/** @file | |
TCG2 SMM driver that updates TPM2 items in ACPI table and registers | |
SMI2 callback functions for Tcg2 physical presence, ClearMemory, and | |
sample for dTPM StartMethod. | |
Caution: This module requires additional review when modified. | |
This driver will have external input - variable and ACPINvs data in SMM mode. | |
This external input must be validated carefully to avoid security issue. | |
PhysicalPresenceCallback() and MemoryClearCallback() will receive untrusted input and do some check. | |
Copyright (c) 2015 - 2018, Intel Corporation. All rights reserved.<BR> | |
Copyright (c) Microsoft Corporation. | |
SPDX-License-Identifier: BSD-2-Clause-Patent | |
**/ | |
#include "Tcg2Smm.h" | |
#include <Library/UefiBootServicesTableLib.h> | |
#include <Library/SmmMemLib.h> | |
/** | |
Notify the system that the SMM variable driver is ready. | |
**/ | |
VOID | |
Tcg2NotifyMmReady ( | |
VOID | |
) | |
{ | |
EFI_STATUS Status; | |
EFI_HANDLE Handle; | |
Handle = NULL; | |
Status = gBS->InstallProtocolInterface ( | |
&Handle, | |
&gTcg2MmSwSmiRegisteredGuid, | |
EFI_NATIVE_INTERFACE, | |
NULL | |
); | |
ASSERT_EFI_ERROR (Status); | |
} | |
/** | |
This function is an abstraction layer for implementation specific Mm buffer validation routine. | |
@param Buffer The buffer start address to be checked. | |
@param Length The buffer length to be checked. | |
@retval TRUE This buffer is valid per processor architecture and not overlap with SMRAM. | |
@retval FALSE This buffer is not valid per processor architecture or overlap with SMRAM. | |
**/ | |
BOOLEAN | |
IsBufferOutsideMmValid ( | |
IN EFI_PHYSICAL_ADDRESS Buffer, | |
IN UINT64 Length | |
) | |
{ | |
return SmmIsBufferOutsideSmmValid (Buffer, Length); | |
} | |
/** | |
The driver's entry point. | |
It install callbacks for TPM physical presence and MemoryClear, and locate | |
SMM variable to be used in the callback function. | |
@param[in] ImageHandle The firmware allocated handle for the EFI image. | |
@param[in] SystemTable A pointer to the EFI System Table. | |
@retval EFI_SUCCESS The entry point is executed successfully. | |
@retval Others Some error occurs when executing this entry point. | |
**/ | |
EFI_STATUS | |
EFIAPI | |
InitializeTcgSmm ( | |
IN EFI_HANDLE ImageHandle, | |
IN EFI_SYSTEM_TABLE *SystemTable | |
) | |
{ | |
return InitializeTcgCommon (); | |
} |