linux-kernel - Re: [PATCH] i386: For debugging, make the initial page table setup less forgiving.

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Message-ID: <4620039B.9000608@goop.org>
Date:	Fri, 13 Apr 2007 15:26:35 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Zachary Amsden <zach@...are.com>
CC:	"H. Peter Anvin" <hpa@...or.com>, Andi Kleen <ak@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] i386: For debugging, make the initial page table setup
 less forgiving.

Zachary Amsden wrote:
> H. Peter Anvin wrote:
>> +    /*
>> +     * End condition: we must map up to and including
>> +     * INIT_MAP_BEYOND_END bytes beyond the end of our
>> +     * own page tables; 0x1000 is the size of the page
>> +     * table were about to write, and +0x007 is the
>> +     * attribute bits.
>> +     */
>> +    leal (INIT_MAP_BEYOND_END+0x1000+0x007)(%edi),%ebp
>>   
>
> hrmm?  Shouldn't that still be INIT_MAP_BEYOND_END+0x0007?  Seems you
> are mapping 4M more than you need. 

No, that's an actual byte address of the end of the mapped area, not a pfn.

    J
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