UEFI spec describes that the event presents the last opportunity to use 
firmware interfaces in the boot environment.

So, I agree that this event notification is placed before Disable Timer. 

Reviewed-by: Liming Gao <gaolim...@byosoft.com.cn>

Thanks
Liming
> -----邮件原件-----
> 发件人: devel@edk2.groups.io <devel@edk2.groups.io> 代表 Dionna Glaze
> via groups.io
> 发送时间: 2022年10月6日 4:59
> 收件人: Tom Lendacky <thomas.lenda...@amd.com>
> 抄送: devel@edk2.groups.io; Gerd Hoffmann <kra...@redhat.com>; James
> Bottomley <j...@linux.ibm.com>; Jiewen Yao <jiewen....@intel.com>; Ard
> Biesheuvel <a...@kernel.org>; Min M. Xu <min.m...@intel.com>; Andrew
> Fish <af...@apple.com>; Michael D. Kinney <michael.d.kin...@intel.com>;
> Ray Ni <ray...@intel.com>
> 主题: Re: [edk2-devel] [PATCH v7 3/7] MdeModulePkg: Notify
> BeforeExitBootServices in CoreExitBootServices
> 
> The specification says that disabling the timer should happen right
> after. Ard told me it should still work this way.
> 
> On Wed, Oct 5, 2022 at 1:50 PM Tom Lendacky <thomas.lenda...@amd.com>
> wrote:
> >
> > On 10/5/22 15:33, Dionna Glaze wrote:
> > > Location of notification is has been specified in UEFI v2.9.
> > >
> > > Cc: Gerd Hoffmann <kra...@redhat.com>
> > > Cc: James Bottomley <j...@linux.ibm.com>
> > > Cc: Jiewen Yao <jiewen....@intel.com>
> > > Cc: Tom Lendacky <thomas.lenda...@amd.com>
> > > Cc: Ard Biesheuvel <a...@kernel.org>
> > > Cc: "Min M. Xu" <min.m...@intel.com>
> > > Cc: Andrew Fish <af...@apple.com>
> > > Cc: "Michael D. Kinney" <michael.d.kin...@intel.com>
> > > Cc: Ray Ni <ray...@intel.com>
> > >
> > > Signed-off-by: Dionna Glaze <dionnagl...@google.com>
> > > ---
> > >   MdeModulePkg/Core/Dxe/DxeMain.inf       | 1 +
> > >   MdeModulePkg/Core/Dxe/DxeMain/DxeMain.c | 6 ++++++
> > >   2 files changed, 7 insertions(+)
> > >
> > > diff --git a/MdeModulePkg/Core/Dxe/DxeMain.inf
> b/MdeModulePkg/Core/Dxe/DxeMain.inf
> > > index e4bca89577..35d5bf0dee 100644
> > > --- a/MdeModulePkg/Core/Dxe/DxeMain.inf
> > > +++ b/MdeModulePkg/Core/Dxe/DxeMain.inf
> > > @@ -100,6 +100,7 @@
> > >     gEfiEventVirtualAddressChangeGuid             ## CONSUMES
> ## Event
> > >     ## CONSUMES   ## Event
> > >     ## PRODUCES   ## Event
> > > +  gEfiEventBeforeExitBootServicesGuid
> > >     gEfiEventExitBootServicesGuid
> > >     gEfiHobMemoryAllocModuleGuid                  ##
> SOMETIMES_CONSUMES   ## HOB
> > >     gEfiFirmwareFileSystem2Guid                   ## CONSUMES
> ## GUID # Used to compare with FV's file system guid and get the FV's file
> system format
> > > diff --git a/MdeModulePkg/Core/Dxe/DxeMain/DxeMain.c
> b/MdeModulePkg/Core/Dxe/DxeMain/DxeMain.c
> > > index 5733f0c8ec..4683016ed7 100644
> > > --- a/MdeModulePkg/Core/Dxe/DxeMain/DxeMain.c
> > > +++ b/MdeModulePkg/Core/Dxe/DxeMain/DxeMain.c
> > > @@ -763,6 +763,12 @@ CoreExitBootServices (
> > >   {
> > >     EFI_STATUS  Status;
> > >
> > > +  //
> > > +  // Notify other drivers of their last chance to use boot services
> > > +  // before the memory map is terminated.
> > > +  //
> > > +  CoreNotifySignalList (&gEfiEventBeforeExitBootServicesGuid);
> >
> > Isn't this supposed to be after disabling the timer?
> >
> > Thanks,
> > Tom
> >
> > > +
> > >     //
> > >     // Disable Timer
> > >     //
> 
> 
> 
> --
> -Dionna Glaze, PhD (she/her)
> 
> 
> 
> 





-=-=-=-=-=-=-=-=-=-=-=-
Groups.io Links: You receive all messages sent to this group.
View/Reply Online (#94853): https://edk2.groups.io/g/devel/message/94853
Mute This Topic: https://groups.io/mt/94228200/21656
Group Owner: devel+ow...@edk2.groups.io
Unsubscribe: https://edk2.groups.io/g/devel/unsub [arch...@mail-archive.com]
-=-=-=-=-=-=-=-=-=-=-=-


Reply via email to