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下面是代码,vivi中的一小部分

@
@ VIVI magics
@

@ 0x20: magic number so we can verify that we only put
.long 0
@ 0x24:
.long 0
@ 0x28: where this vivi was linked, so we can put it in memory in the right place
.long _start
@ 0x2C: this contains the platform, cpu and machine id
.long ARCHITECTURE_MAGIC
@ 0x30: vivi capabilities
.long 0

请教各位老大，这段代码起什么作用阿

另外.long _start什么意思啊？

程序最开始出有ENTRY(_start)

谢谢！