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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
This commit is contained in:
qianouyang 2012-09-12 10:20:34 +00:00
parent 90398d5558
commit 504dfa9dbb
3 changed files with 72 additions and 25 deletions
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85
SecurityPkg/Tcg/MemoryOverwriteControl/TcgMor.c
View File

@ -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;
} 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;
}
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,
&MorControl
&mMorControl
);
ASSERT_EFI_ERROR (Status);
} else {
//
// Create a Ready To Boot Event and Clear the MorControl bit in the call back function.
//
DEBUG ((EFI_D_INFO, "TcgMor: Create ReadyToBoot Event for MorControl Bit cleanning!\n"));
Status = EfiCreateEventReadyToBootEx (
TPL_CALLBACK,
OnReadyToBoot,
NULL,
&Event
);
}
return Status;
}

3
SecurityPkg/Tcg/MemoryOverwriteControl/TcgMor.h
View File

@ -1,7 +1,7 @@
/** @file
The header file for TcgMor.
Copyright (c) 2009, 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
@ -22,6 +22,7 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
#include <Library/UefiDriverEntryPoint.h>
#include <Library/UefiRuntimeServicesTableLib.h>
#include <Library/DebugLib.h>
#include <Library/UefiLib.h>
#endif

3
SecurityPkg/Tcg/MemoryOverwriteControl/TcgMor.inf
View File

@ -1,7 +1,7 @@
## @file
# Component description file for Memory Overwrite Control driver.
#
# 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
@ -39,6 +39,7 @@
UefiRuntimeServicesTableLib
ReportStatusCodeLib
DebugLib
UefiLib
[Guids]
gEfiMemoryOverwriteControlDataGuid # GUID ALWAYS_CONSUMED