Sujet : Re: x86S Specification
De : arne (at) *nospam* vajhoej.dk (Arne Vajhøj)
Groupes : comp.os.vmsDate : 03. Nov 2024, 15:22:16
Autres entêtes
Organisation : A noiseless patient Spider
Message-ID : <vg80uo$d0cf$1@dont-email.me>
References : 1 2 3 4 5
User-Agent : Mozilla Thunderbird
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
x86S Specification
Re: x86S Specification