* R0 = Operation to perform:
0 Suspend full screen mode
1 Freeze running in a window
2 Reset the PC
3 Quit the front-end
* All registers preserved.
Purpose: Control the PC front-end.
Interrupts: Interrupt status is undefined.
Fast interrupts are enabled.
Processor mode: Processor is in SVC mode.
Re-entrancy: SWI is not re-entrant.
Use: This call allows the PC front-end to be controlled. Note that if the PC front-end is not the current application then this will only take effect the next time the front-end is paged in.
Note that suspending full screen mode only starts execution in a window if enabled by the current configuration.
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