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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 | /* * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * The contents of this file constitute Original Code as defined in and * are subject to the Apple Public Source License Version 1.1 (the * "License"). You may not use this file except in compliance with the * License. Please obtain a copy of the License at * http://www.apple.com/publicsource and read it before using this file. * * This Original Code and all software distributed under the License are * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the * License for the specific language governing rights and limitations * under the License. * * @APPLE_LICENSE_HEADER_END@ */ #ifndef _IOBUFFERMEMORYDESCRIPTOR_H #define _IOBUFFERMEMORYDESCRIPTOR_H #include <IOKit/IOMemoryDescriptor.h> enum { kIOMemoryDirectionMask = 0x0000000f, kIOMemoryPhysicallyContiguous = 0x00000010, kIOMemoryPageable = 0x00000020, kIOMemorySharingTypeMask = 0x000f0000, kIOMemoryUnshared = 0x00000000, kIOMemoryKernelUserShared = 0x00010000, }; #define _IOBUFFERMEMORYDESCRIPTOR_INTASKWITHOPTIONS_ 1 class IOBufferMemoryDescriptor : public IOGeneralMemoryDescriptor { OSDeclareDefaultStructors(IOBufferMemoryDescriptor); protected: /*! @struct ExpansionData @discussion This structure will be used to expand the capablilties of this class in the future. */ struct ExpansionData { vm_map_t map; }; /*! @var reserved Reserved for future use. (Internal use only) */ ExpansionData * reserved; protected: void * _buffer; vm_size_t _capacity; vm_offset_t _alignment; IOOptionBits _options; IOPhysicalAddress * _physAddrs; unsigned _physSegCount; private: virtual bool initWithOptions( IOOptionBits options, vm_size_t capacity, vm_offset_t alignment, task_t inTask); OSMetaClassDeclareReservedUsed(IOBufferMemoryDescriptor, 0); OSMetaClassDeclareReservedUnused(IOBufferMemoryDescriptor, 1); OSMetaClassDeclareReservedUnused(IOBufferMemoryDescriptor, 2); OSMetaClassDeclareReservedUnused(IOBufferMemoryDescriptor, 3); OSMetaClassDeclareReservedUnused(IOBufferMemoryDescriptor, 4); OSMetaClassDeclareReservedUnused(IOBufferMemoryDescriptor, 5); OSMetaClassDeclareReservedUnused(IOBufferMemoryDescriptor, 6); OSMetaClassDeclareReservedUnused(IOBufferMemoryDescriptor, 7); OSMetaClassDeclareReservedUnused(IOBufferMemoryDescriptor, 8); OSMetaClassDeclareReservedUnused(IOBufferMemoryDescriptor, 9); OSMetaClassDeclareReservedUnused(IOBufferMemoryDescriptor, 10); OSMetaClassDeclareReservedUnused(IOBufferMemoryDescriptor, 11); OSMetaClassDeclareReservedUnused(IOBufferMemoryDescriptor, 12); OSMetaClassDeclareReservedUnused(IOBufferMemoryDescriptor, 13); OSMetaClassDeclareReservedUnused(IOBufferMemoryDescriptor, 14); OSMetaClassDeclareReservedUnused(IOBufferMemoryDescriptor, 15); protected: virtual void free(); virtual bool initWithAddress( void * address, /* not supported */ IOByteCount withLength, IODirection withDirection ); virtual bool initWithAddress( vm_address_t address, /* not supported */ IOByteCount withLength, IODirection withDirection, task_t withTask ); virtual bool initWithPhysicalAddress( IOPhysicalAddress address, /* not supported */ IOByteCount withLength, IODirection withDirection ); virtual bool initWithPhysicalRanges( IOPhysicalRange * ranges, /* not supported */ UInt32 withCount, IODirection withDirection, bool asReference = false ); virtual bool initWithRanges( IOVirtualRange * ranges, /* not supported */ UInt32 withCount, IODirection withDirection, task_t withTask, bool asReference = false ); IOGeneralMemoryDescriptor::withAddress; /* not supported */ IOGeneralMemoryDescriptor::withPhysicalAddress; /* not supported */ IOGeneralMemoryDescriptor::withPhysicalRanges; /* not supported */ IOGeneralMemoryDescriptor::withRanges; /* not supported */ IOGeneralMemoryDescriptor::withSubRange; /* not supported */ public: /* * withOptions: * * Returns a new IOBufferMemoryDescriptor with a buffer large enough to * hold capacity bytes. The descriptor's length is initially set to the * capacity. */ virtual bool initWithOptions( IOOptionBits options, vm_size_t capacity, vm_offset_t alignment); static IOBufferMemoryDescriptor * withOptions( IOOptionBits options, vm_size_t capacity, vm_offset_t alignment = 1); /*! @function inTaskWithOptions @abstract Create a memory buffer with memory descriptor for that