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Dertermination of Access Rights

  • CPL < 3 -> Supervisor-mode access
  • CPL = 3 -> User-mode access

CPL - Current Privilege Level 当前特权级 取决于 CPU 当前处于哪一个 代码段, CPL 与 当前段的段选择子中 RPL 保持一致 1

Segment Selector

  1. 5.5 PRIVILEGE LEVELS
    Normally, the CPL is equal to the privilege level of the code segment from which instructions are being fetched. ↩