iokit/IOKit/IODeviceMemory.h

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42     @discussion The IODeviceMemory class is a simple subclass of IOMemoryDescriptor that uses its methods to describe a single range of physical memory on a device. IODeviceMemory objects are usually looked up with IOService or IOPCIDevice accessors, and are created by memory-mapped bus families. IODeviceMemory implements only some factory methods in addition to the methods of IOMemoryDescriptor.
53     @field length Length of the range.
63     @abstract Constructs an OSArray of IODeviceMemory instances, each describing one physical range, and a tag value.
64     @discussion This method creates IODeviceMemory instances for each physical range passed in an IODeviceMemory::InitElement array. Each element consists of a physical address, length and tag value for the IODeviceMemory. The instances are returned as a created OSArray.
65     @param list An array of IODeviceMemory::InitElement structures.
66     @param count The number of elements in the list.
67     @result Returns a created OSArray of IODeviceMemory objects, to be released by the caller, or zero on failure. */
76     @param address The physical address of the first byte in the memory.
77     @param withLength The length of memory.
85     @abstract Constructs an IODeviceMemory instance, describing a subset of an existing IODeviceMemory range.
86     @discussion This method creates an IODeviceMemory instance for a subset of an existing IODeviceMemory range, passed as a physical address offset and length. It just calls IOMemoryDescriptor::withSubRange.
87     @param of The parent IODeviceMemory of which a subrange is to be used for the new descriptor, which will be retained by the subrange IODeviceMemory.
89     @param length The length of the subrange.
93 	IODeviceMemory *	of,