buffer. Added in Mac OS X 10.2. @discussion This method allocates a memory buffer with a given size and alignment in the task's address space specified, and returns a memory descriptor instance representing the memory. It is recommended memory allocated for I/O or sharing via mapping be created via IOBufferMemoryDescriptor. Options passed with the request specify the kind of memory to be allocated - pageablity and sharing are specified with option bits. This function may block and so should not be called from interrupt level or while a simple lock is held. @param inTask The task the buffer will be allocated in. @param options Options for the allocation: kIOMemoryPhysicallyContiguous - pass to request memory be physically contiguous. This option is heavily discouraged. The request may fail if memory is fragmented, may cause large amounts of paging activity, and may take a very long time to execute. kIOMemoryPageable - pass to request memory be non-wired - the default for kernel allocated memory is wired. kIOMemoryKernelUserShared - pass to request memory that will be mapped into both the kernel and client applications. @param capacity The number of bytes to allocate. @param alignment The minimum required alignment of the buffer in bytes - 1 is the default for no required alignment. For example, pass 256 to get memory allocated at an address with bits 0-7 zero. @result An instance of class IOBufferMemoryDescriptor. To be released by the caller, which will free the memory desriptor and associated buffer. */ static IOBufferMemoryDescriptor * inTaskWithOptions( task_t inTask, IOOptionBits options, vm_size_t capacity, vm_offset_t alignment = 1); /* * withCapacity: * * Returns a new IOBufferMemoryDescriptor with a buffer large enough to * hold capacity bytes. The descriptor's length is initially set to the * capacity. */ static IOBufferMemoryDescriptor * withCapacity( vm_size_t capacity, IODirection withDirection, bool withContiguousMemory = false); /* * initWithBytes: * * Initialize a new IOBufferMemoryDescriptor preloaded with bytes (copied). * The descriptor's length and capacity are set to the input buffer's size. */ virtual bool initWithBytes(const void * bytes, vm_size_t withLength, IODirection withDirection, bool withContiguousMemory = false); /* * withBytes: * * Returns a new IOBufferMemoryDescriptor preloaded with bytes (copied). * The descriptor's length and capacity are set to the input buffer's size. */ static IOBufferMemoryDescriptor * withBytes( const void * bytes, vm_size_t withLength, IODirection withDirection, bool withContiguousMemory = false); /* * setLength: * * Change the buffer length of the memory descriptor. When a new buffer * is created, the initial length of the buffer is set to be the same as * the capacity. The length can be adjusted via setLength for a shorter * transfer (there is no need to create more buffer descriptors when you * can reuse an existing one, even for different transfer sizes). Note * that the specified length must not exceed the capacity of the buffer. */ virtual void setLength(vm_size_t length); /* * setDirection: * * Change the direction of the transfer. This method allows one to redirect * the descriptor's transfer direction. This eliminates the need to destroy * and create new buffers when different transfer directions are needed. */ virtual void setDirection(IODirection direction); /* * getCapacity: * * Get the buffer capacity */ virtual vm_size_t getCapacity() const; /* * getBytesNoCopy: * * Return the virtual address of the beginning of the buffer */ virtual void *getBytesNoCopy(); /* * getBytesNoCopy: * * Return the virtual address of an offset from the beginning of the buffer */ virtual void *getBytesNoCopy(vm_size_t start, vm_size_t withLength); /* * appendBytes: * * Add some data to the end of the buffer. This method automatically * maintains the memory descriptor buffer length. Note that appendBytes * will not copy past the end of the memory descriptor's current capacity. */ virtual bool appendBytes(const void *bytes, vm_size_t withLength); /* * getPhysicalSegment: * * Get the physical address of the buffer, relative to the current position. * If the current position is at the end of the buffer, a zero is returned. */ virtual IOPhysicalAddress getPhysicalSegment(IOByteCount offset, IOByteCount * length); }; #endif /* !_IOBUFFERMEMORYDESCRIPTOR_H */ |