Date: Wed, 20 Sep 1995 11:39:04 -0500 From: "Andrew Webster" <awebster@dataradio.com> To: Lars Koeller <lars.koeller@odie.physik2.uni-rostock.de> Cc: freebsd-questions@freebsd.org Subject: Re: Problems with cpufunc.h Message-ID: <199509201538.LAA06081@vhf.dataradio.com>
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> Date sent: Wed, 20 Sep 1995 16:41:11 +0200
> From: Lars Koeller <lars.koeller@odie.physik2.uni-rostock.de>
> To: freebsd-questions@freefall.freebsd.org
> Subject: Problems with cpufunc.h
> Hello!
>
> I try to compile a library witch communicates with my B008 transputer
> board via inpb/outpb statements. I know of the device driver but there
> occured some problems also! With 1.1.5.1 all runs well with the
> includefile pio.h! Now I change to cpufunc.h but there occured a gcc
> error:
>
> /usr/include/machine/cpufunc.h: In function `inbc':
> /usr/include/machine/cpufunc.h:125: inconsistent operand constraints in an `asm'
> /usr/include/machine/cpufunc.h: In function `outbc':
> /usr/include/machine/cpufunc.h:132: inconsistent operand constraints in an `asm'
>
> Any suggestions?
>
> Thanks
>
> Lars
I've run into this too. It appears as though you can only use the asm
directive (inb is actually define of __asm ("inb %1,%0...)) if you specify
a constant address...Rather annoying.
Further more even if you do specify a constant address, I keep getting Bus
Error, Core dumped from my program (running as root) whenever the i/o
instruction is executed.
Something has changed. In the kernel source, there appears to be
incomplete support for a /dev/io device which will allow you to read/write
the io ports the same way you would access /dev/mem, except that it is not
compiled in unless 'notyet' is defined.
Any one on the "team" care to comment on how to write a program using
in/out instructions (I started working on a TMC driver but ran into this
problem). Or, does -current or -stable now incorporate a functional
/dev/io?
Thanks!
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