Trusted Execution Environment Extensible Computing Device Interface

Constructs to define a Trusted Execution Environment Driver that can implement a standard communication interface in a first environment for discovering and/or exchanging messages with secure applications/services executed in a Trusted Execution Environment (TrEE). The first environment can represent an environment with a different security policy from the TrEE. The TrEE driver can include a standard interface and/or mechanism by which applications/services and drivers within a first environment can access secure applications/services in the TrEE, a standard interface and/or mechanism by which third-party vendors can expose their TrEE applications/services to a first environment, a standard interface and/or mechanism by which a TrEE can request applications/services, on its own behalf, from the first environment, and a standard interface and/or mechanism to facilitate the management of secure application/services and/or provide I/O prioritization and security protection for individual secure applications/services.