OSDev.org

Ok Guys i've booted using Grub. My kernel is at 1mb memeory mark. i've setup My idt with a default handler and my gdt with a kernel code and a kernel data selector am about to setup paging. then i'm at a DEAD END.
i want to write a posix compliant OS like Linux 0.0.1 but i get mad when i look at the code, cause i dont know where to go next and how to get there. i mean should i do the memory management part or the PIC part or filesystem part....? could anyone tell me a good way to do things from here to the finished Posix compliant OS.

you need to remap your the PICs before you can use interrupts.

BIOS programs the PICs so IRQs 0-7 are mapped to interrupts 8-15, and 8-15 are reserved for the CPU.
You should map IRQs 0-7 out of the way.

http://my.execpc.com/~geezer/osd/intr/index.htm

What now? Do what you should have done before you started: learn what you need to put in an operating system. That means a lot of reading -- see the Book Recommendations thread.