Where can I get the native implementation for a specific IL instruction?

I wan开发者_开发技巧t to take a look at the implementation of a certain IL instruction, for example, box, in SSCLI, where can I get it in the SSCLI 2.0 source?

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I think this is the implementation

C:\Users\preet\Downloads\sscli20_20060311\sscli20\clr\src\vm\methodtable.cpp(1933):OBJECTREF MethodTable::Box(void* data, BOOL mayContainRefs)