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Re: memory for exception vectors

To: Jun Sun <>
Subject: Re: memory for exception vectors
From: Ladislav Michl <>
Date: Tue, 13 May 2003 18:11:52 +0100
In-reply-to: <>; from on Tue, May 13, 2003 at 09:52:44AM -0700
Original-recipient: rfc822;
References: <> <> <> <>
User-agent: Mutt/
On Tue, May 13, 2003 at 09:52:44AM -0700, Jun Sun wrote:
> I figured that out a while back.  I think you can find answers in
> arch/mips/kernel/setup.c, 
>       start_pfn = PFN_UP(__pa(&_end));

Strange I read that file many times, but for yet unknown reason never noticed
__pa(&_end). That's what I call selective blindness :)

> I think zero pages are allocated so that all future read-only zero-filled
> pages can be mapped to them.  They are allocated at the beginning of
> start_pfn, which is also after kernel image.

Thanks a lot for explanation, now I'm sure that MC based memory probing for
IP22 will not break anything. Patch will come tomorrow.


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