[ipxe-devel] cpuid-flags in cpuid.h maybe incomplete?

Oliver Rath rath at mglug.de
Sat Apr 19 09:53:26 BST 2014


Hi list,

I try to test some flag in ipxe script. If i see right (depending on
https://git.ipxe.org/mirror/memtest.git/blame/1abd405570a2692adcc3bef3845bfb9178a1d952:/cpuid.h),
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?

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.

Tfh!

Oliver

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