Pull up following revision(s) (requested by martin in ticket #842):
sys/arch/sparc/stand/ofwboot/loadfile_machdep.c: revision 1.14
sys/arch/sparc/stand/ofwboot/version: revision 1.21
sys/arch/sparc64/include/cpu.h: revision 1.115
sys/arch/sparc64/sparc64/autoconf.c: revision 1.203
sys/arch/sparc64/sparc64/mp_subr.S: revision 1.9 via patch
sys/arch/sparc64/sparc64/pmap.c: revisions 1.295, 1.295 via patch
Fix available length calculation in kvamap_extract when reusing existing
mappings.
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Bump version now that we can load kernels with sizeof(.data)+sizeof(.bss)> 4 MB
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Do not hardcode the assumption that .data and .bss fit together in a single
4 MB page. This allows booting kernels with options USB_DEBUG again.
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Slightly optimize the ITLB usage on secondary processors

(snj)