[apple/xnu.git] / iokit / IOKit / IOMultiMemoryDescriptor.h

/*
 * 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 _IOMULTIMEMORYDESCRIPTOR_H
#define _IOMULTIMEMORYDESCRIPTOR_H

#include <IOKit/IOMemoryDescriptor.h>

/*! @class IOMultiMemoryDescriptor : public IOMemoryDescriptor
    @abstract The IOMultiMemoryDescriptor object describes a memory area made up of several other IOMemoryDescriptors.
    @discussion The IOMultiMemoryDescriptor object represents multiple ranges of memory, specified as an ordered list of IOMemoryDescriptors.  The descriptors are chained end-to-end to make up a single contiguous buffer. */

class IOMultiMemoryDescriptor : public IOMemoryDescriptor
{
    OSDeclareDefaultStructors(IOMultiMemoryDescriptor);

protected:

    IOMemoryDescriptor ** _descriptors;
    UInt32                _descriptorsCount;
    bool                  _descriptorsIsAllocated;

    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 withDescriptors
    @abstract Create an IOMultiMemoryDescriptor to describe a memory area made up of several other IOMemoryDescriptors.
    @discussion This method creates and initializes an IOMultiMemoryDescriptor for memory consisting 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.  Passing the descriptor array as a reference will avoid an extra allocation.
    @param descriptors An array of IOMemoryDescriptors which make up the memory to be described.
    @param withCount The object count for the descriptors array.
    @param withDirection An I/O direction to be associated with the descriptor, which may affect the operation of the prepare and complete methods on some architectures.
    @param asReference If false, the IOMultiMemoryDescriptor object will make a copy of the descriptors array, otherwise, the array will be used in situ, avoiding an extra allocation.
    @result The created IOMultiMemoryDescriptor on success, to be released by the caller, or zero on failure. */

    static IOMultiMemoryDescriptor * withDescriptors(
                                  IOMemoryDescriptor ** descriptors,
                                  UInt32                withCount,
                                  IODirection           withDirection,
                                  bool                  asReference = false );

/*! @function withDescriptors
    @abstract Initialize an IOMultiMemoryDescriptor to describe a memory area made up of several other IOMemoryDescriptors.
    @discussion This method initializes an IOMultiMemoryDescriptor for memory consisting 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.  Passing the descriptor array as a reference will avoid an extra allocation.
    @param descriptors An array of IOMemoryDescriptors which make up the memory to be described.
    @param withCount The object count for the descriptors array.
    @param withDirection An I/O direction to be associated with the descriptor, which may affect the operation of the prepare and complete methods on some architectures.
    @param asReference If false, the IOMultiMemoryDescriptor object will make a copy of the descriptors array, otherwise, the array will be used in situ, avoiding an extra allocation.
    @result The created IOMultiMemoryDescriptor on success, to be released by the caller, or zero on failure. */

    virtual bool initWithDescriptors(
                                  IOMemoryDescriptor ** descriptors,
                                  UInt32                withCount,
                                  IODirection           withDirection,
                                  bool                  asReference = false );

/*! @function getPhysicalAddress
    @abstract Return the physical address of the first byte in the memory.
    @discussion This method returns the physical address of the  first byte in the memory. It is most useful on memory known to be physically contiguous.
    @result A physical address. */

    virtual IOPhysicalAddress getPhysicalSegment( 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 needn't called for non-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 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);

/*! @function readBytes
    @abstract Copy data from the memory descriptor's buffer to the specified buffer.
    @discussion This method copies data from the memory descriptor's memory at the given offset, to the caller's buffer.
    @param offset A byte offset into the memory descriptor's memory.
    @param bytes The caller supplied buffer to copy the data to.
    @param withLength The length of the data to copy.
    @result The number of bytes copied, zero will be returned if the specified offset is beyond the length of the descriptor. */

    virtual IOByteCount readBytes( IOByteCount offset,
                                   void *      bytes,
                                   IOByteCount withLength );

