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Annotation of XNU/iokit/Drivers/platform/drvAppleGrandCentral/GrandCentral.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) 1999 Apple Computer, Inc.  All rights reserved.
        !            24:  *
        !            25:  *  DRI: Josh de Cesare
        !            26:  *
        !            27:  */
        !            28: 
        !            29: 
        !            30: #include <ppc/proc_reg.h>
        !            31: 
        !            32: #include <IOKit/IOLib.h>
        !            33: #include <IOKit/IODeviceTreeSupport.h>
        !            34: #include <IOKit/IODeviceMemory.h>
        !            35: #include <IOKit/IOPlatformExpert.h>
        !            36: 
        !            37: #include "../drvAppleNMI/AppleNMI.h"
        !            38: 
        !            39: #include "GrandCentral.h"
        !            40: 
        !            41: /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
        !            42: 
        !            43: #define super AppleMacIO
        !            44: 
        !            45: OSDefineMetaClassAndStructors(GrandCentral, AppleMacIO);
        !            46: 
        !            47: bool GrandCentral::start(IOService *provider)
        !            48: {
        !            49:   IOInterruptAction  handler;
        !            50:   IOPhysicalAddress  base;
        !            51:   OSData *           data;
        !            52:   AppleNMI           *appleNMI;
        !            53:   IOService          *sixty6;
        !            54:   long               nmiSource;
        !            55:   OSData             *nmiData;
        !            56:   IOReturn           error;
        !            57:   
        !            58:   // Call MacIO's start.
        !            59:   if (!super::start(provider))
        !            60:     return false;
        !            61:   
        !            62:   // Necessary for Control NDRV.
        !            63:   base = fMemory->getPhysicalAddress();
        !            64:   data = OSData::withBytes(&base, sizeof(base));
        !            65:   if (data != 0) provider->setProperty("AAPL,address", data);
        !            66:   
        !            67:   // Make sure the sixty6 node exists.
        !            68:   if (provider->childFromPath("sixty6", gIODTPlane) == 0) {
        !            69:     sixty6 = new IOService;
        !            70:     if(sixty6->init()) {
        !            71:       sixty6->setName("sixty6");
        !            72:       sixty6->attachToParent(provider, gIODTPlane);
        !            73:       sixty6->registerService();
        !            74:     }
        !            75:   }
        !            76:   
        !            77:   // Make nubs for the children.
        !            78:   publishBelow( provider );
        !            79:   
        !            80:   // get the base address of the this GrandCentral.
        !            81:   grandCentralBaseAddress = fMemory->getVirtualAddress();
        !            82:   
        !            83:   getPlatform()->setCPUInterruptProperties(provider);
        !            84:   
        !            85:   // Allocate the interruptController instance.
        !            86:   interruptController = new GrandCentralInterruptController;
        !            87:   if (interruptController == NULL) return false;
        !            88:   
        !            89:   // call the interruptController's init method.
        !            90:   error = interruptController->initInterruptController(provider, grandCentralBaseAddress);
        !            91:   if (error != kIOReturnSuccess) return false;
        !            92:   
        !            93:   handler = interruptController->getInterruptHandlerAddress();
        !            94:   provider->registerInterrupt(0, interruptController, handler, 0);
        !            95:   
        !            96:   provider->enableInterrupt(0);
        !            97:   
        !            98:   // Register the interrupt controller so client can find it.
        !            99:   getPlatform()->registerInterruptController(gIODTDefaultInterruptController,
        !           100:                                             interruptController);
        !           101:   
        !           102:   // Create the NMI Driver.
