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OP-TEE两系统通信的问题

各位好!

             关于OP-TEE最近看了相关的资料,有个问题没有理清楚:op-tee中,非安全的应用程序A调用客户端的API是如何将数据给安全应用程序B的?看了OP-TEE有关tee规范中客户端API和内部API的测试例子没有看出这一过程,麻烦大家给予指点

谢谢啦