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+Vendor Specific EL3 Monitor Service Calls
+=========================================
+
+This document enumerates and describes the Vendor Specific EL3 Monitor Service
+Calls.
+
+These are Service Calls defined by the vendor of the EL3 Monitor.
+They are accessed via ``SMC`` ("SMC calls") instruction executed from Exception
+Levels below EL3. SMC calls for Vendor Specific EL3 Monitor Services:
+
+-  Follow `SMC Calling Convention`_;
+-  Use SMC function IDs that fall in the vendor-specific EL3 range, which are
+
++---------------------------+--------------------------------------------------+
+| SMC Function Identifier   | Service Type                                     |
++===========================+==================================================+
+| 0x87000000 - 0x8700FFFF   | SMC32: Vendor Specific EL3 Monitor Service Calls |
++---------------------------+--------------------------------------------------+
+| 0xC7000000 - 0xC700FFFF   | SMC64: Vendor Specific EL3 Monitor Service Calls |
++---------------------------+--------------------------------------------------+
+
+Source definitions for vendor-specific EL3 Monitor Service Calls are located in
+the ``ven_el3_svc.h`` header file.
+
+--------------
+
+*Copyright (c) 2024, Arm Limited and Contributors. All rights reserved.*
+
+.. _SMC Calling Convention: https://developer.arm.com/docs/den0028/latest