ARM CoreSight DAP Open Source model

Hello, I am currently involving into the OSS Hardware Development. And what I found is that the need on ARM CoreSight DAP Model comes for our debug system. 

So I am wondering on these questions.

1. Is there any open source verilog model on ARM CoreSight DAP Model with APB Interface? Because currently the debug logic itself has the APB Slave interface to configure and we are trying to verify whether this is applicable with ARM CoreSight DAP Model. 

2. If there is no ARM CoreSight DAP Model in open source community, Would it be okay to make ARM CoreSight Simulation model and publish into Open Source Project; like github? 

Thanks for answering. I have no knowledge on this field; especially OSS policy on developing proprietary IP.