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Date:	Sun, 28 Oct 2007 08:36:02 -0400
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From:	DJ Delorie <dj AT delorie DOT com>
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Subject:	Re: Using inline asm
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> 	asm("cpuid" : "=a" (eax) : "a" (level)
> 		: "ebx", "ecx", "edx");

I don't think you can use the same register as input and output, you
have to use a matching constraint:

> 	asm("cpuid" : "=a" (eax) : "0" (level)
> 		: "ebx", "ecx", "edx");

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