[ipxe-devel] cpuid-flags in cpuid.h maybe incomplete?
mcb30 at ipxe.org
Sun Apr 20 21:09:47 BST 2014
On 19/04/14 09:53, Oliver Rath wrote:
> I try to test some flag in ipxe script. If i see right (depending on
> the following flag are recognized in this way:
> cpuid --ext 6 = PAE Support
> cpuid 26 = SSE2 Support
> cpuid --ext 20 = NX Support
> Is this correct?
You can follow the links on http://ipxe.org/cmd/cpuid to get the full
list of x86 CPUID flags. The "cpuid" command doesn't understand what
the flags mean; it just provides a way to test numbered bits of the flags.
> Reffering the cpuid.h file line 166 = bit 0, line 196 = bit 31, but
> 166+31=197, so there seems one bit omitted, but Im not sure, that Im
> allowed to relate in this way.
Observe line 184.
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