From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1JGNfR-0004ra-5Y for qemu-devel@nongnu.org; Sat, 19 Jan 2008 19:04:05 -0500 Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1JGNfP-0004qW-QB for qemu-devel@nongnu.org; Sat, 19 Jan 2008 19:04:04 -0500 Received: from [199.232.76.173] (helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1JGNfP-0004qG-D7 for qemu-devel@nongnu.org; Sat, 19 Jan 2008 19:04:03 -0500 Received: from wa-out-1112.google.com ([209.85.146.182]) by monty-python.gnu.org with esmtp (Exim 4.60) (envelope-from ) id 1JGNfO-0005YF-Tr for qemu-devel@nongnu.org; Sat, 19 Jan 2008 19:04:03 -0500 Received: by wa-out-1112.google.com with SMTP id k22so2867742waf.18 for ; Sat, 19 Jan 2008 16:03:56 -0800 (PST) Message-ID: Date: Sun, 20 Jan 2008 00:03:56 +0000 From: "William Pearson" MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline Subject: [Qemu-devel] Modding an Arch Reply-To: qemu-devel@nongnu.org List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org I'm hoping to do some research on a slightly odd form of resource allocation in an arch. Not sure which yet, hoping for some advise. My only real world assembler practice has been 68K (a while ago), but I have coded in my own assembler before on another homebrew very limited odd VM. I'm going to be changing these things, whilst keeping the rest constant, - how IRQs are assigned to handlers - how memory is protected - boot sequence - security levels - what the bios does when it finds devices - possibly adding a few instructions to the arch to facillitate the above - Paging in some fashion (might be removed) These will be added - security in interactions with a special persistant memory (hard disk alike) which will be what is booted - a device handled by the arch (rather than software) My goal is to get a demo that works up quickly-ish (a year or two while learning the arch, doing research and writing a very minimal demo OS probably in asm), but can also be extended nicely into a proper working system sometime down the line. I don't care about backwards compatibility. But easy porting tools across would be nice. So my questions are, 1) Is qemu a sensible thing to do this in. 2) If so which arch should I mod 3) What should I look at apart from stuff referenced in this thread http://lists.gnu.org/archive/html/qemu-devel/2005-12/msg00157.html Feel free to message me off-list if you want details of the arch, they are a bit raw still though, as I'm still in the process of figuring them out. Will Pearson