[lkml]   [2009]   [Aug]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH 3/3] x86, AMD: Disable wrongly set X86_FEATURE_LAHF_LM CPUID bit
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.


H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.

 \ /
  Last update: 2009-08-30 22:51    [W:0.079 / U:0.616 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site