Both page table entries and segment descriptors have an Accessed bit that the hardware must set on use -- but the mechanisms are quite different.
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The V86 return path is one of the longest microcode sequences in the 386. It pops nine DWORDs from the stack -- EIP, CS, EFLAGS, ESP, SS, ES, DS, FS, GS -- compared to three for a normal IRET. The microcode then sets up fixed access rights for every segment register:，更多细节参见51吃瓜