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 #pragma once 30 31 extern "C" { 32 #include <mach/semaphore.h> 33 }; 34 35 #include <IOKit/IOInterruptController.h> 36 37 /*! 38 * @class PassthruInterruptController 39 * @abstract Trivial IOInterruptController class that passes all IRQs through to a 40 * "child" driver. 41 * @discussion Waits for a "child" driver (typically loaded in a kext) to register itself, 42 * then passes the child driver's IOService pointer back via 43 * waitForChildController() so that XNU can operate on it directly. 44 */ 45 class PassthruInterruptController : public IOInterruptController 46 { 47 OSDeclareDefaultStructors(PassthruInterruptController); 48 49 public: 50 virtual bool init(void) APPLE_KEXT_OVERRIDE; 51 52 virtual void *waitForChildController(void); 53 54 virtual void setCPUInterruptProperties(IOService *service) APPLE_KEXT_OVERRIDE; 55 56 virtual IOReturn registerInterrupt(IOService *nub, int source, 57 void *target, 58 IOInterruptHandler handler, 59 void *refCon) APPLE_KEXT_OVERRIDE; 60 61 virtual IOReturn getInterruptType(IOService *nub, int source, 62 int *interruptType) APPLE_KEXT_OVERRIDE; 63 64 virtual IOReturn enableInterrupt(IOService *nub, int source) APPLE_KEXT_OVERRIDE; 65 virtual IOReturn disableInterrupt(IOService *nub, int source) APPLE_KEXT_OVERRIDE; 66 virtual IOReturn causeInterrupt(IOService *nub, int source) APPLE_KEXT_OVERRIDE; 67 68 virtual IOReturn handleInterrupt(void *refCon, IOService *nub, 69 int source) APPLE_KEXT_OVERRIDE; 70 71 virtual void externalInterrupt(void); 72 73 protected: 74 IOInterruptHandler child_handler; 75 void *child_target; 76 void *child_refCon; 77 IOService *child_nub; 78 semaphore_t child_sentinel; 79 }; 80