EdkCompatibilityPkg/Compatibility/BootScriptSaveOnS3SaveStateThunk/IA32/DispatchExecute.c

   1 /** @file
   2   Execute 32-bit code in Long Mode
   3   Provide a thunk function to transition from long mode to compatibility mode to execute 32-bit code and then transit
   4   back to long mode.
   5
   6   Copyright (c) 2010, Intel Corporation. All rights reserved.<BR>
   7   This program and the accompanying materials
   8   are licensed and made available under the terms and conditions of the BSD License
   9   which accompanies this distribution.  The full text of the license may be found at
  10   http://opensource.org/licenses/bsd-license.php
  11
  12   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  13   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  14
  15 **/
  16 #include "ScriptSave.h"
  17 /**
  18   Wrapper for a thunk  to transition from long mode to compatibility mode to execute 32-bit code and then transit back to
  19   long mode.
  20
  21   @param  Function     The 32bit code entry to be executed.
  22   @param  Param1       The first parameter to pass to 32bit code
  23   @param  Param2       The second parameter to pass to 32bit code
  24   @retval EFI_SUCCESS  Execute 32bit code successfully.
  25   @retval other        Something wrong when execute the 32bit code
  26
  27 **/
  28 EFI_STATUS
  29 Execute32BitCode (
  30   IN UINT64      Function,
  31   IN UINT64      Param1,
  32   IN UINT64      Param2
  33   )
  34 {
  35   DISPATCH_ENTRYPOINT_FUNC  EntryFunc;
  36   EFI_STATUS                 Status;
  37
  38   EntryFunc = (DISPATCH_ENTRYPOINT_FUNC) (UINTN) (Function);
  39   Status    = EntryFunc ((VOID *)(UINTN)Param1, (VOID *)(UINTN)Param2);
  40
  41   return Status;
  42 }
  43