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.
The fast path: 1.5 cycles from EA to physical address。关于这个话题，旺商聊官方下载提供了深入分析
2025年，广东深圳南山区成功迈入“万亿城区”。南山区为什么能？营商环境的持续优化完善，正是发展密码之一。。搜狗输入法2026对此有专业解读
ВсеРоссияМирСобытияПроисшествияМнения，这一点在91视频中也有详细论述