Hi Christian,

Thank you for your answers.

You are right, you define my application scenario correctly.

Now i am trying implement the solution you have suggested me, but I have an error. I place a file in a ram_fs file system and permit access to the file system to a Noux process. I got the following log messages when I tried to access the file from the Noux process. The name of the Noux process is test. Appreciate if someone can help.

   no RM attachment (READ pf_addr=0 pf_ip=84ad from b2cfd156 test)
   void Genode::Signal_transmitter::submit(unsigned int): failed - error 4
   static void Genode::Pager_object::_page_fault_handler(Genode::addr_t): page fault, thread 'test', cpu 0, ip=84ad, fault 
   address=0x0


Thanks,



On Mon, Oct 19, 2015 at 11:34 AM, Christian Helmuth <christian.helmuth@...1...> wrote:
Hello Joseph,

On Sat, Oct 17, 2015 at 12:31:09PM +0200, Joseph Lee wrote:
> I am running a simple "tz_vmm" example in Genode on imx53 qsb. I have Noux
> application which runs on top of Noux runtime inside the secure world. I
> wanted to access this Noux applications inside tz_vmm application, calling
> a function of Noux application from tz_vmm code. But i have no idea how to
> do that. Could anyone please give me some hint?

What you're trying to achieve is to run two components (tz_vmm and a
Noux process) and trigger the execution of a function in the Noux
process by the tz_vmm component, right? I fear that my rephrasing does
not make anything more clear in your application scenario but I will
nevertheless try to propose a direction to follow.

The Noux environment provides a POSIX runtime and POSIX (pthreads etc.
aside) is all about files when it comes to data exchange. So, you may
monitor a file (e.g., via select()) in the program. If you place the
file in a ram_fs and permit access to the file system to both, the
Noux process and tz_vmm, tz_vmm could trigger code execution in the
Noux process by writing into the file that is monitored. This scenario
should also work on any POSIX system where you may implement a
prototype.

In case I got you wrong, please try to elaborate more on your goals or
give more details about your scenario.

Regards
--
Christian Helmuth
Genode Labs

http://www.genode-labs.com/ · http://genode.org/
https://twitter.com/GenodeLabs · /ˈdʒiː.nəʊd/

Genode Labs GmbH · Amtsgericht Dresden · HRB 28424 · Sitz Dresden
Geschäftsführer: Dr.-Ing. Norman Feske, Christian Helmuth

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