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Lecture 4 Page Table Isolation memory address spaces page tables(hardware support) every app has its own map(page table) perpage(4KB, 4096 = 2^12 -> offset = 12) virtual address(64) = {EXT(25) + index(27) + offset(12)} RISC-V physical address(5

Lecture 3 OS Organization and System Calls UNIX interface abstract the hardware resources process: instead CPU exec: instead of memory file: instead of disk block OS should be defensive app cannot crash the OS app cannot break out of its isolation

Lecture 1. Introduction And Example 课堂板书 OS Design Hands-on experience(xv 6) OS purposes abstract hardware multiplex isolation sharing security performance range of uses OS organization cpu、ram、disk、network user space: text editor(vi)、complier(CC)、sh