Messages in this thread |  | | Date | Sun, 30 Aug 2009 13:48:49 -0700 | From | "H. Peter Anvin" <> | Subject | Re: [PATCH 3/3] x86, AMD: Disable wrongly set X86_FEATURE_LAHF_LM CPUID bit |
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On 08/30/2009 01:29 PM, Borislav Petkov wrote: > > Ok, what do we want actually? We have rdmsr_safe and rdmsrl_safe where > the last one engineers the 2 u32s into a u64. My gut feeling would opt > for the 2 32bit values instead of one 64bit since they're naturally > returned into %eax:%edx. And in the most cases we need only one of the > values. However, the MSRs themselves are 64bit... Hmmm... >
The 2x32 bit interface is the legacy interface. It turned out to be a bad idea, but it's hard to clean up all the users.
-hpa
-- H. Peter Anvin, Intel Open Source Technology Center I work for Intel. I don't speak on their behalf.
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