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=>     R0 =     reason code
     R1 =     internal file handle returned by FSEntry_Open
     others dependant on call

This entry point is called when control operations are performed on open files.
FSEntry_Args reason codes
Reason     Meaning

0     Read sequential pointer
1     Write sequential pointer
2     Read file extent
3     Write file extent
4     Read size allocated to file
5     Check for EOF
6     Flush modified data
7     Ensure file size
8     Zero pad file
9     Read datestamp
10     Update image stamp
11     IOCtl

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