From: Martin Wilck <martin.wilck@fujitsu-siemens.com>
To: linux-kernel@vger.kernel.org
Cc: Andi Kleen <ak@suse.de>,
"Wichert, Gerhard" <Gerhard.Wichert@fujitsu-siemens.com>,
macro@linux-mips.org
Subject: Re: APIC version and 8-bit APIC IDs
Date: Wed, 31 Aug 2005 16:27:40 +0200 [thread overview]
Message-ID: <4315BE5C.9030809@fujitsu-siemens.com> (raw)
In-Reply-To: <Pine.LNX.4.61L.0508311417110.10940@blysk.ds.pg.gda.pl>
Hi Maciej,
> It actually depends on the APIC type, rather than the CPU. E.g. with
> Pentium systems the width of the ID is either 4 bits or 8 bits,
> depending on whether the integrated or an external 82489DX APIC is
> used. This should be able to be determined by the APIC version; for
> v <= 0xf the ID is 8-bit and for v >= 0x10 it used to be 4-bit. Now
> you only need to determine what is the value of v above 0x10 that
> makes the ID 8-bit again.
That would be v>=0x14 for Intel. But that is wrong for AMD CPUs. The
actual Dual-Core Athlon CPUs we have report an APIC version of 0x10.
Please refer to the start of this thread.
Anyway, I understand that you agree this does not belong into the
subarch code?
Regards
Martin
--
Martin Wilck Phone: +49 5251 8 15113
Fujitsu Siemens Computers Fax: +49 5251 8 20409
Heinz-Nixdorf-Ring 1 mailto:Martin.Wilck@Fujitsu-Siemens.com
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next prev parent reply other threads:[~2005-08-31 14:27 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <42FC8461.2040102@fujitsu-siemens.com.suse.lists.linux.kernel>
2005-08-12 11:43 ` APIC version and 8-bit APIC IDs Andi Kleen
2005-08-12 13:21 ` Martin Wilck
2005-08-12 13:32 ` Andi Kleen
2005-08-12 13:51 ` Martin Wilck
2005-08-12 14:55 ` Martin Wilck
2005-08-12 14:57 ` Andi Kleen
2005-08-12 16:37 ` yhlu
2005-08-12 16:42 ` Andi Kleen
2005-08-12 17:44 ` yhlu
2005-08-22 9:50 ` Martin Wilck
2005-08-23 11:10 ` Maciej W. Rozycki
2005-08-26 14:01 ` Martin Wilck
2005-08-26 14:50 ` Maciej W. Rozycki
2005-08-29 7:25 ` Martin Wilck
2005-08-12 18:19 ` Siddha, Suresh B
2005-08-12 18:22 ` Andi Kleen
2005-08-12 18:40 ` Siddha, Suresh B
2005-08-12 18:50 ` Andi Kleen
2005-08-31 13:13 ` Martin Wilck
2005-08-31 13:25 ` Maciej W. Rozycki
2005-08-31 14:27 ` Martin Wilck [this message]
[not found] ` <4315B2D9.6080700@fujitsu-siemens.com>
[not found] ` <Pine.LNX.4.61L.0508311450020.10940@blysk.ds.pg.gda.pl>
2005-08-31 14:50 ` Martin Wilck
2005-08-31 14:40 ` Andi Kleen
2005-08-12 11:13 Martin Wilck
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