> Right, which is why in this code it validates the CPU brand and its
If you can even find out. The system will die silently.
Usually the main culprits are simulators. VMs etc. Most do ignore unknown
MSRs, but not all.
On x86-64 there are two kernel mappings: an early one and a final one.
The final one is only set up in C code.
On 32bit there's only a single one, but it could be changed (e.g.
only add NX later)
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