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.
Sometimes it takes a long time before I figure out what I actually want to write, and then everything falls into place:
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for (const auto &seg : segments) {,推荐阅读爱思助手下载最新版本获取更多信息
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Ok, this is all good when the tasks slice doesn’t escape. But what if