On Fri, Dec 18, 2015 at 9:20 AM, Henry Gomersall < [email protected]> wrote:
> On 18/12/15 14:15, Kenneth Adam Miller wrote: > > > On Fri, Dec 18, 2015 at 7:05 AM, Henry Gomersall < > [email protected]> wrote: > >> On 17/12/15 21:35, Kenneth Adam Miller wrote: >> >> Generally uio_dmem_genirq.c builds on top of uio.c, which provides a >> common module basis for isolating code common to the other specific >> modules. But for a specific purpose, uio_dmem_genirq.c has be either >> customized or extended in order that specific memory regions can be set as >> accessible. Most easily, this is done in a first come first serve approach >> by filling out the details (which exactly?) left missing in >> uio_dmem_genirq.c, and to start, that would be in uio_of_genirq_match >> <https://proxy-us.hide.me/go.php?u=zWvu%2Fc4k0RUgdQesK%2F26T4EuwcXktyOuOa%2F3x1F0nLo5r0d9WlQEzfN928BYniutwGWnnJXkaBWcsA6D&b=29> >> . >> >> Am I correct? >> >> >> It's not always necessary to modify uio_dmem_genirq. >> >> > Is it correct though, that I can use another module to stack on top of > uio_dmem_genirq, and that the correct thing to modify is in fact the > variable I mentioned? > > > I don't know the answer to this. I'm pretty new to it myself :) > Well for any other readers of this conversation, compared to my previous (perceived) requirements, I now only need to mmap a specific region of hardware addresses - nothing about custom allocation within that region. I can use /dev/mem, but that's perceived to be a potential security issue that we want to keep mitigated. So, we have decided that a uio driver that filters for the specific hardware address regions that we allow is desirable. I think that uio_dmem_genirq would be the way to go about it, but I am not sure there is any example that exists demonstrating how to edit and then use it. > > > Henry >
_______________________________________________ Kernelnewbies mailing list [email protected] http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
