diff options
Diffstat (limited to 'SecurityPkg/Tcg/MemoryOverwriteControl')
-rw-r--r-- | SecurityPkg/Tcg/MemoryOverwriteControl/TcgMor.c | 82 | ||||
-rw-r--r-- | SecurityPkg/Tcg/MemoryOverwriteControl/TcgMor.h | 27 | ||||
-rw-r--r-- | SecurityPkg/Tcg/MemoryOverwriteControl/TcgMor.inf | 50 |
3 files changed, 159 insertions, 0 deletions
diff --git a/SecurityPkg/Tcg/MemoryOverwriteControl/TcgMor.c b/SecurityPkg/Tcg/MemoryOverwriteControl/TcgMor.c new file mode 100644 index 0000000..ce53112 --- /dev/null +++ b/SecurityPkg/Tcg/MemoryOverwriteControl/TcgMor.c @@ -0,0 +1,82 @@ +/** @file
+ TCG MOR (Memory Overwrite Request) Control Driver.
+
+ This driver initilize MemoryOverwriteRequestControl variable. It
+ will clear MOR_CLEAR_MEMORY_BIT bit if it is set.
+
+Copyright (c) 2009 - 2011, 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.
+
+**/
+
+#include "TcgMor.h"
+
+/**
+ Entry Point for TCG MOR Control driver.
+
+ @param[in] ImageHandle Image handle of this driver.
+ @param[in] SystemTable A Pointer to the EFI System Table.
+
+ @retval EFI_SUCEESS
+ @return Others Some error occurs.
+**/
+EFI_STATUS
+EFIAPI
+MorDriverEntryPoint (
+ IN EFI_HANDLE ImageHandle,
+ IN EFI_SYSTEM_TABLE *SystemTable
+ )
+{
+ EFI_STATUS Status;
+ UINT8 MorControl;
+ UINTN DataSize;
+
+ ///
+ /// The firmware is required to create the MemoryOverwriteRequestControl UEFI variable.
+ ///
+
+ DataSize = sizeof (MorControl);
+ Status = gRT->GetVariable (
+ MEMORY_OVERWRITE_REQUEST_VARIABLE_NAME,
+ &gEfiMemoryOverwriteControlDataGuid,
+ NULL,
+ &DataSize,
+ &MorControl
+ );
+ if (EFI_ERROR (Status)) {
+ //
+ // Set default value to 0
+ //
+ MorControl = 0;
+ } else {
+ if (MOR_CLEAR_MEMORY_VALUE (MorControl) == 0x0) {
+ //
+ // MorControl is expected, directly return to avoid unnecessary variable operation
+ //
+ return EFI_SUCCESS;
+ }
+ //
+ // Clear MOR_CLEAR_MEMORY_BIT
+ //
+ DEBUG ((EFI_D_INFO, "TcgMor: Clear MorClearMemory bit\n"));
+ MorControl &= 0xFE;
+ }
+
+ Status = gRT->SetVariable (
+ MEMORY_OVERWRITE_REQUEST_VARIABLE_NAME,
+ &gEfiMemoryOverwriteControlDataGuid,
+ EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,
+ DataSize,
+ &MorControl
+ );
+ ASSERT_EFI_ERROR (Status);
+ return Status;
+}
+
+
diff --git a/SecurityPkg/Tcg/MemoryOverwriteControl/TcgMor.h b/SecurityPkg/Tcg/MemoryOverwriteControl/TcgMor.h new file mode 100644 index 0000000..bfad2cf --- /dev/null +++ b/SecurityPkg/Tcg/MemoryOverwriteControl/TcgMor.h @@ -0,0 +1,27 @@ +/** @file
+ The header file for TcgMor.
+
+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 __TCG_MOR_H__
+#define __TCG_MOR_H__
+
+#include <PiDxe.h>
+
+#include <Guid/MemoryOverwriteControl.h>
+
+#include <Library/UefiDriverEntryPoint.h>
+#include <Library/UefiRuntimeServicesTableLib.h>
+#include <Library/DebugLib.h>
+
+#endif
+
diff --git a/SecurityPkg/Tcg/MemoryOverwriteControl/TcgMor.inf b/SecurityPkg/Tcg/MemoryOverwriteControl/TcgMor.inf new file mode 100644 index 0000000..e62a904 --- /dev/null +++ b/SecurityPkg/Tcg/MemoryOverwriteControl/TcgMor.inf @@ -0,0 +1,50 @@ +## @file
+# Component description file for Memory Overwrite Control driver.
+#
+# Copyright (c) 2009 - 2011, 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.
+#
+##
+
+[Defines]
+ INF_VERSION = 0x00010005
+ BASE_NAME = TcgMor
+ FILE_GUID = AD416CE3-A483-45b1-94C2-4B4E4D575562
+ MODULE_TYPE = DXE_DRIVER
+ VERSION_STRING = 1.0
+
+ ENTRY_POINT = MorDriverEntryPoint
+
+#
+# The following information is for reference only and not required by the build tools.
+#
+# VALID_ARCHITECTURES = IA32 X64 IPF EBC
+#
+
+[Sources]
+ TcgMor.c
+ TcgMor.h
+
+[Packages]
+ MdePkg/MdePkg.dec
+ SecurityPkg/SecurityPkg.dec
+
+[LibraryClasses]
+ UefiDriverEntryPoint
+ UefiRuntimeServicesTableLib
+ ReportStatusCodeLib
+ DebugLib
+
+[Guids]
+ gEfiMemoryOverwriteControlDataGuid # GUID ALWAYS_CONSUMED
+
+[Depex]
+ gEfiVariableArchProtocolGuid AND
+ gEfiVariableWriteArchProtocolGuid AND
+ gEfiTcgProtocolGuid
+
|