self-emulation

created by yerricde

(idea) by yerricde (8.7 mon) (print) ? (I like it!) Fri Oct 27 2000 at 14:31:12

Self-emulation is a technique used to run a computer's programs in a controlled environment on the same computer. There are two ways it can be done:

Full emulation. Each instruction is interpreted. Bochs does this. Machine-level debuggers on machines without privileged instructions do this.
Virtualization of privileged instructions. Instructions are executed natively until a General Protection Fault occurs, which means the program being emulated tried to execute a privileged instruction. This is faster than full emulation; VMWare uses virtualization.

Both methods require some extra random access memory to hold the emulated chip's registers. This means a Transmeta Crusoe can't code-morph into another Crusoe.

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