Re: [PATCH 4/4] ntdll: Limit address space to 512GB on ARM64

[André Hentschel]

Am 16.11.2017 um 14:11 schrieb Alexandre Julliard:
> André Hentschel  writes:
> > @@ -1582,7 +1582,9 @@ void virtual_init(void)
> >      assert( !(page_size & page_mask) );
> >      page_shift = 0;
> >      while ((1 << page_shift) != page_size) page_shift++;
> > -#ifdef _WIN64
> > +#ifdef __aarch64__
> > - address_space_limit = (void *)(((1UL << 39) - 1) & ~page_mask);
> >
> > +#elif defined(_WIN64)
> >      address_space_limit = (void *)(((1UL << 47) - 1) & ~page_mask);
> >  #else
> >      address_space_limit = (void *)~page_mask;
>
> Why is this necessary?

512GB is the lowest guaranteed address space limit as per https://www.kernel.org/doc/Documentation/arm64/memory.txt
For the moment that configuration is very common and I would add this until a Windows application needs more