/** @file | |
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.<BR> | |
SPDX-License-Identifier: BSD-2-Clause-Patent | |
**/ | |
#ifndef _MEMORY_OVERWRITE_CONTROL_DATA_GUID_H_ | |
#define _MEMORY_OVERWRITE_CONTROL_DATA_GUID_H_ | |
#define MEMORY_ONLY_RESET_CONTROL_GUID \ | |
{ \ | |
0xe20939be, 0x32d4, 0x41be, {0xa1, 0x50, 0x89, 0x7f, 0x85, 0xd4, 0x98, 0x29} \ | |
} | |
/// | |
/// 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 | |
/// | |
#define MEMORY_OVERWRITE_REQUEST_VARIABLE_NAME L"MemoryOverwriteRequestControl" | |
/// | |
/// 0 = Firmware MUST clear the MOR bit | |
/// 1 = Firmware MUST set the MOR bit | |
/// | |
#define MOR_CLEAR_MEMORY_BIT_MASK 0x01 | |
/// | |
/// 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. | |
/// | |
#define MOR_DISABLEAUTODETECT_BIT_MASK 0x10 | |
/// | |
/// MOR field bit offset | |
/// | |
#define MOR_CLEAR_MEMORY_BIT_OFFSET 0 | |
#define MOR_DISABLEAUTODETECT_BIT_OFFSET 4 | |
/** | |
Return the ClearMemory bit value 0 or 1. | |
@param mor 1 byte value that contains ClearMemory and DisableAutoDetect bit. | |
@return ClearMemory bit value | |
**/ | |
#define MOR_CLEAR_MEMORY_VALUE(mor) (((UINT8)(mor) & MOR_CLEAR_MEMORY_BIT_MASK) >> MOR_CLEAR_MEMORY_BIT_OFFSET) | |
/** | |
Return the DisableAutoDetect bit value 0 or 1. | |
@param mor 1 byte value that contains ClearMemory and DisableAutoDetect bit. | |
@return DisableAutoDetect bit value | |
**/ | |
#define MOR_DISABLE_AUTO_DETECT_VALUE(mor) (((UINT8)(mor) & MOR_DISABLEAUTODETECT_BIT_MASK) >> MOR_DISABLEAUTODETECT_BIT_OFFSET) | |
extern EFI_GUID gEfiMemoryOverwriteControlDataGuid; | |
#endif |