[Date Prev][Date Next][Thread Prev][Thread Next]
[Date Index]
[Thread Index]
- Subject: Re: Integer subtype and NaN trick
- From: Tim Hill <drtimhill@...>
- Date: Sun, 16 Jun 2013 16:02:31 -0700
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
