Date: Wed, 15 Sep 2010 08:01:24 +0900 From: Taku YAMAMOTO <taku@tackymt.homeip.net> To: Andriy Gapon <avg@freebsd.org> Cc: Alexander Motin <mav@freebsd.org>, freebsd-acpi@freebsd.org Subject: Re: CPU C-state storange on Panasonic TOUGH BOOK CF-R9 Message-ID: <20100915080124.c6d53391.taku@tackymt.homeip.net> In-Reply-To: <4C8F35FD.2090603@freebsd.org> References: <4C8BCAC5.5050008@root.org> <mailpost.1284277196.1767764.83548.mailing.freebsd.current@FreeBSD.cs.nctu.edu.tw> <4C8C8B64.8020907@FreeBSD.org> <20100912182625.c49d3f1d.nork@FreeBSD.org> <4C8C9F06.4090505@icyb.net.ua> <20100912190537.621e357e.nork@FreeBSD.org> <20100912190952.8c0d5726.nork@FreeBSD.org> <20100912192518.e791c191.nork@FreeBSD.org> <4C8CAC01.70004@icyb.net.ua> <4C8CAD7D.50602@FreeBSD.org> <4C8CF03F.1050902@icyb.net.ua> <4C8CF412.9080601@icyb.net.ua> <4C8CF91A.4040804@FreeBSD.org> <4C8E5A5D.6000303@icyb.net.ua> <4C8F35FD.2090603@freebsd.org>
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This is a multi-part message in MIME format. --Multipart=_Wed__15_Sep_2010_08_01_24_+0900_YduQ=5Ge2cFM+HD5 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Tue, 14 Sep 2010 11:44:45 +0300 Andriy Gapon <avg@freebsd.org> wrote: > Additionally, it seems that we do not currently have any support for Functional > Fixed Hardware (FFH) way of providing C states. In this case _CST returns GAS > of a register used to enter a C state with address space ID set to > ACPI_ADR_SPACE_FIXED_HARDWARE (0x7f/127). Such addresses should be handled in a > special way: > ftp://download.intel.com/technology/IAPC/acpi/downloads/30222305.pdf > > Currently we simply (and silently) ignore such _CST entries. > I think that this should be useful (if not necessary) with mwait. I have a proof-of-concept, quick'n'dirty patch against pre-r212541 to utilize FFH _CST. Unfortunately I have no time to catch up the latest and fantastic work by mav, though. -- -|-__ YAMAMOTO, Taku | __ < <taku@tackymt.homeip.net> - A chicken is an egg's way of producing more eggs. - --Multipart=_Wed__15_Sep_2010_08_01_24_+0900_YduQ=5Ge2cFM+HD5--
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