Hello Franc, On Mon, Jan 19, 2015 at 03:34:06PM +0530, Franc sylvester wrote: > I am stuck at one point because of lack of understanding in Genode, > Actually I want to execute some assembly instruction in privileged mode in > base-hw kernel from a user script. > > So I need to know, How will I add a kernel module which will execute > assembly instruction and how can I call this module from the user space. > > And if there is already any such modules exist in Genode that will really > help me to understand the flow mechanism, Let me know.
The answer to your question heavily depends on the task you address. From my point of view, it's better to stay away from any "general" solution to load code into the kernel resp. execute arbitrary instructions in kernel mode. At last, base-hw is a microkernel and should stay that way. To give an example, we extended base-hw for USB SOF interrupt filtering for the Raspberry Pi last autumn to highly reduce the impact on the system load. Therefore, we implemented a special case in the interrupt handling code https://github.com/genodelabs/genode/commit/58a1e42201d2ad26eb1eee398fbf792683925bd8 The feature does not affect the kernel integrity as it just moves one single aspect of the driver into the kernel: Filter high-frequency interrupts that do not have to be handled in user mode. The kernel interrupt handler drops all incoming interrupts of the DWC device while the incoming frame number is smaller than the frame number scheduled by the user-level device driver. Could you provide us with more information about what you like to achieve? Is it really necessary to add a new system call? Would it be feasible to introduce an abstraction that solves the issue? 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 ------------------------------------------------------------------------------ New Year. New Location. New Benefits. New Data Center in Ashburn, VA. GigeNET is offering a free month of service with a new server in Ashburn. Choose from 2 high performing configs, both with 100TB of bandwidth. Higher redundancy.Lower latency.Increased capacity.Completely compliant. http://p.sf.net/sfu/gigenet _______________________________________________ genode-main mailing list genode-main@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/genode-main