1 files changed, 75 insertions, 0 deletions
diff --git a/MdeModulePkg/Library/ArmFfaLib/ArmFfaStandaloneMmLib.c b/MdeModulePkg/Library/ArmFfaLib/ArmFfaStandaloneMmLib.c
new file mode 100644
index 0000000..72f9a80
--- /dev/null
+++ b/MdeModulePkg/Library/ArmFfaLib/ArmFfaStandaloneMmLib.c
@@ -0,0 +1,75 @@
+/** @file
+  Arm Ffa library code for StandaloneMmCore.
+
+  Copyright (c) 2024, Arm Limited. All rights reserved.<BR>
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+   @par Glossary:
+     - FF-A - Firmware Framework for Arm A-profile
+
+   @par Reference(s):
+     - Arm Firmware Framework for Arm A-Profile [https://developer.arm.com/documentation/den0077/latest]
+
+**/
+
+#include <PiMm.h>
+
+#include <Library/ArmLib.h>
+#include <Library/ArmSmcLib.h>
+#include <Library/ArmFfaLib.h>
+#include <Library/BaseLib.h>
+#include <Library/BaseMemoryLib.h>
+#include <Library/DebugLib.h>
+
+#include "ArmFfaCommon.h"
+#include "ArmFfaRxTxMap.h"
+
+/**
+  ArmFfaLib Constructor.
+
+  @param  [in]  ImageHandle     The firmware allocated handle for the EFI image
+  @param  [in]  MmSystemTable   A pointer to the Management mode System Table
+
+  @retval EFI_SUCCESS            Success
+  @retval Others                 Error
+
+**/
+EFI_STATUS
+EFIAPI
+ArmFfaStandaloneMmLibConstructor (
+  IN EFI_HANDLE           ImageHandle,
+  IN EFI_MM_SYSTEM_TABLE  *MmSystemTable
+  )
+{
+  EFI_STATUS  Status;
+
+  Status = ArmFfaLibCommonInit ();
+  if (Status == EFI_UNSUPPORTED) {
+    /*
+     * EFI_UNSUPPORTED means FF-A interface isn't available.
+     * However, for Standalone MM modules, FF-A availability is not required.
+     * i.e. Standalone MM could use SpmMm as a legitimate protocol.
+     * Thus, returning EFI_SUCCESS here to avoid the entrypoint to assert.
+     */
+    return EFI_SUCCESS;
+  }
+
+  if (EFI_ERROR (Status)) {
+    DEBUG ((DEBUG_ERROR, "%a failed. Status = %r\n", __func__, Status));
+  }
+
+  Status = ArmFfaLibRxTxMap ();
+  if (Status == EFI_ALREADY_STARTED) {
+    /*
+     * When first Stmm instance (most likely core) which uses ArmFfaLib loaded,
+     * It already maps Rx/Tx buffer.
+     * From Next Stmm instance which uses ArmFfaLib it doesn't need to map Rx/Tx
+     * buffer again but it uses the mapped one.
+     */
+    Status = EFI_SUCCESS;
+  } else if (EFI_ERROR (Status)) {
+    DEBUG ((DEBUG_ERROR, "%a failed. Status = %r\n", __func__, Status));
+  }
+
+  return Status;
+}