OS development

LarsG · Post by **LarsG** » Wed Sep 24, 2003 11:22 am

8O Hehe, there's no way I'm going to trawl through the linux sourcecode... Even if my C skills weren't so damn poor, I wouldn't do it...

A book on the subject might help though... Still, I don't think it would be any harm in discussing the fundamentals, and different aspects and parts of an OS.. (that is, if someone here knows anything about it, and want to share their thoughts)

-Lars

dmoc · Post by **dmoc** » Wed Sep 24, 2003 12:41 pm

I definately would not say it *isn't* worth discussing, by all means do so. But as someone who has studied os design, if Dreglor wants to learn then there are probably a lot more informative (and knowledgeable) places to go. To give you (or anyone else) an idea of how big the discussion could get here is a contents page from a typical reference book (some would say *the* reference book):

http://cwx.prenhall.com/bookbind/pubboo ... ntent.html

There are various websites and usenet groups, eg, comp.os.research.

Where PB is concerned, and once Dreglor has some background info, it would be a good learning experience to try to emulate some of the basic OS techniques, eg, task/ memory management. PB would provide a safe environment for this rather than trying to hack together an actual OS kernel. Next step, much more interesting, would be to use PB to create a virtual OS. It might even be useful, look at the various DOS and Windows emulators/ virtualisations.

Dreglor · Post by **Dreglor** » Wed Sep 24, 2003 5:37 pm

well there are alot of things i want to learn in my own free time, and os's are one of them

but doning one wouldn't be a very easy
as dmoc pointed out you most likely *WILL* need a book to learn how frist before you do anything

now i do have some asm and c skills but i dought i even get based the boot sector >_>

Doobrey · Post by **Doobrey** » Thu Sep 25, 2003 1:13 am

Fred wrote:Shouldn't a real OS be coded in ASM ?

What? ASM is for girls...
Real OS developers code in pure binary

Dreglor · Post by **Dreglor** » Thu Sep 25, 2003 1:27 am

hehe, is it even possible to code directly in binary!?

freedimension · Post by **freedimension** » Thu Sep 25, 2003 8:36 am

Dreglor wrote:hehe, is it even possible to code directly in binary!?

Sure it is, or how do you think was the first programming language written?

spangly · Post by **spangly** » Thu Sep 25, 2003 1:05 pm

Dreglor wrote:hehe, is it even possible to code directly in binary!?

I used to code in Z80 on the spectrum without the aid of an assembler 8O
I could tell you the hex values for just about any z80 instruction

21 00 40 ld hl,16384

Yes, I am slightly insane!

Saboteur · Post by **Saboteur** » Thu Sep 25, 2003 1:36 pm

spangly wrote:I used to code in Z80 on the spectrum without the aid of an assembler 8O
I could tell you the hex values for just about any z80 instruction

21 00 40 ld hl,16384

Yes, I am slightly insane!

Ups...
I only remember
C9 ret
0 nop

When we'll have PureSpectrum Basic?

Hi-Toro · Post by **Hi-Toro** » Mon Sep 29, 2003 9:09 pm

Someone asked about this on the Bl**z forums a few weeks ago... here are the links I posted:

----

Writing Your Own Toy OS, parts 1, 2 and 3:

www.linuxgazette.com/issue77/krishnakumar.html
www.linuxgazette.com/issue79/krishnakumar.html
www.linuxgazette.com/issue82/raghu.html

[Correction to part 1]
www.linuxgazette.com/issue84/dashti.html

Misc

nocturnalnetwork.com/os.htm
www.osdever.net/
www.linuxgazette.com/issue85/mahoney.html

Create a minimal Linux-based OS:

linuxfromscratch.org/

-----------------

See also this thread on these very forums, complete with Mark's old BlitzOS...

www.blitzbasic.com/bbs/posts.php?topic=15774

And there's even (if you scroll down past the Ukrainian/Russian?) what appears to be a little crude BlitzOS developer documentation here!

http://www.humgat.kiev.ua:8100/~kittle/ ... /0397.html

Shannara · Post by **Shannara** » Tue Nov 04, 2003 2:44 am

I hate to bring this back up, but I have to know.

Why the heck is PB not suitable on making a OS? Fred mentioned why not use ASM, was that a joke?

I mean, the PB syntax gets converted into ASM before compiling, right? So it would be possible to make an OS in PB, right?

plouf · Post by **plouf** » Tue Nov 04, 2003 10:38 am

because PB creates code suitable to run under an existing OS
(Windows,Linux,AMigaOS) an OS should run without anythink else
it is possible to wirte a PB syntax compatible compiler to generate
code who will run in boot up ,but internal it will have much more stuff
(think that drivers should be build in etc) (and no API calls since no OS running

)

LarsG · Post by **LarsG** » Tue Nov 04, 2003 10:47 am

I believe it's possible to write an x86 OS using PB..
You'd have to code the foundation in ASM though.. (memory management, file-system etc... if you're not going to use an existing base for this)
and your own drivers and stuff.. but I believe it can be done...

Shannara · Post by **Shannara** » Tue Nov 04, 2003 5:38 pm

Well, I was thinking... we need a bootstrap and access to a few registers, not to mention the screen interrups, and your set. Can code from there. But since alot of PB's commands are from pre-existing os commands, that might be hard to emulate, unless you code them from scratch in PB or internal ASM, right?

If so..... If it is possible for Fred to give us a list of what commands call what, we could "emulate" such in pure asm via pb... only the commands that are needed... I think it would be possible.. but why? Because once all or most of the commands are implimented, you can use PB to build the rest of the system...

Dreglor · Post by **Dreglor** » Tue Nov 04, 2003 7:34 pm

well you would have to have the complier chunk out a asm file for you to edit so it can be compatible then you complie that in fasm and have it chunk out a .com file

and this is after you got the boot file and things you need before letting pb do the major programs

i think with a libarys and some conversion programs i sure you can get any pb program to work in a diffrent os

PureBasic Forums - English

OS development

Here ya go...