Messages in this thread | | | From | Roland McGrath <> | Subject | Re: [RFC] x86: xsave/xrstor support, ucontext_t extensions | Date | Thu, 22 May 2008 19:12:22 -0700 (PDT) |
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> hmm.. so the kernel needs to export all the cpuid info (that the kernel > enables and supports) to the user through some mechanism then?
For a cheap interface, we use AT_HWCAP for this. Unfortunately that only covers the first 32 bits of CPUID info. (For another cheap interface, giving all the CPUID bits in the vDSO would be easy.)
For a clunky interface that already exists and is "simple" to use, there is /dev/cpu/0/cpuid now. I wonder if having a device node and opening it too much for applications that consider the vDSO too complex.
Thanks, Roland
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