/** @file | |
Boot Script Helper SMM driver. | |
This driver is responsible to store BootScriptThunk from ReservedMemory to SMRAM for security consideration. | |
Copyright (c) 2010 - 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 | |
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 <PiDxe.h> | |
#include <Library/BaseLib.h> | |
#include <Library/PcdLib.h> | |
#include <Library/DebugLib.h> | |
#include <Library/LockBoxLib.h> | |
#include <Guid/BootScriptThunkData.h> | |
EFI_GUID mBootScriptThunkGuid = { | |
0xa053f561, 0xf56b, 0x4140, {0x89, 0x1, 0xb4, 0xcb, 0x5d, 0x70, 0x92, 0x9e} | |
}; | |
/** | |
Entry point function of the Boot Script Thunk Helper SMM driver. | |
@param[in] ImageHandle The firmware allocated handle for the EFI image. | |
@param[in] SystemTable A pointer to the EFI System Table. | |
@retval EFI_SUCCESS The entry point is executed successfully. | |
@retval other Some error occurs when executing this entry point. | |
**/ | |
EFI_STATUS | |
EFIAPI | |
BootScriptThunkHelperMain ( | |
IN EFI_HANDLE ImageHandle, | |
IN EFI_SYSTEM_TABLE *SystemTable | |
) | |
{ | |
BOOT_SCRIPT_THUNK_DATA *BootScriptThunkData; | |
EFI_STATUS Status; | |
// | |
// Get BootScriptThunk variable | |
// | |
BootScriptThunkData = (BOOT_SCRIPT_THUNK_DATA *)(UINTN)PcdGet64(BootScriptThunkDataPtr); | |
ASSERT (BootScriptThunkData != NULL); | |
if (BootScriptThunkData == NULL) { | |
return EFI_NOT_FOUND; | |
} | |
// | |
// Save BootScriptThunk image | |
// | |
Status = SaveLockBox ( | |
&mBootScriptThunkGuid, | |
(VOID *)(UINTN)BootScriptThunkData->BootScriptThunkBase, | |
(UINTN)BootScriptThunkData->BootScriptThunkLength | |
); | |
ASSERT_EFI_ERROR (Status); | |
Status = SetLockBoxAttributes (&mBootScriptThunkGuid, LOCK_BOX_ATTRIBUTE_RESTORE_IN_PLACE); | |
ASSERT_EFI_ERROR (Status); | |
return Status; | |
} |