LPC2294.H的头文件定义里有这几句是什么意思，在哪里用到？知道的帮忙回答一下，谢谢了！
/* 定义固件函数 */
#define rm_init_entry() ((void (*)())(0x7fffff91))()
#define rm_undef_handler() ((void (*)())(0x7fffffa0))()
#define rm_prefetchabort_handler() ((void (*)())(0x7fffffb0))()
#define rm_dataabort_handler() ((void (*)())(0x7fffffc0))()
#define rm_irqhandler() ((void (*)())(0x7fffffd0))()
#define rm_irqhandler2() ((void (*)())(0x7fffffe0))()
#define iap_entry(a, b) ((void (*)())(0x7ffffff1))(a, b) |
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