linux-kernel - Re: [RFC 0/4] dynamically allocate arch specific system vectors

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Message-ID: <20080912114638.GA2661@sgi.com>
Date:	Fri, 12 Sep 2008 06:46:38 -0500
From:	Dean Nelson <dcn@....com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Alan Mayer <ajm@....com>, Ingo Molnar <mingo@...e.hu>,
	jeremy@...p.org, rusty@...tcorp.com.au, suresh.b.siddha@...el.com,
	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Yinghai Lu <Yinghai.lu@....com>
Subject: Re: [RFC 0/4] dynamically allocate arch specific system vectors

On Thu, Sep 11, 2008 at 01:04:35PM -0700, H. Peter Anvin wrote:
> Dean Nelson wrote:
> >
> >We (SGI) need somewhere around eight vectors.
> >
> >There are two kernel modules, sgi-gru and sgi-xp (in drivers/misc), that
> >each need two vectors. And there's the broadcast assist unit (BAU) that is
> >involved in tlb shootdown on uv, which currently uses statically reserved
> >vector 0xf8 (UV_BAU_MESSAGE -- see uv_bau_init()). I know of a debugger 
> >that
> >also uses 0xf8 because it was previously available until UV_BAU_MESSAGE 
> >came
> >along. The BAU would be happy with a dynamically allocated system vector.
> >We have a couple of other things in the works that also need vectors.
> >
> >All of these eight or so vectors are only meaningful on SGI uv systems.
> >
> 
> Are these kernel-internal vectors, or exposed to userspace (i.e. the INT 
> instruction works in userspace)?  From what I'm gathering, I think this 
> is the former.

Yeah, these are kernel-internal vectors and are not exposed to userspace.
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