Re: [apostle-developers] design

[Guido de J. <gu...@us...>]

On Saturday 06 October 2001 09:33, you wrote:
> hi guido,
>
> > > setting entry 0 in page table 0x07fda000 to
> >
> > 0x07fd0008
> > Maybe you mistyped something here, 'cause the last
> > address should read
> > 0x000b8007. Please verify.
>
> iam correct here... it is not 0x000b8007 but its
> 0x07fda000

I meant the 2nd address: 0x07fd0008?

> i put an extra printf into the sys_port_enable
> function in the nucleus.
>
> it shows that only the first port (as coded in the
> init main.c... i dont remember the number now as iam
> mailing from my office. i will give the port number
> this evening.) is enabled. the second is NOT enabled.
> this is the exact point where i get the gpf.
>
> if every thing is correct i assume that two printf's
> in the sys_port_enable should happen, with the
> appropriate port numbers. but that dosent happen.

That is indeed what I would expect.

> so i think the port is not enabled. and the reson for
> that is the wrong entry where page table is set to
> 0(as in the begining of the mail).
>
> as this address is not pointed by the page table
> entries its throwing a page fault(cos' if the entry
> was 0x000b8007 as said by u... that would be a valid
> page table entry for the page fault address
> 0x000b8000).

What could happen is that the 1st sys_port_enable screws up some page tables. 
But I still don't think this has anything to do with the 0x000b80007 page. 

> so, am i correct or i have got it all wrong ;-)
> also, i will give more info today evening.

OK, more info is really needed.

Guido