IntelFsp2WrapperPkg/Library/BaseFspWrapperApiLib/IA32/DispatchExecute.c

   1 /** @file
   2   Execute 32-bit code in Protected Mode.
   3
   4   Copyright (c) 2014 - 2016, 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 <FspEas.h>
  17
  18 /**
  19   FSP API functions.
  20
  21   @param[in] Param1       The first parameter to pass to 32bit code.
  22   @param[in] Param2       The second parameter to pass to 32bit code.
  23
  24   @return EFI_STATUS.
  25 **/
  26 typedef
  27 EFI_STATUS
  28 (EFIAPI *FSP_FUNCTION) (
  29   IN VOID *Param1,
  30   IN VOID *Param2
  31   );
  32
  33 /**
  34   Wrapper for a thunk to transition from long mode to compatibility mode to execute 32-bit code and then transit back to
  35   long mode.
  36
  37   @param[in] Function     The 32bit code entry to be executed.
  38   @param[in] Param1       The first parameter to pass to 32bit code.
  39   @param[in] Param2       The second parameter to pass to 32bit code.
  40
  41   @return EFI_STATUS.
  42 **/
  43 EFI_STATUS
  44 Execute32BitCode (
  45   IN UINT64      Function,
  46   IN UINT64      Param1,
  47   IN UINT64      Param2
  48   )
  49 {
  50   FSP_FUNCTION               EntryFunc;
  51   EFI_STATUS                 Status;
  52
  53   EntryFunc = (FSP_FUNCTION) (UINTN) (Function);
  54   Status    = EntryFunc ((VOID *)(UINTN)Param1, (VOID *)(UINTN)Param2);
  55
  56   return Status;
  57 }
  58