synchronize
Bring IOMemoryDescriptor and IODMACommand buffers into sync.
Declaration
virtual IOReturn synchronize(
IOOptionBitsoptions);Parameters
- options:
Specifies the direction of the copy: kIODirectionOut copy IOMemoryDesciptor memory to any IODMACommand buffers. By default this action takes place automatically at prepare(). kIODirectionIn copy any IODMACommand buffers back to the IOMemoryDescriptor. By default this action takes place automatically at complete(). kForceDoubleBuffer copy the entire prepared range to a new page aligned buffer.
Return Value
kIOReturnNotReady if not prepared, kIOReturnBadArgument if invalid options are passed, kIOReturnSuccess otherwise.
Overview
This method should not be called unless a prepare was previously issued. If needed a caller may synchronize any IODMACommand buffers with the original IOMemoryDescriptor buffers.