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Re:Some IDT Code...in C
Posted: Wed Dec 18, 2002 7:57 am
by DarylD
Berserk,
What books have you bought? What does it explain in there about IDT's? Maybe we can clarify if the books description is not very clear.
Daryl.
Re:Some IDT Code...in C
Posted: Wed Dec 18, 2002 9:05 am
by Pype.Clicker
Berserk wrote:
Could Somebody PLEASE, PLEASE explain to me, WHAT IS AN IDT! and What does it do??
;D
okay, Bersek. What if you stop bugging ppl with repeated questions and ask GOOGLE instead ? Get the
Intel manuals
(alt: special low bandwidth plain text copy)
and check sections 9.4 and 9.5 about interrupt descriptor tables.
Thanks in advance.
Re:Some IDT Code...in C
Posted: Wed Dec 18, 2002 10:08 am
by jrfritz
I am in PMode when I setup my stack and I use bits 32 before I setup my stack.
If I put 0xFFFFFFFF in ESP ( in Pmode ) BOCHS says it's running in "bogus" memory and my computer tripple faults when I run it out of BOCHS.
How do I make my stack 0xFFFFFFFF?
Re:Some IDT Code...in C
Posted: Wed Dec 18, 2002 11:20 am
by beyondsociety
Have you tried changing the registers mainly the ax register which is 16 bit to a 32 bit register?
Code: Select all
mov ax,0x10
mov ss,ax
mov esp,0xFFFFFFFF
To
Code: Select all
mov eax,0x10
mov ss,eax
mov esp,0xFFFFFFFF
Not sure if there is a 32 bit register for the stack. I not sure if this would help. Its worth a try.
Re:Some IDT Code...in C
Posted: Wed Dec 18, 2002 11:22 am
by jrfritz
Ok...i'll try...at least my GPF handler is working...
Re:Some IDT Code...in C
Posted: Wed Dec 18, 2002 11:33 am
by jrfritz
Nope...didn't work.
Re:Some IDT Code...in C
Posted: Wed Dec 18, 2002 11:33 am
by Unexpected
Hi,
I still have a bugs with my handlers
In every code what I had been saw, the handlers look diference. Can anyone post a simple handler?
Witch looks like this:
Code: Select all
IRQ0:
... some pushs?...
CALL _C_Function ; For example with one variable
...some pops?...
IRET
Thnx!
P.S. - Sorry for my terrible english
Re:Some IDT Code...in C
Posted: Wed Dec 18, 2002 11:47 am
by jrfritz
I'm not sure if this works but:
IDThan0:
pusha
call C code
popa
iret
Also...that eax stuff didn't work.
Re:Some IDT Code...in C
Posted: Wed Dec 18, 2002 12:12 pm
by beyondsociety
Tom, post your code so I can have a look at it. If I can't figure out your problem, at least maybe someone else can.
Re:Some IDT Code...in C
Posted: Wed Dec 18, 2002 12:16 pm
by jrfritz
Re:Some IDT Code...in C
Posted: Wed Dec 18, 2002 12:20 pm
by beyondsociety
I was referring to your non-working code, I.E the IDT in C and the other asm code thats giving you problems.
Re:Some IDT Code...in C
Posted: Wed Dec 18, 2002 12:22 pm
by DarylD
Have you got the top of the virtual address space mapped? Otherwise won't setting esp to 0xFFFFFFFF just cause a page fault?
Daryl.
Re:Some IDT Code...in C
Posted: Wed Dec 18, 2002 12:27 pm
by jrfritz
beyondsociety...my IDT is working now! I'm having stack problems now!
Have you got the top of the virtual address space mapped? Otherwise won't setting esp to 0xFFFFFFFF just cause a page fault?
:-[ That sounds scary...how do I fix this?
Re:Some IDT Code...in C
Posted: Wed Dec 18, 2002 12:29 pm
by beyondsociety
Sorry. Could I at least look at your asm code thats giving you the stack problem.
Re:Some IDT Code...in C
Posted: Wed Dec 18, 2002 12:31 pm
by jrfritz
::) It's in the file link I gave you...
And I would still like to know how to do that virtual address thing.