SecurityPkg/Tcg/MemoryOverwriteControl/TcgMor.c File Reference


Functions

VOID EFIAPI OnReadyToBoot (IN EFI_EVENT Event, IN VOID *Context)
VOID InitiateTPerReset (IN EFI_STORAGE_SECURITY_COMMAND_PROTOCOL *Ssp, IN UINT32 MediaId)
VOID EFIAPI TPerResetAtEndOfDxe (IN EFI_EVENT Event, IN VOID *Context)
EFI_STATUS EFIAPI MorDriverEntryPoint (IN EFI_HANDLE ImageHandle, IN EFI_SYSTEM_TABLE *SystemTable)

Variables

UINT8 mMorControl

Detailed Description

TCG MOR (Memory Overwrite Request) Control Driver.

This driver initilize MemoryOverwriteRequestControl variable. It will clear MOR_CLEAR_MEMORY_BIT bit if it is set. It will also do TPer Reset for those encrypted drives through EFI_STORAGE_SECURITY_COMMAND_PROTOCOL at EndOfDxe.

Copyright (c) 2009 - 2015, Intel Corporation. All rights reserved.
This program and the accompanying materials are licensed and made available under the terms and conditions of the BSD License which accompanies this distribution. The full text of the license may be found at http://opensource.org/licenses/bsd-license.php

THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.


Function Documentation

VOID InitiateTPerReset ( IN EFI_STORAGE_SECURITY_COMMAND_PROTOCOL *  Ssp,
IN UINT32  MediaId 
)

Send TPer Reset command to reset eDrive to lock all protected bands. Typically, there are 2 mechanism for resetting eDrive. They are: 1. TPer Reset through IEEE 1667 protocol. 2. TPer Reset through native TCG protocol. This routine will detect what protocol the attached eDrive comform to, TCG or IEEE 1667 protocol. Then send out TPer Reset command separately.

Parameters:
[in] Ssp The pointer to EFI_STORAGE_SECURITY_COMMAND_PROTOCOL instance.
[in] MediaId ID of the medium to receive data from or send data to.

References BOOLEAN(), EFI_STATUS(), ROUNDUP512, SECURITY_PROTOCOL_IEEE1667, SECURITY_PROTOCOL_TCG, SUPPORTED_SECURITY_PROTOCOLS_PARAMETER_DATA::SupportedSecurityListLength, SUPPORTED_SECURITY_PROTOCOLS_PARAMETER_DATA::SupportedSecurityProtocol, TRUE, and UINTN().

Referenced by TPerResetAtEndOfDxe().

EFI_STATUS EFIAPI MorDriverEntryPoint ( IN EFI_HANDLE  ImageHandle,
IN EFI_SYSTEM_TABLE *  SystemTable 
)

Entry Point for TCG MOR Control driver.

Parameters:
[in] ImageHandle Image handle of this driver.
[in] SystemTable A Pointer to the EFI System Table.
Return values:
EFI_SUCEESS 
Returns:
Others Some error occurs.

The firmware is required to create the MemoryOverwriteRequestControl UEFI variable.

References EFI_STATUS(), mMorControl, OnReadyToBoot(), TPerResetAtEndOfDxe(), and UINTN().

VOID EFIAPI OnReadyToBoot ( IN EFI_EVENT  Event,
IN VOID *  Context 
)

Ready to Boot Event notification handler.

Sequence of OS boot events is measured in this event notification handler.

Parameters:
[in] Event Event whose notification function is being invoked
[in] Context Pointer to the notification function's context

References EFI_STATUS(), mMorControl, and UINTN().

VOID EFIAPI TPerResetAtEndOfDxe ( IN EFI_EVENT  Event,
IN VOID *  Context 
)

Notification function of END_OF_DXE.

This is a notification function registered on END_OF_DXE event. It is to get VarCheckPcdBin.

Parameters:
[in] Event Event whose notification function is being invoked.
[in] Context Pointer to the notification function's context.

References EFI_STATUS(), InitiateTPerReset(), and UINTN().

Referenced by MorDriverEntryPoint().


Variable Documentation

UINT8 mMorControl


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