MdeModulePkg Variable: Add emulated variable NV mode support

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1323
Merge EmuVariable and Real variable driver.

Add emulated variable NV mode support in real variable driver.
Platform can configure PcdEmuVariableNvModeEnable statically
(build time) or dynamically (boot time) to support emulated
variable NV mode.

If PcdEmuVariableNvModeEnable is configured to dynamic, its
value should be set before Variable driver starts to work,
otherwise default value will take effect.

Then EmuVariableRuntimeDxe could be removed, the removal of
EmuVariableRuntimeDxe will be done after platforms are migrated
to use the merged variable driver.

Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Hao Wu <hao.a.wu@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Star Zeng <star.zeng@intel.com>
Acked-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Jian J Wang <jian.j.wang@intel.com>
Reviewed-by: Hao Wu <hao.a.wu@intel.com>
Tested-by: Julien Grall <julien.grall@arm.com>
Acked-by: Julien Grall <julien.grall@arm.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/MdeModulePkg/Universal/Variable/RuntimeDxe/VariableRuntimeDxe.inf b/MdeModulePkg/Universal/Variable/RuntimeDxe/VariableRuntimeDxe.inf
index 7ef8a97f5d..273067753c 100644
--- a/MdeModulePkg/Universal/Variable/RuntimeDxe/VariableRuntimeDxe.inf
+++ b/MdeModulePkg/Universal/Variable/RuntimeDxe/VariableRuntimeDxe.inf
@@ -9,7 +9,7 @@
 #  This external input must be validated carefully to avoid security issues such as

 #  buffer overflow or integer overflow.

 #

-# Copyright (c) 2006 - 2017, Intel Corporation. All rights reserved.<BR>

+# Copyright (c) 2006 - 2019, Intel Corporation. All rights reserved.<BR>

 # This program and the accompanying materials

 # are licensed and made available under the terms and conditions of the BSD License

 # which accompanies this distribution. The full text of the license may be found at

@@ -131,6 +131,8 @@
   gEfiMdeModulePkgTokenSpaceGuid.PcdMaxUserNvVariableSpaceSize           ## CONSUMES

   gEfiMdeModulePkgTokenSpaceGuid.PcdBoottimeReservedNvVariableSpaceSize  ## CONSUMES

   gEfiMdeModulePkgTokenSpaceGuid.PcdReclaimVariableSpaceAtEndOfDxe  ## CONSUMES

+  gEfiMdeModulePkgTokenSpaceGuid.PcdEmuVariableNvModeEnable         ## SOMETIMES_CONSUMES

+  gEfiMdeModulePkgTokenSpaceGuid.PcdEmuVariableNvStoreReserved      ## SOMETIMES_CONSUMES

 

 [FeaturePcd]

   gEfiMdeModulePkgTokenSpaceGuid.PcdVariableCollectStatistics  ## CONSUMES # statistic the information of variable.