From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on inbox.vuxu.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=5.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,RCVD_IN_DNSWL_NONE autolearn=ham autolearn_force=no version=3.4.2 Received: from minnie.tuhs.org (minnie.tuhs.org [45.79.103.53]) by inbox.vuxu.org (OpenSMTPD) with ESMTP id 1c7a77cf for ; Tue, 21 Jan 2020 17:26:11 +0000 (UTC) Received: by minnie.tuhs.org (Postfix, from userid 112) id 890589C154; Wed, 22 Jan 2020 03:26:09 +1000 (AEST) Received: from minnie.tuhs.org (localhost [127.0.0.1]) by minnie.tuhs.org (Postfix) with ESMTP id E398A9BFE6; Wed, 22 Jan 2020 03:25:44 +1000 (AEST) Received: by minnie.tuhs.org (Postfix, from userid 112) id DDA4D9BFE6; Wed, 22 Jan 2020 03:25:41 +1000 (AEST) Received: from fourwinds.com (fourwinds.com [63.64.179.162]) by minnie.tuhs.org (Postfix) with ESMTPS id D2E549BFE5 for ; Wed, 22 Jan 2020 03:25:37 +1000 (AEST) Received: from darkstar.fourwinds.com (localhost [127.0.0.1]) by fourwinds.com (8.15.2/8.15.2) with ESMTPS id 00LHPYZq3282467 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NOT) for ; Tue, 21 Jan 2020 09:25:34 -0800 Received: from darkstar.fourwinds.com (jon@localhost) by darkstar.fourwinds.com (8.15.2/8.15.2/Submit) with ESMTP id 00LHPYOO3282464 for ; Tue, 21 Jan 2020 09:25:34 -0800 Message-Id: <202001211725.00LHPYOO3282464@darkstar.fourwinds.com> From: Jon Steinhart To: The Unix Heritage Society mailing list In-reply-to: References: <20200117195908.GF15253@ancienthardware.org> <20200118035051.GC481935@mit.edu> <20200118041913.GB67053@eureka.lemis.com> <20200119024900.GA15860@mit.edu> <20200119031225.GI67053@eureka.lemis.com> <20200119035808.GK67053@eureka.lemis.com> <20200119132551.GC15860@mit.edu> <20200120180432.GJ28686@mcvoy.com> <202001201946.00KJk5er3071186@darkstar.fourwinds.com> <7wk15l70u3.fsf@junk.nocrew.org> <202001211717.00LHHaxP3280983@darkstar.fourwinds.com> Comments: In-reply-to Warner Losh message dated "Tue, 21 Jan 2020 10:22:38 -0700." MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-ID: <3282462.1579627534.1@darkstar.fourwinds.com> Date: Tue, 21 Jan 2020 09:25:34 -0800 X-JON-SPAM: local delivery Subject: Re: [TUHS] Early Linux and BSD X-BeenThere: tuhs@minnie.tuhs.org X-Mailman-Version: 2.1.26 Precedence: list List-Id: The Unix Heritage Society mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: tuhs-bounces@minnie.tuhs.org Sender: "TUHS" Warner Losh writes: > > On Tue, Jan 21, 2020, 10:18 AM Jon Steinhart wrote: > > > Lars Brinkhoff writes: > > > Jon Steinhart wrote: > > > > The 32032 made sense for the workstation division based on the data > > sheets. > > > > But, it turned out to be extremely buggy, and unlike the 68K I don't > > recall > > > > the ability to look at and patch the state of the microcode. > > > > > > Did you have the ability to look at and patch the state of 68000 > > > microcode? How? > > > > My memory is very very very fuzzy on this. I seem to recall that microcode > > state was pushed onto a stack in certain cases, and that it was possible to > > fix some problems there for certain weird cases relating to memory > > management. > > That's all that I remember about it as that's not the part of things that I > > was working on, just heard grumbles from other folks about it. > > > > This isn't for the two cpu design to allow instructions to be restarted > after a page fault. > > Warner > > Jon No, this was using a 68020 with the PMMU.