[Info-vax] x86S Specification

[Camiel Vanderhoeven]

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