[Info-vax] x86S Specification

[Arne Vajhøj]

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