        !           103:   nmiSource = 20;
        !           104:   nmiData = OSData::withBytes(&nmiSource, sizeof(long));
        !           105:   appleNMI = new AppleNMI;
        !           106:   if ((nmiData != 0) && (appleNMI != 0)) {
        !           107:     appleNMI->initNMI(interruptController, nmiData);
        !           108:   } 
        !           109:   
        !           110:   return true;
        !           111: }
        !           112: 
        !           113: /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
        !           114: 
        !           115: #undef  super
        !           116: #define super IOInterruptController
        !           117: 
        !           118: OSDefineMetaClassAndStructors(GrandCentralInterruptController, IOInterruptController);
        !           119: 
        !           120: IOReturn GrandCentralInterruptController::initInterruptController(IOService *provider, IOLogicalAddress interruptControllerBase)
        !           121: {
        !           122:   int cnt;
        !           123:   
        !           124:   parentNub = provider;
        !           125:   
        !           126:   // Allocate the task lock.
        !           127:   taskLock = IOLockAlloc();
        !           128:   if (taskLock == 0) return kIOReturnNoResources;
        !           129:   
        !           130:   // Allocate the memory for the vectors
        !           131:   vectors = (IOInterruptVector *)IOMalloc(kNumVectors * sizeof(IOInterruptVector));
        !           132:   if (vectors == NULL) {
        !           133:     IOLockFree(taskLock);
        !           134:     return kIOReturnNoMemory;
        !           135:   }
        !           136:   bzero(vectors, kNumVectors * sizeof(IOInterruptVector));
        !           137:   
        !           138:   // Allocate locks for the 
        !           139:   for (cnt = 0; cnt < kNumVectors; cnt++) {
        !           140:     vectors[cnt].interruptLock = IOLockAlloc();
        !           141:     if (vectors[cnt].interruptLock == NULL) {
        !           142:       for (cnt = 0; cnt < kNumVectors; cnt++) {
        !           143:        IOLockFree(taskLock);
        !           144:        if (vectors[cnt].interruptLock != NULL)
        !           145:          IOLockFree(vectors[cnt].interruptLock);
        !           146:       }
        !           147:       return kIOReturnNoResources;
        !           148:     }
        !           149:   }
        !           150:   
        !           151:   // Setup the registers accessors
        !           152:   eventsReg = (unsigned long)(interruptControllerBase + kEventsOffset);
        !           153:   maskReg   = (unsigned long)(interruptControllerBase + kMaskOffset);
        !           154:   clearReg  = (unsigned long)(interruptControllerBase + kClearOffset);
        !           155:   levelsReg = (unsigned long)(interruptControllerBase + kLevelsOffset);
        !           156:   
        !           157:   // Initialize the registers.
        !           158:   
        !           159:   // Disable all interrupts.
        !           160:   stwbrx(0x00000000, maskReg);
        !           161:   eieio();
        !           162:   
        !           163:   // Clear all pending interrupts.
        !           164:   stwbrx(0xFFFFFFFF, clearReg);
        !           165:   eieio();
        !           166:   
        !           167:   // Disable all interrupts. (again?)
        !           168:   stwbrx(0x00000000, maskReg);
        !           169:   eieio();
        !           170:   
        !           171:   return kIOReturnSuccess;
        !           172: }
        !           173: 
        !           174: IOInterruptAction GrandCentralInterruptController::getInterruptHandlerAddress(void)
        !           175: {
        !           176:   return (IOInterruptAction)&GrandCentralInterruptController::handleInterrupt;
        !           177: }
        !           178: 
        !           179: IOReturn GrandCentralInterruptController::handleInterrupt(void * /*refCon*/,
        !           180:                                                          IOService * /*nub*/,
        !           181:                                                          int /*source*/)
        !           182: {
        !           183:   int               done;
        !           184:   long              events, vectorNumber;
        !           185:   IOInterruptVector *vector;
        !           186:   unsigned long     maskTmp;
        !           187: 
        !           188:   do {
        !           189:     done = 1;
        !           190:     
        !           191:     // Do all the sources for events, plus any pending interrupts.
