EdkCompatibilityPkg/Compatibility/DxeSmmReadyToLockOnExitPmAuthThunk/DxeSmmReadyToLockOnExitPmAuthThunk.c

/** @file
  DxeSmmReadyToLock Protocol on ExitPmAuth Protocol Thunk driver.
  EDK platform uses ExitPmAuth point to lock SMRAM and SMM API.
  But EDKII uses DxeSmmReadyToLock. We need a thunk driver to convert this event.

Copyright (c) 2010 - 2011, Intel Corporation. All rights reserved.<BR>

This program and the accompanying materials
are licensed and made available under the terms and conditions
of the BSD License which accompanies this distribution.  The
full text of the license may be found at
http://opensource.org/licenses/bsd-license.php

THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

**/

#include  "DxeSmmReadyToLockOnExitPmAuthThunk.h"

/**
  ExitPmAuth Protocol notification event handler.

  @param[in] Event    Event whose notification function is being invoked.
  @param[in] Context  Pointer to the notification function's context.
**/
VOID
EFIAPI
ExitPmAuthProtocolNotification (
  IN EFI_EVENT  Event,
  IN VOID       *Context
  )
{
  EFI_STATUS Status;
  EFI_HANDLE ImageHandle;
  VOID       *ExitPmAuth;

  //
  // Add more check to locate protocol after got event, because
  // ECP will signal this event immediately once it is register
  // just in case it is already installed.
  //
  Status = gBS->LocateProtocol (
                  &gExitPmAuthProtocolGuid,
                  NULL,
                  &ExitPmAuth
                  );
  if (EFI_ERROR (Status)) {
    return ;
  }

  //
  // Install DxeSmmReadyToLock protocol to let PI SMM lock
  //
  ImageHandle = NULL;
  Status = gBS->InstallProtocolInterface (
                  &ImageHandle,
                  &gEfiDxeSmmReadyToLockProtocolGuid,
                  EFI_NATIVE_INTERFACE,
                  NULL
                  );
  ASSERT_EFI_ERROR (Status);
}

/**
  Entry Point for DxeSmmReadyToLock Protocol on ExitPmAuth Protocol Thunk driver.

  @param[in] ImageHandle  Image handle of this driver.
  @param[in] SystemTable  A Pointer to the EFI System Table.

  @retval EFI_SUCCESS  The entry point is executed successfully.
**/
EFI_STATUS
EFIAPI
DxeSmmReadyToLockMain (
  IN EFI_HANDLE        ImageHandle,
  IN EFI_SYSTEM_TABLE  *SystemTable
  )
{
  VOID *Registration;

  //
  // Install notifications for required protocols
  //
  EfiCreateProtocolNotifyEvent (
    &gExitPmAuthProtocolGuid,
    TPL_CALLBACK,
    ExitPmAuthProtocolNotification,
    NULL,
    &Registration
    );

  return EFI_SUCCESS;
}