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=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,HTML_MESSAGE,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 1272acec for ; Tue, 21 Jan 2020 17:23:27 +0000 (UTC) Received: by minnie.tuhs.org (Postfix, from userid 112) id 7BCF39C143; Wed, 22 Jan 2020 03:23:26 +1000 (AEST) Received: from minnie.tuhs.org (localhost [127.0.0.1]) by minnie.tuhs.org (Postfix) with ESMTP id 965499BFE6; Wed, 22 Jan 2020 03:22:56 +1000 (AEST) Authentication-Results: minnie.tuhs.org; dkim=pass (2048-bit key; unprotected) header.d=bsdimp-com.20150623.gappssmtp.com header.i=@bsdimp-com.20150623.gappssmtp.com header.b="GjkWJmjP"; dkim-atps=neutral Received: by minnie.tuhs.org (Postfix, from userid 112) id D30569BFE6; Wed, 22 Jan 2020 03:22:54 +1000 (AEST) Received: from mail-qt1-f179.google.com (mail-qt1-f179.google.com [209.85.160.179]) by minnie.tuhs.org (Postfix) with ESMTPS id 17B889BFE5 for ; Wed, 22 Jan 2020 03:22:51 +1000 (AEST) Received: by mail-qt1-f179.google.com with SMTP id k40so3234446qtk.8 for ; Tue, 21 Jan 2020 09:22:51 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bsdimp-com.20150623.gappssmtp.com; s=20150623; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=8qaNQkXR+dkKgJsUSo/tEEFy8q6cqD6qnpdP7o4nhvY=; b=GjkWJmjPyKGoShrkuexyTBjZB0mZUqiLdxWGAGzdrUdoRsJLUcd9CSiS46VAb5SkSf iqSWXUZwnjvB2hTsgFGOjDgBJ1Gv5LnOIaQBgeh3CkVnAU+x97anMUugpTlS1vvCtREW RqvlCF43mphZQ1TcWTlDeN55VlTS792uhl0myKckUcdCn5NcT6HeIPN6v/k5Wj//A+/s EgdCTby3Xh+iBoW1Fw8QKoUiFOdn8q9lUsX+QAZel7A3qZZa1a0+RaYIJfqVwvb1fHlX j9xrgRj/F42HbpoxMax9D/fa8eTOGAwI82WdlA6kq0sBUaXWprT/W5xztvp4WxkUOSVN gcEw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=8qaNQkXR+dkKgJsUSo/tEEFy8q6cqD6qnpdP7o4nhvY=; b=ABaB5FNsZPtH3nt/3/3BhW5mgSlzyr7UKZuybZ3QgSynEcIygXSIERRPbNB7AhE0Sh wbTU5qLtP4hpL9BYL+34zFpe6X2yUt9FLmETdvXvTPWrLo6JB+0pf9T1EGz6/j5WE6oV wCDPNByTfUJTX7MaEpZAYD38cVlSLu4VoscSiRFPYQGbEIMeqgIn2j/bPYuIW4ycHXlm eIC/ZejTr0HuC0NFwztvyuZlW3zK8g2Lkeyqf7sYHB+rBFcXkhNG+plm9J+JvJMVzIeS UKvWdYShVtPw9KDHk6xDcER40SgqrYjqm9S2Uc4iR2N2e12GNx2gKNWrSsDOwfu/XKSM dK5Q== X-Gm-Message-State: APjAAAU57FDT8zGkVoi/Bqi1QRRetTT9cwTM7ToCqZ8lvg2gjfVpujjE /+QoAGKF4hFhjGw9YadDfz9B7vV1fxE20KzOuMqf57wK X-Google-Smtp-Source: APXvYqy/WbyJHQD6wTEfo0Vz7Zq5NMBVbxyAwpBc3CdsHmeILoULH1BPMGOjoQ4Jsn1v1Xt9vKPL/2dHYAAxP52naII= X-Received: by 2002:aed:3b79:: with SMTP id q54mr5604456qte.187.1579627370066; Tue, 21 Jan 2020 09:22:50 -0800 (PST) MIME-Version: 1.0 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> In-Reply-To: <202001211717.00LHHaxP3280983@darkstar.fourwinds.com> From: Warner Losh Date: Tue, 21 Jan 2020 10:22:38 -0700 Message-ID: To: Jon Steinhart Content-Type: multipart/alternative; boundary="00000000000045435e059ca9a869" 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: , Cc: The Unix Heritage Society mailing list Errors-To: tuhs-bounces@minnie.tuhs.org Sender: "TUHS" --00000000000045435e059ca9a869 Content-Type: text/plain; charset="UTF-8" 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 > --00000000000045435e059ca9a869 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


On Tue, Jan 21, 2020, 10:18 AM Jon Steinhart <jon@fourwinds.com> wrote:
<= blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px= #ccc solid;padding-left:1ex">Lars Brinkhoff writes:
> Jon Steinhart wrote:
> > The 32032 made sense for the workstation division based on the da= ta sheets.
> > But, it turned out to be extremely buggy, and unlike the 68K I do= n'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?=C2=A0 How?

My memory is very very very fuzzy on this.=C2=A0 I seem to recall that micr= ocode
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 manageme= nt.
That's all that I remember about it as that's not the part of thing= s 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
--00000000000045435e059ca9a869--