x86: use cpuid to check MWAIT support for C1

Browse source

cpuid(0x05) provides extended information about MWAIT in EDX when bit
0 of ECX is set. Bit 4-7 of EDX determine whether MWAIT is supported
for C1. C1E enabled CPUs have these bits set to 0.

Based on an earlier patch from Andi Kleen.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

...

This commit is contained in:

Thomas Gleixner 2008-06-09 18:04:27 +02:00 • committed by Ingo Molnar

parent 732d7be17b

commit 09fd4b4ef5

1 changed files with 20 additions and 8 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

28

arch/x86/kernel/process.c

View file