68030 CPU cache

["David Ross" <dross%pobox.com@localhost>]

Random question...
In the Atari OS (TOS) for the TT030 there's a way to view/set the state of 
the 68030 cache.  I've been curious to find out if the CPU cache is enabled 
when I'm in NetBSD.  Anyone know, or know a quick way to to get the info at 
runtime w/o learning 68030 assembler?  =)

David Ross
dross%pobox.com@localhost


----- Original Message ----- 
From: "Ignatios Souvatzis" <is%netbsd.org@localhost>
To: <port-atari%netbsd.org@localhost>; <port-amiga%netbsd.org@localhost>
Sent: Sunday, January 18, 2009 11:05 PM
Subject: Re: gcc -m68060 option in kernel Makefiles


> Hello,
>
> On Sun, Jan 18, 2009 at 05:45:42PM +0000, David Brownlee wrote:
>
> > I though the 040 added Move16? Whether or not thats useful in kernel or
> > even used by gcc is another matter...
>
> Yes, 68040 and 68060 have MOVE16. We use them in the kernel's memcpy
> for large blocks, I think, depending on CPU, but I hope they're not
> directly used by gcc - they hook into the cache line write pipeline,
> so effectively block normal writes why they execute. I don't know by
> heart how they're ordered with respect to normal reads and writes.
>
> Regards,
> -is
> --
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