From: Ralf Baechle <ralf@oss.sgi.com>
To: Rani Assaf <rani@paname.org>
Cc: linux-mips@oss.sgi.com
Subject: Re: Question about r4k_clear_page_xxx()
Date: Thu, 11 Apr 2002 22:04:01 -0700 [thread overview]
Message-ID: <20020411220401.A26953@dea.linux-mips.net> (raw)
In-Reply-To: <20020410041408.G23127@paname.org>; from rani@paname.org on Wed, Apr 10, 2002 at 04:14:08AM +0200
On Wed, Apr 10, 2002 at 04:14:08AM +0200, Rani Assaf wrote:
> I was cleaning duplicate code between my port of IDT RC32355 and the
> current tree. I want to use r4k_clear_page_d16() but the function uses
> store double (sd) which is not available on this processor.
>
> What's the reason for having r4k_clear_page_xxx() use store double and
> not r4k_copy_page_xxx()??
The 32-bit kernel doesn't save or restore the upper 32-bits of general
purpose registers. Therefore 64-bit stores can only be used with the
$zero register.
Ralf
prev parent reply other threads:[~2002-04-12 5:03 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-04-10 2:14 Question about r4k_clear_page_xxx() Rani Assaf
2002-04-10 11:10 ` Florian Lohoff
2002-04-12 5:04 ` Ralf Baechle [this message]
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