Add a NULL instance of ArmCcaInitPeiLib library that guest firmware
for VMMs that do not implement Arm CCA Realms can use.

Signed-off-by: Sami Mujawar <sami.mujawar@arm.com>
---
 ArmVirtPkg/ArmVirt.dsc.inc                                       |  2 +
 ArmVirtPkg/Library/ArmCcaInitPeiLibNull/ArmCcaInitPeiLibNull.c   | 59 ++++++++++++++++++++
 ArmVirtPkg/Library/ArmCcaInitPeiLibNull/ArmCcaInitPeiLibNull.inf | 27 +++++++++
 3 files changed, 88 insertions(+)

diff --git a/ArmVirtPkg/ArmVirt.dsc.inc b/ArmVirtPkg/ArmVirt.dsc.inc
index 5b18184be2631ce6d158b471c055af9e6e07f4a0..409749297263a13696885d17c6d5554d07c195e4 100644
--- a/ArmVirtPkg/ArmVirt.dsc.inc
+++ b/ArmVirtPkg/ArmVirt.dsc.inc
@@ -189,6 +189,8 @@ [LibraryClasses.common.SEC]
   PeiServicesTablePointerLib|ArmPkg/Library/PeiServicesTablePointerLib/PeiServicesTablePointerLib.inf
   MemoryAllocationLib|MdePkg/Library/PeiMemoryAllocationLib/PeiMemoryAllocationLib.inf
 
+  ArmCcaInitPeiLib|ArmVirtPkg/Library/ArmCcaInitPeiLibNull/ArmCcaInitPeiLibNull.inf
+
 [LibraryClasses.common.PEI_CORE]
   PcdLib|MdePkg/Library/PeiPcdLib/PeiPcdLib.inf
   BaseMemoryLib|MdePkg/Library/BaseMemoryLib/BaseMemoryLib.inf
diff --git a/ArmVirtPkg/Library/ArmCcaInitPeiLibNull/ArmCcaInitPeiLibNull.c b/ArmVirtPkg/Library/ArmCcaInitPeiLibNull/ArmCcaInitPeiLibNull.c
new file mode 100644
index 0000000000000000000000000000000000000000..5b606208dbcf4f0494cde79dd8923ef80fa0137b
--- /dev/null
+++ b/ArmVirtPkg/Library/ArmCcaInitPeiLibNull/ArmCcaInitPeiLibNull.c
@@ -0,0 +1,59 @@
+/** @file
+  Library that implements a NULL implementation of the ArmCcaInitPeiLib.
+
+  Copyright (c) 2022 - 2023, Arm Limited. All rights reserved.<BR>
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+  @par Glossary:
+    - Rsi or RSI   - Realm Service Interface
+    - IPA          - Intermediate Physical Address
+    - RIPAS        - Realm IPA state
+**/
+
+#include <Library/ArmCcaLib.h>
+#include <Library/ArmCcaRsiLib.h>
+#include <Library/ArmMmuLib.h>
+#include <Library/ArmVirtMemInfoLib.h>
+#include <Library/BaseLib.h>
+#include <Library/DebugLib.h>
+#include <Library/MemoryAllocationLib.h>
+#include <Library/PcdLib.h>
+
+/**
+  Configure the System Memory region as Protected RAM.
+
+  When a VMM creates a Realm, a small amount of DRAM (which contains the
+  firmware image) and the initial content is configured as Protected RAM.
+  The remaining System Memory is in the Protected Empty state. The firmware
+  must then initialise the remaining System Memory as Protected RAM before
+  it can be accessed.
+
+  @retval RETURN_SUCCESS            Success.
+  @retval RETURN_INVALID_PARAMETER  A parameter is invalid.
+  @retval RETURN_UNSUPPORTED        The execution context is not in a Realm.
+**/
+RETURN_STATUS
+EFIAPI
+ArmCcaConfigureSystemMemory (
+  VOID
+  )
+{
+  return RETURN_UNSUPPORTED;
+}
+
+/**
+  Perform Arm CCA specific initialisations.
+
+  @retval EFI_SUCCESS               Success or execution context is not a Realm.
+  @retval EFI_OUT_OF_RESOURCES      Out of resources.
+  @retval RETURN_INVALID_PARAMETER  A parameter is invalid.
+**/
+EFI_STATUS
+EFIAPI
+ArmCcaInitialize (
+  VOID
+  )
+{
+  // Noting to do as the execution context is not a Realm.
+  return EFI_SUCCESS;
+}
diff --git a/ArmVirtPkg/Library/ArmCcaInitPeiLibNull/ArmCcaInitPeiLibNull.inf b/ArmVirtPkg/Library/ArmCcaInitPeiLibNull/ArmCcaInitPeiLibNull.inf
new file mode 100644
index 0000000000000000000000000000000000000000..f039c7abdb6d5391f792179546ff9947086fe541
--- /dev/null
+++ b/ArmVirtPkg/Library/ArmCcaInitPeiLibNull/ArmCcaInitPeiLibNull.inf
@@ -0,0 +1,27 @@
+## @file
+#  Library that implements a NULL implementation of the ArmCcaInitPeiLib.
+#
+#  Copyright (c) 2022 - 2023, Arm Limited. All rights reserved.<BR>
+#
+#  SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##
+
+[Defines]
+  INF_VERSION                    = 0x0001001B
+  BASE_NAME                      = ArmCcaInitPeiLib
+  FILE_GUID                      = 60686C60-8433-49EE-9F2C-DDC424A95652
+  MODULE_TYPE                    = BASE
+  VERSION_STRING                 = 1.0
+  LIBRARY_CLASS                  = ArmCcaInitPeiLib
+
+[Sources]
+  ArmCcaInitPeiLibNull.c
+
+[Packages]
+  ArmPkg/ArmPkg.dec
+  ArmVirtPkg/ArmVirtPkg.dec
+  MdePkg/MdePkg.dec
+
+[LibraryClasses]
+  BaseLib
-- 
'Guid(CE165669-3EF3-493F-B85D-6190EE5B9759)'



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