- Use atomics to adjust the pmap reference count, instead of taking locks.
- Implement I386_{SET,GET}_{FS,GS}BASE, allowing %fs and %gs to be used
as per-thread registers. This is compatible with FreeBSD.
- Run patches after we have attached CPUs, since we then know if the
system is uniprocessor or not. Eliminates a lot of #ifdef MULTIPROCESSOR
and makes running MP kernels on UP systems cheaper.
- Patch out many of the 'lock' prefixes to nops if uniprocessor.
- Do a wbinvd after patching to ensure that the trace/instruction cache
is up to date.
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