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From: Grant Grundler <grundler@parisc-linux.org>
To: Joel Soete <soete.joel@tiscali.be>
Cc: parisc-linux@parisc-linux.org
Subject: Re: [parisc-linux] Space registers and how to use them
Date: Sun, 25 Sep 2005 11:35:13 -0600	[thread overview]
Message-ID: <20050925173513.GA22786@colo.lackof.org> (raw)
In-Reply-To: <43367383.6030307@tiscali.be>

On Sun, Sep 25, 2005 at 09:53:07AM +0000, Joel Soete wrote:
> Btw can you help me to undurstand the concept of the 4 quadrants as it was 
> spoken in:
> <http://lists.parisc-linux.org/pipermail/parisc-linux/2002-December/018602.html>

A "quadrant" is 1GB of address space. Think of each 1GB of address space
in 4GB as a "quadrant".

> Used in hpux? (documented somewhere?)

Probably.

> Is it related to the usage of sr4-7 as 4 different kernel spaces?

Yes. "2 bit s" field in fdc/fic map each "quadrant" to sr4-7.
ie 0-1GB uses sr4, 1-2GB uses sr5, etc.

John was just saying it doesn't matter since parisc-linux uses
the same value in all four (sr4-7) space registers.

grant
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  parent reply	other threads:[~2005-09-25 17:35 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-09-25  3:43 [parisc-linux] Space registers and how to use them Matthew Wilcox
     [not found] ` <43367383.6030307@tiscali.be>
2005-09-25 17:35   ` Grant Grundler [this message]
2005-09-25 18:03     ` John David Anglin
2005-10-06  4:59       ` Grant Grundler
2005-09-25 17:43 ` John David Anglin
2005-09-25 18:17   ` Matthew Wilcox

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