On 06/17/20 07:30, Liu, Zhiguang wrote:
> Hi Laszlo,
> Thanks for the comments, I will take the first one.
> But I can't find service to unregister protocol notify in
> EFI_SMM_SYSTEM_TABLE2.
> Do you now how the unregister it in SMM driver?
It's a bit hidden, but it is explained by the PI spec, under
MmRegisterProtocolNotify():
If Function == NULL and Registration is an existing registration,
then the callback is unhooked. *Protocol must be validated it with
*Registration. If Registration is not found then EFI_NOT_FOUND is
returned.
So where you do
gSmst->SmmRegisterProtocolNotify (
&gEfiSmmEndOfDxeProtocolGuid,
SmmEndOfDxeNotify,
&Registration
);
in PiCpuSmmEntry(), you'd have to save the registration value into a
global variable (which would live in SMRAM):
VOID *mEndOfDxeRegistration;
gSmst->SmmRegisterProtocolNotify (
&gEfiSmmEndOfDxeProtocolGuid,
SmmEndOfDxeNotify,
&mEndOfDxeRegistration // <----- here
);
Then in SmmEndOfDxeNotify(), you could call
Status = gSmst->SmmRegisterProtocolNotify (
&gEfiSmmEndOfDxeProtocolGuid,
NULL,
&mEndOfDxeRegistration
);
ASSERT_EFI_ERROR (Status);
You can see examples in:
- MdeModulePkg/Library/PiDxeS3BootScriptLib/BootScriptSave.c
- MdeModulePkg/Library/SmmLockBoxLib/SmmLockBoxSmmLib.c
- MdePkg/Library/SmmIoLib/SmmIoLib.c
- MdePkg/Library/SmmMemLib/SmmMemLib.c
Thanks
Laszlo
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