Asynchronous exception routing
1、Routing when both EL3 and EL2 are implemented (continued)
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这张表看似内容很多，但我们只分析我们常用的场景;
该表的前半部分NS=0后半部分NS=1，前半部分和后半部分的内容几乎是一样的，我们只要看前部分就可以了，另外EEL2=1（开启secEL2）的我们暂时不分析，所有也就只剩下了前三行；
第一行:RW=0, 也就是routing到aarch32中；
第二行，RW=1,EA/IRQ/FIQ=0，中断routing到aarch64的EL1
第二行，RW=1,EA/IRQ/FIQ=0，中断routing到aarch64的EL3
2、Routing when EL3 is implemented and EL2 is not implemented
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3、Routing when EL3 is not implemented and EL2 is implemented
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Asynchronous exception masking
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1、Physical interrupt target and masking when both EL3 and EL2 are implemented
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2、Physical interrupt target and masking when EL3 is implemented and EL2 is not implemented
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3、Physical interrupt target and masking when EL3 is not implemented and EL2 is implemented
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