Macros
#define	MEMORY_ONLY_RESET_CONTROL_GUID

#define	MEMORY_OVERWRITE_REQUEST_VARIABLE_NAME L"MemoryOverwriteRequestControl"

#define	MOR_CLEAR_MEMORY_BIT_MASK 0x01

#define	MOR_DISABLEAUTODETECT_BIT_MASK 0x10

#define	MOR_CLEAR_MEMORY_BIT_OFFSET 0

#define	MOR_DISABLEAUTODETECT_BIT_OFFSET 4

#define	MOR_CLEAR_MEMORY_VALUE(mor) (((UINT8)(mor) & MOR_CLEAR_MEMORY_BIT_MASK) >> MOR_CLEAR_MEMORY_BIT_OFFSET)

#define	MOR_DISABLE_AUTO_DETECT_VALUE(mor) (((UINT8)(mor) & MOR_DISABLEAUTODETECT_BIT_MASK) >> MOR_DISABLEAUTODETECT_BIT_OFFSET)

Variables
EFI_GUID	gEfiMemoryOverwriteControlDataGuid

Detailed Description

GUID used for MemoryOverwriteRequestControl UEFI variable defined in TCG Platform Reset Attack Mitigation Specification 1.00. See http://trustedcomputinggroup.org for the latest specification

The purpose of the MemoryOverwriteRequestControl UEFI variable is to give users (e.g., OS, loader) the ability to indicate to the platform that secrets are present in memory and that the platform firmware must clear memory upon a restart. The OS loader should not create the variable. Rather, the firmware is required to create it.

Copyright (c) 2009 - 2018, 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.

Macro Definition Documentation

◆ MEMORY_ONLY_RESET_CONTROL_GUID

#define MEMORY_ONLY_RESET_CONTROL_GUID

Value:

  { \
    0xe20939be, 0x32d4, 0x41be, {0xa1, 0x50, 0x89, 0x7f, 0x85, 0xd4, 0x98, 0x29} \
  }

◆ MEMORY_OVERWRITE_REQUEST_VARIABLE_NAME

#define MEMORY_OVERWRITE_REQUEST_VARIABLE_NAME L"MemoryOverwriteRequestControl"

Variable name is "MemoryOverwriteRequestControl" and it is a 1 byte unsigned value. The attributes should be: EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS

◆ MOR_CLEAR_MEMORY_BIT_MASK

#define MOR_CLEAR_MEMORY_BIT_MASK 0x01

0 = Firmware MUST clear the MOR bit 1 = Firmware MUST set the MOR bit

◆ MOR_CLEAR_MEMORY_BIT_OFFSET

#define MOR_CLEAR_MEMORY_BIT_OFFSET 0

MOR field bit offset

◆ MOR_CLEAR_MEMORY_VALUE

#define MOR_CLEAR_MEMORY_VALUE ( mor ) (((UINT8)(mor) & MOR_CLEAR_MEMORY_BIT_MASK) >> MOR_CLEAR_MEMORY_BIT_OFFSET)

Return the ClearMemory bit value 0 or 1.

Parameters

mor	1 byte value that contains ClearMemory and DisableAutoDetect bit.

Returns: ClearMemory bit value

◆ MOR_DISABLE_AUTO_DETECT_VALUE

#define MOR_DISABLE_AUTO_DETECT_VALUE ( mor ) (((UINT8)(mor) & MOR_DISABLEAUTODETECT_BIT_MASK) >> MOR_DISABLEAUTODETECT_BIT_OFFSET)

Return the DisableAutoDetect bit value 0 or 1.

Parameters

mor	1 byte value that contains ClearMemory and DisableAutoDetect bit.

Returns: DisableAutoDetect bit value

◆ MOR_DISABLEAUTODETECT_BIT_MASK

#define MOR_DISABLEAUTODETECT_BIT_MASK 0x10

0 = Firmware MAY autodetect a clean shutdown of the Static RTM OS. 1 = Firmware MUST NOT autodetect a clean shutdown of the Static RTM OS.

◆ MOR_DISABLEAUTODETECT_BIT_OFFSET

#define MOR_DISABLEAUTODETECT_BIT_OFFSET 4

Variable Documentation

◆ gEfiMemoryOverwriteControlDataGuid

EFI_GUID gEfiMemoryOverwriteControlDataGuid

extern

Macros

Variables