OSDev.org

Posted: **Sat Jul 15, 2006 7:21 pm**

I am making some floppy code but something is happening in it
can anyone tell me anything that might be happening to cause the stack to get empty?
this simple code

Code: Select all

void FDD_MotorOn(drive){
	if(drive==0){
		outportb(DOR,0x14);
	}else{
		outportb(DOR,0x25);
	}
	wait(500);
}

and if I comment out the wait then it all works good, and I have tested the wait function throughly so its not wait
if I call fdd_motoron in another function then I get "can not pop off of stack" and if I call it at a 1 function higher then I get just a triple fault(no stack error reported)

Posted: **Sat Jul 15, 2006 8:02 pm**

Are you sure your stack segment isn't conflicting with your data or code segments?

Posted: **Sat Jul 15, 2006 8:30 pm**

I'm pretty sure not but I'll make sure(my stack I think is at the end of my code/data)

ok I changed my stack, which I needed to do anyway but it didn't work

edit:
w00t! now it works! I accidentally typed EBP instead of ESP so yea changign the stack worked
thank you so much!

also I bet that a lot of the other problems I had was because of that too if it can only handle down 9 of these functions(plus about 30 vars)

Posted: **Sat Jul 15, 2006 9:28 pm**

I think you have to take care of DMA transfer cuz floppy driver uses below 1MB mark, remember that...

OSDev.org

How is this ruining the stack!?

How is this ruining the stack!?