IntelFspWrapperPkg/Library/BaseFspApiLib/IA32/DispatchExecute.c

   1 /** @file
   2   Execute 32-bit code in Protected Mode.
   3
   4   Copyright (c) 2014, Intel Corporation. All rights reserved.<BR>
   5   This program and the accompanying materials
   6   are licensed and made available under the terms and conditions of the BSD License
   7   which accompanies this distribution.  The full text of the license may be found at
   8   http://opensource.org/licenses/bsd-license.php.
   9
  10   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13 **/
  14
  15 #include <Uefi.h>
  16 #include <FspApi.h>
  17
  18 typedef
  19 FSP_STATUS
  20 (FSPAPI *FSP_FUNCTION) (
  21   IN VOID *Param1
  22   );
  23
  24 /**
  25   Wrapper for a thunk  to transition from long mode to compatibility mode to execute 32-bit code and then transit back to
  26   long mode.
  27
  28   @param[in] Function     The 32bit code entry to be executed.
  29   @param[in] Param1       The first parameter to pass to 32bit code.
  30
  31   @return FSP_STATUS.
  32 **/
  33 FSP_STATUS
  34 Execute32BitCode (
  35   IN UINT64      Function,
  36   IN UINT64      Param1
  37   )
  38 {
  39   FSP_FUNCTION               EntryFunc;
  40   FSP_STATUS                 Status;
  41
  42   EntryFunc = (FSP_FUNCTION) (UINTN) (Function);
  43   Status    = EntryFunc ((VOID *)(UINTN)Param1);
  44
  45   return Status;
  46 }
  47