1*42e22086SApple OSS Distributions /* 2*42e22086SApple OSS Distributions * Copyright (c) 1998-2020 Apple Computer, Inc. All rights reserved. 3*42e22086SApple OSS Distributions * 4*42e22086SApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5*42e22086SApple OSS Distributions * 6*42e22086SApple OSS Distributions * This file contains Original Code and/or Modifications of Original Code 7*42e22086SApple OSS Distributions * as defined in and that are subject to the Apple Public Source License 8*42e22086SApple OSS Distributions * Version 2.0 (the 'License'). You may not use this file except in 9*42e22086SApple OSS Distributions * compliance with the License. The rights granted to you under the License 10*42e22086SApple OSS Distributions * may not be used to create, or enable the creation or redistribution of, 11*42e22086SApple OSS Distributions * unlawful or unlicensed copies of an Apple operating system, or to 12*42e22086SApple OSS Distributions * circumvent, violate, or enable the circumvention or violation of, any 13*42e22086SApple OSS Distributions * terms of an Apple operating system software license agreement. 14*42e22086SApple OSS Distributions * 15*42e22086SApple OSS Distributions * Please obtain a copy of the License at 16*42e22086SApple OSS Distributions * http://www.opensource.apple.com/apsl/ and read it before using this file. 17*42e22086SApple OSS Distributions * 18*42e22086SApple OSS Distributions * The Original Code and all software distributed under the License are 19*42e22086SApple OSS Distributions * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20*42e22086SApple OSS Distributions * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21*42e22086SApple OSS Distributions * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22*42e22086SApple OSS Distributions * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23*42e22086SApple OSS Distributions * Please see the License for the specific language governing rights and 24*42e22086SApple OSS Distributions * limitations under the License. 25*42e22086SApple OSS Distributions * 26*42e22086SApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27*42e22086SApple OSS Distributions */ 28*42e22086SApple OSS Distributions 29*42e22086SApple OSS Distributions #ifndef _IOGUARDPAGEMEMORYDESCRIPTOR_H 30*42e22086SApple OSS Distributions #define _IOGUARDPAGEMEMORYDESCRIPTOR_H 31*42e22086SApple OSS Distributions 32*42e22086SApple OSS Distributions #include <IOKit/IOMemoryDescriptor.h> 33*42e22086SApple OSS Distributions #include <libkern/c++/OSPtr.h> 34*42e22086SApple OSS Distributions 35*42e22086SApple OSS Distributions /*! 36*42e22086SApple OSS Distributions * @class IOGuardPageMemoryDescriptor 37*42e22086SApple OSS Distributions * @abstract Provides a memory descriptor that allows for variable size guard regions. Use with 38*42e22086SApple OSS Distributions * IOMultiMemoryDescriptor to surround other memory descriptors with guard pages. 39*42e22086SApple OSS Distributions */ 40*42e22086SApple OSS Distributions class IOGuardPageMemoryDescriptor : public IOGeneralMemoryDescriptor 41*42e22086SApple OSS Distributions { 42*42e22086SApple OSS Distributions OSDeclareDefaultStructors(IOGuardPageMemoryDescriptor); 43*42e22086SApple OSS Distributions 44*42e22086SApple OSS Distributions protected: 45*42e22086SApple OSS Distributions virtual void free() APPLE_KEXT_OVERRIDE; 46*42e22086SApple OSS Distributions 47*42e22086SApple OSS Distributions vm_offset_t _buffer; 48*42e22086SApple OSS Distributions vm_size_t _size; 49*42e22086SApple OSS Distributions 50*42e22086SApple OSS Distributions public: 51*42e22086SApple OSS Distributions 52*42e22086SApple OSS Distributions /* @function withSize 53*42e22086SApple OSS Distributions * @discussion Create a IOGuardPageMemoryDescriptor with the specified size. 54*42e22086SApple OSS Distributions * @param Size of the guard region. This will be rounded up to the nearest multiple of page size. 55*42e22086SApple OSS Distributions * @return IOGuardPageMemoryDescriptor instance to be released by the caller, which will free the allocated 56*42e22086SApple OSS Distributions * virtual memory region. 57*42e22086SApple OSS Distributions */ 58*42e22086SApple OSS Distributions static OSPtr<IOGuardPageMemoryDescriptor> withSize(vm_size_t size); 59*42e22086SApple OSS Distributions 60*42e22086SApple OSS Distributions virtual bool initWithSize(vm_size_t size); 61*42e22086SApple OSS Distributions 62*42e22086SApple OSS Distributions private: 63*42e22086SApple OSS Distributions virtual IOReturn doMap(vm_map_t addressMap, 64*42e22086SApple OSS Distributions IOVirtualAddress * atAddress, 65*42e22086SApple OSS Distributions IOOptionBits options, 66*42e22086SApple OSS Distributions IOByteCount sourceOffset = 0, 67*42e22086SApple OSS Distributions IOByteCount length = 0 ) APPLE_KEXT_OVERRIDE; 68*42e22086SApple OSS Distributions }; 69*42e22086SApple OSS Distributions 70*42e22086SApple OSS Distributions #endif /* !_IOGUARDPAGEMEMORYDESCRIPTOR_H */ 71