/** @file | |
Parts of the SMM/MM implementation that are specific to traditional MM | |
Copyright (c) 2011 - 2018, Intel Corporation. All rights reserved. <BR> | |
Copyright (c) 2018, Linaro, Ltd. All rights reserved. <BR> | |
SPDX-License-Identifier: BSD-2-Clause-Patent | |
**/ | |
#include <Library/UefiBootServicesTableLib.h> | |
#include <Library/SmmMemLib.h> | |
#include "Variable.h" | |
/** | |
This function checks if the buffer is valid per processor architecture and | |
does not overlap with SMRAM. | |
@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 does not | |
overlap with SMRAM. | |
@retval FALSE This buffer is not valid per processor architecture or overlaps | |
with SMRAM. | |
**/ | |
BOOLEAN | |
VariableSmmIsBufferOutsideSmmValid ( | |
IN EFI_PHYSICAL_ADDRESS Buffer, | |
IN UINT64 Length | |
) | |
{ | |
return SmmIsBufferOutsideSmmValid (Buffer, Length); | |
} | |
/** | |
Notify the system that the SMM variable driver is ready. | |
**/ | |
VOID | |
VariableNotifySmmReady ( | |
VOID | |
) | |
{ | |
EFI_STATUS Status; | |
EFI_HANDLE Handle; | |
Handle = NULL; | |
Status = gBS->InstallProtocolInterface ( | |
&Handle, | |
&gEfiSmmVariableProtocolGuid, | |
EFI_NATIVE_INTERFACE, | |
NULL | |
); | |
ASSERT_EFI_ERROR (Status); | |
} | |
/** | |
Notify the system that the SMM variable write driver is ready. | |
**/ | |
VOID | |
VariableNotifySmmWriteReady ( | |
VOID | |
) | |
{ | |
EFI_STATUS Status; | |
EFI_HANDLE Handle; | |
Handle = NULL; | |
Status = gBS->InstallProtocolInterface ( | |
&Handle, | |
&gSmmVariableWriteGuid, | |
EFI_NATIVE_INTERFACE, | |
NULL | |
); | |
ASSERT_EFI_ERROR (Status); | |
} | |
/** | |
Variable service MM driver entry point | |
@param[in] ImageHandle A handle for the image that is initializing this | |
driver | |
@param[in] SystemTable A pointer to the EFI system table | |
@retval EFI_SUCCESS Variable service successfully initialized. | |
**/ | |
EFI_STATUS | |
EFIAPI | |
VariableServiceInitialize ( | |
IN EFI_HANDLE ImageHandle, | |
IN EFI_SYSTEM_TABLE *SystemTable | |
) | |
{ | |
return MmVariableServiceInitialize (); | |
} | |
/** | |
Whether the TCG or TCG2 protocols are installed in the UEFI protocol database. | |
This information is used by the MorLock code to infer whether an existing | |
MOR variable is legitimate or not. | |
@retval TRUE Either the TCG or TCG2 protocol is installed in the UEFI | |
protocol database | |
@retval FALSE Neither the TCG nor the TCG2 protocol is installed in the UEFI | |
protocol database | |
**/ | |
BOOLEAN | |
VariableHaveTcgProtocols ( | |
VOID | |
) | |
{ | |
EFI_STATUS Status; | |
VOID *Interface; | |
Status = gBS->LocateProtocol ( | |
&gEfiTcg2ProtocolGuid, | |
NULL, // Registration | |
&Interface | |
); | |
if (!EFI_ERROR (Status)) { | |
return TRUE; | |
} | |
Status = gBS->LocateProtocol ( | |
&gEfiTcgProtocolGuid, | |
NULL, // Registration | |
&Interface | |
); | |
return !EFI_ERROR (Status); | |
} |