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Date: Tue, 09 Jun 2009 19:50:00 -0600
From: 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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> 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).

later,

Peter.