iokit/Kernel/IOCPU.cpp

   1 /*
   2  * Copyright (c) 1999-2000 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) 1999-2000 Apple Computer, Inc.  All rights reserved.
  24  *
  25  *  DRI: Josh de Cesare
  26  *
  27  */
  28
  29 extern "C" {
  30 #include <machine/machine_routines.h>
  31 #include <pexpert/pexpert.h>
  32 }
  33
  34 #include <IOKit/IOLib.h>
  35 #include <IOKit/IOPlatformExpert.h>
  36 #include <IOKit/IOUserClient.h>
  37 #include <IOKit/IOCPU.h>
  38
  39
  40 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
  41
  42 kern_return_t PE_cpu_start(cpu_id_t target,
  43                            vm_offset_t start_paddr, vm_offset_t arg_paddr)
  44 {
  45   IOCPU *targetCPU = OSDynamicCast(IOCPU, (OSObject *)target);
  46
  47   if (targetCPU == 0) return KERN_FAILURE;
  48   return targetCPU->startCPU(start_paddr, arg_paddr);
  49 }
  50
  51 void PE_cpu_halt(cpu_id_t target)
  52 {
  53   IOCPU *targetCPU = OSDynamicCast(IOCPU, (OSObject *)target);
  54
  55   if (targetCPU) targetCPU->haltCPU();
  56 }
  57
  58 void PE_cpu_signal(cpu_id_t source, cpu_id_t target)
  59 {
  60   IOCPU *sourceCPU = OSDynamicCast(IOCPU, (OSObject *)source);
  61   IOCPU *targetCPU = OSDynamicCast(IOCPU, (OSObject *)target);
  62
  63   if (sourceCPU && targetCPU) sourceCPU->signalCPU(targetCPU);
  64 }
  65
  66 void PE_cpu_machine_init(cpu_id_t target, boolean_t boot)
  67 {
  68   IOCPU *targetCPU = OSDynamicCast(IOCPU, (OSObject *)target);
  69
  70   if (targetCPU) targetCPU->initCPU(boot);
  71 }
  72
  73 void PE_cpu_machine_quiesce(cpu_id_t target)
  74 {
  75   IOCPU *targetCPU = OSDynamicCast(IOCPU, (OSObject *)target);
  76
  77   if (targetCPU) targetCPU->quiesceCPU();
  78 }
  79
  80 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
  81
  82 #define super IOService
  83
  84 OSDefineMetaClassAndAbstractStructors(IOCPU, IOService);
  85 OSMetaClassDefineReservedUnused(IOCPU, 0);
  86 OSMetaClassDefineReservedUnused(IOCPU, 1);
  87 OSMetaClassDefineReservedUnused(IOCPU, 2);
  88 OSMetaClassDefineReservedUnused(IOCPU, 3);
  89 OSMetaClassDefineReservedUnused(IOCPU, 4);
  90 OSMetaClassDefineReservedUnused(IOCPU, 5);
  91 OSMetaClassDefineReservedUnused(IOCPU, 6);
  92 OSMetaClassDefineReservedUnused(IOCPU, 7);
  93
  94 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
  95
  96 static OSArray *gIOCPUs;
  97 static const OSSymbol *gIOCPUStateKey;
  98 static OSString *gIOCPUStateNames[kIOCPUStateCount];
  99
 100 void IOCPUSleepKernel(void)
 101 {
 102   long cnt, numCPUs;
 103   IOCPU *target;
 104
 105   numCPUs = gIOCPUs->getCount();
 106
 107   // Sleep the CPUs.
 108   cnt = numCPUs;
 109   while (cnt--) {
 110     target = OSDynamicCast(IOCPU, gIOCPUs->getObject(cnt));
 111     if (target->getCPUState() == kIOCPUStateRunning) {
 112       target->haltCPU();
 113     }
 114   }
 115
 116   // Wake the other CPUs.
