From: Grant Grundler <grundler@parisc-linux.org>
To: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: John David Anglin <dave@hiauly1.hia.nrc.ca>,
Grant Grundler <grundler@parisc-linux.org>,
artem.alimarine@stromasys.com, linux-parisc@vger.kernel.org
Subject: Re: Wierd code in Entry.S
Date: Wed, 15 Jul 2009 00:38:00 -0600 [thread overview]
Message-ID: <20090715063800.GA26739@lackof.org> (raw)
In-Reply-To: <1247242701.3936.28.camel@mulgrave.site>
On Fri, Jul 10, 2009 at 11:18:21AM -0500, James Bottomley wrote:
> On Fri, 2009-07-10 at 11:55 -0400, John David Anglin wrote:
...
> > Your comment would explain why I
> > don't see this on c3750. Could this affect PA8700?
>
> In theory it would affect every box running a 64 bit kernel.
Yes, regarding corrupting bit-44 but not U-bit.
IIRC, only pa880 and pa8900 pay attention to the U-bit.
I thought all the previous CPUs ignored U-bit.
> We
> actually set PAGE_NO_CACHE on ioremaps(), so it's spreading out from the
> PCI device space.
Yes - but only ZX1 chipset (e.g. rp3440 and C8000) uses IO space that
is outside of F-space. F-space is hardwired to be uncachable by the CPU.
hth,
grant
next prev parent reply other threads:[~2009-07-15 6:38 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-07-09 13:11 Wierd code in Entry.S Artem Alimarine
2009-07-09 22:55 ` Grant Grundler
2009-07-10 0:15 ` John David Anglin
2009-07-10 15:36 ` Grant Grundler
2009-07-10 15:55 ` John David Anglin
2009-07-10 16:18 ` James Bottomley
2009-07-10 18:48 ` John David Anglin
2009-07-15 6:38 ` Grant Grundler [this message]
2009-07-15 12:41 ` James Bottomley
2009-07-15 15:00 ` Matthew Wilcox
2009-07-22 5:34 ` Grant Grundler
2009-07-10 16:11 ` Artem Alimarine
2009-07-15 6:40 ` Grant Grundler
2009-07-10 15:52 ` James Bottomley
2009-07-10 16:25 ` Artem Alimarine
2009-07-11 0:12 ` John David Anglin
2009-07-11 0:30 ` John David Anglin
2009-07-11 1:05 ` John David Anglin
2009-07-12 19:40 ` John David Anglin
2009-07-13 1:15 ` Kyle McMartin
2009-07-13 1:44 ` John David Anglin
2009-07-13 1:54 ` Kyle McMartin
2009-07-13 2:18 ` John David Anglin
2009-07-10 7:31 ` Artem Alimarine
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