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Date:      Mon, 29 Oct 2001 09:26:59 -0800 (PST)
From:      John Baldwin <jhb@FreeBSD.org>
To:        cameron grant <gandalf@vilnya.demon.co.uk>
Cc:        sobomax@FreeBSD.org, clefevre@citeweb.net, peter@wemm.org, jerry@thehutt.org, freebsd-stable@FreeBSD.ORG, freebsd-current@FreeBSD.ORG
Subject:   Re: adding athlon xp to bsd.cpu.mk
Message-ID:  <XFMail.011029092659.jhb@FreeBSD.org>
In-Reply-To: <002101c16083$6ff87260$0504020a@haveblue>

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On 29-Oct-01 cameron grant wrote:
>> > from what i can see, identcpu.c fetches the cpu name using a cpuid
>> > instruction.
>>
>> The part cpuid gives you is "AuthenticAMD".
>> The fancy name is determined by switching on the Id.
> 
> 
> read identcpu.c.  you are correct for k6 and lesser processors.  the code in
> question is around line 323:
>   do_cpuid(0x80000000, regs);
>   nreg = regs[0];
>   if (nreg >= 0x80000004) {
>    do_cpuid(0x80000002, regs);
>    memcpy(cpu_model, regs, sizeof regs);
>    do_cpuid(0x80000003, regs);
>    memcpy(cpu_model+16, regs, sizeof regs);
>    do_cpuid(0x80000004, regs);
>    memcpy(cpu_model+32, regs, sizeof regs);
>   }
> 
>     -cg

Doh, my bad. :)

/me shuffles off into the corner.. 

-- 

John Baldwin <jhb@FreeBSD.org> -- http://www.FreeBSD.org/~jhb/
PGP Key: http://www.baldwin.cx/~john/pgpkey.asc
"Power Users Use the Power to Serve!"  -  http://www.FreeBSD.org/

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