linux-kernel - Re: [patch] pci: revert "PCI: remove transparent bridge sizing"

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 26 Mar 2008 23:30:41 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ivan Kokshaysky <ink@...assic.park.msu.ru>,
	Gary Hade <garyhade@...ibm.com>,
	Thomas Meyer <thomas@...3r.de>,
	Stefan Richter <stefanr@...6.in-berlin.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	LKML <linux-kernel@...r.kernel.org>,
	Adrian Bunk <bunk@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Natalie Protasevich <protasnb@...il.com>, pm@...ian.org
Subject: Re: [patch] pci: revert "PCI: remove transparent bridge sizing"


* Ingo Molnar <mingo@...e.hu> wrote:

> > PCI bridges at zero is perfectly valid indeed and I'm sure we have 
> > that around at least for IO space. In fact, I'm surprised you don't 
> > have that on x86. Typically, things like an HT segment with a P2P 
> > bridge and behind that bridge an ISA bridge could well have the P2P 
> > bridge with a resource forwarding 0...0x1000 IO downstream for 
> > example even on x86 no ? (I'm not -that- familiar with the crazyness 
> > of legacy ISA on x86 but I've definitely seen such setup on other 
> > archs).
> 
> 0..0x1000 physical memory (== bus memory on x86) is reserved to the 
> BIOS as RAM in essence and that legacy will be with us for at least 
> 100 or maybe 200 years ;-)

ah i was fixated on ioremap-ed memory resources - the PIO space is quite 
colorful indeed.

	Ingo
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/