iokit/Kernel/IODMAEventSource.cpp

51   dmaIndex = 0xFFFFFFFF;
59   result = dmaController->initDMAChannel(dmaProvider, this, &dmaIndex, inDMAIndex);
88   if ((dmaController == 0) || (dmaIndex == 0xFFFFFFFF)) return kIOReturnError;
94   result = dmaController->startDMACommand(dmaIndex, dmaCommand, direction, byteCount, byteOffset);
108   if ((dmaController == 0) || (dmaIndex == 0xFFFFFFFF)) return kIOReturnError;
110   return dmaController->stopDMACommand(dmaIndex, flush, timeout);
116   if ((dmaController == 0) || (dmaIndex == 0xFFFFFFFF)) return kIOReturnError;
118   return dmaController->queryDMACommand(dmaIndex, dmaCommand, transferCount, waitForIdle);
124   if ((dmaController == 0) || (dmaIndex == 0xFFFFFFFF)) return kIOReturnError;
126   return dmaController->getFIFODepth(dmaIndex);