Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.

[H. Peter Anvin]

Rene Herman wrote:
> > Yes, we do.  It's exactly this side effect which makes this safer than 
> > either 0x80 or 0xED -- it's a port that *guaranteed* can't be 
> > reclaimed for other purposes without breaking MS-DOS compatibility.
>
> I see that with CR0.NE set (*) we indeed don't care about IGNNE#...
>
> However, I'm worried about this comment in arch/x86/kernel/i8259_32.c
>
> ===
> /*
>  * New motherboards sometimes make IRQ 13 be a PCI interrupt,
>  * so allow interrupt sharing.
>  */
> ===
>
> Is it really safe to just blindly negate IRQ13 on everything out there, 
> from regular PC through funky embedded thingies?

It's not any IRQ 13, it's IRQ 13 from the FPU.

	-hpa
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