iokit/Drivers/platform/drvAppleNMI/AppleNMI.cpp

   1 /*
   2  * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_OSREFERENCE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License.  The rights granted to you under the
  10  * License may not be used to create, or enable the creation or
  11  * redistribution of, unlawful or unlicensed copies of an Apple operating
  12  * system, or to circumvent, violate, or enable the circumvention or
  13  * violation of, any terms of an Apple operating system software license
  14  * agreement.
  15  *
  16  * Please obtain a copy of the License at
  17  * http://www.opensource.apple.com/apsl/ and read it before using this
  18  * file.
  19  *
  20  * The Original Code and all software distributed under the License are
  21  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  22  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  23  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  25  * Please see the License for the specific language governing rights and
  26  * limitations under the License.
  27  *
  28  * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
  29  */
  30 /*
  31  * Copyright (c) 1998-2003 Apple Computer, Inc.  All rights reserved.
  32  *
  33  *  DRI: Josh de Cesare
  34  *
  35  */
  36
  37 #include <IOKit/IOTypes.h>
  38 #include <IOKit/IOLib.h>
  39 #include <IOKit/pwr_mgt/RootDomain.h>
  40
  41 #include <IOKit/platform/AppleNMI.h>
  42
  43 extern "C" {
  44 #include <pexpert/pexpert.h>
  45 }
  46
  47 bool RootRegistered( OSObject * us, void *, IOService * yourDevice );
  48
  49 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
  50
  51 #define super IOService
  52
  53 OSDefineMetaClassAndStructors(AppleNMI, IOService);
  54 OSMetaClassDefineReservedUnused(AppleNMI,  0);
  55 OSMetaClassDefineReservedUnused(AppleNMI,  1);
  56 OSMetaClassDefineReservedUnused(AppleNMI,  2);
  57 OSMetaClassDefineReservedUnused(AppleNMI,  3);
  58
  59 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
  60
  61 bool AppleNMI::start(IOService *provider)
  62 {
  63   if (!super::start(provider)) return false;
  64
  65   enable_debugger = FALSE;
  66   mask_NMI = FALSE;
  67
  68   if (provider->getProperty("enable_debugger"))
  69       enable_debugger = TRUE;  // Flag to automatically jump to debugger at NMI press
  70
  71   if (provider->getProperty("mask_NMI"))
  72       mask_NMI = TRUE;         // Flag to mask/unmask NMI @ sleep/wake
  73
  74   // Get notified when Root Domain registers
  75   addNotification( gIOPublishNotification, serviceMatching("IOPMrootDomain"), (IOServiceNotificationHandler)RootRegistered, this, 0 );
  76
  77   // Register the interrupt.
  78   provider->registerInterrupt(0, this, (IOInterruptAction) &AppleNMI::handleInterrupt, 0);
  79   provider->enableInterrupt(0);
  80
  81   return true;
  82 }
  83
  84 // **********************************************************************************
  85 // The Root Power Domain has registered, so now we register as an interested driver
  86 // so we know when the system is going to sleep or wake
  87 // **********************************************************************************
  88 bool RootRegistered( OSObject * us, void *, IOService * yourDevice )
  89 {
  90     if ( yourDevice != NULL ) {
  91         ((AppleNMI *)us)->rootDomain = yourDevice;
  92         ((IOPMrootDomain *)yourDevice)->registerInterestedDriver((IOService *) us);
  93     }
  94
  95     return true;
  96 }
  97
  98 IOReturn AppleNMI::initNMI(IOInterruptController *parentController, OSData *parentSource)
  99 {
 100   return kIOReturnSuccess;
 101 }
 102
 103 IOReturn AppleNMI::handleInterrupt(void * /*refCon*/, IOService * /*nub*/, int /*source*/)
 104 {
 105     if(enable_debugger == TRUE)
 106         Debugger("NMI");                         // This is a direct call to the Debugger
 107     else
 108         PE_enter_debugger("NMI");                // This is a indirect call the Debugger that is dependent on the debug flag
 109
 110     return kIOReturnSuccess;
 111 }
 112
 113 //*********************************************************************************
 114 // powerStateWillChangeTo
 115 //
 116 // We are notified here of power changes in the root domain.  The root domain
 117 // cannot actually turn itself on and off, but it notifies us anyway.
 118 //*********************************************************************************
 119 IOReturn AppleNMI::powerStateWillChangeTo ( IOPMPowerFlags theFlags, unsigned long, IOService*)
 120 {
 121     volatile unsigned long *nmiIntSourceAddr;
 122     unsigned long nmiIntSource;
 123
 124     if (mask_NMI == TRUE)
 125     {
 126         if ( ! (theFlags & IOPMPowerOn) )
 127         {
 128             // Mask NMI and change from edge to level whilst sleeping (copied directly from OS9 code)
 129             nmiIntSourceAddr = (volatile unsigned long *)kExtInt9_NMIIntSource;
 130             nmiIntSource = ml_phys_read(nmiIntSourceAddr);
 131             nmiIntSource |= kNMIIntLevelMask;
 132             ml_phys_write(nmiIntSourceAddr, nmiIntSource);
 133             eieio();
 134             nmiIntSource |= kNMIIntMask;
 135             ml_phys_write(nmiIntSourceAddr, nmiIntSource);
 136             eieio();
 137         }
 138         else
 139         {
 140             // Unmask NMI and change back to edge (copied directly from OS9 code)
 141             nmiIntSourceAddr = (volatile unsigned long *)kExtInt9_NMIIntSource;
 142             nmiIntSource = ml_phys_read(nmiIntSourceAddr);
 143             nmiIntSource &= ~kNMIIntLevelMask;
 144             ml_phys_write(nmiIntSourceAddr, nmiIntSource);
 145             eieio();
 146             nmiIntSource &= ~kNMIIntMask;
 147             ml_phys_write(nmiIntSourceAddr, nmiIntSource);
 148             eieio();
 149         }
 150     }
 151
 152     return IOPMAckImplied;
 153 }