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
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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

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