Some IDT Code...in C

[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.

[Pype.Clicker]

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.

[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?

[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.

[jrfritz]

Ok...i'll try...at least my GPF handler is working...

[jrfritz]

Nope...didn't work.

[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

[jrfritz]

I'm not sure if this works but:

IDThan0:
pusha
call C code
popa
iret

Also...that eax stuff didn't work.

[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.

[jrfritz]

My boot.asm is in this file:http://www.mega-tokyo.com/forum/attachments/uploaded_files/Prekernel0-3.zip

[beyondsociety]

I was referring to your non-working code, I.E the IDT in C and the other asm code thats giving you problems.

[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.

[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?

[beyondsociety]

Sorry. Could I at least look at your asm code thats giving you the stack problem.

[jrfritz]

::) It's in the file link I gave you...

And I would still like to know how to do that virtual address thing.