On Sunday, July 17, 2011 11:00:29 AM Stephen Wille Padnos did opine:
> gene heskett wrote:
> > On Saturday, July 16, 2011 10:46:42 AM andy pugh did opine:
> >> On 16 July 2011 05:39, Farzin Kamangar<farzin.kaman...@gmail.com>
wrote:
> >>> � � � � � � � �Can you give me some information how can I go ahead
> >>> for EMC? Do I need to write a driver for that? Where is the
> >>> interface data of EMC and PCI hardware?
> >>
> >> Typically you just use inb() and outb() in a driver.
> >> I wrote one for an ISA card a few weeks ago, and it was fairly easy.
> >> http://www.linuxcnc.org/component/option,com_kunena/Itemid,20/func,vi
> >> ew/ catid,38/id,10910/lang,english/
> >
> > Isn't there another function, (ioport?) a sort of a locking mechanism
> > that allows the user exclusive access to the hardware, and a
> > correspond release call to be executed when the user is finished with
> > the hardware?
> >
> > I screwed around with a pci based card with a pile of 8255's in it
> > about 7-8 years ago (before I discovered emc) and had to wrap my
> > stepper motor exercise code inside that pair of calls before it would
> > work. Or is that pci specific?
> >
> > My wet ram could be spoiling, its rather old to be without
> > refrigeration. ;-)
>
> I think you're talking about iopl() or ioperm(). Those are needed for
> your program to gain the privilege of directly accessing IO ports. This
> is only needed in userspace programs, since kernel modules (like the
> whole kernel) run in protected/privileged mode.
>
> To actually do the reads/writes, you use inb/outb, inw/outw, inl/outl.
>
> - Steve
>
Right Steve.
Cheers, gene
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