linux-kernel - Re: [PATCH] x86: Construct 32 bit boot time page tables in native format.

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Message-ID: <479398D2.1040209@zytor.com>
Date:	Sun, 20 Jan 2008 10:54:10 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Ian Campbell <ijc@...lion.org.uk>, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [PATCH] x86: Construct 32 bit boot time page tables in native
 format.

Andi Kleen wrote:
>>> There are various loaders (kexec, elilo, ...) that skip the 16bit code
>>> and jump directly to 32bit head.S. So in theory those could hit it.
>>> But still having the loop only is probably fine.
>>>
>> It's probably just as well, since we don't really know how to get a 
>> message out in such an environment anyway...
> 
> It would be robably possible to extend the 32bit protocol to some
> way to error out in such a case. On the other hand I'm not sure it's really
> worth the considerable work to implement and debug such an addition.
> 
>>>> variant of make_pte now though.
>>> The 32bit cast still feels unclean. After all the PTE is not 32bit.
>> No, but (pte_t *) is 32 bits.  To be more "Linuxy" it probably should be 
>> (long) or (unsigned long) though.
> 
> That's not 32bit either.

Looked at the subject line?

	-hpa

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