1 files changed, 60 insertions, 0 deletions
diff --git a/ArmPkg/Include/Protocol/PiMmCpuDriverEp.h b/ArmPkg/Include/Protocol/PiMmCpuDriverEp.h
new file mode 100644
index 0000000000..4b2f61fa06
--- /dev/null
+++ b/ArmPkg/Include/Protocol/PiMmCpuDriverEp.h
@@ -0,0 +1,60 @@
+/** @file
+  This file describes the PiMm Cpu Driver Entry Point Protocol.
+  the protocol is for defining handler for mm communication request event
+  according to cpu driver.
+
+  Copyright (c) 2024, Arm Limited. All rights reserved.<BR>
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef PI_MM_CPU_DRIVER_EP_H_
+#define PI_MM_CPU_DRIVER_EP_H_
+
+#include <PiMm.h>
+
+#define EDKII_PI_MM_CPU_DRIVER_EP_GUID  { \
+  0x6ecbd5a1, 0xc0f8, 0x4702, { 0x83, 0x01, 0x4f, 0xc2, 0xc5, 0x47, 0x0a, 0x51 } \
+  }
+
+/**
+  The PI Standalone MM entry point for handling mm communication request
+  Here is an example of how the EDKII_PI_MM_CPU_DRIVER_EP_PROTOCOL
+  is utilized in ARM:
+    1. StandaloneMmCoreEntryPoint loads StandaloneMmCore.
+    2. StandaloneMmCore dispatches all MM drivers,
+       including the StandaloneMmCpu driver.
+    3. The StandaloneMmCpu driver declares its MMI CPU entry point through
+       the PI_MM_CPU_DRIVER_EP_PROTOCOL.
+    4. After all drivers have been dispatched,
+       StandaloneMmCoreEntryPoint retrieves the MMI CPU entry point
+       by locating the protocol.
+    5. The DelegatedEventLoop then calls the MM CPU entry point.
+
+  See StandaloneMmPkg/StandaloneMmCoreEntryPoint/Arm/StandaloneMmCoreEntryPoint.c
+
+  @param  [in] EventId            The event Id based on firmware.
+  @param  [in] CommBufferAddr     Address of the communication buffer.
+
+  @retval   EFI_SUCCESS             Success.
+  @retval   EFI_INVALID_PARAMETER   A parameter was invalid.
+  @retval   EFI_ACCESS_DENIED       Access not permitted.
+  @retval   EFI_OUT_OF_RESOURCES    Out of resources.
+  @retval   EFI_UNSUPPORTED         Operation not supported.
+**/
+typedef
+EFI_STATUS
+(EFIAPI *EDKII_PI_MM_CPU_DRIVER_ENTRYPOINT)(
+  IN UINTN  EventId,
+  IN UINTN  CommBufferAddr
+  );
+
+typedef struct _EDKII_PI_MM_CPU_DRIVER_EP_PROTOCOL EDKII_PI_MM_CPU_DRIVER_EP_PROTOCOL;
+
+struct _EDKII_PI_MM_CPU_DRIVER_EP_PROTOCOL {
+  EDKII_PI_MM_CPU_DRIVER_ENTRYPOINT    PiMmCpuDriverEntryPoint;
+};
+
+extern EFI_GUID  gEdkiiPiMmCpuDriverEpProtocolGuid;
+
+#endif