On 5/17/2024 4:49 PM, duntan via groups.io wrote:
This patch set defines a new VARIABLE_RUNTIME_CACHE_INFO HOB. The HOB is used
to store the address and size of the buffer that will be used for variable
runtime service when the PcdEnableVariableRuntimeCache is TRUE.
In following patches, when PcdEnableVariableRuntimeCache is TRUE, VariablePei
will install a callback of gEfiPeiMemoryDiscoveredPpiGuid to allocate the
needed buffer for different type variable runtime cache and build the HOB.
Then VariableSmmRuntimeDxe driver will consume
gEdkiiVariableRuntimeCacheInfoHobGuid to initialize the variable runtime cache
related content. The code to allocate and unblock the runtime cache buffer in
VariableSmmRuntimeDxe is also removed in this patc set.
PR for review: https://github.com/tianocore/edk2/pull/5607
Per design, SMM or StandaloneMM needs to access these runtime cache
buffers for cache coherency. I'm not sure how to implement the
MmUnblockMemoryLib for ARM to dynamically request mapping of the
non-secure runtime cache buffers in StandaloneMM (Secure World). Is it
possible to have these runtime buffers allocated statically with
predefined PCD at build time. On ARM, they can also define the buffers
in device tree (manifest)?
Thanks,
Nhi
-=-=-=-=-=-=-=-=-=-=-=-
Groups.io Links: You receive all messages sent to this group.
View/Reply Online (#119068): https://edk2.groups.io/g/devel/message/119068
Mute This Topic: https://groups.io/mt/106150796/21656
Group Owner: devel+ow...@edk2.groups.io
Unsubscribe: https://edk2.groups.io/g/devel/unsub [arch...@mail-archive.com]
-=-=-=-=-=-=-=-=-=-=-=-
