From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from terminus.zytor.com ([198.137.202.10] helo=mail.zytor.com) by bombadil.infradead.org with esmtps (Exim 4.72 #1 (Red Hat Linux)) id 1OjMsT-0001Vl-SC for kexec@lists.infradead.org; Thu, 12 Aug 2010 01:46:43 +0000 Message-ID: <4C635268.1030709@zytor.com> Date: Wed, 11 Aug 2010 18:46:16 -0700 From: "H. Peter Anvin" MIME-Version: 1.0 Subject: Re: Question regardin intel64 arch and page table setup References: <20100811194734.GD23317@hmsreliant.think-freely.org> <4C6301C2.5020808@zytor.com> <20100812010506.GB2258@localhost.localdomain> In-Reply-To: <20100812010506.GB2258@localhost.localdomain> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: kexec-bounces@lists.infradead.org Errors-To: kexec-bounces+dwmw2=infradead.org@lists.infradead.org To: Neil Horman Cc: kexec@lists.infradead.org, ebiederm@xmission.com, Neil Horman On 08/11/2010 06:05 PM, Neil Horman wrote: > > Thanks for all the info, guys. I hadn't considered that we couldn't access the > 64 bit startup point for the bzImage. I just figured we could jump to > startup_32 + 0x200 in the bzImage header once I had the page table bit set up > properly. > > I hadn't considered the problems we might encounter with driver issues loading > above 4gb and what have you, nor the starting of AP's. > > Regardless, I'll keep tinkering. One more question. When setting up the page > table in the panic boot case, is it sufficient to setup an identity map for the > pages in the reserved crashkernel range, or do we need to identity map the > entire range of ram? > Not clear to me. Probably the former, but you might find problems. Another issue: if you are planning to run SMP, the AP trampoline needs low memory, too. -hpa -- H. Peter Anvin, Intel Open Source Technology Center I work for Intel. I don't speak on their behalf. _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec