Messages in this thread | | | Subject | Re: [PATCH] Mutilated form of Andi Kleen's AMD prefetch errata patch | From | Andi Kleen <> | Date | 30 Sep 2003 21:08:01 +0200 |
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Dave Jones <davej@redhat.com> writes: > > > Anyway, it should complain about lack of cmov not crash :) > > not easy, given we execute cmov instructions before we even hit > a printk. Such a test & output needs to be done in assembly in early > startup.
I implemented it for long mode on x86-64.
It has to be done before the vesafb is initialized too, otherwise you cannot see the error message.
You could copy the code from arch/x86_64/boot/setup.S (starting with /* check for long mode. */) and change it to check for the CPUID bits you want. x86-64 checks a basic collection that has been determined to be the base set of x86-64 supporting CPUs. But it could be less or more.
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