TcgMor.c revision 4fd606d1f5abe38e1f42c38de1d2e895166bd0f4
/** @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
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.
**/
)
{
///
/// The firmware is required to create the MemoryOverwriteRequestControl UEFI variable.
///
DataSize = sizeof (MorControl);
NULL,
&DataSize,
);
//
// Set default value to 0
//
MorControl = 0;
} else {
//
// MorControl is expected, directly return to avoid unnecessary variable operation
//
return EFI_SUCCESS;
}
//
// Clear MOR_CLEAR_MEMORY_BIT
//
MorControl &= 0xFE;
}
);
return Status;
}