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Re: NX bit: AMD vs Intel?



On Fri, 2006-03-31 at 17:09 +0300, Gilboa Davara wrote:
> On Fri, 2006-03-31 at 12:56 +0200, Jurgen Kramer wrote:
> > On my Intel system (Xeon with EMT64 support) which runs the 32-bit
> > version of FC5 I can see that NX support is active (from dmesg):
> > 
> > NX (Execute Disable) protection: active
> > 
> > On my other system, a AMD64 system running the 64-bit version of FC4,
> > there is no message regarding NX support being enabled of disabled at
> > all.
> > 
> > Checking init.c in the kernel sources it seems that NX support is
> > depended on PAE support and NX support from the processor. As the AMD
> > processor supports both I aspect to see a NX procection active message
> > on my AMD system as well. Does NX support suppose to work on 64-bit
> > kernels ?
> > 
> > Both systems run kernel 2.6.16.
> > 
> > Jurgen
> > 
> 
> AFAICS, It's activated quietly if present on iAMD64 systems.
> No printk code.
> 
> So, if /proc/cpuinfo includes nx, you're in the clear.
> 
Yep, nx is there. Odd that it is only displayed on Intel systems.

Thanks.

Jurgen



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