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.
Жители Санкт-Петербурга устроили «крысогон»17:52
。业内人士推荐体育直播作为进阶阅读
FT Edit: Access on iOS and web
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“中国铁路”消息，近日，有媒体依据网传信息刊发了西安至广州东的K731次“火车硬座惊现上下铺”报道，引发关注，铁路客运部门迅速组织了核查。