[edk2-devel] [PATCH v3 14/20] ArmPkg: Allow SMC/HVC monitor conduit to be specified at runtime

["Doug Flick via groups.io" <dougflick=microsoft.com@groups.io>]

From: Ard Biesheuvel <ardb@kernel.org>

ArmVirtQemu may execute at EL2, in which case monitor calls are
generally made using SMC instructions instead of HVC instructions.

Whether or not this is the case can only be decided at runtime, and so
the associated PCD needs to be settable at runtime, if the platform
definition chooses so. This implies a boolean PCD, given that a feature
PCD is build-time configurable only.

Cc: Leif Lindholm <quic_llindhol@quicinc.com>
Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Sami Mujawar <sami.mujawar@arm.com>

Committed-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Doug Flick [MSFT] <doug.edk2@gmail.com>
---
 ArmPkg/ArmPkg.dec                            | 10 +++++-----
 ArmPkg/Library/ArmMonitorLib/ArmMonitorLib.c |  2 +-
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/ArmPkg/ArmPkg.dec b/ArmPkg/ArmPkg.dec
index 7fe2b9bca4..ac030e295b 100644
--- a/ArmPkg/ArmPkg.dec
+++ b/ArmPkg/ArmPkg.dec
@@ -139,11 +139,6 @@
   # Define if the GICv3 controller should use the GICv2 legacy
   gArmTokenSpaceGuid.PcdArmGicV3WithV2Legacy|FALSE|BOOLEAN|0x00000042
 
-  ## Define the conduit to use for monitor calls.
-  # Default PcdMonitorConduitHvc = FALSE, conduit = SMC
-  # If PcdMonitorConduitHvc = TRUE, conduit = HVC
-  gArmTokenSpaceGuid.PcdMonitorConduitHvc|FALSE|BOOLEAN|0x00000047
-
   # Whether to remap all unused memory NX before installing the CPU arch
   # protocol driver. This is needed on platforms that map all DRAM with RWX
   # attributes initially, and can be disabled otherwise.
@@ -317,6 +312,11 @@
   gArmTokenSpaceGuid.PcdSystemBiosRelease|0xFFFF|UINT16|0x30000058
   gArmTokenSpaceGuid.PcdEmbeddedControllerFirmwareRelease|0xFFFF|UINT16|0x30000059
 
+  ## Define the conduit to use for monitor calls.
+  # Default PcdMonitorConduitHvc = FALSE, conduit = SMC
+  # If PcdMonitorConduitHvc = TRUE, conduit = HVC
+  gArmTokenSpaceGuid.PcdMonitorConduitHvc|FALSE|BOOLEAN|0x00000047
+
 [PcdsFixedAtBuild.common, PcdsDynamic.common]
   #
   # ARM Architectural Timer
diff --git a/ArmPkg/Library/ArmMonitorLib/ArmMonitorLib.c b/ArmPkg/Library/ArmMonitorLib/ArmMonitorLib.c
index 741f5c6157..ec5b0b6619 100644
--- a/ArmPkg/Library/ArmMonitorLib/ArmMonitorLib.c
+++ b/ArmPkg/Library/ArmMonitorLib/ArmMonitorLib.c
@@ -26,7 +26,7 @@ ArmMonitorCall (
   IN OUT ARM_MONITOR_ARGS  *Args
   )
 {
-  if (FeaturePcdGet (PcdMonitorConduitHvc)) {
+  if (PcdGetBool (PcdMonitorConduitHvc)) {
     ArmCallHvc ((ARM_HVC_ARGS *)Args);
   } else {
     ArmCallSmc ((ARM_SMC_ARGS *)Args);
-- 
2.34.1



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