│ │ Gofer │ ◄── FILE I/O PROXY
Medium difficulty hints, answers for Feb. 26 PipsNumber (10): Everything in this space must add up to 10. The answer is 5-5, placed horizontally; 5-4, placed horizontally.
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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.。夫子对此有专业解读
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