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/** @file -- VariablePolicyExtraInitRuntimeDxe.c
This file contains extra init and deinit routines that register and unregister
VariableAddressChange callbacks.
Copyright (c) Microsoft Corporation.
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <Library/UefiBootServicesTableLib.h>
#include <Library/UefiRuntimeServicesTableLib.h>
extern EFI_GET_VARIABLE mGetVariableHelper;
extern UINT8 *mPolicyTable;
STATIC BOOLEAN mIsVirtualAddrConverted;
STATIC EFI_EVENT mVariablePolicyLibVirtualAddressChangeEvent = NULL;
/**
For the RuntimeDxe version of this lib, convert internal pointer addresses to virtual addresses.
@param[in] Event Event whose notification function is being invoked.
@param[in] Context The pointer to the notification function's context, which
is implementation-dependent.
**/
STATIC
VOID
EFIAPI
VariablePolicyLibVirtualAddressCallback (
IN EFI_EVENT Event,
IN VOID *Context
)
{
gRT->ConvertPointer (0, (VOID **)&mPolicyTable);
gRT->ConvertPointer (0, (VOID **)&mGetVariableHelper);
mIsVirtualAddrConverted = TRUE;
}
/**
An extra init hook that enables the RuntimeDxe library instance to
register VirtualAddress change callbacks. Among other things.
@retval EFI_SUCCESS Everything is good. Continue with init.
@retval Others Uh... don't continue.
**/
EFI_STATUS
VariablePolicyExtraInit (
VOID
)
{
return gBS->CreateEventEx (
EVT_NOTIFY_SIGNAL,
TPL_NOTIFY,
VariablePolicyLibVirtualAddressCallback,
NULL,
&gEfiEventVirtualAddressChangeGuid,
&mVariablePolicyLibVirtualAddressChangeEvent
);
}
/**
An extra deinit hook that enables the RuntimeDxe library instance to
register VirtualAddress change callbacks. Among other things.
@retval EFI_SUCCESS Everything is good. Continue with deinit.
@retval Others Uh... don't continue.
**/
EFI_STATUS
VariablePolicyExtraDeinit (
VOID
)
{
EFI_STATUS Status;
Status = EFI_SUCCESS;
if (mIsVirtualAddrConverted) {
Status = gBS->CloseEvent (mVariablePolicyLibVirtualAddressChangeEvent);
} else {
Status = EFI_SUCCESS;
}
return Status;
}
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