Noux application

Joseph Lee leejose911 at ...9...
Tue Oct 20 17:15:29 CEST 2015

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


On Mon, Oct 19, 2015 at 11:34 AM, Christian Helmuth <
christian.helmuth at ...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
> ·
> · /ˈdʒiː.nəʊd/
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