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identity=mailfrom; envelope-from="miller@hamnavoe.com"; helo=mx2.mythic-beasts.com; client-ip=46.235.227.24 Received: from mx2.mythic-beasts.com (mx2.mythic-beasts.com [46.235.227.24]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (prime256v1) server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx.topicbox.com (Postfix) with ESMTPS for <9fans@9fans.net>; Wed, 7 Jan 2026 04:44:45 -0500 (EST) Received: by mailhub-hex-d.mythic-beasts.com with esmtpsa (TLS1.2) tls TLS_RSA_WITH_AES_256_CBC_SHA (Exim 4.96) (envelope-from ) id 1vdQ5s-004x9u-1Z for 9fans@9fans.net; Wed, 07 Jan 2026 09:44:44 +0000 Message-ID: <77272bef6ca4f3fd68aa5ce5e96c1981@hamnavoe.com> To: 9fans@9fans.net Subject: Re: [9fans] risc-v memory layout From: Richard Miller <9fans@hamnavoe.com> Date: Wed, 7 Jan 2026 09:44:42 +0000 In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-BlackCat-Spam-Score: 1 Topicbox-Policy-Reasoning: moderate: sender is a member; group holds all messages Topicbox-Message-UUID: 80e69e8c-ebad-11f0-9b46-a35610c0285f Archived-At: =?UTF-8?B?PGh0dHBzOi8vOWZhbnMudG9waWNib3guY29tL2dyb3Vwcy85?= =?UTF-8?B?ZmFucy9UZjZlMGIxYjNmODBkZjgyMS1NMzZkYTc2NjhlMTE3ZmIxZjRhNzJm?= =?UTF-8?B?OGYxPg==?= List-Help: List-Id: "9fans" <9fans.9fans.net> List-Post: List-Software: Topicbox v0 List-Subscribe: Precedence: list Reply-To: 9fans <9fans@9fans.net> List-Unsubscribe: , Topicbox-Delivery-ID: 2:9fans:437d30aa-c441-11e9-8a57-d036212d11b0:522be890-2105-11eb-b15e-8d699134e1fa:M36da7668e117fb1f4a72f8f1:1:0XxZDIlBraWwvVMZru-8DqlLt48oygy2DhN3tnB1RV0 : > M mode, for > example, has no virtual addressing, and it would be useful (to say the > least) to have kernel and M mode have a common set of addresses. Basic question: when would you use M mode? Doesn't the kernel normally run entirely in Supervisor mode? Will the firmware on your platform even allow Plan 9 to get into M mode? ------------------------------------------ 9fans: 9fans Permalink: https://9fans.topicbox.com/groups/9fans/Tf6e0b1b3f80df821-M36da7= 668e117fb1f4a72f8f1 Delivery options: https://9fans.topicbox.com/groups/9fans/subscription