PsiFS_AsyncControl (SWI &520C8) | 
 | Control an asynchronous remote operation | 
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| On entry: | R0 = | reason code | 
 | R1 = | the previously allocated handle for this operation | 
 | Other registers depend on reason code | 
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| On exit: | Registers preserved | 
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| Interrupts: | Interrupt status is undefined Fast interrupts are enabled | 
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| Processor mode: | Processor is in SVC mode | 
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| Re-entrancy: | SWI is not re-entrant | 
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| Use: | 
This call controls a previously started asynchronous remote operation, depending on the reason code in R0. Valid reason codes are:
 | 
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| Related SWIs: | PsiFS_AsyncStart, PsiFS_AsyncEnd, PsiFS_AsyncPoll | 
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| Related vectors: | None |