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Russ Cox Frans Kaashoek Robert Morris August 31, 2020

Xv6: a simple, unix -like teaching operating systemRuss CoxFrans KaashoekRobert MorrisAugust 31, 20202 Contents1 Operating system and memory .. and File descriptors .. system .. world .. 202 Operating system physical resources .. mode, supervisor mode, and system calls .. organization .. : xv6 organization .. overview .. : starting xv6 and the first process .. world .. 283 Page hardware .. address space .. : creating an address space .. memory allocation .. : Physical memory allocator .. address space .. : sbrk .. : exec .. world .. Exercises .. 394 Traps and system trap machinery .. from user space .. : Calling system calls .. : System call arguments .. from kernel space .. exceptions .. world .. 485 Interrupts and device : Console input .. : Console output.

and a file system—and illustrates them with code snippets and discussions of how the shell, Unix’s command-line user interface, uses them. The shell’s use of system calls illustrates how carefully they have been designed. The shell is an ordinary program that reads commands from the user and executes them. The

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