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Linux Architecture Overview.

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Presentation on theme: "Linux Architecture Overview."— Presentation transcript:

1 Linux Architecture Overview

2 Initialization Uboot – hardware init, loads kernel
Kernel – remaining initialization, calls “init” Init – 1st process, executes startup script /etc/init.d/rcS Run_flphone.sh – startup script Nano-X – the X-Windows server Nanowm – sets bg image

3 System Structure MicroKernel – minimal functionality
Interprocess communication (IPC) Memory management Autonomous processes & co-routines VFS Network stack Process manager Device drivers Non-kernel windowing system compiler shells Editors utilities

4 System Structure-2 VFS Vmem mmap Proc, sysfs TCP, IP, etc NFS MM IPC
Sockets Process Control VFS Vmem mmap Proc, sysfs TCP, IP, etc Process memory NFS File sys MM IPC

5 System Structure User mode space Kernel mode space Kernel +
System Call Interface Device drivers Kernel + h/w related code

6 Structural Problems Erroneous co-routines can block system
Formal interfaces slow down system

7 Directory structure

8 /bin Essential user command binaries that need to be available also in single user mode.
/sbin Essential system binaries (e.g. init, insmod, ifup) /lib Libraries for the binaries in /bin and /sbin /usr/bin Non-essential user command binaries that are not needed in single user mode /usr/sbin Non-essential system binaries (e.g. daemons for network-services) /usr/lib Libraries for the binaries in /usr/bin and /usr/sbin /etc Host-specific system-wide configuration files /dev Device files /home User home directories (optional) /proc Virtual file system documenting kernel and process status as text files


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