--- /dev/null
+++ xnu/xnu-8792.61.2/iokit/Kernel/IODMAEventSource.cpp
@@ -0,0 +1,261 @@
+/*
+ * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
+ *
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
+ *
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
+ */
+
+#define IOKIT_ENABLE_SHARED_PTR
+
+#include <IOKit/IODMAEventSource.h>
+#include <IOKit/IOService.h>
+
+#include "IOKitKernelInternal.h"
+
+
+#define super IOEventSource
+OSDefineMetaClassAndStructors(IODMAEventSource, IOEventSource);
+
+bool
+IODMAEventSource::init(OSObject *inOwner,
+    IOService *inProvider,
+    Action inCompletion,
+    Action inNotification,
+    UInt32 inDMAIndex)
+{
+	IOReturn result;
+
+	if (!super::init(inOwner)) {
+		return false;
+	}
+
+	if (inProvider == NULL) {
+		return false;
+	}
+
+	dmaProvider = inProvider;
+	dmaIndex = 0xFFFFFFFF;
+	dmaCompletionAction = inCompletion;
+	dmaNotificationAction = inNotification;
+
+	dmaController.reset(IODMAController::getController(dmaProvider, inDMAIndex), OSRetain);
+	if (dmaController == NULL) {
+		return false;
+	}
+
+	result = dmaController->initDMAChannel(dmaProvider, this, &dmaIndex, inDMAIndex);
+	if (result != kIOReturnSuccess) {
+		return false;
+	}
+
+	queue_init(&dmaCommandsCompleted);
+	dmaCommandsCompletedLock = IOSimpleLockAlloc();
+
+	return true;
+}
+
+void
+IODMAEventSource::free()
+{
+	if (dmaCommandsCompletedLock != NULL) {
+		IOSimpleLockFree(dmaCommandsCompletedLock);
+	}
+	super::free();
+}
+
+OSSharedPtr<IODMAEventSource>
+IODMAEventSource::dmaEventSource(OSObject *inOwner,
+    IOService *inProvider,
+    Action inCompletion,
+    Action inNotification,
+    UInt32 inDMAIndex)
+{
+	OSSharedPtr<IODMAEventSource> dmaES = OSMakeShared<IODMAEventSource>();
+
+	if (dmaES && !dmaES->init(inOwner, inProvider, inCompletion, inNotification, inDMAIndex)) {
+		return nullptr;
+	}
+
+	return dmaES;
+}
+
+IOReturn
+IODMAEventSource::startDMACommand(IODMACommand *dmaCommand, IODirection direction, IOByteCount byteCount, IOByteCount byteOffset)
+{
+	IOReturn result;
+
+	if ((dmaController == NULL) || (dmaIndex == 0xFFFFFFFF)) {
+		return kIOReturnError;
+	}
+
+	if (dmaSynchBusy) {
+		return kIOReturnBusy;
+	}
+
+	if (dmaCompletionAction == NULL) {
+		dmaSynchBusy = true;
+	}
+
+	result = dmaController->startDMACommand(dmaIndex, dmaCommand, direction, byteCount, byteOffset);
+
+	if (result != kIOReturnSuccess) {
+		dmaSynchBusy = false;
+		return result;
+	}
+
+	while (dmaSynchBusy) {
+		sleepGate(&dmaSynchBusy, THREAD_UNINT);
+	}
+
+	return kIOReturnSuccess;
+}
+
+IOReturn
+IODMAEventSource::stopDMACommand(bool flush, uint64_t timeout)
+{
+	if ((dmaController == NULL) || (dmaIndex == 0xFFFFFFFF)) {
+		return kIOReturnError;
+	}
+
+	return dmaController->stopDMACommand(dmaIndex, flush, timeout);
+}
+
+
+IOReturn
+IODMAEventSource::queryDMACommand(IODMACommand **dmaCommand, IOByteCount *transferCount, bool waitForIdle)
