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x86: add linux kernel support for YMM state

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Impact: save/restore Intel-AVX state properly between tasks

Intel Advanced Vector Extensions (AVX) introduce 256-bit vector processing
capability. More about AVX at http://software.intel.com/sites/avx

Add OS support for YMM state management using xsave/xrstor infrastructure
to support AVX.

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
LKML-Reference: <1239402084.27006.8057.camel@localhost.localdomain>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Suresh Siddha
2009-04-10 15:21:24 -07:00
committed by Ingo Molnar
parent 1ee4bd92a7
commit a30469e792
4 changed files with 15 additions and 2 deletions
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arch/x86/kernel/xsave.c
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@@ -324,7 +324,7 @@ void __ref xsave_cntxt_init(void)
}
/*
* for now OS knows only about FP/SSE
* Support only the state known to OS.
*/
pcntxt_mask = pcntxt_mask & XCNTXT_MASK;
xsave_init();