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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More Technology of BusinessWhy are more bosses sharing the top job?
After my doctor recommended I try a light therapy box to help mitigate the effects of the sometimes short, gloomy days, I found the Carex Day-Light Elite lamp which, despite the company not advertising this fact, works perfectly with a standard 100mm VESA mount. It’s mounted to the desk with an adjustable Ergounion E6 monitor mount with extension arm. During the day, when it’s not pointed at me, it’s pointed at the ceiling. Even at 50% intensity, the reflected cool white light really brightens the space.。关于这个话题，safew官方版本下载提供了深入分析