Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262580AbVBBRph (ORCPT ); Wed, 2 Feb 2005 12:45:37 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262415AbVBBRpe (ORCPT ); Wed, 2 Feb 2005 12:45:34 -0500 Received: from pat.uio.no ([129.240.130.16]:41173 "EHLO pat.uio.no") by vger.kernel.org with ESMTP id S262376AbVBBRpS (ORCPT ); Wed, 2 Feb 2005 12:45:18 -0500 Date: Wed, 2 Feb 2005 18:45:09 +0100 From: Haakon Riiser To: Linux kernel Subject: Re: Accelerated frame buffer functions Message-ID: <20050202174509.GA773@s> Mail-Followup-To: Linux kernel References: <20050202133108.GA2410@s> <20050202142155.GA2764@s> <1107357093.6191.53.camel@gonzales> <20050202154139.GA3267@s> <9e4733910502020825434a477@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <9e4733910502020825434a477@mail.gmail.com> User-Agent: Mutt/1.5.6i X-MailScanner-Information: This message has been scanned for viruses/spam. Contact postmaster@uio.no if you have questions about this scanning X-UiO-MailScanner: No virus found X-UiO-Spam-info: not spam, SpamAssassin (score=0.05, required 12, autolearn=disabled, FORGED_RCVD_HELO 0.05) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1965 Lines: 40 [Jon Smirl] > On Wed, 2 Feb 2005 16:41:39 +0100, Haakon Riiser > wrote: >> Thanks for the tip, I hadn't heard about it. I will take a look, >> but only to see if it can show me the user space API of /dev/fb. >> I don't need a general library that supports a bunch of different >> graphics cards. I'm writing my own frame buffer driver for the >> GX2 CPU, and I just want to know how to call the various functions >> registered in struct fb_ops, so that I can test my code. I mean, >> all those functions registered in fb_ops must be accessible >> somehow; if they weren't, what purpose would they serve? > > You should look at writing a DRM driver. DRM implements the kernel > interface to get 3D hardware running. It is a fully accelerated driver > interface. They are located in drivers/char/drm Have the standard frame buffer drivers been abandoned, even for devices that have no 3D acceleration (like the Geode GX2)? I took a quick look at the DRM stuff, and it looked like extreme overkill for what I need, if it even can be used for what I want to do. At first glance it looked like this is only relevant for OpenGL/X11 3D-stuff, which I have absolutely no use for. GX2 is an integrated CPU/graphics chip for embedded systems. We have third party applications that use the framebuffer device, and I was hoping to make things faster by writing an accelerated driver. The only thing I need answered is how to access fb_ops from userspace. If that is impossible because all the framebuffer code is leftover junk that no one uses anymore, or even /can/ use anymore because the userspace interface is gone, please let me know now so I don't have to waste any more time. -- Haakon - 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/