
  39   return Status;
  40 }
  41