Sujet : Re: x86S Specification
De : camiel.vanderhoeven (at) *nospam* vmssoftware.com (Camiel Vanderhoeven)
Groupes : comp.os.vmsDate : 03. Nov 2024, 15:06:12
Autres entêtes
Organisation : A noiseless patient Spider
Message-ID : <vg800m$cvhp$1@dont-email.me>
References : 1 2 3 4
User-Agent : Mozilla/5.0 (Windows NT 10.0; WOW64; rv:91.0) Gecko/20100101 Firefox/91.0 SeaMonkey/2.53.19
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)
Camiel
x86S Specification
Re: x86S Specification