automatic switching FastCPU vs. SafeCPU?

[regular]

There are three different CPU implementations. The SMP one I think is not really stable (gets more unstable when the numbers of core increase)
Is the FastCPU actually unsafe? i.e. is there a scenario where it fails? (a certain browser environment for example). If so, would it be possible to detect that failure and switch to the safe cpu?

My feeling so far: the FastCPU is stable and safe.

[s-macke]

Yes, the SMP one is not really stable yet. I don't know why, but have some ideas to find the error.
The slow CPU is the reference, in which the CPU is implemented like in the specification. I don't care about speed.

The fast CPU is optimized for the code it executes.

• flags are never used and therefore omitted
• timing might not be exact (Check for an interrupt for example)
• use my own implementation of the MMU
• use of hardware TLB refill. (This is the biggest change, because it needs a kernel patch)

So let's say, as long as you don't program anything in assembler or change significant parts in the kernel code, you will never see an error.

I should rename the file, that it is clear, that this is the reference CPU.