i want to porting helenOS on ARM architecture , but currently helenOS does't support SMP on ARM. could you please give me some advise and documents about how to support SMP on ARM?
From the ARM hardware point of view you need to study the relevant CPU and system manuals to understand how to configure and drive the multiprocessor environment. Since you didn't provide any details about your target platform, we cannot provide you with any more specific pointers.
From the HelenOS point of view, examine the directories kernel/generic/src/smp and the SMP directories in kernel/arch/* of the platforms that currently have SMP support. This should give you an idea what is needed to be implemented.
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