Re: [Xen-devel] hypercall_xlat_continuation()

[Mukesh Rathor <mukesh.rathor@xxxxxxxxxx>]

Ok. Even if I can't make it clearer, at least I'll add few lines of comments 
explaining what's going on, after (and if) I figure it out.
Jan,

It seems assumption is made that a 64bit dom0 will not have a 32bit app making 
hypercall?
BUG_ON(*reg != (unsigned int)*reg);  <====

can you please explain the rationale? Also, can you please comment on other 
checks, dwiddling with mask, setting *id to *reg value, etc. in this function?

thanks,
Mukesh (starting a new campaign against overuse of ## macros in xen)




Keir Fraser wrote:
> Jan wrote it and may still understand it. He's your best hope. If as a
> result you think you can make it clearer, please send a patch. :-)
>
>  -- Keir
>
> On 22/05/2009 03:57, "Mukesh Rathor" <mukesh.rathor@xxxxxxxxxx> wrote:
>
> > Can someone please explain the madness in the else part of this function? The
> > caller magically passes 2 for mask? Is this already documented anywhere by
> > chance for mortals like me :).
> >
> > thanks,
> > Mukesh
> >
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-devel
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