[OpenBIOS] SPARC32 : SMP

[Olivier Danet]

I splitted the patch.

It was tested with an old Linux distro (RH 4.2) and with NetBSD.
The SMP kernel must be selected during install.

Here is, for example, a NetBSD/sparc32 image with SMP enabled :

temlib.org/pub/net702.qcow.bz2

qemu-system-sparc net702.qcow  -M SS-20 -vga cg3 -smp 2

This SMP mode used to work a while ago, but it has so far no practical purpose as enabling it slows down QEMU considerably.