EM64T supported?

[Chad Leigh -- Shire.Net LLC]

On Nov 17, 2005, at 1:04 PM, Chuck Swiger wrote:

> Marc G. Fournier wrote:
>> First off, what is it?  On 32bit platforms, to address >4G of RAM,  
>> I recall that there is some sort of 'paging' that has to be done  
>> to address it ... does EM64T get around that somehow, or is this  
>> just another name for it?
>
> EM64T uses 64-bit wide registers and addressing, and can talk to  
> >4GB of RAM natively.  Older processors may still support >4GB of  
> physical RAM using the PSE/PSE-36 CPU extensions, but are still  
> using 32-bit registers.

To clarify:

However, if running the x86 version (not amd64) of FreeBSD, EM64T and  
AMD Opteron and Athlon64 chips must use the same PSE type extensions  
to access > 4GB of RAM  if I understand correctly

Chad

>
> -- 
> -Chuck
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Chad Leigh -- Shire.Net LLC
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