linux-kernel - Re: [patches] [PATCH] [21/22] x86_64: Extend bzImage protocol for relocatable bzImage

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Date:	Mon, 30 Apr 2007 13:03:15 +1000
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>,
	Jeff Garzik <jeff@...zik.org>, Andi Kleen <ak@...e.de>,
	patches@...-64.org, Vivek Goyal <vgoyal@...ibm.com>,
	linux-kernel@...r.kernel.org, "H. Peter Anvin" <hpa@...or.com>,
	virtualization <virtualization@...ts.linux-foundation.org>
Subject: Re: [patches] [PATCH] [21/22] x86_64: Extend bzImage protocol for
	relocatable bzImage

On Sun, 2007-04-29 at 09:11 -0600, Eric W. Biederman wrote:
>   Right now I'm a little frustrated that insanity below slipped into
>   head.S right after the 32bit entry point after the review said
>   use the normal linux parameters for parameter passing.
>   
>   > #ifdef CONFIG_PARAVIRT
>   >         movl %cs, %eax
>   >         testl $0x3, %eax
>   >         jnz startup_paravirt
>   > #endif
>   
>   The whole thing should be based on a value in the linux parameter block
>   pointed to by %esi, instead of the insane preserve all registers and
>   attempt to be super compatible with everyone.

Dammit, Eric, you spend a lot of time using words like "insane" where
you mean we didn't do everything all at once.

It's *not* clear that using %esi is sane, but nothing in the current
code prevents that.

I was trying to get Xen to use this entry point rather than their own: I
failed, and only lguest now uses it.

Fortunately, this also means it's trivial to change.
Rusty.

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