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Old 12-03-2004, 10:39 AM   #1
vito_huang
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Registered: Oct 2004
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kernel questions


what does kenerl acutly do??/ i mean when does it start kernel, all i see when i complie and new kernel it just make an kernel image(about 3Mbytes),modules,and system.map. all this thing are under 100Mbytes. and when you boot linux you only boot the kernel image, is kernel really that small programs??i don't understand
when boot an small kernel image how can this small program reconstruct to an very power kernel
i mean under windows you have windows directory store the kernel things, but in linux there are only three things to construct an power system(does it possible or i am wrong??)

and i also don't understand when kernel it loaded it load init within the /sbin/init but all the init are bash scripts,it need an bash shell to interrputer it, so it shoud load an bash shell first, therefore the process for number 1 will be bash(or some other console) not init

can somebody point out what i am saying here is wrong and give some useful documentation URL to me !!!!!!
 
Old 12-03-2004, 11:09 AM   #2
sigsegv
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Registered: Nov 2004
Location: Third rock from the Sun
Distribution: NetBSD-2, FreeBSD-5.4, OpenBSD-3.[67], RHEL[34], OSX 10.4.1
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First, /sbin/init is not a shell script.
Code:
[~]# file /sbin/init
/sbin/init: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), for GNU/Linux 2.2.5, dynamically linked (uses shared libs), stripped
The kernel is the very most base part of the OS. For the most part, all the kernel does is move data around. It handles talking to the hardware, and making sure programs run (that is, as a scheduler). During normal bootup the bootloader loads the kernel, which then takes off and probes your hardware, finds the root filesystem, and kicks off init. Init handles bringing up the rest of the system to whatever runlevel is specified in inittab.

The kernel on Win32 is not all of %system32%. It's %system32%\kernel.exe (and usually some DLLs, which are roughly equal to LKMs in the Linux world).

HTH
 
Old 12-03-2004, 11:09 AM   #3
0pal_t0ad
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Registered: Feb 2004
Location: Southampton, England
Distribution: Laptop:Gentoo-i686-2.6.9-r9 Desktop:Slackware10 2.4.26
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this should explain everything: http://www.tldp.org/LDP/tlk/
 
  


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