Date: Sun, 28 Feb 2010 00:01:32 +0100 (CET)
From: Alexander Best <alexbestms@wwu.de>
To: Ed Schouten <ed@80386.nl>
Cc: freebsd-hackers@FreeBSD.org
Subject: Re: [patch] extending {amd64|i386} cpu info
Message-ID: <permail-20100227230132f0889e8400005cd0-a_best01@message-id.uni-muenster.de>
In-Reply-To: <20100227223524.GU8200@hoeg.nl>
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hmm...i guess the person who added the CPUID_TO_* macros to
/usr/include/machine/specialreg.h thought a CPUID_TO_STEPPING macro wasn't
necessary since getting the stepping from cpu_id can be done fairly easy
without any shifting and such.
a CPUID_TO_STEPPING macro would look something like this:
#define CPUID_TO_STEPPING(id) \
((id) & CPUID_STEPPING)
getting the model and family however is more complicated since you have to
combine CPUID_{MODEL|FAMILY} and CPUID_EXT_{MODEL|FAMILY}.
cheers.
alex
Ed Schouten schrieb am 2010-02-27:
> Hello Alexander,
> * Alexander Best <alexbestms@wwu.de> wrote:
> > + printf(" Stepping = %u"
> > + " Model = %u"
> > + " Family = %u",
> > + cpu_id & CPUID_STEPPING,
> > + CPUID_TO_MODEL(cpu_id),
> > + CPUID_TO_FAMILY(cpu_id));
> So is there some reason why we don't have a CPUID_TO_STEPPING()?
> Greetings,
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