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Diffstat (limited to 'src/vendorcode/intel/edk2/UDK2017/MdePkg/Include/Guid/MemoryOverwriteControl.h')
-rw-r--r-- | src/vendorcode/intel/edk2/UDK2017/MdePkg/Include/Guid/MemoryOverwriteControl.h | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/src/vendorcode/intel/edk2/UDK2017/MdePkg/Include/Guid/MemoryOverwriteControl.h b/src/vendorcode/intel/edk2/UDK2017/MdePkg/Include/Guid/MemoryOverwriteControl.h new file mode 100644 index 0000000000..35f6343d37 --- /dev/null +++ b/src/vendorcode/intel/edk2/UDK2017/MdePkg/Include/Guid/MemoryOverwriteControl.h @@ -0,0 +1,76 @@ +/** @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, Intel Corporation. All rights reserved.<BR> + 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. + +**/ + +#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 |