Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262144AbVCJG7N (ORCPT ); Thu, 10 Mar 2005 01:59:13 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262064AbVCJG7N (ORCPT ); Thu, 10 Mar 2005 01:59:13 -0500 Received: from ebiederm.dsl.xmission.com ([166.70.28.69]:40673 "EHLO ebiederm.dsl.xmission.com") by vger.kernel.org with ESMTP id S262144AbVCJG7I (ORCPT ); Thu, 10 Mar 2005 01:59:08 -0500 To: Vivek Goyal Cc: Andrew Morton , gdb , Dave Anderson , lkml , fastboot Subject: Re: [Fastboot] Re: Query: Kdump: Core Image ELF Format References: <1110286210.4195.27.camel@wks126478wss.in.ibm.com> <1110350629.31878.7.camel@wks126478wss.in.ibm.com> <1110430955.3574.11.camel@wks126478wss.in.ibm.com> From: ebiederm@xmission.com (Eric W. Biederman) Date: 09 Mar 2005 23:56:04 -0700 In-Reply-To: <1110430955.3574.11.camel@wks126478wss.in.ibm.com> Message-ID: User-Agent: Gnus/5.0808 (Gnus v5.8.8) Emacs/21.2 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1360 Lines: 25 Vivek Goyal writes: > I want to fill the virtual addresses of linearly mapped region. That is > physical addresses from 0 to MAXMEM (896 MB) are mapped by kernel at > virtual addresses PAGE_OFFSET to (PAGE_OFFSET + MAXMEM). Values of > PAGE_OFFSET and MAXMEM are already known and hard-coded. PAGE_OFFSET has a common value of 0xc0000000, on x86. However that value is by no means fixed. The 4G/4G split changes it as do some other patches floating around at the time. On x86-64 I don't know how stable those kinds of offsets are. > I think I used the terminology kernel virtual address and that is adding > to the confusion. Kernel virtual addresses are not necessarily linearly > mapped. What I meant was kernel logical addresses whose associated > physical addresses differ only by a constant offset. I know what you meant. I simply meant that things don't look that constant to me. Especially in Linux where there are enough people to try most of the reasonable possibilities. I don't even think it is a bad idea. But I do think we have a different idea of what is constant. Eric - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/