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Date: Wed, 17 Jun 2009 12:55:52 -1000 (HST)
From: Jeff Roberson <jroberson@jroberson.net>
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To: Peter Grehan <grehan@freebsd.org>
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Cc: arch@freebsd.org, Marius Strobl <marius@alchemy.franken.de>
Subject: Re: Dynamic pcpu, arm, mips, powerpc, sun, etc. help needed
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On Tue, 9 Jun 2009, Peter Grehan wrote:

>> As for sparc64 allocating the storage for the dynamic area
>> from end probably isn't a good idea as the pmap code assumes
>> that the range from KERNBASE to end is covered by the pages
>> allocated by and locked into the TLB for the kernel by the
>> loader
>
> Ditto for ppc. It's possible to get the additional space from within or 
> after return from pmap_bootstrap() (like thread0's kstack, or the msgbuf).

http://people.freebsd.org/~jeff/dpcpu.diff

I have updated this patch based on feedback relating to various 
architectures md code.  I tried to model most architectures after the way 
msgbuf memory was taken.  I have no capacity to test anything other than 
i386 and amd64.  ARM is reported to work with one minor diff.  Apparently 
sparc64 worked with the earlier diff but this should be cleaner.  If 
anyone can report back on sparc64, mips, or powerpc, I'd appreciate it.

Thanks,
Jeff

>
> later,
>
> Peter.
>