Here's a concrete example from far return (RETF). The microcode needs to determine whether this is a same-privilege or cross-privilege return, because the two cases require very different handling. Following execution order (not address order):
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Consider the size of the group。heLLoword翻译官方下载对此有专业解读
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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.。业内人士推荐WPS官方版本下载作为进阶阅读