Date: Mon, 22 Nov 2010 07:55:01 -0500 From: John Baldwin <jhb@freebsd.org> To: freebsd-current@freebsd.org Cc: freebsd-hackers@freebsd.org, Andriy Gapon <avg@freebsd.org> Subject: Re: new cpuid bits Message-ID: <201011220755.01894.jhb@freebsd.org> In-Reply-To: <4CE69A49.4080801@freebsd.org> References: <4CE69A49.4080801@freebsd.org>
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On Friday, November 19, 2010 10:39:53 am Andriy Gapon wrote: > > Guys, > > I would like to add definitions for couple more useful CPUID bits, but I am > greatly confused about how to name them. > I failed to deduce the naming convention from the existing definitions and I am > not sure how to make the names proper and descriptive. > > The bits in question are returned by CPUID.6 in EAX and ECX. > CPUID.6 block is described by both AMD and Intel as "Thermal and Power Management > (Leaf)". Bits in EAX are defined only for Intel at present, the bit in ECX is > defined for both. > > Description/naming of the bits from the specifications: > EAX[0]: Digital temperature sensor is supported if set > EAX[1]: Intel Turbo Boost Technology Available > EAX[2]: ARAT. APIC-Timer-always-running feature is supported if set. > ECX[0]: > Intel: Hardware Coordination Feedback Capability (Presence of Bits MCNT and ACNT > MSRs). > AMD: EffFreq: effective frequency interface. > > How does the following look to you? > I will appreciate suggestions/comments. Looks fine to me. -- John Baldwin
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