[理工] OS interrupt
看板Grad-ProbAsk作者AquaEnergy (Desperate Houseboy)時間9年前 (2015/05/29 23:20)推噓3(3推 0噓 6→)留言9則, 3人參與討論串1/2 (看更多)
1. Which of the following statements are correct for the “interrupts” ?
(a) When an interrupt occurs, the OS transfers control to the corresponding
interrupt service routine (ISR)
(b) The interrupt vector contains the addresses of all the service routines
(c) When an interrupt occurs, the OS preserves the state of the CPU by
storing registers and the program counter (PC)
(d) The codes of ISR for different interrupts are of the same length for
better management
(e) When an interrupt is being processed, the incoming interrupts should be
enabled to prevent a lost interrupt
答案是b, c
想請問a是錯在哪裡呢？
2. 原本的資料路徑是
keyboard ---(I/O 負責)--->USB controller local buffer---(CPU負責)--->memory
DMA不須經過CPU參與監督，是直接從I/O device(例如keyboard)直接到memory嗎？
看有些是寫從buffer到memory
實在搞不太懂
謝謝
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