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| author | qianouyang <qianouyang@6f19259b-4bc3-4df7-8a09-765794883524> | 2012-09-12 10:20:34 +0000 |
|---|---|---|
| committer | qianouyang <qianouyang@6f19259b-4bc3-4df7-8a09-765794883524> | 2012-09-12 10:20:34 +0000 |
| commit | 504dfa9dbbbd8d485468aee58eb45cb295d9b031 (patch) | |
| tree | 595b5d803cd64a67dbf12237e6119e64bc23e945 /SecurityPkg/Tcg/MemoryOverwriteControl/TcgMor.c | |
| parent | 90398d5558431b733a97ba7e3a2fddcd5f0858f5 (diff) | |
| download | edk2-504dfa9dbbbd8d485468aee58eb45cb295d9b031.tar.gz edk2-504dfa9dbbbd8d485468aee58eb45cb295d9b031.tar.bz2 edk2-504dfa9dbbbd8d485468aee58eb45cb295d9b031.zip | |
Add Tper Reset Logic by using MOR bit.
Signed-off-by: Ouyang, Qian <Qian.Ouyang@intel.com>
Reviewed-by: Tian, Feng <feng.tian@intel.com>
Dong, Guo <Guo.dong@intel.com>
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13728 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'SecurityPkg/Tcg/MemoryOverwriteControl/TcgMor.c')
| -rw-r--r-- | SecurityPkg/Tcg/MemoryOverwriteControl/TcgMor.c | 91 |
1 files changed, 68 insertions, 23 deletions
diff --git a/SecurityPkg/Tcg/MemoryOverwriteControl/TcgMor.c b/SecurityPkg/Tcg/MemoryOverwriteControl/TcgMor.c index ce53112dc5..def965f138 100644 --- a/SecurityPkg/Tcg/MemoryOverwriteControl/TcgMor.c +++ b/SecurityPkg/Tcg/MemoryOverwriteControl/TcgMor.c @@ -4,7 +4,7 @@ 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>
+Copyright (c) 2009 - 2012, 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
@@ -17,6 +17,50 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. #include "TcgMor.h"
+UINT8 mMorControl;
+
+/**
+ Ready to Boot Event notification handler.
+
+ Sequence of OS boot events is measured in this event notification handler.
+
+ @param[in] Event Event whose notification function is being invoked
+ @param[in] Context Pointer to the notification function's context
+
+**/
+VOID
+EFIAPI
+OnReadyToBoot (
+ IN EFI_EVENT Event,
+ IN VOID *Context
+ )
+{
+ UINTN DataSize;
+
+ if (MOR_CLEAR_MEMORY_VALUE (mMorControl) == 0x0) {
+ //
+ // MorControl is expected, directly return to avoid unnecessary variable operation
+ //
+ return ;
+ }
+ //
+ // Clear MOR_CLEAR_MEMORY_BIT
+ //
+ DEBUG ((EFI_D_INFO, "TcgMor: Clear MorClearMemory bit\n"));
+ mMorControl &= 0xFE;
+
+ DataSize = sizeof (mMorControl);
+ gRT->SetVariable (
+ MEMORY_OVERWRITE_REQUEST_VARIABLE_NAME,
+ &gEfiMemoryOverwriteControlDataGuid,
+ EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,
+ DataSize,
+ &mMorControl
+ );
+
+}
+
+
/**
Entry Point for TCG MOR Control driver.
@@ -34,48 +78,49 @@ MorDriverEntryPoint ( )
{
EFI_STATUS Status;
- UINT8 MorControl;
UINTN DataSize;
+ EFI_EVENT Event;
///
/// The firmware is required to create the MemoryOverwriteRequestControl UEFI variable.
///
- DataSize = sizeof (MorControl);
+ DataSize = sizeof (mMorControl);
Status = gRT->GetVariable (
MEMORY_OVERWRITE_REQUEST_VARIABLE_NAME,
&gEfiMemoryOverwriteControlDataGuid,
NULL,
&DataSize,
- &MorControl
+ &mMorControl
);
if (EFI_ERROR (Status)) {
//
// Set default value to 0
//
- MorControl = 0;
+ mMorControl = 0;
+ DEBUG ((EFI_D_INFO, "TcgMor: Create gEfiMemoryOverwriteControlDataGuid!\n"));
+ Status = gRT->SetVariable (
+ MEMORY_OVERWRITE_REQUEST_VARIABLE_NAME,
+ &gEfiMemoryOverwriteControlDataGuid,
+ EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,
+ DataSize,
+ &mMorControl
+ );
+ ASSERT_EFI_ERROR (Status);
+
} 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
+ // Create a Ready To Boot Event and Clear the MorControl bit in the call back function.
//
- DEBUG ((EFI_D_INFO, "TcgMor: Clear MorClearMemory bit\n"));
- MorControl &= 0xFE;
- }
+ DEBUG ((EFI_D_INFO, "TcgMor: Create ReadyToBoot Event for MorControl Bit cleanning!\n"));
+ Status = EfiCreateEventReadyToBootEx (
+ TPL_CALLBACK,
+ OnReadyToBoot,
+ NULL,
+ &Event
+ );
+ }
- 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;
}
|