Date: Tue, 22 Jan 2008 11:05:09 +0100
From: Ingo Molnar <mingo@elte.hu>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: Andi Kleen <andi@firstfloor.org>, Ian Campbell <ijc@hellion.org.uk>,
       linux-kernel@vger.kernel.org, Thomas Gleixner <tglx@linutronix.de>,
       Ingo Molnar <mingo@redhat.com>,
       "Eric W. Biederman" <ebiederm@xmission.com>
Subject: Re: [PATCH] x86: Construct 32 bit boot time page tables in native
	format.
Message-ID: <20080122100509.GC5722@elte.hu>
References: <1200758937-22386-1-git-send-email-ijc@hellion.org.uk> <1200758937-22386-2-git-send-email-ijc@hellion.org.uk> <87prvxct42.fsf@basil.nowhere.org> <1200847490.26633.62.camel@cthulhu.hellion.org.uk> <20080120173938.GA27247@one.firstfloor.org> <47939787.3050707@zytor.com>
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* H. Peter Anvin <hpa@zytor.com> wrote:

> I was thinking about this yesterday, and it seems to me that there are 
> two cleaner options here...
>
> - either we should put in the full machinery to be able to run C code 
> compiled with -fPIC/-fPIE before paging is enabled.  Unfortunately gcc 
> generates R_386_GOT32 relocations for external references even with 
> -fPIE, so we'll have to put in some code to adjust the GOT (easy 
> enough to do.)

i'd _love_ to have this approach instead of the assembly routines. While 
'constructing pagetables' might not look like a big deal in isolation - 
C is still 10 times more programmable than assembly. Pushing more of the 
early boot code into a sane, non-assembly environment will have positive 
long-term effects all across.

	Ingo
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