REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4464

As of today, there has been a void in the variable service in PEI phase
on ARM systems that support PEI phase and standalone MM hosted variable
service.

This change adds the support through:
1. Add MM communication services in PEI phase for ARM platforms. This
module is based on SMC calls to standalone MM environments, similar to
"ArmPkg/Drivers/MmCommunicationDxe".

2. A service module that installs `gEfiPeiReadOnlyVariable2PpiGuid` based
on step 1. Note that this driver will not have special dependency on ARM
specific code, thus will be ideally added to MdeModulePkg.

Patch v1 branch: https://github.com/kuqin12/edk2/tree/arm_var_pei_v1

Cc: Hao A Wu <hao.a.wu@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Leif Lindholm <quic_llindhol@quicinc.com>
Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Sami Mujawar <sami.mujawar@arm.com>

Kun Qin (2):
  ArmPkg: MmCommunicationPei: Introduce MM communicate in PEI
  MdeModulePkg: Variable: Introduce MM based variable read service in
    PEI

 ArmPkg/Drivers/MmCommunicationPei/MmCommunicationPei.c          | 178 +++++++++
 MdeModulePkg/Universal/Variable/MmVariablePei/MmVariablePei.c   | 381 ++++++++++++++++++++
 ArmPkg/ArmPkg.dsc                                               |   2 +
 ArmPkg/Drivers/MmCommunicationPei/MmCommunicationPei.h          |  76 ++++
 ArmPkg/Drivers/MmCommunicationPei/MmCommunicationPei.inf        |  41 +++
 MdeModulePkg/MdeModulePkg.dsc                                   |   1 +
 MdeModulePkg/Universal/Variable/MmVariablePei/MmVariablePei.h   | 134 +++++++
 MdeModulePkg/Universal/Variable/MmVariablePei/MmVariablePei.inf |  43 +++
 8 files changed, 856 insertions(+)
 create mode 100644 ArmPkg/Drivers/MmCommunicationPei/MmCommunicationPei.c
 create mode 100644 MdeModulePkg/Universal/Variable/MmVariablePei/MmVariablePei.c
 create mode 100644 ArmPkg/Drivers/MmCommunicationPei/MmCommunicationPei.h
 create mode 100644 ArmPkg/Drivers/MmCommunicationPei/MmCommunicationPei.inf
 create mode 100644 MdeModulePkg/Universal/Variable/MmVariablePei/MmVariablePei.h
 create mode 100644 MdeModulePkg/Universal/Variable/MmVariablePei/MmVariablePei.inf

-- 
2.40.1.windows.1



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