From mboxrd@z Thu Jan 1 00:00:00 1970 Received: with ECARTIS (v1.0.0; list linux-mips); Mon, 01 Feb 2010 16:04:25 +0100 (CET) Received: from kuber.nabble.com ([216.139.236.158]:35857 "EHLO kuber.nabble.com" rhost-flags-OK-OK-OK-OK) by eddie.linux-mips.org with ESMTP id S1492406Ab0BAPEV (ORCPT ); Mon, 1 Feb 2010 16:04:21 +0100 Received: from isper.nabble.com ([192.168.236.156]) by kuber.nabble.com with esmtp (Exim 4.63) (envelope-from ) id 1Nbxp3-0003ol-Gs for linux-mips@linux-mips.org; Mon, 01 Feb 2010 07:04:17 -0800 Message-ID: <27405624.post@talk.nabble.com> Date: Mon, 1 Feb 2010 07:04:17 -0800 (PST) From: Guenter Roeck To: linux-mips@linux-mips.org Subject: Re: Kernel crash in 2.6.32.6 / bcm1480 with 16k page size In-Reply-To: <20100201021854.GA8572@linux-mips.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Nabble-From: public@roeck-us.net References: <20100128155514.GA31611@ericsson.com> <20100129132406.GD5685@linux-mips.org> <20100129151220.GA3882@ericsson.com> <4B6316D2.1060006@caviumnetworks.com> <20100129180619.GA20113@linux-mips.org> <20100129183926.GB9895@ericsson.com> <4B632F60.4000604@caviumnetworks.com> <20100129192532.GA11123@ericsson.com> <4B6336F1.8070208@caviumnetworks.com> <20100129195801.GC11123@ericsson.com> <20100131165503.GA18523@ericsson.com> <20100201021854.GA8572@linux-mips.org> Return-Path: X-Envelope-To: <"|/home/ecartis/ecartis -s linux-mips"> (uid 0) X-Orcpt: rfc822;linux-mips@linux-mips.org Original-Recipient: rfc822;linux-mips@linux-mips.org X-archive-position: 25813 X-ecartis-version: Ecartis v1.0.0 Sender: linux-mips-bounce@linux-mips.org Errors-to: linux-mips-bounce@linux-mips.org X-original-sender: public@roeck-us.net Precedence: bulk X-list: linux-mips Ralf Baechle DL5RB wrote: > > On Sun, Jan 31, 2010 at 08:55:03AM -0800, Guenter Roeck wrote: > >> > The size of the address space can be probed via CP0 registers (for >> MIPS >> > architecture processors that is). No need to add any CPU dependencies >> > (except from legacy 64-bit MIPS processors perhaps). >> > >> That would help. Do you happen to know which CP0 register(s) to look for >> ? >> I browsed through the MIPS 5K and 20Kc manuals, but didn't find it. > > Write a value with all bits set to c0_entryhi, then read it back again. > The set bits in the VPN2 bitfield will indicate the size of the virtual > address range supported. The MIPS64 documentation also calls this value > SEGBITS. The nice thing about this probe is that it is supported for > all 64-bit MIPS processors except the R8000 which has an entirely > different > TLB scheme anyway. > > Similarly it is possible to probe the physical address range in either > c0_entrylo0 or c0_entrylo1. This is also of interest on 32-bit > processors. > > Ralf > > > Ok, I'll try that and submit a new set of patches if it works. Guenter -- View this message in context: http://old.nabble.com/Kernel-crash-in-2.6.32.6---bcm1480-with-16k-page-size-tp27358179p27405624.html Sent from the linux-mips main mailing list archive at Nabble.com.