Interrupt -What is an interrupt? The occurrence of an event is usually signaled by an interrupt from either the hardware or the software. Hardware may trigger an interrupt at any time by sending a signal to the CPU, usually by way of the system bus. Software may trigger an interrupt by executing a special operation called a system call (also called a monitor call). -Interrupt vector Containing the addresses of all the service routines -Interrupt architecture must save the address of the interrupted instruction. How does it save the instruction? -Incoming interrupts are disabled while another interrupt is being processed to prevent a lost interrupt -A trap is a software-generated interrupt caused either by an error or a user request. -An operating system is interrupt driven. -The operating system preserves the state of the CPU by storing registers and the program counter -Determines which type of interrupt has occurred Polling Vectored interrupt system. Difference between normal I/O operation and direct memory access(DMA)? The Single-Processor Systems and Multiprocessor Systems -Advantages of Multiprocessor systems 1.Increased throughput. 2.Economy of scale 3.Increased reliability Cache -What is the difference between main memory and cache? Main memory->DRAM cache->in CPU -- ★ ◤◢◤ ˍ ◣ ★ 健全的精神会寄宿 ★ ￣◥＜ / ★ ★ 在锻链过的健美肉体上 ▇/ ▇▇﹋ / ★ 你们看看在下的肉体吧! ◢█︶███◣◣/╱ ★ ★ ◥◤╭───╮◥◤ ◤ 豪腕の链金术师 ╰─┬─╯ ◤◣ 亚力士‧路易‧阿姆斯壮 --

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