linux-kernel - Re: MPTable can not be high-memory on Linux

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Message-ID: <20090222225847.GB1649@elte.hu>
Date:	Sun, 22 Feb 2009 23:58:47 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Kevin O'Connor <kevin@...onnor.net>
Cc:	Yinghai Lu <yinghai@...nel.org>, "Rafael J. Wysocki" <rjw@...k.pl>,
	Stefan Reinauer <stepan@...esystems.de>,
	linux-kernel@...r.kernel.org, coreboot@...eboot.org,
	Jaswinder Singh Rajput <jaswinder@...radead.org>
Subject: Re: MPTable can not be high-memory on Linux


* Kevin O'Connor <kevin@...onnor.net> wrote:

> On Sun, Feb 22, 2009 at 01:33:35PM -0800, Yinghai Lu wrote:
> [...]
> > >>>  BIOS-e820: 0000000000090000 - 0000000000100000 (reserved)
> > >>>  BIOS-e820: 0000000000100000 - 000000003f7f0000 (usable)
> > >>>  BIOS-e820: 000000003f7f0000 - 0000000040000000 (reserved)
> [...]
> > >>> found SMP MP-table at [c00f9fc0] 000f9fc0
> [...]
> > 
> > that should work for a long time.
> > 
> > 0xf9fc0 < 1M is quite < max_low_pfn, so wonder why bootmem could panic.
> 
> On this machine the mptable "floating" structure is at 
> 0xf9fc0.  It points to the rest of the table which is in the 
> 0x3f7f0000 area.
> 
> Note, that this is on a Coreboot+SeaBIOS machine - so we can 
> change the bios.  However, the mptable spec does allow for 
> part of the table to be high memory.

yes, and i'd prefer if it worked fine even if it's that high.

	Ingo
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