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

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Date:	Tue, 22 Jan 2008 11:05:09 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	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.


* H. Peter Anvin <hpa@...or.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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