From: "H. Peter Anvin" <hpa@zytor.com>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: BOOT_CS
Date: Sun, 22 Feb 2004 11:47:37 -0800 [thread overview]
Message-ID: <40390759.2020201@zytor.com> (raw)
In-Reply-To: <m1znbbjgfz.fsf@ebiederm.dsl.xmission.com>
Eric W. Biederman wrote:
> hpa@zytor.com (H. Peter Anvin) writes:
>
>>Anyone happen to know of any legitimate reason not to reload %cs in
>>head.S?
>
> Other than the fact it is strongly rude and error prone to depend on
> the contents of a global descriptor table you did not setup?
>
We already do that, as you might have noticed (we set all the data
registers to __BOOT_DS; CS is the only that is changed.)
>
> That is almost nice. Care to export where the bottom of the page
> tables or even better where the bottom of the kernel is for those
> folks who want to place their ramdisk as low in memory as possible?
>
The problem is that you don't know until it's too late, since it can
depend on dynamic factors. This is part of why your insistence of
putting the ramdisk in the "most incorrect" position is simply wrong.
-hpa
next prev parent reply other threads:[~2004-02-22 19:47 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-02-21 5:47 BOOT_CS H. Peter Anvin
2004-02-21 12:43 ` BOOT_CS Coywolf Qi Hunt
2004-02-21 16:32 ` BOOT_CS Jamie Lokier
2004-02-23 4:43 ` [PATCH] BOOT_CS Coywolf Qi Hunt
2004-02-23 14:30 ` Jamie Lokier
2004-02-23 15:24 ` Rene Herman
2004-02-24 3:11 ` [PATCH] Remove the extra jmp Coywolf Qi Hunt
2004-02-24 3:30 ` Brian Gerst
2004-02-24 10:10 ` Coywolf Qi Hunt
2004-02-22 15:13 ` BOOT_CS Eric W. Biederman
2004-02-22 19:47 ` H. Peter Anvin [this message]
2004-02-22 22:05 ` BOOT_CS Eric W. Biederman
2004-02-23 10:27 ` Does Flushing the Queue after PG REALLY a Necessity? Coywolf Qi Hunt
2004-02-23 15:18 ` Philippe Elie
2004-02-24 2:36 ` Coywolf Qi Hunt
2004-02-24 3:10 ` H. Peter Anvin
2004-02-24 4:55 ` Randy.Dunlap
2004-02-24 9:17 ` Coywolf Qi Hunt
2004-02-24 11:21 ` Herbert Poetzl
2004-02-24 11:33 ` Coywolf Qi Hunt
-- strict thread matches above, loose matches on Subject: below --
2004-02-24 10:05 BOOT_CS Etienne Lorrain
2004-02-24 15:39 ` BOOT_CS H. Peter Anvin
2004-02-25 10:30 BOOT_CS Etienne Lorrain
2004-02-25 16:23 ` BOOT_CS H. Peter Anvin
2004-02-26 12:17 BOOT_CS Etienne Lorrain
2004-02-26 21:49 ` BOOT_CS Denis Vlasenko
2004-02-27 10:03 ` BOOT_CS Etienne Lorrain
2004-02-27 18:41 ` BOOT_CS H. Peter Anvin
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