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).
int halftone_matrix[8][8] = {，这一点在91视频中也有详细论述
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program to pause in a data-dependent way. Writing your garbage