TcgMorLock.c File Reference

#include <PiDxe.h>
#include <Guid/MemoryOverwriteControl.h>
#include <IndustryStandard/MemoryOverwriteRequestControlLock.h>
#include <Library/DebugLib.h>
#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include "TcgMorLock.h"

Go to the source code of this file.

Data Structures
struct	VARIABLE_TYPE

Functions
BOOLEAN	IsAnyMorVariable (IN CHAR16 *VariableName, IN EFI_GUID *VendorGuid)
BOOLEAN	IsMorLockVariable (IN CHAR16 *VariableName, IN EFI_GUID *VendorGuid)
EFI_STATUS EFIAPI	SetVariableCheckHandlerMor (IN CHAR16 *VariableName, IN EFI_GUID *VendorGuid, IN UINT32 Attributes, IN UINTN DataSize, IN VOID *Data)
EFI_STATUS EFIAPI	MorLockDriverInit (VOID)

Variables
VARIABLE_TYPE	mMorVariableType []

Detailed Description

TCG MOR (Memory Overwrite Request) Lock Control Driver.

This driver initializes MemoryOverwriteRequestControlLock variable. This module will add Variable Hook and allow MemoryOverwriteRequestControlLock variable set only once.

Copyright (c) 2015 - 2018, Intel Corporation. All rights reserved.
SPDX-License-Identifier: BSD-2-Clause-Patent

Definition in file TcgMorLock.c.

Function Documentation

IsAnyMorVariable()

BOOLEAN IsAnyMorVariable	(	IN CHAR16 *	VariableName,
		IN EFI_GUID *	VendorGuid
	)

Returns if this is MOR related variable.

Parameters

VariableName	the name of the vendor's variable, it's a Null-Terminated Unicode String
VendorGuid	Unify identifier for vendor.

Return values

TRUE	The variable is MOR related.
FALSE	The variable is NOT MOR related.

Definition at line 40 of file TcgMorLock.c.

IsMorLockVariable()

BOOLEAN IsMorLockVariable	(	IN CHAR16 *	VariableName,
		IN EFI_GUID *	VendorGuid
	)

Returns if this is MOR lock variable.

Parameters

VariableName	the name of the vendor's variable, it's a Null-Terminated Unicode String
VendorGuid	Unify identifier for vendor.

Return values

TRUE	The variable is MOR lock variable.
FALSE	The variable is NOT MOR lock variable.

Definition at line 68 of file TcgMorLock.c.

MorLockDriverInit()

EFI_STATUS EFIAPI MorLockDriverInit

(

VOID

)

Entry Point for MOR Lock Control driver.

Parameters

[in]	ImageHandle	Image handle of this driver.
[in]	SystemTable	A Pointer to the EFI System Table.

Return values

EFI_SUCCESS

Returns

Others Some error occurs.

Definition at line 180 of file TcgMorLock.c.

SetVariableCheckHandlerMor()

EFI_STATUS EFIAPI SetVariableCheckHandlerMor	(	IN CHAR16 *	VariableName,
		IN EFI_GUID *	VendorGuid,
		IN UINT32	Attributes,
		IN UINTN	DataSize,
		IN VOID *	Data
	)

This service is a checker handler for the UEFI Runtime Service SetVariable()

Parameters

VariableName	the name of the vendor's variable, as a Null-Terminated Unicode String
VendorGuid	Unify identifier for vendor.
Attributes	Point to memory location to return the attributes of variable. If the point is NULL, the parameter would be ignored.
DataSize	The size in bytes of Data-Buffer.
Data	Point to the content of the variable.

Return values

EFI_SUCCESS	The firmware has successfully stored the variable and its data as defined by the Attributes.
EFI_INVALID_PARAMETER	An invalid combination of attribute bits was supplied, or the DataSize exceeds the maximum allowed.
EFI_INVALID_PARAMETER	VariableName is an empty Unicode string.
EFI_OUT_OF_RESOURCES	Not enough storage is available to hold the variable and its data.
EFI_DEVICE_ERROR	The variable could not be saved due to a hardware failure.
EFI_WRITE_PROTECTED	The variable in question is read-only.
EFI_WRITE_PROTECTED	The variable in question cannot be deleted.
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.
EFI_NOT_FOUND	The variable trying to be updated or deleted was not found.

Definition at line 110 of file TcgMorLock.c.

Variable Documentation

mMorVariableType

VARIABLE_TYPE mMorVariableType[]

Initial value:

= {
  { MEMORY_OVERWRITE_REQUEST_VARIABLE_NAME,     &gEfiMemoryOverwriteControlDataGuid        },
  { MEMORY_OVERWRITE_REQUEST_CONTROL_LOCK_NAME, &gEfiMemoryOverwriteRequestControlLockGuid },
}

Definition at line 25 of file TcgMorLock.c.