From ee283e33953a118ff7a18e5376857c6a6416471c Mon Sep 17 00:00:00 2001
From: Sughosh Ganu <sughosh.ganu@linaro.org>
Date: Fri, 19 Feb 2021 12:05:57 +0530
Subject: [PATCH] ArmPkg: Introduce support for PcdFfaEnable

The Secure Partition(SP) can request services from the Secure
Partition Manager Core(SPMC) either through FF-A calls or through the
existing SVC calls. Add a feature flag Pcd for enabling the FF-A
method -- when this is set to FALSE, the SP uses the existing SVC
calls for making the requests.

Signed-off-by: Sughosh Ganu <sughosh.ganu@linaro.org>
Reviewed-by: Sami Mujawar <sami.mujawar@arm.com>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
---
 ArmPkg/ArmPkg.dec | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/ArmPkg/ArmPkg.dec b/ArmPkg/ArmPkg.dec
index f0b136a57a..a8a22c649f 100644
--- a/ArmPkg/ArmPkg.dec
+++ b/ArmPkg/ArmPkg.dec
@@ -84,6 +84,13 @@
   # hardware coherency (i.e., no virtualization or cache coherent DMA)
   gArmTokenSpaceGuid.PcdNormalMemoryNonshareableOverride|FALSE|BOOLEAN|0x00000043
 
+[PcdsFeatureFlag.AARCH64]
+  ## Used to select method for requesting services from S-EL1.<BR><BR>
+  #   TRUE  - Selects FF-A calls for communication between S-EL0 and SPMC.<BR>
+  #   FALSE - Selects SVC calls for communication between S-EL0 and SPMC.<BR>
+  # @Prompt Enable FF-A support.
+  gArmTokenSpaceGuid.PcdFfaEnable|FALSE|BOOLEAN|0x0000005B
+
 [PcdsFixedAtBuild.common]
   gArmTokenSpaceGuid.PcdTrustzoneSupport|FALSE|BOOLEAN|0x00000006