Date: Fri, 10 Oct 2003 06:00:26 -0500 (CDT) From: Mike Silbersack <silby@silby.com> To: Joseph Koshy <jkoshy@FreeBSD.ORG> Cc: freebsd-hackers@freebsd.org Subject: Re: Determining CPU features / cache organization from userland Message-ID: <20031010055857.M1695@odysseus.silby.com> In-Reply-To: <20031010103640.6F5A216A4BF@hub.freebsd.org> References: <20031010103640.6F5A216A4BF@hub.freebsd.org>
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On Fri, 10 Oct 2003, Joseph Koshy wrote: > Hi -hackers, > > I'm looking for ways that a userland program can determine the CPU > features available on an SMP machine -- processor model, stepping > numbers, supported features, cache organization etc. > > For example, on some x86 processors the CPUID instruction could be > used to determine some of these parameters, but using this instruction > in an SMP context is a little tricky since we do not know which CPU > gets to execute the instruction. At least in the Intel world, multiprocessor systems are _always_ supposed to have matching processor steppings, so the reliability of the information should be very good indeed. Mike "Silby" Silbersackhelp
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