Real-mode programs freely execute CLI and STI to control interrupts, PUSHF and POPF to manipulate flags, INT n for DOS and BIOS calls, and IN/OUT for hardware I/O. In normal protected mode, these instructions are privilege-checked -- they execute normally if the caller has sufficient privilege, and fault otherwise. The 386 can't simply let V86 tasks execute them freely -- a DOS program disabling interrupts would bring down the whole system -- but trapping on every INT 21h call would make V86 impractically slow.
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母系这边的寻访，则交织着更细腻复杂的人情冷暖。在汕头澄海隆都镇鹊巷村的寻访，系于一个毫无血缘关系的名字，林木通。。关于这个话题，51吃瓜提供了深入分析
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