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SubjectRe: i387/FPU init issues...

* jamal <hadi@cyberus.ca> wrote:

> > we have:
> > #define P6_NOP3 ".byte 0x0f,0x1f,0x00\n"
>
> Dang - I feel i should have saved myself all that git bisecting
> and just posted the oops ;->

your bisection was still very useful - it pinpointed the NOPs - the
assembly code around the NOP changed so a different length NOP was
patched in => which did not work on your CPU. So thanks for that! The
fix is already in x86.git (we'll update the commit log).

> > So the alternatives code applies the wrong nop padding for your CPU.
> > This was probably introduced with commit
> > 32c464f5d9701db45bc1673288594e664065388e.
> >
> > Jan, are you sure that P3 knows the P6 NOPs ? AFAICT its P4, but I
> > have to dig up the manuals.
> >
> > Jamal, does the following patch solve your problem ?
>
> Indeed it does - thanks.

great. So this NOP is indeed not generally known to all "P6 and later"
CPUs. (the PII)

Ingo


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