Re: NX bit: AMD vs Intel?

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On 3/31/06, Jurgen Kramer <gtm.kramer@xxxxxxxxxxxx> wrote:
> 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.

No.  The message is only displayed by the *32-bit* OS.  If you ran
64-bit Fedora on your Intel system, you would not see the message in
that case.  Just to clarify ;).

Jonathan


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