1*33de042dSApple OSS Distributions /* 2*33de042dSApple OSS Distributions * Copyright (c) 1998-2020 Apple Computer, Inc. All rights reserved. 3*33de042dSApple OSS Distributions * 4*33de042dSApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5*33de042dSApple OSS Distributions * 6*33de042dSApple OSS Distributions * This file contains Original Code and/or Modifications of Original Code 7*33de042dSApple OSS Distributions * as defined in and that are subject to the Apple Public Source License 8*33de042dSApple OSS Distributions * Version 2.0 (the 'License'). You may not use this file except in 9*33de042dSApple OSS Distributions * compliance with the License. The rights granted to you under the License 10*33de042dSApple OSS Distributions * may not be used to create, or enable the creation or redistribution of, 11*33de042dSApple OSS Distributions * unlawful or unlicensed copies of an Apple operating system, or to 12*33de042dSApple OSS Distributions * circumvent, violate, or enable the circumvention or violation of, any 13*33de042dSApple OSS Distributions * terms of an Apple operating system software license agreement. 14*33de042dSApple OSS Distributions * 15*33de042dSApple OSS Distributions * Please obtain a copy of the License at 16*33de042dSApple OSS Distributions * http://www.opensource.apple.com/apsl/ and read it before using this file. 17*33de042dSApple OSS Distributions * 18*33de042dSApple OSS Distributions * The Original Code and all software distributed under the License are 19*33de042dSApple OSS Distributions * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20*33de042dSApple OSS Distributions * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21*33de042dSApple OSS Distributions * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22*33de042dSApple OSS Distributions * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23*33de042dSApple OSS Distributions * Please see the License for the specific language governing rights and 24*33de042dSApple OSS Distributions * limitations under the License. 25*33de042dSApple OSS Distributions * 26*33de042dSApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27*33de042dSApple OSS Distributions */ 28*33de042dSApple OSS Distributions 29*33de042dSApple OSS Distributions #ifndef _IOGUARDPAGEMEMORYDESCRIPTOR_H 30*33de042dSApple OSS Distributions #define _IOGUARDPAGEMEMORYDESCRIPTOR_H 31*33de042dSApple OSS Distributions 32*33de042dSApple OSS Distributions #include <IOKit/IOMemoryDescriptor.h> 33*33de042dSApple OSS Distributions #include <libkern/c++/OSPtr.h> 34*33de042dSApple OSS Distributions 35*33de042dSApple OSS Distributions /*! 36*33de042dSApple OSS Distributions * @class IOGuardPageMemoryDescriptor 37*33de042dSApple OSS Distributions * @abstract Provides a memory descriptor that allows for variable size guard regions. Use with 38*33de042dSApple OSS Distributions * IOMultiMemoryDescriptor to surround other memory descriptors with guard pages. 39*33de042dSApple OSS Distributions */ 40*33de042dSApple OSS Distributions class IOGuardPageMemoryDescriptor : public IOGeneralMemoryDescriptor 41*33de042dSApple OSS Distributions { 42*33de042dSApple OSS Distributions OSDeclareDefaultStructors(IOGuardPageMemoryDescriptor); 43*33de042dSApple OSS Distributions 44*33de042dSApple OSS Distributions protected: 45*33de042dSApple OSS Distributions virtual void free() APPLE_KEXT_OVERRIDE; 46*33de042dSApple OSS Distributions 47*33de042dSApple OSS Distributions vm_offset_t _buffer; 48*33de042dSApple OSS Distributions vm_size_t _size; 49*33de042dSApple OSS Distributions 50*33de042dSApple OSS Distributions public: 51*33de042dSApple OSS Distributions 52*33de042dSApple OSS Distributions /* @function withSize 53*33de042dSApple OSS Distributions * @discussion Create a IOGuardPageMemoryDescriptor with the specified size. 54*33de042dSApple OSS Distributions * @param Size of the guard region. This will be rounded up to the nearest multiple of page size. 55*33de042dSApple OSS Distributions * @return IOGuardPageMemoryDescriptor instance to be released by the caller, which will free the allocated 56*33de042dSApple OSS Distributions * virtual memory region. 57*33de042dSApple OSS Distributions */ 58*33de042dSApple OSS Distributions static OSPtr<IOGuardPageMemoryDescriptor> withSize(vm_size_t size); 59*33de042dSApple OSS Distributions 60*33de042dSApple OSS Distributions virtual bool initWithSize(vm_size_t size); 61*33de042dSApple OSS Distributions 62*33de042dSApple OSS Distributions private: 63*33de042dSApple OSS Distributions virtual IOReturn doMap(vm_map_t addressMap, 64*33de042dSApple OSS Distributions IOVirtualAddress * atAddress, 65*33de042dSApple OSS Distributions IOOptionBits options, 66*33de042dSApple OSS Distributions IOByteCount sourceOffset = 0, 67*33de042dSApple OSS Distributions IOByteCount length = 0 ) APPLE_KEXT_OVERRIDE; 68*33de042dSApple OSS Distributions }; 69*33de042dSApple OSS Distributions 70*33de042dSApple OSS Distributions #endif /* !_IOGUARDPAGEMEMORYDESCRIPTOR_H */ 71