We get the server's four byte time Unix epoch time representation and its 28 random bytes that will be used later.

我们得到服务器返回的四字节的Unix时间戳以及28字节的随机数，它也将在后面使用（译注：注Clien Hello是发了一个随机数，这两个随机数将用于产生最后的对称密钥）。

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Using the TB register and the values exposed in the systemcfg structure, elapsed time since the epoch with nanosecond precision can be calculated as.

使用TB寄存器和systemcfg结构中的值，就可以按纳秒精度计算从UNIX纪元到现在经过的时间，方法如下。

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