From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailman by lists.gnu.org with archive (Exim 4.43) id 1KPw5v-00038l-C9 for mharc-grub-devel@gnu.org; Mon, 04 Aug 2008 05:11:11 -0400 Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1KPw5t-00038M-7i for grub-devel@gnu.org; Mon, 04 Aug 2008 05:11:09 -0400 Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1KPw5q-00037q-Vr for grub-devel@gnu.org; Mon, 04 Aug 2008 05:11:08 -0400 Received: from [199.232.76.173] (port=38152 helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1KPw5q-00037a-K8 for grub-devel@gnu.org; Mon, 04 Aug 2008 05:11:06 -0400 Received: from aybabtu.com ([69.60.117.155]:48486) by monty-python.gnu.org with esmtps (TLS-1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.60) (envelope-from ) id 1KPw5p-00058f-EK for grub-devel@gnu.org; Mon, 04 Aug 2008 05:11:06 -0400 Received: from [192.168.10.10] (helo=thorin) by aybabtu.com with esmtps (TLS-1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.69) (envelope-from ) id 1KPvyc-0005KL-Ki; Mon, 04 Aug 2008 11:03:39 +0200 Received: from rmh by thorin with local (Exim 4.63) (envelope-from ) id 1KPw4l-0000BY-En; Mon, 04 Aug 2008 11:09:59 +0200 Date: Mon, 4 Aug 2008 11:09:59 +0200 From: Robert Millan To: Colin D Bennett Message-ID: <20080804090959.GD32106@thorin> References: <20080623075438.5861e6d1@gibibit.com> <878wwi6bqy.fsf@xs4all.nl> <20080704112801.470827ea@gibibit.com> <87tzekiecu.fsf@xs4all.nl> <20080728100533.19118c0b@gibibit.com> <20080803194816.GA13744@thorin> <20080803235348.GA23220@thorin> <20080803191429.46c7d34e@gibibit.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20080803191429.46c7d34e@gibibit.com> Organization: free as in freedom X-Message-Flag: Worried about Outlook viruses? Switch to Thunderbird! www.mozilla.com/thunderbird X-Debbugs-No-Ack: true User-Agent: Mutt/1.5.13 (2006-08-11) X-detected-kernel: by monty-python.gnu.org: Genre and OS details not recognized. Cc: The development of GRUB 2 Subject: Re: TSC on coreboot (Re: [PATCH] High resolution time/TSC patch v3) 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: Mon, 04 Aug 2008 09:11:09 -0000 On Sun, Aug 03, 2008 at 07:14:29PM -0700, Colin D Bennett wrote: > > > > Note: AFAICT we can't calculate the epoch without RTC. But then > > again, this epoch is just as defined by the time BIOS enables RTC > > interrupts, so why not define it ourselves? I propose that we define > > epoch as the time in which our TSC code is initialized. > > > > If knowing the time in which BIOS was started is really useful, maybe > > we could #ifdef it instead. Though if it's not I'd prefer the > > simplicity. > > So far we never use the value returned by ``grub_get_time_ms()`` as an > absolute time. It is currently only used in relative terms, so only > the rate at which it changes is important, not the definition of the > zero point. Perhaps that simplifies things? I think it's fine to go > with that definition for now -- if we need to use absolute time at some > point, we can deal with it then. Hi Colin, As far as I'm concerned the combined patch can be committed, even without the cpuid harmonization I suggested (we can always arrange that later). If there's no objection I'll check it in. -- Robert Millan The DRM opt-in fallacy: "Your data belongs to us. We will decide when (and how) you may access your data; but nobody's threatening your freedom: we still allow you to remove your data and not access it at all."