Re: What's the accurate meaning of the macro "RTEMS_MULTIPROCESSING" and "RTEMS_SMP"？
sebastian.huber at embedded-brains.de
Tue Jul 23 07:33:01 UTC 2013
On 2013-07-23 09:20, Hailin Guo wrote:
> 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?
The RTEMS_MULTIPROCESSING is supported for a long time and is also known as
asymmetric multiprocessing. Here message passing is used to synchronize objects.
The RTEMS_SMP is new to RTEMS and work in progress. One RTEMS instance will
run on multiple processors.
> And how does RTEMS boot
> from multiprocessor?
At the moment there is no documentation for this. The realview_pbx_a9_qemu_smp
BSP runs on the Qemu simulator and has SMP support. You may have a look at the
See also the comments in percpu.h for Per_CPU_State.
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