iokit/Kernel/IOPlatformIO.cpp

   1 /*
   2  * Copyright (c) 2019 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_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 License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28
  29 extern "C" {
  30 #include <pexpert/pexpert.h>
  31 }
  32
  33 #include <IOKit/platform/IOPlatformIO.h>
  34
  35 #define super IOService
  36 OSDefineMetaClassAndAbstractStructors(IOPlatformIO, IOService);
  37
  38 static IOPlatformIO * platformIOProvider;
  39
  40 bool
  41 IOPlatformIO::start(IOService * provider)
  42 {
  43         if (!super::start(provider)) {
  44                 return false;
  45         }
  46
  47         if (platformIOProvider == NULL) {
  48                 platformIOProvider = this;
  49         }
  50
  51         return true;
  52 }
  53
  54 bool
  55 PE_handle_platform_error(vm_offset_t far)
  56 {
  57         if (platformIOProvider == NULL) {
  58                 return false;
  59         } else {
  60                 return platformIOProvider->handlePlatformError(far);
  61         }
  62 }