/*
* Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
*
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+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
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+ * 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
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*
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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+ * The Original Code and all software distributed under the License are
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* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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*/
/*
Copyright (c) 1998 Apple Computer, Inc. All rights reserved.
@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>
@result Return true if this function needs to be called again before all its outstanding events have been processed. */
virtual bool checkForWork();
+/*! @function setWorkLoop
+ @abstract Sub-class implementation of setWorkLoop method. */
+ virtual void setWorkLoop(IOWorkLoop *inWorkLoop);
+
public:
/*! @function interruptEventSource
@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);
private:
OSMetaClassDeclareReservedUnused(IOInterruptEventSource, 0);
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