I got pretty faR SINCE I my last post. I now load a small Testkernel into a new Segment and start it by jumping to a selector of a tss. The problem is that interrupts dont wrk.
if i cli then everything is fine. if i dont the machine resets.
Kernel and Loader (Prog. that loads the kernel) run in PL 0
InterrupttaBLE ISstill OK and ISR Code is not overwritten.
Please try to help me
Interrupts
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Ranieri
Re: Interrupts
The rebooting reeks of a triple fault to me.
That happens when an exception is thrown while trying to handle an exception.
Do you have any exception handlers in place for things like page faults?
That happens when an exception is thrown while trying to handle an exception.
Do you have any exception handlers in place for things like page faults?
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thomas
Re: Interrupts
I wrote handlers fpr interrupts 0-17. Sometimes theres an int 13. Every Exceptionhandler causes the pc to hang. And that works. (Hardware ints are shifted to 32++). AND: it works if interrupts are off. Also: there is nothing that could cause a triple fault. Code is:
BITS 32
GLOBAL start
start:
cli
mov ax, 24
mov gs, ax
mov [gs:0], word 0x721
loopit:
jmp loopit
If i immediately switch back to the loader program everything is fine ... so i think that the timerinterrupt is the bad one. Theres a handler for it. Very misterious
. I can send you the code if you want.
BITS 32
GLOBAL start
start:
cli
mov ax, 24
mov gs, ax
mov [gs:0], word 0x721
loopit:
jmp loopit
If i immediately switch back to the loader program everything is fine ... so i think that the timerinterrupt is the bad one. Theres a handler for it. Very misterious
. I can send you the code if you want.-
thomas
Re: Interrupts
i tried something else:
i loaded the kernelfile into the same segment as the loader and tata...interrupts work....
...why dont they when i load loader and kernle to different segs?
i loaded the kernelfile into the same segment as the loader and tata...interrupts work....
...why dont they when i load loader and kernle to different segs?
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mansonbound
Re: Interrupts
aha aha aha....i know now.
I asked my it-prof...but he dont know nothing *g*
(he lives in his 16bit realmode world)
I now loaded kernel into a segment and used the dataseg of the loader program....and tata......
The problem was the printtime function that used some vars that lay in the dataseg of the loader.
Ok...thank you all.....or so...
nice monologue *g*
I asked my it-prof...but he dont know nothing *g*
(he lives in his 16bit realmode world)
I now loaded kernel into a segment and used the dataseg of the loader program....and tata......
The problem was the printtime function that used some vars that lay in the dataseg of the loader.
Ok...thank you all.....or so...
nice monologue *g*