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一个CSL函数我看不懂了帮忙解释一些



CSL_FINST(reg, field, token)这个函数,我看例程的时候  

CSL_FINST(((CSL_DevRegs*)CSL_DEV_REGS)->PERLOCK, DEV_PERLOCK_LOCKVAL,  UNLOCK);函数是这么写的,但是DEV_PERLOCK_LOCKVAL,和这个UNLOCK在工程里却没有定义,我搜索搜到了 #define CSL_DEV_PERLOCK_LOCKVAL_UNLOCK   (0x0F0A0B00u),编译运行都没问题,不知道这是什么用法 ?
求解····