Re: [patches] [PATCH] [21/22] x86_64: Extend bzImage protocol forrelocatable bzImage

From: Rusty Russell
Date: Sun Apr 29 2007 - 23:03:50 EST

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.
> > 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.

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