=> R1 = &47 (reason code)
<= R1 = 0 to claim, or preserved to pass on
This service is issued by a module running as a backround task (ie. IRQ) that wants to claim the FIQ hardware vector, or a foreground task that wants to poll availability of the vector. If you are the current owner and wish to release the vector, you should do so and signal this by claiming this service.
See PRM 1, page 137
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