Date: Mon, 11 Nov 2002 01:26:25 +0900 (JST) From: Mitsuru IWASAKI <iwasaki@jp.FreeBSD.org> To: dschultz@uclink.Berkeley.EDU Cc: arg-bsd@arg1.demon.co.uk, stable@FreeBSD.ORG, current@FreeBSD.ORG, david@uky.edu, sidcarter@symonds.net Subject: Re: machdep.c problem Message-ID: <20021111.012625.74757276.iwasaki@jp.FreeBSD.org> In-Reply-To: <20021110124354.GA2292@HAL9000.homeunix.com> References: <20021108234404.L22249-100000@server.arg.sj.co.uk> <20021110.050300.98560281.iwasaki@jp.FreeBSD.org> <20021110124354.GA2292@HAL9000.homeunix.com>
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Hi, > Thus spake Mitsuru IWASAKI <iwasaki@jp.FreeBSD.org>: > > OK, it seems to be difficult to determine the region for any BIOSes. > > I've decided to introduce a new loader tunable to indicate that BIOS > > has broken int 12H. Attached patch back out 1.385.2.26 changes to > > support older BIOSes, and add support for broken int 12 BIOSes by > > new loader tunable. > > I don't think this is the best solution, but it is probably good for > > all people for now. > > I'll make the equivalent patches for CURRENT and commit them, > > then MFC soon. > > Sorry for inconvenience, folks. > > This approach is okay with me in the sense that it doesn't break > anything that wasn't already broken, but as you say, I think we > can do better. Below is a patch that merely extracts the basemem > size from the bootinfo structure for the purposes of mapping the > EBDA. I retained the int 12h fallback just to be safe, but I > think the bootinfo structure is initialized with a valid basemem > for all loaders since at least 1998. (Maybe the fallbacks in the > kernel should be removed entirely to avoid redundancy, or moved > from loader and boot2 to locore.s.) Yes, this idea was in my first patch actually, and this was not good solution as Bruce explained. Please see the archive at: http://docs.freebsd.org/cgi/getmsg.cgi?fetch=94412+0+archive/2002/freebsd-current/20021006.freebsd-current I think that this is not so easy problem, we need to re-design memory size detection code carefully considering PAE support in future. This will take time, so the patch I committed into CURRENT last night is reasonable for the time being, I think. Thanks To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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