Can't mmap the top 1MB of /dev/mem?
Mark S. Mathews
mark at absoval.com
Fri Jun 23 05:50:20 EST 2000
I figured it was something like that. Shouldn't that expression be
testing the topmost address of the mmap'd region instead of one beyond it?
i.e.:
if ( (off+len-1) < off )
return EINVAL;
It works on the G3? Perhaps the compiler/processor difference is getting
you into some of the 64-bit register goofiness or a slightly different
code sequence that does something different w/ the overflow flag. Just
guessing here.
-Mark
On Thu, 22 Jun 2000, Pavel Roskin wrote:
>
> Hello, Mark!
>
> > If it _were_ extremely important I could always trace the mmap system
> > call.
>
> I already know that it happens in do_mmap(), at this point:
>
> /* offset overflow? */
> if (off + len < off)
> return -EINVAL;
>
> I'm puzzled why it doesn't happen on G3.
>
> > _That's_ why Linux is so cool.
>
> Yup.
>
> Pavel
>
>
>
Mark S. Mathews
AbsoluteValue Systems Web: http://www.linux-wlan.com
P.O. Box 941149 e-mail: mark at linux-wlan.com
Maitland, FL 32794-1149 Phone: 407.644.8582
USA Fax: 407.539.1294
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