Re: [PATCH -v2 0/4] EFI 1:1 mapping

Matthew Garrett
2013-06-20T18:10:26Z

On Thu, Jun 20, 2013 at 08:08:08PM +0200, Borislav Petkov wrote:
> On Thu, Jun 20, 2013 at 06:12:10PM +0100, Matthew Garrett wrote:
> > On Thu, Jun 20, 2013 at 07:01:24PM +0200, Borislav Petkov wrote:
> >
> > > If we can detect the Macs, we can make this decision automatic. And
> > > since no Mac boots windoze, a single DMI check of the sort "if (Mac)"
> > > should suffice.
> >
> > Yes, we can special-case Macs. But since our behaviour is then obviously
> > different to Windows, we'll inevitably break some other system.
>
> Why different? We'll have the high mappings and shove the 1:1 mappings
> down SetVirtualAddressMap by default.

Because Windows passes high addresses to SetVirtualAddressMap(), and
because if you can imagine firmware developers getting it wrong then
firmware developers will have got it wrong.

--
Matthew Garrett | mjg59@srcf.ucam.org