kern_threads.c.. upcall question..

[Daniel Eischen]

On Tue, 6 May 2003, Julian Elischer wrote:
> 
> On Tue, 6 May 2003, David Xu wrote:
> 
> > 
> > > I think this could be optimised even more.
> > > (why copy the FP regs if they are not valid) (etc).
> > > but it is an improvement..
> > > 
> > 
> > Why need we an intermediate mcontext_t, why not
> > direct copy the context in trap frame to userland space?
> > This should be fastest. :-)
> 
> this is what I was thinking..
> get_mcontext_user(td, addr)
> [...]

Don't break validation and setting of FP validity and type.
get_mcontext() knows how to mark the validity of the FPU
set and it's type (387 or SSE).  The UTS relies on this
information.  Be very careful.

-- 
Dan Eischen