 117   for (cnt = 1; cnt < numCPUs; cnt++) {
 118     target = OSDynamicCast(IOCPU, gIOCPUs->getObject(cnt));
 119     if (target->getCPUState() == kIOCPUStateStopped) {
 120       processor_start(target->getMachProcessor());
 121     }
 122   }
 123 }
 124
 125 void IOCPU::initCPUs(void)
 126 {
 127   if (gIOCPUs == 0) {
 128     gIOCPUs = OSArray::withCapacity(1);
 129
 130     gIOCPUStateKey = OSSymbol::withCStringNoCopy("IOCPUState");
 131
 132     gIOCPUStateNames[kIOCPUStateUnregistered] =
 133       OSString::withCStringNoCopy("Unregistered");
 134     gIOCPUStateNames[kIOCPUStateUninitalized] =
 135       OSString::withCStringNoCopy("Uninitalized");
 136     gIOCPUStateNames[kIOCPUStateStopped] =
 137       OSString::withCStringNoCopy("Stopped");
 138     gIOCPUStateNames[kIOCPUStateRunning] =
 139       OSString::withCStringNoCopy("Running");
 140   }
 141 }
 142
 143 bool IOCPU::start(IOService *provider)
 144 {
 145   OSData *busFrequency, *cpuFrequency, *decFrequency;
 146
 147   if (!super::start(provider)) return false;
 148
 149   initCPUs();
 150
 151   _cpuGroup = gIOCPUs;
 152   cpuNub = provider;
 153
 154   gIOCPUs->setObject(this);
 155
 156   // Correct the bus, cpu and dec frequencies in the device tree.
 157   busFrequency = OSData::withBytesNoCopy((void *)&gPEClockFrequencyInfo.bus_clock_rate_hz, 4);
 158   cpuFrequency = OSData::withBytesNoCopy((void *)&gPEClockFrequencyInfo.cpu_clock_rate_hz, 4);
 159   decFrequency = OSData::withBytesNoCopy((void *)&gPEClockFrequencyInfo.dec_clock_rate_hz, 4);
 160   provider->setProperty("bus-frequency", busFrequency);
 161   provider->setProperty("clock-frequency", cpuFrequency);
 162   provider->setProperty("timebase-frequency", decFrequency);
 163   busFrequency->release();
 164   cpuFrequency->release();
 165   decFrequency->release();
 166
 167   setProperty("IOCPUID", (UInt32)this, 32);
 168
 169   setCPUNumber(0);
 170   setCPUState(kIOCPUStateUnregistered);
 171
 172   return true;
 173 }
 174
 175 IOReturn IOCPU::setProperties(OSObject *properties)
 176 {
 177   OSDictionary *dict = OSDynamicCast(OSDictionary, properties);
 178   OSString     *stateStr;
 179
 180   if (dict == 0) return kIOReturnUnsupported;
 181
 182   stateStr = OSDynamicCast(OSString, dict->getObject(gIOCPUStateKey));
 183   if (stateStr != 0) {
 184     if (!IOUserClient::clientHasPrivilege(current_task(), "root"))
 185       return kIOReturnNotPrivileged;
 186
 187     if (_cpuNumber == 0) return kIOReturnUnsupported;
 188
 189     if (stateStr->isEqualTo("running")) {
 190       if (_cpuState == kIOCPUStateStopped) {
 191         processor_start(machProcessor);
 192       } else if (_cpuState != kIOCPUStateRunning) {
 193         return kIOReturnUnsupported;
 194       }
 195     } else if (stateStr->isEqualTo("stopped")) {
 196       if (_cpuState == kIOCPUStateRunning) {
 197         haltCPU();
 198       } else if (_cpuState != kIOCPUStateStopped) {
 199         return kIOReturnUnsupported;
 200       }
 201     } else return kIOReturnUnsupported;
 202
 203     return kIOReturnSuccess;
 204   }
 205
 206   return kIOReturnUnsupported;
 207 }
 208
 209 void IOCPU::signalCPU(IOCPU */*target*/)
 210 {
 211 }
 212
 213 void IOCPU::enableCPUTimeBase(bool /*enable*/)
 214 {
 215 }
 216
 217 UInt32 IOCPU::getCPUNumber(void)
 218 {
 219   return _cpuNumber;
