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| author | gdong1 <gdong1@6f19259b-4bc3-4df7-8a09-765794883524> | 2011-09-02 07:49:32 +0000 |
|---|---|---|
| committer | gdong1 <gdong1@6f19259b-4bc3-4df7-8a09-765794883524> | 2011-09-02 07:49:32 +0000 |
| commit | 0c18794ea4289f03fefc7117b56740414cc0536c (patch) | |
| tree | 4e51c5cc23c69a67cead8c58464da870daa4c029 /SecurityPkg/Tcg/MemoryOverwriteControl/TcgMor.c | |
| parent | 986d1dfb0813d6a7623531e85c2e2a7e1f956cf8 (diff) | |
| download | edk2-0c18794ea4289f03fefc7117b56740414cc0536c.tar.gz edk2-0c18794ea4289f03fefc7117b56740414cc0536c.tar.bz2 edk2-0c18794ea4289f03fefc7117b56740414cc0536c.zip | |
Add security package to repository.
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12261 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'SecurityPkg/Tcg/MemoryOverwriteControl/TcgMor.c')
| -rw-r--r-- | SecurityPkg/Tcg/MemoryOverwriteControl/TcgMor.c | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/SecurityPkg/Tcg/MemoryOverwriteControl/TcgMor.c b/SecurityPkg/Tcg/MemoryOverwriteControl/TcgMor.c new file mode 100644 index 0000000000..ce53112dc5 --- /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;
+}
+
+
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