From: "H. Peter Anvin" <hpa@zytor.com>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Booting a modular kernel through a multiple streams file / Making Linux multiboot capable and grub loading kernel modules at boot time.
Date: Thu, 20 Dec 2001 10:35:48 -0800 [thread overview]
Message-ID: <3C222F84.4060509@zytor.com> (raw)
In-Reply-To: <200112181605.KAA00820@tomcat.admin.navo.hpc.mil> <m18zbzwp34.fsf@frodo.biederman.org> <3C205FBC.60307@zytor.com> <m1zo4fursh.fsf@frodo.biederman.org> <9vrlef$mat$1@cesium.transmeta.com> <m1r8pqv1w3.fsf@frodo.biederman.org> <3C218BF3.6010603@zytor.com> <m1n10dvobd.fsf@frodo.biederman.org>
Eric W. Biederman wrote:
>
> Agreed. And to completely dispel the myth. Etherboot has been doing
> something similar for years. It disables interrupts in 32bit mode so
> it doesn't have quite as much work to do but otherwise it is pretty
> much the same picture.
>
If you disable interrupts in 32-bit mode a lot of things will not work.
> I finally tracked down the reason why Setup.S is run in real mode,
> instead of being called from protected mode. And that is in extremely
> hostile environments (like loadlin works in) loading the kernel wrecks
> the firmware callbacks. So you must do your BIOS calls as a special
> case before you switch to protected mode.
No, it's because it was easier to do it that way -- do all BIOS calls
once and for all in the early part of the execution of the kernel, and
then forget about it.
-hpa
next prev parent reply other threads:[~2001-12-20 18:36 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-12-18 16:05 Booting a modular kernel through a multiple streams file / Making Linux multiboot capable and grub loading kernel modules at boot time Jesse Pollard
[not found] ` <m1r8prwuv7.fsf@frodo.biederman.org>
[not found] ` <3C204282.3000504@zytor.com>
[not found] ` <m1itb3wsld.fsf@frodo.biederman.org>
[not found] ` <3C2052C0.2010700@zytor.com>
2001-12-19 9:12 ` Eric W. Biederman
2001-12-19 9:37 ` H. Peter Anvin
2001-12-19 15:57 ` Eric W. Biederman
2001-12-20 3:20 ` H. Peter Anvin
2001-12-20 6:31 ` Eric W. Biederman
2001-12-20 6:57 ` H. Peter Anvin
2001-12-20 16:39 ` Eric W. Biederman
2001-12-20 18:35 ` H. Peter Anvin [this message]
2001-12-21 16:57 ` Eric W. Biederman
-- strict thread matches above, loose matches on Subject: below --
2001-12-17 22:10 Booting a modular kernel through a multiple streams file Grover, Andrew
2001-12-18 15:26 ` Booting a modular kernel through a multiple streams file / Making Linux multiboot capable and grub loading kernel modules at boot time Christian Koenig
2001-12-18 18:32 ` H. Peter Anvin
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