Building an operating system for senior project? Post: 302444733

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Top Forums Programming Building an operating system for senior project? Post 302444733 by Corona688 on Thursday 12th of August 2010 03:55:19 PM

08-12-2010

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How "serious" an OS is this? Is it a theoretical construct, or does it need to fully utilize a modern system?

If you could get away with writing in 16-bit real mode, your work would be miles easier -- you could write a "hello world" without having to worry about disk drivers, keyboard interrupts, timing controllers, or any protected-mode histrionics by relying on BIOS I/O calls. Once you've got your "hello world" working, you can start building the structure from there. I'd almost say you have to start this way, getting a tinkertoy version of your OS running in 640K might happen before you manage to properly switch into real mode. If people really like it, they could reinvent it in protected mode themselves, like how Minux inspired Linux.

Either way though, getting a bootloader to load a kernel is way different than getting an OS to load a program. Some "magic" code is needed, and you need to put the right things in the right places. Play around with the GRUB bootloader, and have a look at the source code for memtest86 -- it's a small program that loads and runs raw from the bootloader too.

Last edited by Corona688; 08-12-2010 at 05:03 PM..

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LEARN ABOUT BSD

kgmon

KGMON(8)						      System Manager's Manual							  KGMON(8)

NAME

       kgmon - generate a dump of the operating system's profile buffers

SYNOPSIS

       /usr/sbin/kgmon [ -b ] [ -h ] [ -r ] [ -p ] [ system ] [ memory ]

DESCRIPTION

       Kgmon  is  a  tool used when profiling the operating system.  When no arguments are supplied, kgmon indicates the state of operating system
       profiling as running, off, or not configured.  (see config(8)) If the -p flag is specified, kgmon extracts profile data from the  operating
       system and produces a gmon.out file suitable for later analysis by gprof(1).

       The following options may be specified:

       -b     Resume the collection of profile data.

       -h     Stop the collection of profile data.

       -p     Dump the contents of the profile buffers into a gmon.out file.

       -r     Reset all the profile buffers.  If the -p flag is also specified, the gmon.out file is generated before the buffers are reset.

       If  neither -b nor -h is specified, the state of profiling collection remains unchanged.  For example, if the -p flag is specified and pro-
       file data is being collected, profiling will be momentarily suspended, the operating system profile buffers will be dumped,  and  profiling
       will be immediately resumed.

FILES

       /vmunix - the default system
       /dev/kmem - the default memory

SEE ALSO

       gprof(1), config(8)

DIAGNOSTICS

       Users  with only read permission on /dev/kmem cannot change the state of profiling collection.  They can get a gmon.out file with the warn-
       ing that the data may be inconsistent if profiling is in progress.

4.2 Berkeley Distribution					 November 17, 1996							  KGMON(8)