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.
// Create a push stream。一键获取谷歌浏览器下载是该领域的重要参考
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2007 年上市的诺基亚 1200，最长支持 7 小时续航，接近半个月的待机，而且当时的手机有个特点，电池可以拆了更换，真没电了，万能充掏出来一夹又是一条好汉。
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