 220 }
 221
 222 void IOCPU::setCPUNumber(UInt32 cpuNumber)
 223 {
 224   _cpuNumber = cpuNumber;
 225   setProperty("IOCPUNumber", _cpuNumber, 32);
 226 }
 227
 228 UInt32 IOCPU::getCPUState(void)
 229 {
 230   return _cpuState;
 231 }
 232
 233 void IOCPU::setCPUState(UInt32 cpuState)
 234 {
 235   if ((cpuState >= 0) && (cpuState < kIOCPUStateCount)) {
 236     _cpuState = cpuState;
 237     setProperty(gIOCPUStateKey, gIOCPUStateNames[cpuState]);
 238   }
 239 }
 240
 241 OSArray *IOCPU::getCPUGroup(void)
 242 {
 243   return _cpuGroup;
 244 }
 245
 246 UInt32 IOCPU::getCPUGroupSize(void)
 247 {
 248   return _cpuGroup->getCount();
 249 }
 250
 251 processor_t IOCPU::getMachProcessor(void)
 252 {
 253   return machProcessor;
 254 }
 255
 256
 257 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
 258
 259 #undef super
 260 #define super IOInterruptController
 261
 262 OSDefineMetaClassAndStructors(IOCPUInterruptController, IOInterruptController);
 263
 264 OSMetaClassDefineReservedUnused(IOCPUInterruptController, 0);
 265 OSMetaClassDefineReservedUnused(IOCPUInterruptController, 1);
 266 OSMetaClassDefineReservedUnused(IOCPUInterruptController, 2);
 267 OSMetaClassDefineReservedUnused(IOCPUInterruptController, 3);
 268 OSMetaClassDefineReservedUnused(IOCPUInterruptController, 4);
 269 OSMetaClassDefineReservedUnused(IOCPUInterruptController, 5);
 270
 271
 272
 273 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
 274
 275
 276 IOReturn IOCPUInterruptController::initCPUInterruptController(int sources)
 277 {
 278   int cnt;
 279
 280   if (!super::init()) return kIOReturnInvalid;
 281
 282   numCPUs = sources;
 283
 284   cpus = (IOCPU **)IOMalloc(numCPUs * sizeof(IOCPU *));
 285   if (cpus == 0) return kIOReturnNoMemory;
 286   bzero(cpus, numCPUs * sizeof(IOCPU *));
 287
 288   vectors = (IOInterruptVector *)IOMalloc(numCPUs * sizeof(IOInterruptVector));
 289   if (vectors == 0) return kIOReturnNoMemory;
 290   bzero(vectors, numCPUs * sizeof(IOInterruptVector));
 291
 292   // Allocate locks for the
 293   for (cnt = 0; cnt < numCPUs; cnt++) {
 294     vectors[cnt].interruptLock = IOLockAlloc();
 295     if (vectors[cnt].interruptLock == NULL) {
 296       for (cnt = 0; cnt < numCPUs; cnt++) {
 297         if (vectors[cnt].interruptLock != NULL)
 298           IOLockFree(vectors[cnt].interruptLock);
 299       }
 300       return kIOReturnNoResources;
 301     }
 302   }
 303
 304   return kIOReturnSuccess;
 305 }
 306
 307 void IOCPUInterruptController::registerCPUInterruptController(void)
 308 {
 309   registerService();
 310
 311   getPlatform()->registerInterruptController(gPlatformInterruptControllerName,
 312                                              this);
 313 }
 314
 315 void IOCPUInterruptController::setCPUInterruptProperties(IOService *service)
 316 {
 317   int          cnt;
 318   OSArray      *controller;
 319   OSArray      *specifier;
 320   OSData       *tmpData;
 321   long         tmpLong;
 322
 323   // Create the interrupt specifer array.
 324   specifier = OSArray::withCapacity(numCPUs);
 325   for (cnt = 0; cnt < numCPUs; cnt++) {
 326     tmpLong = cnt;
 327     tmpData = OSData::withBytes(&tmpLong, sizeof(tmpLong));
 328     specifier->setObject(tmpData);
 329     tmpData->release();
 330   };
 331
 332   // Create the interrupt controller array.
