> On Mar 31, 2015, at 8:44 PM, Zeng, Star <star.z...@intel.com> wrote:
>
> i Andrew,
>
> After SmmReadyToLock, only SMM driver is allowed to write boot script. In DXE
> SCRIPT_TABLE_PRIVATE_DATA instance, only the TableBase field will be used for
> BootScriptExecute at S3 resume, other fields will be not used.
> So the TableLength field in DXE SCRIPT_TABLE_PRIVATE_DATA instance could be
> set to 0 after SmmReadyToLock to say it will be not synced, or even the
> whole DXE SCRIPT_TABLE_PRIVATE_DATA instance could be emptied as the
> TableBase field has been saved into lockbox and will be restored at S3 resume.
>
I’m still confused on how it works? The 1st driver to run (DXE or SMM)
registers S3BootScriptEventCallBack() on gEfiDxeSmmReadyToLockProtocolGuid
event. If !mS3BootScriptTablePtr->AtRuntime then the LockBox is updated. In my
case this instance of the mS3BootScriptTablePtr had the incorrect length (too
short).
The SMM drivers all register S3BootScriptSmmEventCallBack() on the
gEfiSmmReadyToLockProtocolGuid event and this also calls
S3BootScriptEventCallBack (NULL, NULL).
It still seems like the LockBox is updated as part of the boot process (calling
the library APIs). S3BootScriptGetEntryAddAddress() calls
S3BootScriptGetBootTimeEntryAddAddress() and the DXE driver version of
SCRIPT_TABLE_PRIVATE_DATA. It seems if an SMM driver wrote a script entry,
prior to the event callback, things could get out os sync? Can you only call
the Library in SMM from locking events?
Thanks,
Andrew Fish
> Thanks,
> Star
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