Re: r343567 aka PAE vs non-PAE merge breaks i386 freebsd

On Sun, Feb 24, 2019 at 10:58 AM Steve Kargl <
sgk_at_troutmask.apl.washington.edu> wrote:

> On Sun, Feb 24, 2019 at 10:06:53AM -0700, Warner Losh wrote:
> > >
> >
> > Maybe I missed it, but Steve, did you run the patched in a different way
> > tests that I suggested? Replacing the limits with 0xffffffff for testing
> > purposes to ensure that drm isn't saying it can cope with larger
> addresses?
> > That might help narrow down what the problem here one more level than
> "It's
> > PAE".
> >
>
> So, I dug through the code a bit.  Niclas changed the port to
> use BUS_SPACE_MAXADDR.  This is defined in include/x86/bus.h
>
> #if defined(__amd64__) || defined(PAE)
> #define BUS_SPACE_MAXADDR_48BIT 0xFFFFFFFFFFFFULL
> #define BUS_SPACE_MAXADDR       0xFFFFFFFFFFFFFFFFULL
> #else
> #define BUS_SPACE_MAXADDR       0xFFFFFFFF
> #endif
>
> I don't know if defined(PAE) is effected by hw.above4g_allow,
> or where it gets defined or if it is defined.
>

Grepping suggests that PAE isn't defined w/o the option. The option is only
in the PAE kernel, so maybe my test wouldn't say anything useful and it's a
different issue.

Warner