When VM=1, the protected-mode bit goes low and the Entry PLA selects real-mode entry points -- MOV ES, reg takes the one-line path. Meanwhile, CPL is hardwired to 3 whenever VM=1, so the V86 task always runs at the lowest privilege level, under full paging protection. The OS can use paging to virtualize the 8086's 1 MB address space, even simulating A20 address line wraparound by mapping pages to the same physical frames.
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2024年12月20日 星期五 新京报
圖像加註文字，時任美國國安顧問沙利文曾與張又俠會面。爭議：「洩露核秘密」
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Apple’s new M3 MacBook Air is $300 off at Amazon. And yes, I’m tempted.
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