=> R0 = addressing mode
R1 = start address in given mode
R2 = number of blocks to read
R3 = pointer to destination buffer
R4 = length of buffer (see note)
R7 = pointer to CDFS control block
This SWI reads data from the CD, using the current mode (see CD_SetParameters and CD_EnquireDataMode).
CD_ReadData R4 value note:
Note for driver writers: the value supplied in R4 may not be valid when CDFS supplies it to the driver entry point.
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