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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中年人忙于生计,两个妹妹从幼儿园起的养育和教育,几乎都落在外公外婆身上。外公信奉“棍棒底下出孝子”,但凡没按照他的要求行事,甚至犟嘴,定会挨打。
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