From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on inbox.vuxu.org X-Spam-Level: X-Spam-Status: No, score=-0.6 required=5.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,HTML_MESSAGE,MAILING_LIST_MULTI, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.4 Received: from minnie.tuhs.org (minnie.tuhs.org [IPv6:2600:3c01:e000:146::1]) by inbox.vuxu.org (Postfix) with ESMTP id 625F023ED0 for ; Wed, 19 Jun 2024 09:49:12 +0200 (CEST) Received: from minnie.tuhs.org (localhost [IPv6:::1]) by minnie.tuhs.org (Postfix) with ESMTP id CB7D043646; Wed, 19 Jun 2024 17:49:11 +1000 (AEST) Received: from mail-pj1-x102b.google.com (mail-pj1-x102b.google.com [IPv6:2607:f8b0:4864:20::102b]) by minnie.tuhs.org (Postfix) with ESMTPS id 51285435E8 for ; Wed, 19 Jun 2024 17:49:08 +1000 (AEST) Received: by mail-pj1-x102b.google.com with SMTP id 98e67ed59e1d1-2c6e94131cfso1413559a91.3 for ; Wed, 19 Jun 2024 00:49:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bsdimp-com.20230601.gappssmtp.com; s=20230601; t=1718783347; x=1719388147; darn=tuhs.org; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:from:to:cc:subject:date:message-id:reply-to; bh=FRM5THfCRJplYUEolYfayyEEOVerrHZllYPP6TFy1kA=; b=IQy6UWF1BxpqxtLUzm2eIxAYvYWSDFN1lh88C20mkGsUby4U1oggZX1WZzj+KUP/p2 0CGxsu+ZW2rFycI0BowqLzxe9NEIv3MJEHmh/pHCR20Q2nv7faoyVgNfVFy4lTIzxBPT jp7U3pv+uvILo+6nvriYXNmkc7H2k1L8pjtsK/TMmi00RvghJMP0WiXJkJXwI7rLJPsE Kh87BcOUTkaqivvJKsCuDmq8Jje+LAEibK4lhegeTeZg9Of/LgEEq7LzVMcwJTK8pII/ WAR1fT2RYMjLUGI/YkyfzQRBsUTPUXb690wpUnWxZPfJs5oM/KLHZ+uIbKOqbjhDUQVt /92A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1718783347; x=1719388147; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=FRM5THfCRJplYUEolYfayyEEOVerrHZllYPP6TFy1kA=; b=g95Q7eZwYiFsxWHb5Xawid7csGOZyi6y64PRmXWkIKumWijUST5FZhXOkqUwhMbkwN lPvNiyun88wqBpMR6Mfrf/b01JC+mYNL0wMrCRF8KPPRcOGg8zF1GWyNgg/EcU78trDc uzdp8fhJAC3TEMhyfI0ipcbFyBTeqzA73EpL3LGBS8z/o9NKIU+2heB88Yshvpo7K38o jrLeozEvUWVcrGTXdCatTmND41h+6IoYDM054biD31gpGOLPRPpQd31VoC2suyxjRlaI sCmRYjZUzpUQQRK2xoH/5vNdE0y/7dThbnTMgBrVdwn4Ab9b/cluVB017wGzo7WrCJE8 /HZA== X-Gm-Message-State: AOJu0Yys176vDv4tMprq7SLm0DpAPA5pXSsUzdXDhfQaLabsZmHlrn79 Ka0fprb/E/omShpxViYgdI8lWW6y0JvGJG/GFV8Jjfzd5Q+H2LleECI/AZ3gepY3eiH0p9PURcR mwuEeEH0B2lQwHWE6yYQ93JR/D1wN/g6hUgzVw2rVTCkWvbU5kyw= X-Google-Smtp-Source: AGHT+IFyOSr0kzfdFCKpMbr2emu1TPYKgQiW3amG+vfwcfbvi0QUkGDEXx4+tyr+TFSxmbDWQTdqazdMFwHIr/qQlRU= X-Received: by 2002:a17:90a:ec12:b0:2c7:b606:a3be with SMTP id 98e67ed59e1d1-2c7b606a645mr1837592a91.28.1718783347441; Wed, 19 Jun 2024 00:49:07 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: From: Warner Losh Date: Wed, 19 Jun 2024 01:48:54 -0600 Message-ID: To: Dave Horsfall Content-Type: multipart/alternative; boundary="000000000000dee612061b396e60" Message-ID-Hash: VLZBRUCGILAABTQWCYRCLSBVF5ARP7RP X-Message-ID-Hash: VLZBRUCGILAABTQWCYRCLSBVF5ARP7RP X-MailFrom: wlosh@bsdimp.com X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header CC: Computer Old Farts Followers X-Mailman-Version: 3.3.6b1 Precedence: list Subject: [COFF] Re: Supervisor mode on ye olde PDP-11 List-Id: Computer Old Farts Forum Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: --000000000000dee612061b396e60 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, Jun 19, 2024, 1:37=E2=80=AFAM Dave Horsfall wro= te: > Sort of between kernel and user mode, Unix [zillion trademarks etc] never > used it. but did RSX-11? > 2.11BSD used a mode between kernel and user for the TCP stack to get more effective address space... Warner I used the latter long enough to hate it until Edition 5 arrived at UNSW, > and I still remember being blown away by the fact that there was nothing > privileged about the Shell :-) > > -- Dave > --000000000000dee612061b396e60 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


On Wed, Jun 19, 2024, 1:37=E2=80=AFAM Dave Horsfall &l= t;dave@horsfall.org> wrote:
=
Sort of between kernel and user mode, = Unix [zillion trademarks etc] never
used it. but did RSX-11?

=
2.11BSD used a mode between kernel and user for the= TCP stack to get more effective address space...
Warner

I used the latter long enough to hate it until Edition 5 arrived at UNSW, <= br> and I still remember being blown away by the fact that there was nothing privileged about the Shell :-)

-- Dave
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