roell@informatik.tu-muenchen.de (Thomas Roell) (03/08/91)
I have following *little* problem: I want to map some I/O ports into a
application so I don't have to write an extra hardware driver. This is
primary for performance reasons. "This is simple!",everbody cheers. Just use:
ioctl("/dev/console", KDENABIO, 1); /* just symbolically written */
This is true for the ports withing 0x000 - 0x3FF. But the device I have to
deal with is one that also uses other ports (0x9ee8 for ex.). "No problem!", I
hear from some guys with a little more expierence. Just use the following
beast:
sysi86(SI86V86, V86SC_IOPL, PS_IOPL)
(this allows indeed general io access)
But the IOPL is adjusted every time a signal is recieved by a process. And this
might be in the middle of a io-sequence. Thus this solution is inusable, too.
Now is there a way to get such IOPL with those problems ?
- Thomas
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