Mars:
PeiMain uses PpiData->NotifyListEnd and DispatchListEnd index to
differentiate NotifyPpi with CallBack and Dispatch mode.
The range between NofiyListEnd and DispatchListEnd are for NotifyPpi with
CallBack mode.
The range between DispatchListEnd and EndOfPpiListPtrs are for NotifyPpi with
Dispatch mode.
Thanks
Liming
From: Mars Lin [mailto:[email protected]]
Sent: Wednesday, November 06, 2013 5:46 PM
To: [email protected]
Subject: [edk2] Callback mode and Dispatch mode of EFI_PEI_NOTIFY_DESCRIPTOR.
Hi MdeModulePkg.PeiMain maintainer/developers:
I cannot see current Ppi.c->DispatchNotify() uses the passed in parameter
NotifyType for differentiating level of notifications to fire.
Is this one under construction? Or, I missed something in somewhere with this
implemented?
PI 1.3 vol1, page110 says:
With respect to the Flags parameter, the difference between callback and
dispatch mode is as
follows:
* Callback mode: Invokes all of the agents that are registered for notification
immediately after
the PPI is installed.
* Dispatch mode: Calls the agents that are registered for notification only
after the PEIM that
installs the PPI in question has returned to the PEI Foundation.
The callback mechanism will give a better quality of service, but it has the
downside of possibly
deepening the use of the stack (i.e., the agent that installed the PPI that
engenders the notification is
a PEIM itself that has used the stack already). The dispatcher mode, however,
is better from a stack usage
perspective in that when the PEI Foundation invokes the agents that want
notification, the
stack has returned to the minimum stack usage of just the PEI Foundation.
Regards, -Mars
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