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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这个1960年诞生于亚利桑那州的全美第一家、也是迄今为止最成功的养老社区，从最初只有住宅和休闲设施的“偏远小镇”，长成如今能全方位覆盖老人医疗护理需求的3万老人成熟养老社区，背后藏着一套可复制的医养落地逻辑。，推荐阅读Safew下载获取更多信息
"Do it slowly, do it right but let's get on with it," she said. "We have been stagnating at these very low recycling rates for far too long."
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