🚀 go-pugleaf

I've noticed that motorola has moved from instruction continuation
(68010-30) to instruction restart (68040). So they no longer support
virtual machines. (Must be the processors got tired of puking their
insides all over the stack. :-)

Quoting the 68030 manual:

Instruction continuation is used to support virtual I/O devices in
memory-mapped input/output systems. Control and data registers for
the virtual are simulated in the memory map. An access to a virtual
register causes a fault and the function of the register is emulated
by software.

Anybody know why this instruction discontinuation? 

Is virtual machine emulation a lovely idea whose time has come and gone? 

Or does it use too many hardware resources?

I think some (all?) of the risc processors use instruction restart (mips if
I remember correctly) so are we looking at the end of instruction continuation?


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