How to create a multistage bootloader with asm and c?

Question

I want to create a simple 32-bit text-based operating system.

Bootloader :

Firstly I want to create a multistage bootloader.

Stage 1 : Assembly code (NASM-Compiler)

Stage 2 : C (GCC-Compiler)

Kernel:

Then it should load Kernel which should be written in C (GCC-Compiler)

I would also like to know how to properly compile and execute it.

Emulator should be Qemu

A sample 32-bit Operating System that displays "Hello world" would be helpful.

It sounds like you're asking how to write an entire bootloader from scratch. That's much too broad a question — the "answer" would involve someone writing most of one for you. There's no simple "here's how to write a bootloader" in a few sentences or paragraphs. — Wyzard, Jul 28 '15 at 05:20

Basile Starynkevitch · Accepted Answer · 2018-09-06T13:34:56.533

2

Don't write your own bootloader. Configure and use an existing bootloader, probably GRUB. This would make using your toy OS much easier (both for you and for other users).

Read http://osdev.org/ since they have a lot of resources about OS building on PCs (including a hello world OS).

Read also some good operating system book (e.g. Operating Systems: Three Easy Pieces). You'll find out that there cannot be very simple OSes. See also this answer.

Also, be at least quite fluent with POSIX and with Linux system programming (read Advanced Linux Programming at first).

edited Sep 06 '18 at 13:34

answered Jul 28 '15 at 05:30

Basile Starynkevitch

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OK, Thank you. Is there any 32-bit open source text-based operating system that i can experiment with ? – Project-A Aug 04 '15 at 01:53
Linux is such an OS.... and [osdev](http://osdev.org/) has some links; BTW, I don't understand what you mean by text-based OS (since any POSIX system is text-based) – Basile Starynkevitch Aug 04 '15 at 05:53
I was just looking for something like unix type operating system. By the way, i just improvised my question. Kindly take a look at it. – Project-A Aug 13 '15 at 15:59
Then, don't write a bootloader but focus your effort on your OS (and load it with GRUB) – Basile Starynkevitch Aug 13 '15 at 16:40
Ok, Thank you for your answer. – Project-A Aug 13 '15 at 16:52

How to create a multistage bootloader with asm and c?

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