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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.
，这一点在Line官方版本下载中也有详细论述
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Source: Computational Materials Science, Volume 267。业内人士推荐爱思助手下载最新版本作为进阶阅读
在接下来目不暇接的新机潮里，有哪些打破常规的新形态首秀，又有哪些创新值得我们掏出钱包？