feat(drivers/arm/rss): add RSS communication driver
This commit adds a driver to conduct the AP's communication
with the Runtime Security Subsystem (RSS).
RSS is Arm's reference implementation for the CCA HES [1].
It can be considered as a secure enclave to which, for example,
certain services can be offloaded such as initial attestation.
RSS comms driver:
- Relies on MHU v2.x communication IP, using a generic MHU API,
- Exposes the psa_call(..) API to the upper layers.
[1] https://developer.arm.com/documentation/DEN0096/latest
Signed-off-by: Tamas Ban <tamas.ban@arm.com>
Signed-off-by: David Vincze <david.vincze@arm.com>
Change-Id: Ib174ac7d1858834006bbaf8aad0eb31e3a3ad107
diff --git a/include/drivers/arm/rss_comms.h b/include/drivers/arm/rss_comms.h
new file mode 100644
index 0000000..b96c79f
--- /dev/null
+++ b/include/drivers/arm/rss_comms.h
@@ -0,0 +1,15 @@
+/*
+ * Copyright (c) 2022, Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ */
+
+#ifndef RSS_COMMS_H
+#define RSS_COMMS_H
+
+#include <stdint.h>
+
+int rss_comms_init(uintptr_t mhu_sender_base, uintptr_t mhu_receiver_base);
+
+#endif /* RSS_COMMS_H */