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POWER9BSD Project set up bring powerpc64 to feature & performance parity with amd64

Required features

Completed:

• ifunc support - DONE
• radix mmu pmap -- DONE
• LKPI for graphics DONE
• NUMA DONE

In progress:

• superpages - WIP (mattmacy)
• clang7 support - WIP (bdragon28)
• EARLY_AP_STARTUP - WIP (bdragon28)
• kernel minidump - WIP (mattmacy)
• PMC - WIP (mattmacy)
  • needs NMI semantics
• Lock optimization - WIP (mattmacy)
  • Want to add better adaptive backoff

Near term:

• dtrace
• LE support
• TLS

unscheduled - but planned:

• optimize PWC invalidation vs flush
• bhyve support
• Mtrace support (commuter support)
• BGE iflib (netmap & performance) -- needed for pfSense
• kexec support
• XIVE support