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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.
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const dropOld = Stream.push({ highWaterMark: 2, backpressure: 'drop-oldest' });
前两代被视作高端标配的钛金属中框，在 S26 系列上悄悄退场，换回了熟悉的铝合金。抛开营销层面的高级感不谈，铝合金在机身散热、重量控制和加工精度上，其实能提供更扎实的日常握持体验。只不过，iPhone 17 Pro 系列在换回铝合金后，抗击打能力收到大量用户的质疑，「珠玉在前」，S26 系列上铝合金机身的抗摔能力也需要进一步测试。