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Re: VCEI/VCED handling

To: Thomas Bogendoerfer <tsbogend@alpha.franken.de>, linux@cthulhu.engr.sgi.com
Subject: Re: VCEI/VCED handling
From: ralf@uni-koblenz.de
Date: Tue, 29 Sep 1998 01:50:03 +0200
In-reply-to: <19980929011414.43485@alpha.franken.de>; from Thomas Bogendoerfer on Tue, Sep 29, 1998 at 01:14:14AM +0200
References: <19980929011414.43485@alpha.franken.de>
Sender: owner-linux@cthulhu.engr.sgi.com
On Tue, Sep 29, 1998 at 01:14:14AM +0200, Thomas Bogendoerfer wrote:

> Yesterday I studied the MIPS user's manual to find out, what has to be
> done for the virtual cache coherency exceptions. Before I start to write
> some code, I want make sure, that I got it right.
> 
> VCEI:
>       Hit Set Virtual on BadVaddr
> 
> VCED: 
>       Hit Invalidate BadVaddr
>       TLB Lookup for BadVaddr
>       Physical Address -> Index
>       Index Load Tag
>       Extract PIdx from TagLo
>       Construct Vaddr from BadVaddr and PIdx
>       Hit Write Back on created Vaddr
>       Hit Set Virtual on BadVaddr
> 
> Comments ?

We've got code of which we're shure that it is correct.  Nevertheless
Linux ist still fragile on SC machines.  I've been tracking this in
private emails with Ulf but so far only with limited success.  Aside of
the missing VCED / VCEI handlers there must be something else that is
broken.

  Ralf

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