=> R0 = Pointer to zero terminated filter name
R1 = Addresss of filter code
R2 = Value to be passed in R12
R3 = Task handle of task to which filter is applied, or 0 for all tasks
R4 = Event mask (1 bit masks the event out as for Wimp_Poll)
<= all registers preserved
This SWI adds a new post filter to the list of post filters. Whenever the Wimp is about to return from Wimp_Poll to the task with handle specified by R3, the address pointed to by R1 will be called, with R12 set to the value given in R2 when the filter was registered.
See PRM 3, page 308.
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