Bootloader not working.

[gabemaiberger]

My bootsector works fine and dandy but my bootloader keeps restarting my emulator when I try to jump to my kernel at the end of my bootloader. The code is in the file attached.

[justin]

I think you might need to include the selector for the kernel code segment:

Code: Select all

jmp 08h:startkernel

Does that work?

[gabemaiberger]

No, it keeps restarting in bochs and aborts in qemu.

[Kazinsal]

Look at bochsout. Check to see if it shows any errors, like "not a valid cs segment".

[justin]

Hmm, ok I thought of one more thing. You probably want BITS 32 before your protected mode code.

[gabemaiberger]

It still restarts. How do I access bochsout?

[iansjack]

How do you know that the fault is when it tries to jump to the kernel code rather than some error in that code? The problem may not be with the bootloader. It can be misleading to make assumptions.

[egos]

Are you sure that "kernel" code was loaded? I don't.

gabemaiberger, what values registers have at loadkernel? Are you sure that es=0 during reading?

[MilkyGirl]

You didn't add the TIMES directive to the end, nor the BIOS magic number.

[gabemaiberger]

It wasn't the bootloader at all. It was the kernel calling an interrupt in protected mode.

[Kazinsal]

It still restarts. How do I access bochsout?

In bochsrc:

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log: bochsout.txt