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From: Yuhong Bao <yuhongbao_386@hotmail.com>
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Subject: RE: [tip:x86/smap] x86-32: Start out eflags and cr4 clean
Date: Fri, 23 Nov 2012 19:49:29 -0800
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> + * Specifically, cr4 exists if and only if CPUID exists,
> + * which in turn exists if and only if EFLAGS.ID exists.
This may be true for *Intel* 486 CPUs as VME was implemented at the same time as CPUID, but I am not sure that it is true for AMD 486 CPUs.

Yuhong Bao