RFC: Patches with AXP support and pmap&smp fixes.

[Ian Lepore]

On Mon, 2013-04-29 at 16:39 +0200, Grzegorz Bernacki wrote:
> Hi,
> 
> I am going to submit some changes related to Armada XP support and some 
> general ARM fixes. You can find them at:
> http://people.freebsd.org/~gber/armada
> 
> It would be good if someone could review changes in generic ARM code i.e.:
> 1)
> http://people.freebsd.org/~gber/armada/0004-arm-smp-Fix-AP-processors-initialization-procedure.patch
> 
> This patch fixes race condition in pcpu_init function. pcpu_init 
> performs operation on signly-linked tail queue and the queue can be 
> corrupted by secondary cpus initialization.
> 
> 2)
> http://people.freebsd.org/~gber/armada/0007-arm-Fix-L2-PTE-access-permissions-management.patch
> http://people.freebsd.org/~gber/armada/0008-arm-Fix-page-reference-emulation-on-ARMv6-and-v7.patch
> 
> These are changes which fixes reference simulation and access 
> permissions in pmap v6.
> 
> It would be great if you could also review armada patches.
> We will appreciate all comments and remarks. If there will be no 
> objections I am going to submit these changes at the beginning of the 
> next week.
> 
> thanks,
> greg

I've reviewed them, and see no problems.  It might not be a bad idea to
paste the protections truth table from the commit message as a comment
block in pmap_set_prot(); I had to keep referring to it while convincing
myself the changes were right for every path through the routine.

-- Ian