[PATCH v3 4/6] MdeModulePkg/DxeIpl: Introduce PCD PcdUse5LevelPageTable

["Ni, Ray" <ray.ni@intel.com>]

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=2008

The PCD indicates if 5-Level Paging will be enabled in long mode.
5-Level Paging will not be enabled when the PCD is TRUE but CPU
doesn't support 5-Level Paging.

Signed-off-by: Ray Ni <ray.ni@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Hao A Wu <hao.a.wu@intel.com>
Cc: Jian J Wang <jian.j.wang@intel.com>
---
 MdeModulePkg/MdeModulePkg.dec | 7 +++++++
 MdeModulePkg/MdeModulePkg.uni | 8 ++++++++
 2 files changed, 15 insertions(+)

diff --git a/MdeModulePkg/MdeModulePkg.dec b/MdeModulePkg/MdeModulePkg.dec
index 12e0bbf579..21388595a9 100644
--- a/MdeModulePkg/MdeModulePkg.dec
+++ b/MdeModulePkg/MdeModulePkg.dec
@@ -1991,6 +1991,13 @@ [PcdsFixedAtBuild, PcdsPatchableInModule, PcdsDynamic, PcdsDynamicEx]
   # @Prompt The address mask when memory encryption is enabled.
   gEfiMdeModulePkgTokenSpaceGuid.PcdPteMemoryEncryptionAddressOrMask|0x0|UINT64|0x30001047
 
+  ## Indicates if 5-Level Paging will be enabled in long mode. 5-Level Paging will not be enabled
+  #  when the PCD is TRUE but CPU doesn't support 5-Level Paging.
+  #   TRUE  - 5-Level Paging will be enabled.<BR>
+  #   FALSE - 5-Level Paging will not be enabled.<BR>
+  # @Prompt Enable 5-Level Paging support in long mode. 
+  gEfiMdeModulePkgTokenSpaceGuid.PcdUse5LevelPageTable|FALSE|BOOLEAN|0x0001105F
+
   ## Capsule In Ram is to use memory to deliver the capsules that will be processed after system
   #  reset.<BR><BR>
   #  This PCD indicates if the Capsule In Ram is supported.<BR>
diff --git a/MdeModulePkg/MdeModulePkg.uni b/MdeModulePkg/MdeModulePkg.uni
index 2bd1ad29f2..3a1c88e4c5 100644
--- a/MdeModulePkg/MdeModulePkg.uni
+++ b/MdeModulePkg/MdeModulePkg.uni
@@ -1298,3 +1298,11 @@
                                                                                    "It is used to set VPD region base address. So, it can't be DynamicExVpd PCD. Its value is"
                                                                                    "required to be accessed in PcdDxe driver entry point. So, its value must be set in PEI phase."
                                                                                    "It can't depend on EFI variable service, and can't be DynamicExHii PCD."
+
+#string STR_gEfiMdeModulePkgTokenSpaceGuid_PcdUse5LevelPageTable_PROMPT  #language en-US "Enable 5-Level Paging support in long mode"
+
+#string STR_gEfiMdeModulePkgTokenSpaceGuid_PcdUse5LevelPageTable_HELP  #language en-US "Indicates if 5-Level Paging will be enabled in long mode. 5-Level Paging will not be enabled"
+                                                                                    "when the PCD is TRUE but CPU doesn't support 5-Level Paging."
+                                                                                    " TRUE  - 5-Level Paging will be enabled."
+                                                                                    " FALSE - 5-Level Paging will not be enabled."
+ 
-- 
2.21.0.windows.1