Messages in this thread | | | Date | Tue, 9 Jun 2015 10:23:06 +0200 | From | Peter Zijlstra <> | Subject | Re: [PATCH v2 1/4] x86, mwaitt: add monitorx and mwaitx instruction |
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On Tue, Jun 09, 2015 at 11:13:38AM +0800, Huang Rui wrote: > > MWAITX ECX[1]: enable timer if set > MWAITX EBX[31:0]: max wait time expressed in SW P0 clocks > > The software P0 frequency is the same as the TSC frequency. > > Max timeout = EBX/(TSC frequency)
^ that, would make a lovely comment for this v
> +static inline void __mwaitx(unsigned long eax, unsigned long ebx, > + unsigned long ecx) > +{ > + /* "mwaitx %eax, %ebx, %ecx;" */ > + asm volatile(".byte 0x0f, 0x01, 0xfb;" > + :: "a" (eax), "b" (ebx), "c" (ecx)); > +}
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