| /** @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 |