OSDev.org

Posted: **Mon Nov 08, 2004 4:19 am**

I wrote a 25-page long document on how to setup your first kernel in Word format and uploaded it to http://membres.lycos.fr/preludesoftware/osdev.doc (111kb) in Word 2000 format and osdev.txt (40kb) in plain text (which I quickly generated from Word).

It is mainly targeted to Windows users. It is a first draft and much more will be added in the next few days. I expect the document to include informations about a C++ kernel, a simple memory manager, a basic C++ standard library, using the mouse and keyboard and finally the FAT32 filesystem by the end of the month, so check often.

Those interested to be contacted for updates can email me at [email protected]. Ideas and critics are welcomed.

Preface
Introduction
1. What you need (basic tools, integrating cygwin tools in VC++ 6.0 IDE)
2. Your first kernel (very simple commented ASM kernel)
3. Compiling 'n linking (using make, NASM, ld with a commented script and objcopy)
4. The image (using grub, partcopy and winimage)
5. Bochs (using and configuring Bochs)
6. Booting (Unfinished, booting with Bochs)

Posted: **Mon Nov 08, 2004 5:05 am**

what about a pdf version for lusers like me that have no decent .doc viewers linked to their browsers ?
::)

on page 5:

Cygwin is a Linux-like shell working on Windows.

Actually, it's much more than a shell: it's a complete port of most development tools you use daily on a unix system (make, gcc, ld, less, info, and many many more)

on page 8:

Command
c:/bochs/bochs.exe

are these slash's or backslash's ?

all in all, that seems to be rather a good document, probably more targetted at younger audience that tells step by step how to set up a OSdev'ing environment ...

maybe it lacks a "reference" section with all the download links, documentation centrals, etc.

Posted: **Mon Nov 08, 2004 6:18 am**

All in all, good read so far.

But perhaps needlessly complicated in some places. Think about:

* why not use the Cygwin shell, but instead doing all that copying of Cygwin exe's to alternative locations?

* why download NASM for the measly couple of ASM lines - you already have GAS with GCC?

* why make the objdump wrapper into an executable, if all it does is an alias? A one-line DOS script or Cygwin-shell alias should suffice...

* you repeatedly mention C++, but the init.asm you describe doesn't jump into C++ code, and does nothing to provide C++ support.

Just think about the above. And, dude - what do you mean, a "basic C++ standard library"? I fear you're in for a rude surprise as to what that would entail. I'm just about to release my first throw at a freestanding C library (by definition a subset of the C++ lib), and boy, it ain't funny to go there... but the best of luck to you.

Posted: **Mon Nov 08, 2004 9:08 am**

Very good document

This will help me a lot

Posted: **Mon Nov 08, 2004 3:34 pm**

Responding to tow posts here.

* why not use the Cygwin shell, but instead doing all that copying of Cygwin exe's to alternative locations?

Good point. I did that personally for some reasons, but they don't apply here.

why download NASM for the measly couple of ASM lines - you already have GAS with GCC?

Because I don't know about gas and the asm kernel will get bigger.

why make the objdump wrapper into an executable, if all it does is an alias? A one-line DOS script or Cygwin-shell alias should suffice...

A batchfile would do the job, good idea.

you repeatedly mention C++, but the init.asm you describe doesn't jump into C++ code, and does nothing to provide C++ support.

I know, give me a couple of days. I wrote that thing in 5 hours straight and much more is coming.

Just think about the above. And, dude - what do you mean, a "basic C++ standard library"?

I mean exactly that.

=======================================

what about a pdf version for lusers like me that have no decent .doc viewers linked to their browsers ?

I'll see what I can do

are these slash's or backslash's ?

I stick with slashes throughout the document, though I could change them all to backslashes. Yeah, good point, I'll do that.

all in all, that seems to be rather a good document, probably more targetted at younger audience that tells step by step how to set up a OSdev'ing environment ...

Exactly, like I was a couple of months ago :)

maybe it lacks a "reference" section with all the download links, documentation centrals, etc.

Give me a couple of days and you'll have that.

Jonathan

Posted: **Tue Nov 09, 2004 6:34 am**

Just uploaded an update, still at http://membres.lycos.fr/preludesoftware/osdev.doc.

Pype.Clicker notified me that he made a PDF version of the document's first version at http://www.atlantisos.com/mirror/osdev_tut/osdev.pdf. Perhaps he will make another one for the update, I don't know.

By the way, I am searching for a free host where I could put the document in html format. Does anybody know about one?

Thanks,

Jonathan

Posted: **Tue Nov 09, 2004 6:51 am**

chances are that *candy* notified you, not me ...

Posted: **Tue Nov 09, 2004 8:46 am**

<quote>
chances are that *candy* notified you, not me ...
</quote>

Your are quite right, I messed up the nicknames since you were the one who talked to me about a pdf version. Sorry for the troubles.

Jonathan

Posted: **Thu Nov 11, 2004 9:13 am**

I got one problem.
I'm trying to link my files like the tutorial tells me to do
c:/utils/nasm.exe -f elf init.asm -o init.o ld -T link.ld -nostdlib -o kernel.tmp init.o

but i got this error:
nasm: error: more than one input file specified
nasm: error: unrecognised option `-T'
nasm: error: more than one input file specified
nasm: error: unrecognised option `-n'
nasm: error: more than one input file specified

I hope someone could help me

Posted: **Thu Nov 11, 2004 10:02 am**

c:/utils/nasm.exe -f elf init.asm -o init.o ld -T link.ld -nostdlib -o kernel.tmp init.o

that should be ld not nasm. your using a link command line with the assembler

Posted: **Thu Nov 11, 2004 12:10 pm**

df wrote:
c:/utils/nasm.exe -f elf init.asm -o init.o ld -T link.ld -nostdlib -o kernel.tmp init.o
that should be ld not nasm. your using a link command line with the assembler

Just in case you didn't get it. That means that the above line is actually 2 seprate commands not a single one the first being

Code: Select all

c:/utils/nasm.exe -f elf init.asm -o init.o

and the next being

Code: Select all

ld -T link.ld -nostdlib -o kernel.tmp init.o

Posted: **Thu Nov 11, 2004 2:34 pm**

Not too bad at all. I myself am just a beginner to the os dev scene, and so I'm making an attempt to document the exact steps I took and the knowledge I learn, as I learn it, I'm writing in a tutorial-like format, as I go along so other people can read and hopefully follow it in the future. So far, it's looking very much like yours, only a bit more detailed. I guess you beat me to it

More documentation and tutorials, however, are always welcome in the OS developement world I think.

OSDev.org

Wrote and posted kernel-101 documentation

Wrote and posted kernel-101 documentation

Re:Wrote and posted kernel-101 documentation

Re:Wrote and posted kernel-101 documentation

Re:Wrote and posted kernel-101 documentation

Re:Wrote and posted kernel-101 documentation

Re:Wrote and posted kernel-101 documentation

Re:Wrote and posted kernel-101 documentation

Re:Wrote and posted kernel-101 documentation

Re:Wrote and posted kernel-101 documentation

Re:Wrote and posted kernel-101 documentation

Re:Wrote and posted kernel-101 documentation

Re:Wrote and posted kernel-101 documentation