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.
Since I started using a treadmill at my desk, I’m addicted to walking. The inexpensive treadmill I have now overheats despite a cooling fan we added over the motor, an additional external fan, frequent dusting, and copious amounts of lubrication.
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Landscape gardener Lee Claydon, 45, of Bournemouth, Dorset, died after the incident at the London venue on 2 August 2025.
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return j; // 返回pivot的最终位置
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