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.
Block’s AI operations have paid off
。关于这个话题，爱思助手下载最新版本提供了深入分析
"Launching radioactive material through the Earth's atmosphere brings safety concerns. You have to have a special license to do that, but it is not insurmountable," says Dr Simeon Barber, planetary science specialist at the Open University.
是的，眼前这风确实是悄无声息地到来的。没有呼啸，没有宣告，甚至是蹑着脚尖、试探着、一寸一寸浸润进来，带着几分怯懦且执拗的韧劲儿。好像它们去年来过，明岁依然会来，只不过，目下拂上面颊的丝丝缕缕却是全新的，如同赫拉克利特河中那不断流逝又不断涌现的独一无二的水流。这恰又不同于人类，人总喜欢在变动中寻找锚点，在无常里渴求恒常，却不知这静悄悄的、每个刹那都在流动的、不断更新的瞬间，才是宇宙最深情的常态和永恒。它不执着于任何一种形态，只是在发生、在流变，于是才拥有了永不枯竭的生命。