/*
- * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 1998-2016 Apple Inc. All rights reserved.
*
- * @APPLE_LICENSE_HEADER_START@
- *
- * Copyright (c) 1999-2003 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. Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this
- * file.
+ * 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
* Please see the License for the specific language governing rights and
* limitations under the License.
*
- * @APPLE_LICENSE_HEADER_END@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
/*
Copyright (c) 1998 Apple Computer, Inc. All rights reserved.
class IOService;
+struct IOInterruptAccountingData;
+
/*! @class IOInterruptEventSource : public IOEventSource
@abstract Event source for interrupt delivery to work-loop based drivers.
@discussion The IOInterruptEventSource is a generic object that delivers calls interrupt routines in it's client in a guaranteed single-threaded manner. IOInterruptEventSource is part of the IOKit $link IOWorkLoop infrastructure where the semantic that one and only one action method is executing within a work-loops event chain.
<br><br>
-When the action method is called in the client member function will receive 2 arguments, (IOEventSource *) sender and (int) count, See $link IOInterruptEventSource::Action. Where sender will be reference to the interrupt that occured and the count will be computed by the difference between the $link producerCount and $link consumerCount. This number may not be reliable as no attempt is made to adjust for around the world type problems but is provided for general information and statistic gathering.
+When the action method is called in the client member function will receive 2 arguments, (IOEventSource *) sender and (int) count, See $link IOInterruptEventSource::Action. Where sender will be reference to the interrupt that occurred and the count will be computed by the difference between the $link producerCount and $link consumerCount. This number may not be reliable as no attempt is made to adjust for around the world type problems but is provided for general information and statistic gathering.
<br><br>
In general a client will use the factory member function to create and initialise the event source and then add it to their work-loop. It is the work loop's responsiblity to maintain the new event source in it's event chain. See $link IOWorkLoop.
<br><br>
@param owner Pointer to client instance.
@param sender Pointer to generation interrupt event source.
@param count Number of interrupts seen before delivery. */
- typedef void (*Action)(OSObject *, IOInterruptEventSource *, int count);
+ typedef void (*Action)(OSObject *owner, IOInterruptEventSource *sender, int count);
/*! @defined IOInterruptEventAction
@discussion Backward compatibilty define for the old non-class scoped type definition. See $link IOInterruptEventSource::Action */
/*! @struct ExpansionData
@discussion This structure will be used to expand the capablilties of the IOWorkLoop in the future.
*/
- struct ExpansionData { };
+ struct ExpansionData {
+ IOInterruptAccountingData * statistics;
+ };
/*! @var reserved
Reserved for future use. (Internal use only) */
+ APPLE_KEXT_WSHADOW_PUSH;
ExpansionData *reserved;
+ APPLE_KEXT_WSHADOW_POP;
/*! @function free
@abstract Sub-class implementation of free method, disconnects from the interrupt source. */
- virtual void free();
+ virtual void free() APPLE_KEXT_OVERRIDE;
/*! @function checkForWork
@abstract Pure Virtual member function used by IOWorkLoop for issueing a client calls.
@discussion This function called when the work-loop is ready to check for any work to do and then to call out the owner/action.
@result Return true if this function needs to be called again before all its outstanding events have been processed. */
- virtual bool checkForWork();
+ virtual bool checkForWork() APPLE_KEXT_OVERRIDE;
+
+/*! @function setWorkLoop
+ @abstract Sub-class implementation of setWorkLoop method. */
+ virtual void setWorkLoop(IOWorkLoop *inWorkLoop) APPLE_KEXT_OVERRIDE;
public:
@discussion A subclass implementation is expected to respect the enabled
state when checkForWork is called. Calling this function will cause the
work-loop to be signalled so that a checkForWork is performed. */
- virtual void enable();
+ virtual void enable() APPLE_KEXT_OVERRIDE;
/*! @function disable
@abstract Disable event source.
@discussion A subclass implementation is expected to respect the enabled
state when checkForWork is called. */
- virtual void disable();
+ virtual void disable() APPLE_KEXT_OVERRIDE;
/*! @function getProvider
@abstract Get'ter for $link provider variable.
@param nub Where did the interrupt originate from
@param ind What is this interrupts index within 'nub'. */
virtual void disableInterruptOccurred(void *, IOService *nub, int ind);
+
+/*! @function warmCPU
+ @abstract Tries to reduce latency for an interrupt which will be received near a specified time.
+ @discussion Warms up a CPU in advance of an interrupt so that the interrupt may be serviced with predictable latency.
+ The warm-up is not periodic; callers should call warmCPU once in advance of each interrupt. It is recommended that
+ requests be issues in serial (i.e. each after the target for the previous call has elapsed), as there is a systemwide
+ cap on the number of outstanding requests. This routine may be disruptive to the system if used with very small intervals
+ between requests; it should be used only in cases where interrupt latency is absolutely critical, and tens or hundreds of
+ milliseconds between targets is the expected time scale. NOTE: it is not safe to call this method with interrupts disabled.
+ @param abstime Time at which interrupt is expected. */
+ IOReturn warmCPU(uint64_t abstime);
+
+private:
+ IOReturn registerInterruptHandler(IOService *inProvider, int inIntIndex);
+ void unregisterInterruptHandler(IOService *inProvider, int inIntIndex);
private:
OSMetaClassDeclareReservedUnused(IOInterruptEventSource, 0);
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