Crash on Windriver Simics : page fault, pd='init -> drivers -> acpi_drv' thread='ep'

[Parfait Tokponnon]

Oh sorry, I didn't see it,
Thank you!

Le jeu. 9 juil. 2020 à 17:44, Alexander Boettcher <
alexander.boettcher at genode-labs.com> a écrit :

> On 09.07.20 15:19, Parfait Tokponnon wrote:
> > I commented out the reset_addr line without success. It triggers a page
> > fault at another address.
>
> I wrote to remove all _3_ lines with reset_* to avoid the pagefault, not
> only 1 line ;-)
>
> > Applying the patch reveals the following about the 'FACP' table structure
> > just before the page fault
> >
> >> [init -> drivers -> acpi_drv] Warning: attach memory -
> 0x3feff000+0x1000,
> >> Loop_base 0x7feff000, IO base 1073741824
> >> [init -> drivers -> acpi_drv] table mapped 'FACP' at 0xbfefff80 (from
> >> 0x7fefff80) size 0x74
>
> As I pressumed, the table is solely 0x74 in size. Looking at the code:
>
>  253 .   .   reset_type  = read<Fadt::Reset_reg_type>();
>
>  254 .   .   reset_addr  = read<Fadt::Reset_reg_addr>();
>
>  255 .   .   reset_value = read<Fadt::Reset_value>();
>
>  256 .   }
>
>  257
>
>  258 .   struct Dsdt           : Register<0x28, 32> { };
>
>  259 .   struct Feature_flags  : Register<0x70, 32> { };
>
>  260 .   struct Reset_reg_type : Register<0x74, 32> { };
>
>  261 .   struct Reset_reg_addr : Register<0x78, 64> { };
>
>  262 .   struct Reset_value    : Register<0x80, 8>  { };
>
> you see that the Reset_* types are behind the tables, namely at offset
> 0x74, 0x78, 0x80.
>
> Do you like to open an issue and provide a patch ?
>
> May be, it is tempting!

> Thanks for investigation,
>
> Alex.
>
> >>
> >> Since the reset values are not used anywhere in the code, you could just
> >> comment out the 3 lines and you should get further.
> >>
>
> --
> Alexander Boettcher
> Genode Labs
>
> https://www.genode-labs.com - https://www.genode.org
>
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-- 
Parfait T.
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