From: Matthew Wilcox <willy@debian.org>
To: Grant Grundler <grundler@puffin.external.hp.com>
Cc: Matthew Wilcox <willy@debian.org>, parisc-linux@parisc-linux.org
Subject: Re: [parisc-linux] I think WAX is broken
Date: Mon, 9 Jul 2001 02:30:48 +0100 [thread overview]
Message-ID: <20010709023048.S6103@parcelfarce.linux.theplanet.co.uk> (raw)
In-Reply-To: <200107090103.TAA09348@puffin.external.hp.com>; from grundler@puffin.external.hp.com on Sun, Jul 08, 2001 at 07:03:20PM -0600
On Sun, Jul 08, 2001 at 07:03:20PM -0600, Grant Grundler wrote:
> Hey! that's mine! :^P
It's still obscure. I know x86 does something similar, and I think it's
obfuscated too.
> Someone needs to understand what "((addr & 0xfc00) >> 6)" does.
> It looks like it overlaps with "((addr & 0x03f8) << 9)".
fc00 >> 6 = 3f0
03f8 << 9 = 7f000
7 = 7
1111'1100'0000'0000 -> 0000'0000'0011'1111'0000
0000'0011'1111'1000 -> 0111'1111'0000'0000'0000
0000'0000'0000'0111 -> 0000'0000'0000'0000'0111
1111'1111'1111'1111 -> 0111'1111'0011'1111'0111
Icky. And it means we can't do away with the function calls for inb/outb.
*sigh*.
--
Revolutions do not require corporate support.
prev parent reply other threads:[~2001-07-09 1:30 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-07-08 23:44 [parisc-linux] I think WAX is broken Matthew Wilcox
2001-07-09 1:03 ` Grant Grundler
2001-07-09 1:30 ` Matthew Wilcox [this message]
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