What's the accurate meaning of the macro "RTEMS_MULTIPROCESSING" and "RTEMS_SMP"？

[Hailin Guo]

Hi all,
I am porting RTEMS to a multiprocessor CPU whoes architecture is very
non-mainstream. When I read the source, I am confused about the macro
"RTEMS_MULTIPROCESSING" and "RTEMS_SMP". And in the document of RTEMS
Applications C User's Guide, there is also no talk about "RTEMS_SMP".
Who can explain to me about the two macros' meaning? And how does RTEMS
boot from multiprocessor?
Thank you for your answers！
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