Date: Wed, 22 Nov 2000 07:51:35 +0000 (GMT) From: Doug Rabson <dfr@nlsystems.com> To: Jake Burkholder <jburkhol@home.com> Cc: John Baldwin <jhb@freebsd.org>, Daniel Eischen <eischen@vigrid.com>, Jonathan Lemon <jlemon@flugsvamp.com>, arch@freebsd.org Subject: Re: Thread-specific data and KSEs Message-ID: <Pine.BSF.4.21.0011220748390.247-100000@salmon.nlsystems.com> In-Reply-To: <20001122015756.AF470BA7A@io.yi.org>
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On Tue, 21 Nov 2000, Jake Burkholder wrote:
> > Well, %gs would cover x86 and k64. I think ia64 has several application
> > registers that are available for OS use and we could steal one of those. I'm
> > not sure about the alpha though.
> >
>
> Doug uses $8 (t7) on the alpha for the per-cpu data pointer, and r13
> on ia64. Not that that means anything to me.
>
> alpha/inclue/globals.h:
>
> register struct globaldata *globalp __asm__("$8");
>
> ia64/include/globals.h:
>
> register struct globaldata *globalp __asm__("r13");
>
> Its not really relevant if they're the same in and out of the kernel
> cause the memory isn't addressable in both places anyway.
For alpha in user mode, we should use the 'process unique value' which is
accessable with 'call_pal PAL_rdunique' and 'call_pal PAL_wrunique'. In
kernel mode, just stick something in the pcpu structure probably.
--
Doug Rabson Mail: dfr@nlsystems.com
Phone: +44 20 8348 6160
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