        !           192:     // Also add in the "level" sensitive sources
        !           193:     maskTmp = lwbrx(maskReg);
        !           194:     events = lwbrx(eventsReg) & ~kTypeLevelMask;
        !           195:     events |= lwbrx(levelsReg) & maskTmp & kTypeLevelMask;
        !           196:     events |= pendingEvents & maskTmp;
        !           197:     pendingEvents = 0;
        !           198:     eieio();
        !           199: 
        !           200:     // Since we have to clear the level'd one clear the current edge's too.
        !           201:     stwbrx(kTypeLevelMask | events, clearReg);
        !           202:     eieio();
        !           203:     
        !           204:     if (events) done = 0;
        !           205:     
        !           206:     while (events) {
        !           207:       vectorNumber = 31 - cntlzw(events);
        !           208:       events ^= (1 << vectorNumber);
        !           209:       vector = &vectors[vectorNumber];
        !           210:       
        !           211:       vector->interruptActive = 1;
        !           212:       sync();
        !           213:       isync();
        !           214:       if (!vector->interruptDisabledSoft) {
        !           215:        isync();
        !           216:        
        !           217:        // Call the handler if it exists.
        !           218:        if (vector->interruptRegistered) {
        !           219:          vector->handler(vector->target, vector->refCon,
        !           220:                          vector->nub, vector->source);
        !           221:        }
        !           222:       } else {
        !           223:        // Hard disable the source.
        !           224:        vector->interruptDisabledHard = 1;
        !           225:        disableVectorHard(vectorNumber, vector);
        !           226:       }
        !           227:       
        !           228:       vector->interruptActive = 0;
        !           229:     }
        !           230:   } while (!done);
        !           231:   
        !           232:   return kIOReturnSuccess;
        !           233: }
        !           234: 
        !           235: bool GrandCentralInterruptController::vectorCanBeShared(long /*vectorNumber*/, IOInterruptVector */*vector*/)
        !           236: {
        !           237:   return true;
        !           238: }
        !           239: 
        !           240: int GrandCentralInterruptController::getVectorType(long vectorNumber, IOInterruptVector */*vector*/)
        !           241: {
        !           242:   int interruptType;
        !           243:   
        !           244:   if (kTypeLevelMask & (1 << vectorNumber)) {
        !           245:     interruptType = kIOInterruptTypeLevel;
        !           246:   } else {
        !           247:     interruptType = kIOInterruptTypeEdge;
        !           248:   }
        !           249:   
        !           250:   return interruptType;
        !           251: }
        !           252: 
        !           253: void GrandCentralInterruptController::disableVectorHard(long vectorNumber, IOInterruptVector */*vector*/)
        !           254: {
        !           255:   unsigned long     maskTmp;
        !           256:   
        !           257:   // Turn the source off at hardware.
        !           258:   maskTmp = lwbrx(maskReg);
        !           259:   maskTmp &= ~(1 << vectorNumber);
        !           260:   stwbrx(maskTmp, maskReg);
        !           261:   eieio();
        !           262: }
        !           263: 
        !           264: void GrandCentralInterruptController::enableVector(long vectorNumber,
        !           265:                                                   IOInterruptVector *vector)
        !           266: {
        !           267:   unsigned long     maskTmp;
        !           268:   
        !           269:   maskTmp = lwbrx(maskReg);
        !           270:   maskTmp |= (1 << vectorNumber);
        !           271:   stwbrx(maskTmp, maskReg);
        !           272:   eieio();
        !           273:   if (lwbrx(levelsReg) & (1 << vectorNumber)) {
        !           274:     // lost the interrupt
        !           275:     causeVector(vectorNumber, vector);
        !           276:   }
        !           277: }
        !           278: 
        !           279: void GrandCentralInterruptController::causeVector(long vectorNumber, IOInterruptVector */*vector*/)
        !           280: {
        !           281:   pendingEvents |= 1 << vectorNumber;
        !           282:   parentNub->causeInterrupt(0);
        !           283: }

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