Recent patches break ACPI tables

[Damien Zammit]

Hi,

Almu and I discovered that the following commit breaks --enable-apic 
--enable-ncpus= >1 --disable-linux-groups
  
* d972c01c pmap: only map lower BIOS memory 1:1 when using Linux drivers

I believe the ACPI tables need temporary low memory mapping to access them.

Also, the commit:

* 54a4ca27 x86_64: fix APIC initialization

seems wrong to me.  From memory, the ACPI spec says the offsets are always 32 
bit for the mode of APIC we are using.

Was there some other reason to make these commits that we haven't thought of?  
Or can they be reverted?

Thanks,
Damien