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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臨床心理學家鄧肯·普雷舍斯（Duncan Precious）在2013至2020年間於英國與澳洲軍隊任職，如今是國防顧問公司CDS Defence & Security的臨床總監與韌性顧問（resilience consultant）。。关于这个话题，heLLoword翻译官方下载提供了深入分析
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