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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defined upfront. That approach can lead to slightly longer code in simple
这其中,中国市场依然是极为重要的板块。截至2025年年末,麦当劳在中国内地的门店数量突破7700家,已完成全国省级行政区全覆盖,下沉市场成为扩张重点。