Re: Calling current() from interrupt context

From: Andi Kleen (
Date: Mon Oct 09 2000 - 17:44:58 EST

On Mon, Oct 09, 2000 at 11:41:13PM +0100, Alan Cox wrote:
> > The problem is where to get the cpuid from (see how smp_processor_id
> > is currently defined ;) When you don't have a hidden register in the
> > CPU you're screwed.
> > [x86-64 has one btw]
> I dont actually know a CPU that doesnt have one in SMP mode. Its just often
> behind an I/O interface that is slower than ideal

Where would you put it for IA32 ? I don't know any free MSR that could
be abused for that, and acessing MSRs is insanely slow anyways. Any
other ideas ?

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