On Tuesday 15 August 2006 03:43, Kostik Belousov wrote:
> On Mon, Aug 14, 2006 at 11:12:23PM +0600, Stanislav Sedov wrote:
> > On Mon, 14 Aug 2006 11:15:22 -0700
> > John-Mark Gurney <[EMAIL PROTECTED]> mentioned:
> > > 
> > > You should make a MD API for reading these out (if one doesn't already
> > > exist) that handle the faulting for you, and then have your driver hook
> > > into this api...
> > > 
> > > I had to do something similar for accessing PCI config registers
> > > that don't exist and cause a fault...
> > >
> >  
> > Do you know some examples to look at? The problem is that i can't make
> > modifications in trap.c or anywhere else in src tree as such driver
> > isn't likely to become a part of FreeBSD kernel.
> 
> Hmm, I think that jhb@ somewhat misguided your. For kernel-mode faults
> on i386, GPF and Segment not Present faults both results in calling
> of pcb_onfault handler. This is true for both STABLE and CURRENT.
> 
> And this is true for amd64 as well.
> 
> Look at the code at the <arch>/<arch>/trap.c, for arch in i386, amd64.

Hmm, well that's handy then.  Learn something new everyday. :)  You can
see how to use pcb_onfault in some of the routines in i386/i386/support.s.

-- 
John Baldwin
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