/** @file | |
TCG MOR (Memory Overwrite Request) Lock Control Driver SMM wrapper. | |
Copyright (c) 2015 - 2018, Intel Corporation. All rights reserved.<BR> | |
SPDX-License-Identifier: BSD-2-Clause-Patent | |
**/ | |
#include <PiSmm.h> | |
#include <Library/SmmServicesTableLib.h> | |
#include <Library/DebugLib.h> | |
#include <Protocol/SmmVarCheck.h> | |
#include <Protocol/SmmVariable.h> | |
#include "TcgMorLock.h" | |
EFI_SMM_VARIABLE_PROTOCOL *mSmmVariable; | |
/** | |
This service is a wrapper for the UEFI Runtime Service GetVariable(). | |
@param VariableName the name of the vendor's variable, it's a Null-Terminated Unicode String | |
@param VendorGuid Unify identifier for vendor. | |
@param Attributes Point to memory location to return the attributes of variable. If the point | |
is NULL, the parameter would be ignored. | |
@param DataSize As input, point to the maximum size of return Data-Buffer. | |
As output, point to the actual size of the returned Data-Buffer. | |
@param Data Point to return Data-Buffer. | |
@retval EFI_SUCCESS The function completed successfully. | |
@retval EFI_NOT_FOUND The variable was not found. | |
@retval EFI_BUFFER_TOO_SMALL The DataSize is too small for the result. DataSize has | |
been updated with the size needed to complete the request. | |
@retval EFI_INVALID_PARAMETER VariableName is NULL. | |
@retval EFI_INVALID_PARAMETER VendorGuid is NULL. | |
@retval EFI_INVALID_PARAMETER DataSize is NULL. | |
@retval EFI_INVALID_PARAMETER The DataSize is not too small and Data is NULL. | |
@retval EFI_DEVICE_ERROR The variable could not be retrieved due to a hardware error. | |
@retval EFI_SECURITY_VIOLATION The variable could not be retrieved due to an authentication failure. | |
**/ | |
EFI_STATUS | |
EFIAPI | |
InternalGetVariable ( | |
IN CHAR16 *VariableName, | |
IN EFI_GUID *VendorGuid, | |
OUT UINT32 *Attributes OPTIONAL, | |
IN OUT UINTN *DataSize, | |
OUT VOID *Data | |
) | |
{ | |
return mSmmVariable->SmmGetVariable ( | |
VariableName, | |
VendorGuid, | |
Attributes, | |
DataSize, | |
Data | |
); | |
} | |
/** | |
This service is a wrapper for the UEFI Runtime Service SetVariable() | |
@param VariableName the name of the vendor's variable, as a | |
Null-Terminated Unicode String | |
@param VendorGuid Unify identifier for vendor. | |
@param Attributes Point to memory location to return the attributes of variable. If the point | |
is NULL, the parameter would be ignored. | |
@param DataSize The size in bytes of Data-Buffer. | |
@param Data Point to the content of the variable. | |
@retval EFI_SUCCESS The firmware has successfully stored the variable and its data as | |
defined by the Attributes. | |
@retval EFI_INVALID_PARAMETER An invalid combination of attribute bits was supplied, or the | |
DataSize exceeds the maximum allowed. | |
@retval EFI_INVALID_PARAMETER VariableName is an empty Unicode string. | |
@retval EFI_OUT_OF_RESOURCES Not enough storage is available to hold the variable and its data. | |
@retval EFI_DEVICE_ERROR The variable could not be saved due to a hardware failure. | |
@retval EFI_WRITE_PROTECTED The variable in question is read-only. | |
@retval EFI_WRITE_PROTECTED The variable in question cannot be deleted. | |
@retval EFI_SECURITY_VIOLATION The variable could not be written due to EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS | |
set but the AuthInfo does NOT pass the validation check carried | |
out by the firmware. | |
@retval EFI_NOT_FOUND The variable trying to be updated or deleted was not found. | |
**/ | |
EFI_STATUS | |
EFIAPI | |
InternalSetVariable ( | |
IN CHAR16 *VariableName, | |
IN EFI_GUID *VendorGuid, | |
IN UINT32 Attributes, | |
IN UINTN DataSize, | |
IN VOID *Data | |
) | |
{ | |
return mSmmVariable->SmmSetVariable ( | |
VariableName, | |
VendorGuid, | |
Attributes, | |
DataSize, | |
Data | |
); | |
} | |
/** | |
Entry Point for MOR Lock Control driver. | |
@param[in] ImageHandle The firmware allocated handle for the EFI image. | |
@param[in] SystemTable A pointer to the EFI System Table. | |
@retval EFI_SUCCESS EntryPoint runs successfully. | |
**/ | |
EFI_STATUS | |
EFIAPI | |
MorLockDriverEntryPointSmm ( | |
IN EFI_HANDLE ImageHandle, | |
IN EFI_SYSTEM_TABLE *SystemTable | |
) | |
{ | |
EFI_STATUS Status; | |
EDKII_SMM_VAR_CHECK_PROTOCOL *SmmVarCheck; | |
// | |
// This driver link to Smm Variable driver | |
// | |
DEBUG ((DEBUG_INFO, "MorLockDriverEntryPointSmm\n")); | |
Status = gSmst->SmmLocateProtocol ( | |
&gEfiSmmVariableProtocolGuid, | |
NULL, | |
(VOID **)&mSmmVariable | |
); | |
ASSERT_EFI_ERROR (Status); | |
Status = gSmst->SmmLocateProtocol ( | |
&gEdkiiSmmVarCheckProtocolGuid, | |
NULL, | |
(VOID **)&SmmVarCheck | |
); | |
ASSERT_EFI_ERROR (Status); | |
Status = MorLockDriverInit (); | |
if (EFI_ERROR (Status)) { | |
return Status; | |
} | |
Status = SmmVarCheck->SmmRegisterSetVariableCheckHandler (SetVariableCheckHandlerMor); | |
ASSERT_EFI_ERROR (Status); | |
return Status; | |
} |