Date: Wed, 24 May 2000 17:30:35 +0200 (EET) From: Narvi <narvi@haldjas.folklore.ee> To: Kazutaka YOKOTA <yokota@zodiac.mech.utsunomiya-u.ac.jp> Cc: Chuck Paterson <cp@bsdi.com>, arch@FreeBSD.ORG Subject: Re: Preemptive kernel on older X86 hardware Message-ID: <Pine.BSF.3.96.1000524171542.95256U-100000@haldjas.folklore.ee> In-Reply-To: <200005241519.AAA20525@zodiac.mech.utsunomiya-u.ac.jp>
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On Thu, 25 May 2000, Kazutaka YOKOTA wrote: > [...] > >Neither the 386 nor the 486 have a processor priority register or > >cycle counters. Currently the BSD/OS SMPng kernel requires both of > >these. There already exists some left over code to deal with not > >having a cycle counter. Doing a casual inspection there really > >doesn't seem to be anything too ugly in making the system run > >without these when there is only a single processor. > > 386 and 486 do not support multi-processor configuration, don't they? > They do in principle, but the fact can be overlooked. But loosing the ability to run on x86, x<5 is catastrophic. > Kazu > Sander sander@haldjas.folklore.ee To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message
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