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From: =?UTF-8?Q?Arne_Vajh=C3=B8j?= <arne@vajhoej.dk>
Newsgroups: comp.os.vms
Subject: Re: x86S Specification
Date: Sun, 3 Nov 2024 09:22:16 -0500
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On 11/3/2024 9:06 AM, Camiel Vanderhoeven wrote:
> Arne Vajhøj wrote:
>> x86-64 in long mode only support 2 modes in PTE's, so
>> VMS x86-64 is a hardware 2 mode OS 4 mode OS - U in ring 3,
>> S, E and K in ring 0.
> 
> Not exactly.
> 
> Ring 3 is used for Exec, Super, and User
> 
> Ring 0 is used for kernel and for transitions between modes (SWIS)
> 
> Running Exec and Super in ring 0 would blow away the separation (which, 
> I might add, is there more for stability than for security, before I 
> unintentionally re-start that debate)

You are more afraid that DCL or RMS would step on VMS than
applications would step on DCL or RMS?

Arne