=> R0 = area to read, bit 7 set to read maximum size to R2
<= R0 = pointer to start address of area
R1 = current number of bytes in area
R2 = maximum size of area
This SWI reads the size of an area.
Virtualise If this SWI is used on an area that has virtual memory active this SWI reads the
logical size of the area, otherwise the behaviour is the same as before.
In practice this means that this call can be used by the application
without worrying whether virtual memory is active.
See PRM 1, page 388.
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