ATM cards. To the modern reader that sounds strange, but we have to discuss one
To avoid the two memory reads on every access, the 386 includes a 32-entry Translation Lookaside Buffer (TLB) organized as 8 sets with 4 ways each. Each entry stores the virtual-to-physical mapping along with the combined PDE+PTE permission bits.
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The TLB lookup is combinational -- it evaluates in the same half-cycle as the limit check, requiring no additional clock. The common case (TLB hit, no page boundary crossing) adds zero overhead to a memory access. This is why the Segment Descriptor Cache and Page Cache (TLB) together occupy such substantial die area -- they are the fast path that makes protected mode competitive with real mode.
For additional guidance:
，详情可参考雷电模拟器官方版本下载
Константин Лысяков (Редактор отдела «Россия»)
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