feat(smccc): add vendor specific el3 id

Add vendor specific el3 function id and update docs for the same.

SMCCC Documentation reference:
https://developer.arm.com/documentation/den0028/latest

Change-Id: Ieeb63608ad74d7b764d7131d8a92ecf10053c50d
Signed-off-by: Govindraj Raja <govindraj.raja@arm.com>

docs/getting_started/rt-svc-writers-guide.rst

@@ -49,8 +49,11 @@ legacy 32-bit software that predates the `SMCCC`_.
     Fast        1      CPU Service calls
     Fast        2      SiP Service calls
     Fast        3      OEM Service calls
-    Fast        4      Standard Service calls
-    Fast       5-47    Reserved for future use
+    Fast        4      Standard Secure Service calls
+    Fast        5      Standard Hypervisor Service Calls
+    Fast        6      Vendor Specific Hypervisor Service Calls
+    Fast        7      Vendor Specific EL3 Monitor Calls
+    Fast       8-47    Reserved for future use
     Fast      48-49    Trusted Application calls
     Fast      50-63    Trusted OS calls
 
@@ -314,7 +317,7 @@ provide this information....
 
 --------------
 
-*Copyright (c) 2014-2023, Arm Limited and Contributors. All rights reserved.*
+*Copyright (c) 2014-2024, Arm Limited and Contributors. All rights reserved.*
 
 .. _SMCCC: https://developer.arm.com/docs/den0028/latest
 .. _PSCI: https://developer.arm.com/documentation/den0022/latest/

include/lib/smccc.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2023, Arm Limited and Contributors. All rights reserved.
+ * Copyright (c) 2016-2024, Arm Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -20,7 +20,7 @@
 						SMCCC_VERSION_MINOR_SHIFT))
 
 #define SMCCC_MAJOR_VERSION U(1)
-#define SMCCC_MINOR_VERSION U(4)
+#define SMCCC_MINOR_VERSION U(5)
 
 /*******************************************************************************
  * Bit definitions inside the function id as per the SMC calling convention
@@ -95,6 +95,8 @@
 #define OEN_STD_HYP_END			U(5)
 #define OEN_VEN_HYP_START		U(6)	/* Vendor Hypervisor Service calls */
 #define OEN_VEN_HYP_END			U(6)
+#define OEN_VEN_EL3_START		U(7)	/* Vendor Specific EL3 Monitor Calls */
+#define OEN_VEN_EL3_END			U(7)
 #define OEN_TAP_START			U(48)	/* Trusted Applications */
 #define OEN_TAP_END			U(49)
 #define OEN_TOS_START			U(50)	/* Trusted OS */