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

Commit ID: 75df9ba41a404aec897399ead0ff0aebcbff48ca

  • tee_ta_init_pseudo_ta_session()

    • Look up the pseudo TA based on UUID.

    • Create pseudo TA context for the UUID, assign ctx->ts_ctx.ops to pseudo_ta_ops. pseudo_ta_ops will be the global callbacks for the pseudo TAs:

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      // core/kernel/pseudo_ta.c
TEE_Result tee_ta_init_pseudo_ta_session(const TEE_UUID *uuid,
			struct tee_ta_session *s)
{

	.....

  ctx->ref_count = 1;
	ctx->flags = ta->flags;
	stc->pseudo_ta = ta;
	ctx->ts_ctx.uuid = ta->uuid;
	ctx->ts_ctx.ops = &pseudo_ta_ops;

	.....

}

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      // core/kernel/pseudo_ta.c

static const struct ts_ops pseudo_ta_ops = {
	.enter_open_session = pseudo_ta_enter_open_session,
	.enter_invoke_cmd = pseudo_ta_enter_invoke_cmd,
	.enter_close_session = pseudo_ta_enter_close_session,
	.destroy = pseudo_ta_destroy,
};
  • pseudo_ta_enter_open_session()
    • Call stc->pseudo_ta->open_session_entry_point() callback, if defined.

      • E.g. If the opened session is for pseudo TA: rtc.pta, open_session_entry_point() callback is: open_session():

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        // core/pta/rtc.c

pseudo_ta_register(.uuid = PTA_RTC_UUID, .name = PTA_NAME,
		   .flags = PTA_DEFAULT_FLAGS | TA_FLAG_CONCURRENT |
			    TA_FLAG_DEVICE_ENUM,
		   .open_session_entry_point = open_session,
		   .invoke_command_entry_point = invoke_command);
  • pseudo_ta_enter_invoke_cmd()
    • Call stc->pseudo_ta->invoke_command_entry_point() callback.

      • E.g. If the opened session is for pseudo TA: device.pta, invoke_command_entry_point() callback is: invoke_command(), which will call get_devices() to retrieve the UUIDs of the pseudo TAs:

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        // core/pta/device.c

pseudo_ta_register(.uuid = PTA_DEVICE_UUID, .name = PTA_NAME,
		   .flags = PTA_DEFAULT_FLAGS,
		   .invoke_command_entry_point = invoke_command);