OP-TEE: TAs

⚠️ The code is based on: https://gitlab.com/riseproject/riscv-optee/optee_os/-/tree/dev-optee-mpxy

Commit ID: 75df9ba41a404aec897399ead0ff0aebcbff48ca

• entry_open_session()
  • Open the session based on the UUID.
  • tee_ta_open_session()
• tee_ta_open_session()
  • tee_ta_init_session()
  • Call ts_ctx->ops->enter_open_session() callback,
    • For pseudo TAs, the callback is: pseudo_ta_enter_open_session()
    • For user TAs, the callback is user_ta_enter_open_session()
• tee_ta_init_session()
  • Look for already loaded TA
    • tee_ta_init_session_with_context()
  • If the TA for this UUID is not loaded yet:
    • Look for secure partition
      • stmm_init_session()
    • Look for pseudo TA
      • tee_ta_init_pseudo_ta_session()
    • Look for user TA
      • tee_ta_init_user_ta_session()
      • If tee_ta_init_user_ta_session() returns TEE_SUCCESS, call tee_ta_complete_user_ta_session()

• entry_invoke_command()
  • Call tee_ta_get_session() to get the opened session from arg->session.
  • Call tee_ta_invoke_command() on the opened session.
    • Call ts_ctx->ops->enter_invoke_cmd():
    • For pseudo TAs, the callback is: pseudo_ta_enter_invoke_cmd()
    • For user TAs, the call back is: user_ta_enter_invoke_cmd()