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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A game played on a turning wicket and dominated by spin was decided, appropriately, after a decisive, savage twist. Just as it looked as if England’s unconvincing progress through the World Cup was the one thing destined to remain on its predictable path Rehan Ahmed and Will Jacks spun the game, and the group, in their team’s favour.,详情可参考快连下载安装
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