Re: I/O flexpages / new mapping DB issue with overlapping ports

Espen,

On Wednesday 07 June 2006 18:16, Espen Skoglund wrote:
> [Frank Mehnert]
>
> > Hi,
> > I have a problem using I/O flexpages with Pistachio. My application
> > raises I/O pagefaults and the pager replies the corresponding I/O
> > flexpage. But an assertion is triggered if an I/O fpage should be
> > mapped while the application has already mapped parts of that I/O
> > fpage, for example
> >
> >   1. I/O fault port=0xcfb size=1  =>  map I/O flexpage  (ok)
> >   2. I/O fault port=0xcf8 size=4  =>  map I/O flexpage
> >
> > At this point a kernel assertion is triggered:
> >
> > Assertion isize > newsize failed in
> > file /home/fm3/src/pistachio/kernel/src/generic/vrt.cc, line 346
> > (fn=f01029b1)
> >
> > Any ideas?
>
> Actually.  I just realized that there were a number of pending fixes
> to the vrt stuff from a long time ago that I had forgot to committ.
> Have committed it now (together with a lot of other stuff).

Sorry for the delay. I just updated Pistachio from CVS including your latest
fixes. Same problem. Enabled VRT_MAP and VRT_MAPCTRL:

ROOT: I/O fault from 8.00 port=0cfb size=01 ip=00447abc
ROOT: Sending ports 0cfb-0cfb to task #08
io<f0352040>::map (fp=0cfb0026 [00000cfb,0] base=00000cfb) to io<f0352060> 
(fp=00004020 [00000000,16])
ROOT: I/O fault from 8.00 port=0cf8 size=04 ip=00447ac4
ROOT: Sending ports 0cf8-0cfb to task #08
io<f0352040>::map (fp=0cf80826 [00000cf8,2] base=00000cf8) to io<f0352060> 
(fp=00004020 [00000000,16])
Assertion isize > newsize failed in 
file /home-sarge/fm3/src/afterburner/extern/pistachio/kernel/src/generic/vrt.cc, 
line 346 (fn=f0303151)

Another thing I observed is that although my privileged root task received
the whole I/O space (ports 0...0xffff), ports 0..0xff don't occur in the
'I' listing of the mapping database and accessing a port of that range raises
a page fault. MR2 was 00004027 after the IPC to Sigma0 -- seems ok.

Frank
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