prepare
Prepare the memory for an I/O transfer.
Declaration
virtual IOReturn prepare(
IODirection forDirection = forDirection);Parameters
- forDirection:
The direction of the I/O to be performed, or kIODirectionNone for the direction specified by the memory descriptor.
Return Value
An IOReturn code.
Overview
This involves paging in the memory, if necessary, and wiring it down for the duration of the transfer. The complete() method completes the processing of the memory after the I/O transfer finishes. This method need not called for non-pageable memory.