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).
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In the latest series of the Netflix documentary Drive to Survive, released on Friday, the Australian driver said he had been threatened by email, describing the atmosphere around what proved to be his final race as “pretty heavy stuff”.