Hello Tomas, outb() and inb() are actually realized by the correspondend x86 CPU commands (Please see the Intel/AMD references for details). Thus, there is no mode switch as this not a system call. The same is with memory mapped IO. I use this regularly to access (proprietary) PCI hardware directly from user space. This works perfectly.
Regards Mathias > Hello, > > is it possible to access I/O port on x86 solely from Xenomai user-space > primary domain ? I assume that iopl() and then outb(), inb() should > work. But, how to avoid switches to secondary domain ? > > Similarly, for physical memory, there is an example in Xenomai > distribution that mmaps /dev/mem. Is there a way to avoid switches here ? > > Thanks, > Tomas > > > _______________________________________________ > Xenomai-help mailing list > [email protected] > https://mail.gna.org/listinfo/xenomai-help > -- Mathias Koehrer [EMAIL PROTECTED] Jetzt komfortabel bei Arcor-Digital TV einsteigen: Mehr Happy Ends, mehr Herzschmerz, mehr Fernsehen! Erleben Sie 50 digitale TV Programme und optional 60 Pay TV Sender, einen elektronischen Programmführer mit Movie Star Bewertungen von TV Movie. Außerdem, aktuelle Filmhits und prickelnde Erotik in der Arcor-Videothek. Infos unter www.arcor.de/tv _______________________________________________ Xenomai-help mailing list [email protected] https://mail.gna.org/listinfo/xenomai-help
