=> R2 = pointer to IDE controller
R3 = pointer to interrupt status of controller
R4 = AND with status, NE => IRQ
R5 = pointer to interrupt mask
R6 = OR into mask enables IRQ
R7 = pointer to data read routine (0 for default)
R8 = pointer to data write routine (0 for default)
R12 = pointer to static workspace
<= All registers preserved
This call gives the IDE driver the details of an alternative controller.
See PRM 2, page 293.
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