Service backend

Service client interface

Service layer

RPC layer

FF-A layer

FF-A

libsp

libsp

Linux FF-A driver

TS TEE driver

ts_rpc_caller_sp

ts_rpc_endpoint_sp

Attestation
RPC service

Crypto
RPC service

Storage
RPC service

ts_rpc_caller_linux

Attestation
backend

Crypto
backend

Storage
backend

Attestation
RPC caller

Crypto
RPC caller

Storage
RPC caller

Attestation
client

Crypto
client

Storage
client

direct

dummy

rpc_caller_session