On Thu, Sep 15, 2011 at 12:32 PM, K. Macy <km...@freebsd.org> wrote:
[...]
> sys/x86/cpufreq/est.c:1008
>
> /* Attempt to enable SpeedStep if not currently enabled. */
> msr = rdmsr(MSR_MISC_ENABLE);
> if ((msr & MSR_SS_ENABLE) == 0) {
> wrmsr(MSR_MISC_ENABLE, msr | MSR_SS_ENABLE);
> if (bootverbose)
> device_printf(dev, "enabling SpeedStep\n");
>
> /* Check if the enable failed. */
> msr = rdmsr(MSR_MISC_ENABLE);
> if ((msr & MSR_SS_ENABLE) == 0) {
> device_printf(dev, "failed to enable SpeedStep\n");
> return (ENXIO);
Looking at the Intel® 64 and IA-32 Architectures Software Developers
Manual (section 14.1), I think the code here is right?
(I'd expect Linux do the same since the code are mostly the same there).
Cheers,
--
Xin LI <delp...@delphij.net> https://www.delphij.net/
FreeBSD - The Power to Serve! Live free or die
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