iokit/Drivers/platform/drvAppleIntelClock/IntelClock.cpp

   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 // Backdoor hack for Intel Clock.
  24 //
  25 //
  26
  27 #include "AppleIntelClock.h"
  28
  29 #define super IOService
  30 OSDefineMetaClassAndStructors(AppleIntelClock, IOService);
  31
  32 extern "C" {
  33 extern void     hardclock(void);
  34 };
  35
  36 bool
  37 AppleIntelClock::start(IOService *provider)
  38 {
  39         if (!super::start(provider))
  40                 return false;
  41
  42         provider->registerInterrupt(kIRQ_Clock, 0, (IOInterruptAction) hardclock);
  43         provider->enableInterrupt(kIRQ_Clock);
  44
  45         publishResource("IORTC", this);
  46         return true;
  47 }