 333   controller = OSArray::withCapacity(numCPUs);
 334   for (cnt = 0; cnt < numCPUs; cnt++) {
 335     controller->setObject(gPlatformInterruptControllerName);
 336   }
 337
 338   // Put the two arrays into the property table.
 339   service->setProperty(gIOInterruptControllersKey, controller);
 340   service->setProperty(gIOInterruptSpecifiersKey, specifier);
 341   controller->release();
 342   specifier->release();
 343 }
 344
 345 void IOCPUInterruptController::enableCPUInterrupt(IOCPU *cpu)
 346 {
 347   ml_install_interrupt_handler(cpu, cpu->getCPUNumber(), this,
 348                                (IOInterruptHandler)&IOCPUInterruptController::handleInterrupt, 0);
 349
 350   enabledCPUs++;
 351
 352   if (enabledCPUs == numCPUs) thread_wakeup(this);
 353 }
 354
 355 IOReturn IOCPUInterruptController::registerInterrupt(IOService *nub,
 356                                                      int source,
 357                                                      void *target,
 358                                                      IOInterruptHandler handler,
 359                                                      void *refCon)
 360 {
 361   IOInterruptVector *vector;
 362
 363   if (source >= numCPUs) return kIOReturnNoResources;
 364
 365   vector = &vectors[source];
 366
 367   // Get the lock for this vector.
 368   IOTakeLock(vector->interruptLock);
 369
 370   // Make sure the vector is not in use.
 371   if (vector->interruptRegistered) {
 372     IOUnlock(vector->interruptLock);
 373     return kIOReturnNoResources;
 374   }
 375
 376   // Fill in vector with the client's info.
 377   vector->handler = handler;
 378   vector->nub     = nub;
 379   vector->source  = source;
 380   vector->target  = target;
 381   vector->refCon  = refCon;
 382
 383   // Get the vector ready.  It starts hard disabled.
 384   vector->interruptDisabledHard = 1;
 385   vector->interruptDisabledSoft = 1;
 386   vector->interruptRegistered   = 1;
 387
 388   IOUnlock(vector->interruptLock);
 389
 390   if (enabledCPUs != numCPUs) {
 391     assert_wait(this, THREAD_UNINT);
 392     thread_block(0);
 393   }
 394
 395   return kIOReturnSuccess;
 396 }
 397
 398 IOReturn IOCPUInterruptController::getInterruptType(IOService */*nub*/,
 399                                                     int /*source*/,
 400                                                     int *interruptType)
 401 {
 402   if (interruptType == 0) return kIOReturnBadArgument;
 403
 404   *interruptType = kIOInterruptTypeLevel;
 405
 406   return kIOReturnSuccess;
 407 }
 408
 409 IOReturn IOCPUInterruptController::enableInterrupt(IOService */*nub*/,
 410                                                    int /*source*/)
 411 {
 412 //  ml_set_interrupts_enabled(true);
 413   return kIOReturnSuccess;
 414 }
 415
 416 IOReturn IOCPUInterruptController::disableInterrupt(IOService */*nub*/,
 417                                                     int /*source*/)
 418 {
 419 //  ml_set_interrupts_enabled(false);
 420   return kIOReturnSuccess;
 421 }
 422
 423 IOReturn IOCPUInterruptController::causeInterrupt(IOService */*nub*/,
 424                                                   int /*source*/)
 425 {
 426   ml_cause_interrupt();
 427   return kIOReturnSuccess;
 428 }
 429
 430 IOReturn IOCPUInterruptController::handleInterrupt(void */*refCon*/,
 431                                                    IOService */*nub*/,
 432                                                    int source)
 433 {
 434   IOInterruptVector *vector;
 435
 436   vector = &vectors[source];
 437
 438   if (!vector->interruptRegistered) return kIOReturnInvalid;
 439
 440   vector->handler(vector->target, vector->refCon,
 441                   vector->nub, vector->source);
 442
 443   return kIOReturnSuccess;
 444 }
 445
 446 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */