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/** @file
Library utility functions for Runtime driver.
Copyright (c) 2006 Intel Corporation. <BR>
All rights reserved. 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 <RuntimeLibInternal.h>
///
/// Driver Lib Module Globals
///
STATIC EFI_EVENT mEfiVirtualNotifyEvent;
STATIC EFI_EVENT mEfiExitBootServicesEvent;
STATIC BOOLEAN mEfiGoneVirtual = FALSE;
STATIC BOOLEAN mEfiAtRuntime = FALSE;
EFI_RUNTIME_SERVICES *mRT;
/**
Set AtRuntime flag as TRUE after ExitBootServices.
@param[in] Event The Event that is being processed
@param[in] Context Event Context
**/
VOID
EFIAPI
RuntimeLibExitBootServicesEvent (
IN EFI_EVENT Event,
IN VOID *Context
)
{
//
// Clear out BootService globals
//
gBS = NULL;
mEfiAtRuntime = TRUE;
}
/**
Fixup internal data so that EFI can be call in virtual mode.
Call the passed in Child Notify event and convert any pointers in
lib to virtual mode.
@param[in] Event The Event that is being processed
@param[in] Context Event Context
**/
VOID
EFIAPI
RuntimeLibVirtualNotifyEvent (
IN EFI_EVENT Event,
IN VOID *Context
)
{
//
// Update global for Runtime Services Table and IO
//
EfiConvertPointer (0, (VOID **) &mRT);
mEfiGoneVirtual = TRUE;
}
/**
Intialize runtime Driver Lib if it has not yet been initialized.
@param[in] ImageHandle The firmware allocated handle for the EFI image.
@param[in] SystemTable A pointer to the EFI System Table.
@return EFI_STATUS always returns EFI_SUCCESS except EFI_ALREADY_STARTED if already started.
**/
EFI_STATUS
EFIAPI
RuntimeDriverLibConstruct (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
EFI_STATUS Status;
mRT = gRT;
ASSERT (mRT != NULL);
//
// Register SetVirtualAddressMap () notify function
//
ASSERT (gBS != NULL);
Status = gBS->CreateEvent (
EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE,
TPL_NOTIFY,
RuntimeLibVirtualNotifyEvent,
NULL,
&mEfiVirtualNotifyEvent
);
ASSERT_EFI_ERROR (Status);
Status = gBS->CreateEvent (
EVT_SIGNAL_EXIT_BOOT_SERVICES,
TPL_NOTIFY,
RuntimeLibExitBootServicesEvent,
NULL,
&mEfiExitBootServicesEvent
);
ASSERT_EFI_ERROR (Status);
return Status;
}
/**
This routine will free some resources which have been allocated in
EfiInitializeRuntimeDriverLib(). If a runtime driver exits with an error,
it must call this routine to free the allocated resource before the exiting.
@param[in] ImageHandle The firmware allocated handle for the EFI image.
@param[in] SystemTable A pointer to the EFI System Table.
@retval EFI_SUCCESS Shutdown the Runtime Driver Lib successfully
@retval EFI_UNSUPPORTED Runtime Driver lib was not initialized at all
**/
EFI_STATUS
EFIAPI
RuntimeDriverLibDeconstruct (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
EFI_STATUS Status;
//
// Close SetVirtualAddressMap () notify function
//
ASSERT (gBS != NULL);
Status = gBS->CloseEvent (mEfiVirtualNotifyEvent);
ASSERT_EFI_ERROR (Status);
Status = gBS->CloseEvent (mEfiExitBootServicesEvent);
ASSERT_EFI_ERROR (Status);
return Status;
}
/**
Return TRUE if ExitBootServices () has been called.
@retval TRUE If ExitBootServices () has been called
**/
BOOLEAN
EFIAPI
EfiAtRuntime (
VOID
)
{
return mEfiAtRuntime;
}
/**
Return TRUE if SetVirtualAddressMap () has been called.
@retval TRUE If SetVirtualAddressMap () has been called
**/
BOOLEAN
EFIAPI
EfiGoneVirtual (
VOID
)
{
return mEfiGoneVirtual;
}
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