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Index > Main > Basic OS loading with bootstrep questions

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vargadanis



Joined: 09 Feb 2008
Posts: 9
vargadanis 09 Feb 2008, 15:44
No I am not willing to write the OS in basic. Smile

So I got to a point where I understand the boot process of the comp. More or less. I have a bootstrap program that writes string to the monitor (by writing the video memory) and I have a stack set up.
I just don't know whats next.
I would like to have the simplest system. I dont want any FS. Is it possible to write a binary file to the floppy right after the boot sector and I load it?
Yeah... by the way.. How do I do that? I mean how do I load the app to the memory and pass control to it?
Post 09 Feb 2008, 15:44
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 19869
Location: In your JS exploiting you and your system
revolution 09 Feb 2008, 15:50
Search for info about int 0x13 functions in the BIOS. There are already many examples on this very BB of boot sectors and loaders etc.
Post 09 Feb 2008, 15:50
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vargadanis



Joined: 09 Feb 2008
Posts: 9
vargadanis 09 Feb 2008, 16:05
k.. will do that
Post 09 Feb 2008, 16:05
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edfed



Joined: 20 Feb 2006
Posts: 4324
Location: Now
edfed 09 Feb 2008, 16:20
yeah, goto os construction/
Post 09 Feb 2008, 16:20
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Mac2004



Joined: 15 Dec 2003
Posts: 314
Mac2004 09 Feb 2008, 17:21
vargadanis: My boot loader example may help you....

http://board.flatassembler.net/topic.php?t=6529

regards,
Ma2004
Post 09 Feb 2008, 17:21
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edfed



Joined: 20 Feb 2006
Posts: 4324
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edfed 09 Feb 2008, 17:45
http://board.flatassembler.net/topic.php?p=69937#69937
this contain a good basis for Os development, and as you're new, i tell you this:
to speak about OS construction, there is a topic, named OS CONSTRUCTION.
Post 09 Feb 2008, 17:45
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rugxulo



Joined: 09 Aug 2005
Posts: 2341
Location: Usono (aka, USA)
rugxulo 13 Feb 2008, 05:26
vargadanis wrote:
I would like to have the simplest system. I dont want any FS. Is it possible to write a binary file to the floppy right after the boot sector and I load it?


Many Forth language environments support writing to "blocks", which are just tiny chunks of the disk without needing any file system.

http://www.forth.org/ (especially check out Forth compilers)

EDIT: Okay, not technically assembly-related, but Forth is pretty low level in most ways (and many are written in asm, so ...).
Post 13 Feb 2008, 05:26
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