From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailman by lists.gnu.org with archive (Exim 4.43) id 1JKV7b-0007JP-IA for mharc-grub-devel@gnu.org; Thu, 31 Jan 2008 03:50:11 -0500 Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1JKV7W-0007JD-IO for grub-devel@gnu.org; Thu, 31 Jan 2008 03:50:06 -0500 Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1JKV7T-0007Iv-UY for grub-devel@gnu.org; Thu, 31 Jan 2008 03:50:05 -0500 Received: from [199.232.76.173] (helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1JKV7S-0007Io-MR for grub-devel@gnu.org; Thu, 31 Jan 2008 03:50:02 -0500 Received: from smtp-vbr14.xs4all.nl ([194.109.24.34]) by monty-python.gnu.org with esmtp (Exim 4.60) (envelope-from ) id 1JKV7S-0005gZ-EB for grub-devel@gnu.org; Thu, 31 Jan 2008 03:50:02 -0500 Received: from localhost.localdomain (249-174.surfsnel.dsl.internl.net [145.99.174.249]) by smtp-vbr14.xs4all.nl (8.13.8/8.13.8) with ESMTP id m0V8o0f5047194 for ; Thu, 31 Jan 2008 09:50:01 +0100 (CET) (envelope-from mgerards@xs4all.nl) From: Marco Gerards To: The development of GRUB 2 References: <87prvmm4i2.fsf@xs4all.nl> <87y7a7i4bx.fsf@xs4all.nl> <20080130184423.GB32727@thorin> <87prvjhy9p.fsf@xs4all.nl> <20080130220155.GA6731@thorin> <87lk67hsaa.fsf@xs4all.nl> <20080130222506.GA7679@thorin> Mail-Copies-To: mgerards@xs4all.nl Date: Thu, 31 Jan 2008 09:51:38 +0100 In-Reply-To: <20080130222506.GA7679@thorin> (Robert Millan's message of "Wed, 30 Jan 2008 23:25:06 +0100") Message-ID: <87d4riidid.fsf@xs4all.nl> User-Agent: Gnus/5.110006 (No Gnus v0.6) Emacs/21.4 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Virus-Scanned: by XS4ALL Virus Scanner X-detected-kernel: by monty-python.gnu.org: FreeBSD 4.6-4.9 Subject: Re: PCI support X-BeenThere: grub-devel@gnu.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: The development of GRUB 2 List-Id: The development of GRUB 2 List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 31 Jan 2008 08:50:07 -0000 Robert Millan writes: > On Wed, Jan 30, 2008 at 11:17:49PM +0100, Marco Gerards wrote: >> >> IO addresses are Intel only, AFAIK. Almost all architectures have >> >> mmapped IO. It's really arch specific. >> > >> > Are you sure that makes grub_inl / grub_outl arch-specific ? They can't be >> > implemented as wrappers for direct memory access? >> >> No, AFAIK that is not possible. However, PCI gives you the mmapped IO >> addresses we can use, for example for the ATA driver. > > Why not? > > What's wrong with: > > grub_uint32_t > grub_inl (grub_uint32_t *addr) > { > return *addr; > } Nothing, except the missing volatile I guess. This just isn't an IO port. So you can't use IO port 0x60 to access the keyboard or so. But sure, we need an abstraction. -- Marco