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Annotation of XNU/iokit/Kernel/IOInterruptEventSource.cpp, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /*
        !            23: Copyright (c) 1998 Apple Computer, Inc.  All rights reserved.
        !            24: 
        !            25: HISTORY
        !            26:     1998-7-13  Godfrey van der Linden(gvdl)
        !            27:         Created.
        !            28: */
        !            29: #include <IOKit/IOInterruptEventSource.h>
        !            30: #include <IOKit/IOLib.h>
        !            31: #include <IOKit/IOService.h>
        !            32: #include <IOKit/IOInterrupts.h>
        !            33: #include <IOKit/IOTimeStamp.h>
        !            34: #include <IOKit/IOWorkLoop.h>
        !            35: 
        !            36: #if KDEBUG
        !            37: 
        !            38: #define IOTimeTypeStampS(t)                                            \
        !            39: do {                                                                   \
        !            40:     IOTimeStampStart(IODBG_INTES(t),                                   \
        !            41:                      (unsigned int) this, (unsigned int) owner);       \
        !            42: } while(0)
        !            43: 
        !            44: #define IOTimeTypeStampE(t)                                            \
        !            45: do {                                                                   \
        !            46:     IOTimeStampEnd(IODBG_INTES(t),                                     \
        !            47:                    (unsigned int) this, (unsigned int) owner);         \
        !            48: } while(0)
        !            49: 
        !            50: #define IOTimeStampLatency()                                           \
        !            51: do {                                                                   \
        !            52:     IOTimeStampEnd(IODBG_INTES(IOINTES_LAT),                           \
        !            53:                    (unsigned int) this, (unsigned int) owner);         \
        !            54: } while(0)
        !            55: 
        !            56: #else /* !KDEBUG */
        !            57: #define IOTimeTypeStampS(t)
        !            58: #define IOTimeTypeStampE(t)
        !            59: #define IOTimeStampLatency()
        !            60: #endif /* KDEBUG */
        !            61: 
        !            62: #define super IOEventSource
        !            63: 
        !            64: OSDefineMetaClassAndStructors(IOInterruptEventSource, IOEventSource)
        !            65: 
        !            66: bool IOInterruptEventSource::init(OSObject *inOwner,
        !            67:                                  Action inAction = 0,
        !            68:                                  IOService *inProvider = 0,
        !            69:                                  int inIntIndex = 0)
        !            70: {
        !            71:     bool res = true;
        !            72: 
        !            73:     if ( !super::init(inOwner, (IOEventSourceAction) inAction) )
        !            74:         return false;
        !            75: 
        !            76:     provider = inProvider;
        !            77:     producerCount = consumerCount = 0;
        !            78:     autoDisable = explicitDisable = false;
        !            79:     intIndex = -1;
        !            80: 
        !            81:     // Assumes inOwner holds a reference(retain) on the provider
        !            82:     if (inProvider) {
        !            83:         int intType;
        !            84: 
        !            85:         res = (kIOReturnSuccess
        !            86:                     == inProvider->getInterruptType(inIntIndex, &intType));
        !            87:         if (res) {
        !            88:             IOInterruptAction intHandler;
        !            89: 
        !            90:             autoDisable = (intType == kIOInterruptTypeLevel);
        !            91:             if (autoDisable) {
        !            92:                 intHandler = (IOInterruptAction)
        !            93:                 &IOInterruptEventSource::disableInterruptOccurred;
        !            94:             }
        !            95:             else
        !            96:                 intHandler = (IOInterruptAction)
        !            97:                     &IOInterruptEventSource::normalInterruptOccurred;
        !            98: 
        !            99:             res = (kIOReturnSuccess == inProvider->registerInterrupt
        !           100:                                         (inIntIndex, this, intHandler));
        !           101:             if (res)
        !           102:                 intIndex = inIntIndex;
        !           103:         }
        !           104:     }
        !           105: 
        !           106:     return res;
        !           107: }
        !           108: 
        !           109: IOInterruptEventSource *
        !           110: IOInterruptEventSource::interruptEventSource(OSObject *inOwner,
        !           111:                                             Action inAction,
        !           112:                                             IOService *inProvider,
        !           113:                                             int inIntIndex)
        !           114: {
        !           115:     IOInterruptEventSource *me = new IOInterruptEventSource;
        !           116: 
        !           117:     if (me && !me->init(inOwner, inAction, inProvider, inIntIndex)) {
        !           118:         me->free();
        !           119:         return 0;
        !           120:     }
