From owner-freebsd-arch Wed May 24 8:13:45 2000 Delivered-To: freebsd-arch@freebsd.org Received: from outmail.utsunomiya-u.ac.jp (outmail.utsunomiya-u.ac.jp [160.12.196.3]) by hub.freebsd.org (Postfix) with ESMTP id D62AB37BC74 for ; Wed, 24 May 2000 08:13:33 -0700 (PDT) (envelope-from yokota@zodiac.mech.utsunomiya-u.ac.jp) Received: from zodiac.mech.utsunomiya-u.ac.jp (IDENT:3H1romzcfWiPAHT4zBW6/lMAyahQm27O@zodiac.mech.utsunomiya-u.ac.jp [160.12.42.1]) by outmail.utsunomiya-u.ac.jp (8.9.3/3.7Wpl2) with ESMTP id AAA09895; Thu, 25 May 2000 00:13:17 +0900 (JST) Received: from zodiac.mech.utsunomiya-u.ac.jp (IDENT:8Gn3pliOSUYbClq0tzEU4osyo2qY3VhW@zodiac.mech.utsunomiya-u.ac.jp [160.12.42.1]) by zodiac.mech.utsunomiya-u.ac.jp (8.9.3+3.2W/3.7W/zodiac-May2000) with ESMTP id AAA20525; Thu, 25 May 2000 00:19:55 +0900 (JST) Message-Id: <200005241519.AAA20525@zodiac.mech.utsunomiya-u.ac.jp> To: Chuck Paterson Cc: arch@freebsd.org, yokota@zodiac.mech.utsunomiya-u.ac.jp Subject: Re: Preemptive kernel on older X86 hardware In-reply-to: Your message of "Wed, 24 May 2000 08:46:03 CST." <200005241446.IAA05589@berserker.bsdi.com> References: <200005241446.IAA05589@berserker.bsdi.com> Date: Thu, 25 May 2000 00:19:54 +0900 From: Kazutaka YOKOTA Sender: owner-freebsd-arch@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG [...] >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? Kazu To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message