Hi, I have an i.MX53 QSB development board and I want to experiment with ARM TrustZone.
I'm a beginner with regards to genode and kernel development in general.
I was able to run tz_vmm on the QSB and interact with the linux which runs in normal world. What I want to do next is a fairly simple system where inside linux I can call an SMC and switch to the secure world, then whilst in secure world print something (like "Hello From Secure World" and also print some argument from the normal world) and then go back to linux.
I have read some of the messages in the mailing list and I noticed some of you (other mailing list subscribers) already achieved similar communication protocols but because I'm new to genode I don't know where to start.
I know I probably have to create a kernel module for the linux running in normal world so I can call SMC from a userspace application, but I don't know how to do that since I don't see where the linux is being compiled for genode [1]. Do I have to compile another linux? How do I incorporate this new linux version to work with genode?
Besides this I also don't know where to start modifying tz_vmm in order to achieve my goals. I know where tz_vmm's code is but I don't know where to start changing it. I have also seen some mailing list questions regarding the world switch from secure world to normal world. It seems that from normal to secure you should call an SMC, but from secure to normal the monitor mode implementation cannot handle entries from the secure world and thus no SMC can be called directly [2].
Can you give my some feedback on how to achieve these things on the i.MX53 QSB?
Thanks in advance, Tiago