OSDev.org

Multi-core:

qemu -fda img/pc_app.img -serial stdio -no-reboot -smp 8

I ran also with -smp 2 and 4, with no problems.

Hey guys,
could you recommend some widely accessible resources on SMP initialisation?

You can have access to EPOS: http://epos.lisha.ufsc.br.

It has support for SMP and it is open. You can run it in QEMU or other VM for instance.

And of course, looking at Linux source code too.