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Thats physical addresses .. I think the poster was talking about virtual addresses (that is, before the virtual address translation).

--Tim

On Jun 16, 2013, at 12:14 AM, Owen Shepherd <owen.shepherd@e43.eu> wrote:

> Coda Highland wrote:
>> 
>> Unless I'm wrong, ASLR isn't restricted to 48 bits. Virtual memory
>> allocation can use whatever addresses it wants.
> 
> 
> The hardware itself is physically limited to 48-bits.  Each page is 4kB, plus there are 4 layers of page tables, bringing the total up to 48 bits.
> 
> The processors throw an exception on a memory access if bits 63-48 don't match bit 47.
> 
> This is all baked into silicon