+{
+	if ((dmaController == NULL) || (dmaIndex == 0xFFFFFFFF)) {
+		return kIOReturnError;
+	}
+
+	return dmaController->queryDMACommand(dmaIndex, dmaCommand, transferCount, waitForIdle);
+}
+
+
+IOByteCount
+IODMAEventSource::getFIFODepth(IODirection direction)
+{
+	if ((dmaController == NULL) || (dmaIndex == 0xFFFFFFFF)) {
+		return 0;
+	}
+
+	return dmaController->getFIFODepth(dmaIndex, direction);
+}
+
+
+IOReturn
+IODMAEventSource::setFIFODepth(IOByteCount depth)
+{
+	if ((dmaController == NULL) || (dmaIndex == 0xFFFFFFFF)) {
+		return kIOReturnError;
+	}
+
+	return dmaController->setFIFODepth(dmaIndex, depth);
+}
+
+
+IOByteCount
+IODMAEventSource::validFIFODepth(IOByteCount depth, IODirection direction)
+{
+	if ((dmaController == NULL) || (dmaIndex == 0xFFFFFFFF)) {
+		return kIOReturnError;
+	}
+
+	return dmaController->validFIFODepth(dmaIndex, depth, direction);
+}
+
+
+IOReturn
+IODMAEventSource::setFrameSize(UInt8 byteCount)
+{
+	if ((dmaController == NULL) || (dmaIndex == 0xFFFFFFFF)) {
+		return kIOReturnError;
+	}
+
+	return dmaController->setFrameSize(dmaIndex, byteCount);
+}
+
+// protected
+
+bool
+IODMAEventSource::checkForWork(void)
+{
+	IODMACommand     *dmaCommand = NULL;
+	bool work, again;
+
+	IOSimpleLockLock(dmaCommandsCompletedLock);
+	work = !queue_empty(&dmaCommandsCompleted);
+	if (work) {
+		queue_remove_first(&dmaCommandsCompleted, dmaCommand, IODMACommand *, fCommandChain);
+		again = !queue_empty(&dmaCommandsCompleted);
+	} else {
+		again = false;
+	}
+	IOSimpleLockUnlock(dmaCommandsCompletedLock);
+
+	if (work) {
+		(*dmaCompletionAction)(owner, this, dmaCommand, dmaCommand->reserved->fStatus, dmaCommand->reserved->fActualByteCount, dmaCommand->reserved->fTimeStamp);
+	}
+
+	return again;
+}
+
+void
+IODMAEventSource::completeDMACommand(IODMACommand *dmaCommand)
+{
+	if (dmaCompletionAction != NULL) {
+		IOSimpleLockLock(dmaCommandsCompletedLock);
+		queue_enter(&dmaCommandsCompleted, dmaCommand, IODMACommand *, fCommandChain);
+		IOSimpleLockUnlock(dmaCommandsCompletedLock);
+
+		signalWorkAvailable();
+	} else {
+		dmaSynchBusy = false;
+		wakeupGate(&dmaSynchBusy, true);
+	}
+}
+
+void
+IODMAEventSource::notifyDMACommand(IODMACommand *dmaCommand, IOReturn status, IOByteCount actualByteCount, AbsoluteTime timeStamp)
+{
+	dmaCommand->reserved->fStatus = status;
+	dmaCommand->reserved->fActualByteCount = actualByteCount;
+	dmaCommand->reserved->fTimeStamp = timeStamp;
+
+	if (dmaNotificationAction != NULL) {
+		(*dmaNotificationAction)(owner, this, dmaCommand, status, actualByteCount, timeStamp);
+	}
+}
+
+IOReturn
+IODMAEventSource::setDMAConfig(UInt32 newReqIndex)
+{
+	return dmaController->setDMAConfig(dmaIndex, dmaProvider, newReqIndex);
+}
+
+bool
+IODMAEventSource::validDMAConfig(UInt32 newReqIndex)
+{
+	return dmaController->validDMAConfig(dmaIndex, dmaProvider, newReqIndex);
+}