=> R0 = minimum address
R1 = maximum address
<= R0,R1 preserved
C flag is clear if the range is OK, set otherwise
SWI checks the address range between R0 and R1-1 to see if the specified range lies in logical RAM and has a mapping into physical RAM.
Note: This does not check that the memory actually exists, only that it ought to exist. If you have used OS_SetMemMapEntries, then this call will not work as expected.
See PRM 1, page 379.
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