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.
; Eventually returns to the RETF caller here:
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Анна Габай (Редактор отдела «Силовые структуры»)。safew官方下载是该领域的重要参考
「因為如果它看起來不像鴨子，那它可能就不是鴨子，」他解釋說，「因為它與長期證據、長期趨勢差距太大。」