Re: [ros-dev] Save FPU on task switch/SSE support

[Alex Ionescu]

Hi,

As I added the KPRCB I noticed the last field is called NpxSaveArea and 
contains the last FPU/SSE state, iirc.

You might want to save it there...but what troubles me is that the KPRCB 
is a CPU-wide structure, not thread-limited.

Best regards,
Alex Ionescu

Hartmut Birr wrote:
> > -----Original Message-----
> > From: [e-mail] 
> > [mailto:[e-mail]] On Behalf Of Gregor Anich
> > Sent: Friday, October 08, 2004 7:50 PM
> > To: ReactOS Development List
> > Subject: Re: [ros-dev] Save FPU on task switch/SSE support
> >
> > Hi again ;)
> >
> > Do you have any idea where the SSE registers should be stored?
> > The thing with the flag for the FPU state is nice, since it allows to 
> > skip saving of the FPU state when not needed - do you know if 
> > we can do 
> > the same for SSE?
> >
> > Thanks,
> >  blight
>
> We can do the same for sse. If sse is available we must use fxsave/fxrstor
> instead of fsave/frstor and the buffer is 512 byte (108 byte for normal
> fpu).
> Hartmut
>
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