Thanks Felix, this is great! I'll change the implementation to just be
this specified thing.

On Wed, Oct 5, 2022 at 9:20 AM Felix Polyudov <fel...@ami.com> wrote:
>
> > On Mon, 3 Oct 2022 at 03:16, Dionna Amalie Glaze
> > <dionnagl...@google.com> wrote:
> > >
> > > >
> > > > Is it defined by UEFI Spec?
> > > >
> > >
> > > It is not. This is Ard's suggested solution
>
> UEFI 2.9 defines new event EFI_EVENT_GROUP_BEFORE_EXIT_BOOT_SERVICES, which 
> serves the same purpose
> and has the timing you've described: "after the time that the timer is 
> disabled and before the MemoryMap is finalized".
>
> Here is event description from the spec (refer to 
> EFI_BOOT_SERVICES.CreateEventEx() section of the UEFI 2.9):
> "This event group is notified by the system when ExitBootServices() is 
> invoked right before notifying EFI_EVENT_GROUP_EXIT_BOOT_SERVICES event 
> group. The event presents the last opportunity to use firmware interfaces in 
> the boot environment."
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-- 
-Dionna Glaze, PhD (she/her)


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