Что думаешь? Оцени!
The 386 supports four privilege rings (0 through 3), though in practice nearly all operating systems use just two: ring 0 for the kernel and ring 3 for user programs. Three privilege levels interact on every segment access: CPL (Current Privilege Level), DPL (Descriptor Privilege Level), and RPL (Requested Privilege Level).
。新收录的资料对此有专业解读
- "Experts argue that this approach has significant drawbacks."
threads multithreading support (on)