=> R0 = logical drive number
<= R0 preserved
R1 = physical drive number
The call converts a logical drive number to a physical drive number. You can then use the physical drive number to produce a CDFS control block, which you have to pass when calling CDFSDriver SWIs. The call returns an error if the logical drive is not known.
To construct the control block, allocate a 5-word space for it. Then decode the drive_number given in the above call as follows :
block!0 = (drive_number AND &00000007)
block!4 = ((drive_number >> 3) AND &00000003)
block!8 = ((drive_number >> 5) AND &00000007)
block!12 = ((drive_number >> 8) AND &000000FF)
block!16 = ((drive_number >> 16) AND &0000FFFF)
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