From: Achin Gupta <achin.gu...@arm.com>
This patch invokes the FFA_ID_GET to obtain and stash the ID of the the
FF-A partition that implements the DXE MM communication driver. This ID
is used in subsequent patches for sending and receiving MM communication
protocol requests and responses that are packaged as FF-A messages.
Signed-off-by: Achin Gupta <achin.gu...@arm.com>
Signed-off-by: Nishant Sharma <nishant.sha...@arm.com>
---
ArmPkg/Include/IndustryStandard/ArmFfaSvc.h | 1 +
ArmPkg/Drivers/MmCommunicationDxe/MmCommunication.c | 22 ++++++++++++++++++++
2 files changed, 23 insertions(+)
diff --git a/ArmPkg/Include/IndustryStandard/ArmFfaSvc.h
b/ArmPkg/Include/IndustryStandard/ArmFfaSvc.h
index 4a51f9fb56af..20eeb822ea56 100644
--- a/ArmPkg/Include/IndustryStandard/ArmFfaSvc.h
+++ b/ArmPkg/Include/IndustryStandard/ArmFfaSvc.h
@@ -17,6 +17,7 @@
#define ARM_FFA_SVC_H_
#define ARM_SVC_ID_FFA_VERSION_AARCH32 0x84000063
+#define ARM_SVC_ID_FFA_ID_GET_AARCH32 0x84000069
#define ARM_SVC_ID_FFA_MSG_SEND_DIRECT_REQ_AARCH32 0x8400006F
#define ARM_SVC_ID_FFA_MSG_SEND_DIRECT_RESP_AARCH32 0x84000070
#define ARM_SVC_ID_FFA_MSG_SEND_DIRECT_REQ_AARCH64 0xC400006F
diff --git a/ArmPkg/Drivers/MmCommunicationDxe/MmCommunication.c
b/ArmPkg/Drivers/MmCommunicationDxe/MmCommunication.c
index a6fcd590a65b..f907ccf7349f 100644
--- a/ArmPkg/Drivers/MmCommunicationDxe/MmCommunication.c
+++ b/ArmPkg/Drivers/MmCommunicationDxe/MmCommunication.c
@@ -23,6 +23,11 @@
#include "MmCommunicate.h"
+//
+// Partition ID if FF-A support is enabled
+//
+STATIC UINT16 mFfaPartId;
+
//
// Address, Length of the pre-allocated buffer for communication with the
secure
// world.
@@ -288,6 +293,23 @@ GetMmCompatibility (
Status = EFI_UNSUPPORTED;
}
+ // If FF-A is supported then discover our ID.
+ if (FixedPcdGet32 (PcdFfaEnable) != 0) {
+
+ // Get our ID
+ ZeroMem(&SmcArgs, sizeof(SmcArgs));
+ SmcArgs.Arg0 = ARM_SVC_ID_FFA_ID_GET_AARCH32;
+ ArmCallSmc (&SmcArgs);
+ if (SmcArgs.Arg0 == ARM_SVC_ID_FFA_ERROR_AARCH32) {
+ DEBUG ((DEBUG_ERROR, "Unable to retrieve FF-A partition ID (%d).\n",
SmcArgs.Arg2));
+ return EFI_UNSUPPORTED;
+ }
+ DEBUG ((DEBUG_INFO, "FF-A partition ID = 0x%lx.\n", SmcArgs.Arg2));
+ mFfaPartId = SmcArgs.Arg2;
+
+ return EFI_SUCCESS;
+ }
+
return Status;
}
--
2.34.1
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