How to get the source code for Hwi_create()

Hi

I want to study the how Hwi_create() works, but there is no source code for Hwi_create(). 

Now I have a question, as SYS/BIOS 6.x is provided with full source code and requires no runtime license fees, how can I get the source code for Hwi_create()?

BTW: Hwi_create() will call  xdc_runtime_Core_createObject__I( ), the source code for xdc_runtime_Core_createObject__I( ) is not provided.

Thank you very much!