        !           121: 
        !           122:     return me;
        !           123: }
        !           124: 
        !           125: void IOInterruptEventSource::free()
        !           126: {
        !           127:     if (provider && intIndex != -1)
        !           128:         provider->unregisterInterrupt(intIndex);
        !           129: 
        !           130:     super::free();
        !           131: }
        !           132: 
        !           133: void IOInterruptEventSource::enable()
        !           134: {
        !           135:     if (provider && intIndex != -1) {
        !           136:         provider->enableInterrupt(intIndex);
        !           137:         explicitDisable = false;
        !           138:     }
        !           139: }
        !           140: 
        !           141: void IOInterruptEventSource::disable()
        !           142: {
        !           143:     if (provider && intIndex != -1) {
        !           144:         provider->disableInterrupt(intIndex);
        !           145:         explicitDisable = true;
        !           146:     }
        !           147: }
        !           148: 
        !           149: const IOService *IOInterruptEventSource::getProvider() const
        !           150: {
        !           151:     return provider;
        !           152: }
        !           153: 
        !           154: int IOInterruptEventSource::getIntIndex() const
        !           155: {
        !           156:     return intIndex;
        !           157: }
        !           158: 
        !           159: bool IOInterruptEventSource::getAutoDisable() const
        !           160: {
        !           161:     return autoDisable;
        !           162: }
        !           163: 
        !           164: bool IOInterruptEventSource::checkForWork()
        !           165: {
        !           166:     unsigned int cacheProdCount = producerCount;
        !           167:     int numInts = cacheProdCount - consumerCount;
        !           168:     IOInterruptEventAction intAction = (IOInterruptEventAction) action;
        !           169: 
        !           170:     if (numInts > 0) {
        !           171: 
        !           172:         IOTimeStampLatency();
        !           173:         IOTimeTypeStampS(IOINTES_CLIENT);
        !           174:             IOTimeStampConstant(IODBG_INTES(IOINTES_ACTION),
        !           175:                                 (unsigned int) intAction, (unsigned int) owner);
        !           176:             (*intAction)(owner, this,  numInts);
        !           177:         IOTimeTypeStampE(IOINTES_CLIENT);
        !           178: 
        !           179:         consumerCount = cacheProdCount;
        !           180:         if (autoDisable && !explicitDisable)
        !           181:             enable();
        !           182:     }
        !           183:     else if (numInts < 0) {
        !           184:         IOTimeStampLatency();
        !           185:         IOTimeTypeStampS(IOINTES_CLIENT);
        !           186:             IOTimeStampConstant(IODBG_INTES(IOINTES_ACTION),
        !           187:                                 (unsigned int) intAction, (unsigned int) owner);
        !           188:              (*intAction)(owner, this, -numInts);
        !           189:         IOTimeTypeStampE(IOINTES_CLIENT);
        !           190:     
        !           191:         consumerCount = cacheProdCount;
        !           192:         if (autoDisable && !explicitDisable)
        !           193:             enable();
        !           194:     }
        !           195: 
        !           196:     return false;
        !           197: }
        !           198: 
        !           199: void IOInterruptEventSource::normalInterruptOccurred
        !           200:     (void */*refcon*/, IOService */*prov*/, int /*source*/)
        !           201: {
        !           202: IOTimeTypeStampS(IOINTES_INTCTXT);
        !           203: IOTimeStampLatency();
        !           204: 
        !           205:     producerCount++;
        !           206: 
        !           207: IOTimeTypeStampS(IOINTES_SEMA);
        !           208:     workLoop->signalWorkAvailable();
        !           209: IOTimeTypeStampE(IOINTES_SEMA);
        !           210: 
        !           211: IOTimeTypeStampE(IOINTES_INTCTXT);
        !           212: }
        !           213: 
        !           214: void IOInterruptEventSource::disableInterruptOccurred
        !           215:     (void */*refcon*/, IOService *prov, int source)
        !           216: {
        !           217: IOTimeTypeStampS(IOINTES_INTCTXT);
        !           218: IOTimeStampLatency();
        !           219: 
        !           220:     prov->disableInterrupt(source);    /* disable the interrupt */
        !           221: 
        !           222:     producerCount++;
        !           223: 
        !           224: IOTimeTypeStampS(IOINTES_SEMA);
        !           225:     workLoop->signalWorkAvailable();
        !           226: IOTimeTypeStampE(IOINTES_SEMA);
        !           227: 
        !           228: IOTimeTypeStampE(IOINTES_INTCTXT);
        !           229: }
        !           230: 
        !           231: void IOInterruptEventSource::interruptOccurred
        !           232:     (void *refcon, IOService *prov, int source)
        !           233: {
        !           234:     if (autoDisable && prov)
        !           235:         disableInterruptOccurred(refcon, prov, source);
        !           236:     else
        !           237:         normalInterruptOccurred(refcon, prov, source);
        !           238: }

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