From: Ben Hoskings <ben@jeeves.bpa.nu>
To: lkml <linux-kernel@vger.kernel.org>
Subject: Re: transmeta cpu code question
Date: Thu, 20 Nov 2003 13:18:17 +1000 [thread overview]
Message-ID: <200311201318.17705.ben@jeeves.bpa.nu> (raw)
In-Reply-To: <20031120025315.GR11983@phunnypharm.org>
EDIT: Oops, meant to reply-all. Apologies Ben.
On Thu, 20 Nov 2003 12:53 pm, Ben Collins wrote:
> You are a bit confused. The cpu_rev is a 4 byte value, each byte is a
> decimal of the revision.
>
> And (0 & 1) makes 1, not 0. That's an AND, not an OR.
I'm willing to put some safe money on (0 & 1) equalling 0.
It has to, for your explanation below to work. :)
>
> Think about it this way. If cpu_rev == 0x01040801, then this would
> produce:
>
> (0x01040801 >> 24 & 0xff) -> (0x01 & 0xff) -> 0x01
>
> (0x01040801 >> 16 & 0xff) -> (0x0104 & 0xff) -> 0x04
>
> (0x01040801 >> 8 & 0xff) -> (0x010408 & 0xff) -> 0x08
>
> (0x01040801 & 0xff) -> 0x01
--
Ben
next prev parent reply other threads:[~2003-11-20 3:18 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-11-20 2:02 transmeta cpu code question Nico Schottelius
2003-11-20 2:10 ` Ben Hoskings
2003-11-20 8:38 ` Nico Schottelius
2003-11-20 17:33 ` H. Peter Anvin
2003-11-20 23:25 ` Jamie Lokier
2003-11-21 8:34 ` John Bradford
2003-11-21 8:48 ` Jamie Lokier
2003-11-24 6:54 ` H. Peter Anvin
2003-11-24 13:19 ` Jamie Lokier
2003-11-20 2:53 ` Ben Collins
2003-11-20 3:06 ` Kevin P. Fleming
2003-11-20 13:25 ` Ben Collins
2003-11-20 3:18 ` Ben Hoskings [this message]
2003-11-20 6:57 ` Eric Sandall
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