TCX fixed, SMP mode

[Blue Swirl]

I fixed the TCX mapping problem and added SMP support from Proll.

SMP is not working fully (neither was Proll), probably some problem with 
Qemu. I think earlier it worked. The idea is to send a soft interrupt to a 
halted CPU, which then awakes and begins execution. Now the CPU gets the 
interrupt  (Qemu monitor commands info pic, info cpus confirm this) but it 
does not awaken.

Now the only missing functionality that Proll had is TFTP booting support. 
It could be possible to reuse Proll's slirp stack, but I'm not sure if it is 
worth the trouble. In Qemu environment booting from network is not that 
useful, because you can preload the kernel.

Otherwise OpenBIOS matches or exceeds Proll's capabilities. I'll propose 
switching to OpenBIOS to Qemu developers.

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