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28388D上关于IPC部分CM与CPU1/2之间的数据结构定义问题

Other Parts Discussed in Thread: C2000WARE

28388D上关于IPC部分CM与CPU1/2之间的数据结构定义,在IPC的头文件中的最后,只看到了如下所示的外部定义:

不明白的是,此处仅针对CPU1或者CPU2做了是否define的判断,却没有CM的define判断,怎么理解?