1*0f4c859eSApple OSS Distributions /* 2*0f4c859eSApple OSS Distributions * Copyright (c) 1998-2020 Apple Computer, Inc. All rights reserved. 3*0f4c859eSApple OSS Distributions * 4*0f4c859eSApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5*0f4c859eSApple OSS Distributions * 6*0f4c859eSApple OSS Distributions * This file contains Original Code and/or Modifications of Original Code 7*0f4c859eSApple OSS Distributions * as defined in and that are subject to the Apple Public Source License 8*0f4c859eSApple OSS Distributions * Version 2.0 (the 'License'). You may not use this file except in 9*0f4c859eSApple OSS Distributions * compliance with the License. The rights granted to you under the License 10*0f4c859eSApple OSS Distributions * may not be used to create, or enable the creation or redistribution of, 11*0f4c859eSApple OSS Distributions * unlawful or unlicensed copies of an Apple operating system, or to 12*0f4c859eSApple OSS Distributions * circumvent, violate, or enable the circumvention or violation of, any 13*0f4c859eSApple OSS Distributions * terms of an Apple operating system software license agreement. 14*0f4c859eSApple OSS Distributions * 15*0f4c859eSApple OSS Distributions * Please obtain a copy of the License at 16*0f4c859eSApple OSS Distributions * http://www.opensource.apple.com/apsl/ and read it before using this file. 17*0f4c859eSApple OSS Distributions * 18*0f4c859eSApple OSS Distributions * The Original Code and all software distributed under the License are 19*0f4c859eSApple OSS Distributions * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20*0f4c859eSApple OSS Distributions * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21*0f4c859eSApple OSS Distributions * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22*0f4c859eSApple OSS Distributions * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23*0f4c859eSApple OSS Distributions * Please see the License for the specific language governing rights and 24*0f4c859eSApple OSS Distributions * limitations under the License. 25*0f4c859eSApple OSS Distributions * 26*0f4c859eSApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27*0f4c859eSApple OSS Distributions */ 28*0f4c859eSApple OSS Distributions 29*0f4c859eSApple OSS Distributions #ifndef _IOGUARDPAGEMEMORYDESCRIPTOR_H 30*0f4c859eSApple OSS Distributions #define _IOGUARDPAGEMEMORYDESCRIPTOR_H 31*0f4c859eSApple OSS Distributions 32*0f4c859eSApple OSS Distributions #include <IOKit/IOMemoryDescriptor.h> 33*0f4c859eSApple OSS Distributions #include <libkern/c++/OSPtr.h> 34*0f4c859eSApple OSS Distributions 35*0f4c859eSApple OSS Distributions /*! 36*0f4c859eSApple OSS Distributions * @class IOGuardPageMemoryDescriptor 37*0f4c859eSApple OSS Distributions * @abstract Provides a memory descriptor that allows for variable size guard regions. Use with 38*0f4c859eSApple OSS Distributions * IOMultiMemoryDescriptor to surround other memory descriptors with guard pages. 39*0f4c859eSApple OSS Distributions */ 40*0f4c859eSApple OSS Distributions class IOGuardPageMemoryDescriptor : public IOGeneralMemoryDescriptor 41*0f4c859eSApple OSS Distributions { 42*0f4c859eSApple OSS Distributions OSDeclareDefaultStructors(IOGuardPageMemoryDescriptor); 43*0f4c859eSApple OSS Distributions 44*0f4c859eSApple OSS Distributions protected: 45*0f4c859eSApple OSS Distributions virtual void free() APPLE_KEXT_OVERRIDE; 46*0f4c859eSApple OSS Distributions 47*0f4c859eSApple OSS Distributions vm_offset_t _buffer; 48*0f4c859eSApple OSS Distributions vm_size_t _size; 49*0f4c859eSApple OSS Distributions 50*0f4c859eSApple OSS Distributions public: 51*0f4c859eSApple OSS Distributions 52*0f4c859eSApple OSS Distributions /* @function withSize 53*0f4c859eSApple OSS Distributions * @discussion Create a IOGuardPageMemoryDescriptor with the specified size. 54*0f4c859eSApple OSS Distributions * @param Size of the guard region. This will be rounded up to the nearest multiple of page size. 55*0f4c859eSApple OSS Distributions * @return IOGuardPageMemoryDescriptor instance to be released by the caller, which will free the allocated 56*0f4c859eSApple OSS Distributions * virtual memory region. 57*0f4c859eSApple OSS Distributions */ 58*0f4c859eSApple OSS Distributions static OSPtr<IOGuardPageMemoryDescriptor> withSize(vm_size_t size); 59*0f4c859eSApple OSS Distributions 60*0f4c859eSApple OSS Distributions virtual bool initWithSize(vm_size_t size); 61*0f4c859eSApple OSS Distributions 62*0f4c859eSApple OSS Distributions private: 63*0f4c859eSApple OSS Distributions virtual IOReturn doMap(vm_map_t addressMap, 64*0f4c859eSApple OSS Distributions IOVirtualAddress * atAddress, 65*0f4c859eSApple OSS Distributions IOOptionBits options, 66*0f4c859eSApple OSS Distributions IOByteCount sourceOffset = 0, 67*0f4c859eSApple OSS Distributions IOByteCount length = 0 ) APPLE_KEXT_OVERRIDE; 68*0f4c859eSApple OSS Distributions }; 69*0f4c859eSApple OSS Distributions 70*0f4c859eSApple OSS Distributions #endif /* !_IOGUARDPAGEMEMORYDESCRIPTOR_H */ 71