OSDev.org

Hey everyone! It's been awhile, but I decided to hop back into OS dev'ing for a little while. I left off after implementing paging/memory management into my kernel, and I was wondering if any of you have implemented a working software or hardware multitasking system, as I would like that to be the next goal for my little hobby.

I have worked on a hardware context switching system, but I cannot get it to work... back to google for now...

I am aware of the pros and cons of each system, and I would like to use software multitasking, but I can't find any good resources out on the web. Do any of you have any reliable resources/code that I could look at?

Thanks,
Michael

Forget hardware multitasking. It's inflexible and only works on x86 chips in 32bit mode.

There is lots of info on this site and osdever.net. If you have any specific questions I can answer them as I have implemented a ring0/3 software task switcher.

Many people have done on this forum, i'd take a look at www.jamesmolloy.co.uk, as his tutorials are excellent and cover loading modules.. which is the first step to programs.

you then need ELF/COFF(-PE) (depending on format)relocation to successfully run the app.

i can't help with multi-tasking im afraid, as i have no idea myself, apart from that it involved using the GDT to create a TSS for each task.

lukem_95 wrote:i can't help with multi-tasking im afraid, as i have no idea myself, apart from that it involved using the GDT to create a TSS for each task.

Thats only for hardware task switching. Software switching only requires one TSS per CPU (to store the Ring 0 ESP).

Thanks for reminding me about osdever... Reading one of the tut's now

Thanks,

Michael