FreeBSD/Linux Kernel Cross Reference
sys/iokit/IOKit/IOInterleavedMemoryDescriptor.h

     /*
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      *
      * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
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     * Please obtain a copy of the License at
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    #ifndef _IOINTERLEAVEDMEMORYDESCRIPTOR_H
    #define _IOINTERLEAVEDMEMORYDESCRIPTOR_H
    
    #include <IOKit/IOMemoryDescriptor.h>
    
    /*! @class IOInterleavedMemoryDescriptor : public IOMemoryDescriptor
        @abstract The IOInterleavedMemoryDescriptor object describes a memory area made up of portions of several other IOMemoryDescriptors.
        @discussion The IOInterleavedMemoryDescriptor object represents interleaved ranges of memory, specified as an ordered list of portions of individual IOMemoryDescriptors.  The portions are chained end-to-end to make up a single contiguous buffer. */
    
    class IOInterleavedMemoryDescriptor : public IOMemoryDescriptor
    {
        OSDeclareDefaultStructors(IOInterleavedMemoryDescriptor);
    
    protected:
    
        UInt32                _descriptorCapacity;
        UInt32                _descriptorCount;
        IOMemoryDescriptor ** _descriptors;
        IOByteCount         * _descriptorOffsets;
        IOByteCount         * _descriptorLengths;
        bool                  _descriptorPrepared;
    
        virtual void free();
    
        /*
         * These methods are not supported under this subclass.
         */
    
        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 );
    
        virtual void * getVirtualSegment( IOByteCount   offset,  /* not supported */
                                          IOByteCount * length );
    
        IOMemoryDescriptor::withAddress;                         /* not supported */
        IOMemoryDescriptor::withPhysicalAddress;                 /* not supported */
        IOMemoryDescriptor::withPhysicalRanges;                  /* not supported */
        IOMemoryDescriptor::withRanges;                          /* not supported */
        IOMemoryDescriptor::withSubRange;                        /* not supported */
    
    public:
    
    /*! @function withCapacity
        @abstract Create an IOInterleavedMemoryDescriptor to describe a memory area made up of several other IOMemoryDescriptors.
        @discussion This method creates and initializes an IOInterleavedMemoryDescriptor for memory consisting of portions of a number of other IOMemoryDescriptors, chained end-to-end (in the order they appear in the array) to represent a single contiguous memory buffer.
        @param capacity The maximum number of IOMemoryDescriptors that may be subsequently added to this IOInterleavedMemoryDescriptor.
        @param direction An I/O direction to be associated with the descriptor, which may affect the operation of the prepare and complete methods on some architectures.
        @result The created IOInterleavedMemoryDescriptor on success, to be released by the caller, or zero on failure. */
   
       static IOInterleavedMemoryDescriptor * withCapacity( UInt32                capacity,
                                                            IODirection           direction);
   
   /*! @function initWithCapacity
       @abstract Initialize an IOInterleavedMemoryDescriptor to describe a memory area made up of several other IOMemoryDescriptors.
       @discussion This method initializes an IOInterleavedMemoryDescriptor for memory consisting of portions of a number of other IOMemoryDescriptors, chained end-to-end (in the order they appear in the array) to represent a single contiguous memory buffer.
       @param capacity The maximum number of IOMemoryDescriptors that may be subsequently added to this IOInterleavedMemoryDescriptor.
       @param direction An I/O direction to be associated with the descriptor, which may affect the operation of the prepare and complete methods on some architectures.
       @result The created IOInterleavedMemoryDescriptor on success, to be released by the caller, or zero on failure. */
   
       virtual bool initWithCapacity( UInt32                capacity,
                                      IODirection           direction );
   
   /*! @function clearMemoryDescriptors
       @abstract Clear all of the IOMemoryDescriptors currently contained in and reset the IOInterleavedMemoryDescriptor.
       @discussion Clears each IOMemoryDescriptor by completing (if needed) and releasing.  The IOInterleavedMemoryDescriptor is then reset and may accept new descriptors up to the capacity specified when it was created.
       @param direction An I/O direction to be associated with the descriptor, which may affect the operation of the prepare and complete methods on some architectures. */
   
       virtual void clearMemoryDescriptors( IODirection direction = kIODirectionNone );
   
   /*! @function setMemoryDescriptor
       @abstract Add a portion of an IOMemoryDescriptor to the IOInterleavedMemoryDescriptor.
       @discussion This method adds the portion of an IOMemoryDescriptor described by the offset and length parameters to the end of the IOInterleavedMemoryDescriptor.  A single IOMemoryDescriptor may be added as many times as there is room for it.  The offset and length must describe a portion entirely within the IOMemoryDescriptor.
       @param descriptor An IOMemoryDescriptor to be added to the IOInterleavedMemoryDescriptor.  Its direction must be compatible with that of the IOInterleavedMemoryDescriptor.
       @param offset The offset into the IOMemoryDescriptor of the portion that will be added to the virtualized buffer.
       @param length The length of the portion of the IOMemoryDescriptor to be added to the virtualized buffer. 
       @result Returns true the portion was successfully added. */
   
       virtual bool setMemoryDescriptor( IOMemoryDescriptor * descriptor,
                                         IOByteCount offset,
                                         IOByteCount length );
   
   /*! @function getPhysicalSegment
       @abstract Break a memory descriptor into its physically contiguous segments.
       @discussion This method returns the physical address of the byte at the given offset into the memory, and optionally the length of the physically contiguous segment from that offset.
       @param offset A byte offset into the memory whose physical address to return.
       @param length If non-zero, getPhysicalSegment will store here the length of the physically contiguous segement at the given offset.
       @result A physical address, or zero if the offset is beyond the length of the memory. */
   
       virtual IOPhysicalAddress getPhysicalSegment( IOByteCount   offset,
                                                     IOByteCount * length );
   
       virtual addr64_t getPhysicalSegment64(        IOByteCount   offset,
                                                     IOByteCount * length );
   
   /*! @function prepare
       @abstract Prepare the memory for an I/O transfer.
       @discussion This involves paging in the memory, if necessary, and wiring it down for the duration of the transfer.  The complete() method completes the processing of the memory after the I/O transfer finishes.  This method need not called for non-pageable memory.
       @param forDirection The direction of the I/O to be performed, or kIODirectionNone for the direction specified by the memory descriptor.
       @result An IOReturn code. */
   
       virtual IOReturn prepare(IODirection forDirection = kIODirectionNone);
   
   /*! @function complete
       @abstract Complete processing of the memory after an I/O transfer finishes.
       @discussion This method should not be called unless a prepare was previously issued; the prepare() and complete() must occur in pairs, before and after an I/O transfer involving pageable memory.
       @param forDirection The direction of the I/O just completed, or kIODirectionNone for the direction specified by the memory descriptor.
       @result An IOReturn code. */
   
       virtual IOReturn complete(IODirection forDirection = kIODirectionNone);
   
       virtual IOPhysicalAddress getSourceSegment(IOByteCount offset,
                                                  IOByteCount * length);
   };
   
   #endif /* !_IOINTERLEAVEDMEMORYDESCRIPTOR_H */

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