1*4f1223e8SApple OSS Distributions /* 2*4f1223e8SApple OSS Distributions * Copyright (c) 2019 Apple Inc. All rights reserved. 3*4f1223e8SApple OSS Distributions * 4*4f1223e8SApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5*4f1223e8SApple OSS Distributions * 6*4f1223e8SApple OSS Distributions * This file contains Original Code and/or Modifications of Original Code 7*4f1223e8SApple OSS Distributions * as defined in and that are subject to the Apple Public Source License 8*4f1223e8SApple OSS Distributions * Version 2.0 (the 'License'). You may not use this file except in 9*4f1223e8SApple OSS Distributions * compliance with the License. The rights granted to you under the License 10*4f1223e8SApple OSS Distributions * may not be used to create, or enable the creation or redistribution of, 11*4f1223e8SApple OSS Distributions * unlawful or unlicensed copies of an Apple operating system, or to 12*4f1223e8SApple OSS Distributions * circumvent, violate, or enable the circumvention or violation of, any 13*4f1223e8SApple OSS Distributions * terms of an Apple operating system software license agreement. 14*4f1223e8SApple OSS Distributions * 15*4f1223e8SApple OSS Distributions * Please obtain a copy of the License at 16*4f1223e8SApple OSS Distributions * http://www.opensource.apple.com/apsl/ and read it before using this file. 17*4f1223e8SApple OSS Distributions * 18*4f1223e8SApple OSS Distributions * The Original Code and all software distributed under the License are 19*4f1223e8SApple OSS Distributions * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20*4f1223e8SApple OSS Distributions * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21*4f1223e8SApple OSS Distributions * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22*4f1223e8SApple OSS Distributions * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23*4f1223e8SApple OSS Distributions * Please see the License for the specific language governing rights and 24*4f1223e8SApple OSS Distributions * limitations under the License. 25*4f1223e8SApple OSS Distributions * 26*4f1223e8SApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27*4f1223e8SApple OSS Distributions */ 28*4f1223e8SApple OSS Distributions 29*4f1223e8SApple OSS Distributions /* 30*4f1223e8SApple OSS Distributions * 31*4f1223e8SApple OSS Distributions * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. 32*4f1223e8SApple OSS Distributions * 33*4f1223e8SApple OSS Distributions * HISTORY 34*4f1223e8SApple OSS Distributions * 35*4f1223e8SApple OSS Distributions * 2001-01-18 gvdl Made the primary queue pointer public, to be used when 36*4f1223e8SApple OSS Distributions * Ownership is clear. 37*4f1223e8SApple OSS Distributions * 11/13/2000 CJS Created IOCommand class and implementation 38*4f1223e8SApple OSS Distributions * 39*4f1223e8SApple OSS Distributions */ 40*4f1223e8SApple OSS Distributions 41*4f1223e8SApple OSS Distributions /*! 42*4f1223e8SApple OSS Distributions * @header IOCommand 43*4f1223e8SApple OSS Distributions * @abstract 44*4f1223e8SApple OSS Distributions * This header contains the IOCommand class definition. 45*4f1223e8SApple OSS Distributions */ 46*4f1223e8SApple OSS Distributions 47*4f1223e8SApple OSS Distributions #ifndef _IOKIT_IO_COMMAND_H_ 48*4f1223e8SApple OSS Distributions #define _IOKIT_IO_COMMAND_H_ 49*4f1223e8SApple OSS Distributions 50*4f1223e8SApple OSS Distributions /* 51*4f1223e8SApple OSS Distributions * Kernel 52*4f1223e8SApple OSS Distributions */ 53*4f1223e8SApple OSS Distributions 54*4f1223e8SApple OSS Distributions #if defined(KERNEL) && defined(__cplusplus) 55*4f1223e8SApple OSS Distributions 56*4f1223e8SApple OSS Distributions #include <kern/queue.h> 57*4f1223e8SApple OSS Distributions #include <libkern/c++/OSObject.h> 58*4f1223e8SApple OSS Distributions 59*4f1223e8SApple OSS Distributions /*! 60*4f1223e8SApple OSS Distributions * @class IOCommand 61*4f1223e8SApple OSS Distributions * @abstract 62*4f1223e8SApple OSS Distributions * This class is an abstract class which represents an I/O command. 63*4f1223e8SApple OSS Distributions * @discussion 64*4f1223e8SApple OSS Distributions * This class is an abstract class which represents an I/O command passed 65*4f1223e8SApple OSS Distributions * from a device driver to a controller. All controller commands (e.g. IOATACommand) 66*4f1223e8SApple OSS Distributions * should inherit from this class. 67*4f1223e8SApple OSS Distributions */ 68*4f1223e8SApple OSS Distributions 69*4f1223e8SApple OSS Distributions class IOCommand : public OSObject 70*4f1223e8SApple OSS Distributions { 71*4f1223e8SApple OSS Distributions OSDeclareDefaultStructors(IOCommand); 72*4f1223e8SApple OSS Distributions 73*4f1223e8SApple OSS Distributions public: 74*4f1223e8SApple OSS Distributions virtual bool init(void) APPLE_KEXT_OVERRIDE; 75*4f1223e8SApple OSS Distributions 76*4f1223e8SApple OSS Distributions /*! @var fCommandChain 77*4f1223e8SApple OSS Distributions * This variable is used by the current 'owner' to queue the command. During the life cycle of a command it moves through a series of queues. This is the queue pointer for it. Only valid while 'ownership' is clear. For instance a IOCommandPool uses this pointer to maintain its list of free commands. May be manipulated using the kern/queue.h macros */ 78*4f1223e8SApple OSS Distributions queue_chain_t fCommandChain; /* used to queue commands */ 79*4f1223e8SApple OSS Distributions }; 80*4f1223e8SApple OSS Distributions 81*4f1223e8SApple OSS Distributions #endif /* defined(KERNEL) && defined(__cplusplus) */ 82*4f1223e8SApple OSS Distributions 83*4f1223e8SApple OSS Distributions #endif /* _IOKIT_IO_COMMAND_H_ */ 84