/*! @function writeBytes
    @abstract Copy data to the memory descriptor's buffer from the specified buffer.
    @discussion This method copies data to the memory descriptor's memory at the given offset, from the caller's buffer.
    @param offset A byte offset into the memory descriptor's memory.
    @param bytes The caller supplied buffer to copy the data from.
    @param withLength The length of the data to copy.
    @result The number of bytes copied, zero will be returned if the specified offset is beyond the length of the descriptor. */

    virtual IOByteCount writeBytes( IOByteCount  offset,
                                    const void * bytes,
                                    IOByteCount  withLength );
};

#endif /* !_IOMULTIMEMORYDESCRIPTOR_H */
Commit	Line	Data
1c79356b A	1	/*
	2	* Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
	6	* The contents of this file constitute Original Code as defined in and
	7	* are subject to the Apple Public Source License Version 1.1 (the
	8	* "License"). You may not use this file except in compliance with the
	9	* License. Please obtain a copy of the License at
	10	* http://www.apple.com/publicsource and read it before using this file.
	11	*
	12	* This Original Code and all software distributed under the License are
	13	* distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	14	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	15	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	16	* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
	17	* License for the specific language governing rights and limitations
	18	* under the License.
	19	*
	20	* @APPLE_LICENSE_HEADER_END@
	21	*/
	22
	23	#ifndef _IOMULTIMEMORYDESCRIPTOR_H
	24	#define _IOMULTIMEMORYDESCRIPTOR_H
	25
	26	#include <IOKit/IOMemoryDescriptor.h>
	27
	28	/*! @class IOMultiMemoryDescriptor : public IOMemoryDescriptor
	29	@abstract The IOMultiMemoryDescriptor object describes a memory area made up of several other IOMemoryDescriptors.
	30	@discussion The IOMultiMemoryDescriptor object represents multiple ranges of memory, specified as an ordered list of IOMemoryDescriptors. The descriptors are chained end-to-end to make up a single contiguous buffer. */
	31
	32	class IOMultiMemoryDescriptor : public IOMemoryDescriptor
	33	{
	34	OSDeclareDefaultStructors(IOMultiMemoryDescriptor);
	35
	36	protected:
	37
	38	IOMemoryDescriptor ** _descriptors;
	39	UInt32 _descriptorsCount;
	40	bool _descriptorsIsAllocated;
	41
	42	virtual void free();
	43
	44	/*
	45	* These methods are not supported under this subclass.
	46	*/
	47
	48	virtual bool initWithAddress( void * address, /* not supported */
	49	IOByteCount withLength,
	50	IODirection withDirection );
	51
	52	virtual bool initWithAddress( vm_address_t address, /* not supported */
	53	IOByteCount withLength,
	54	IODirection withDirection,
	55	task_t withTask );
	56
	57	virtual bool initWithPhysicalAddress(
	58	IOPhysicalAddress address, /* not supported */
	59	IOByteCount withLength,
	60	IODirection withDirection );
	61
	62	virtual bool initWithPhysicalRanges(
	63	IOPhysicalRange * ranges, /* not supported */
	64	UInt32 withCount,
65	IODirection withDirection,
66	bool asReference = false );
67
68	virtual bool initWithRanges( IOVirtualRange * ranges, /* not supported */
69	UInt32 withCount,
70	IODirection withDirection,
71	task_t withTask,
72	bool asReference = false );
73
74	virtual void * getVirtualSegment( IOByteCount offset, /* not supported */
75	IOByteCount * length );
76
77	IOMemoryDescriptor::withAddress; /* not supported */
78	IOMemoryDescriptor::withPhysicalAddress; /* not supported */
79	IOMemoryDescriptor::withPhysicalRanges; /* not supported */
80	IOMemoryDescriptor::withRanges; /* not supported */
81	IOMemoryDescriptor::withSubRange; /* not supported */
82
83	public:
84
85	/*! @function withDescriptors
86	@abstract Create an IOMultiMemoryDescriptor to describe a memory area made up of several other IOMemoryDescriptors.
87	@discussion This method creates and initializes an IOMultiMemoryDescriptor for memory consisting 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. Passing the descriptor array as a reference will avoid an extra allocation.
88	@param descriptors An array of IOMemoryDescriptors which make up the memory to be described.
89	@param withCount The object count for the descriptors array.
90	@param withDirection An I/O direction to be associated with the descriptor, which may affect the operation of the prepare and complete methods on some architectures.
91	@param asReference If false, the IOMultiMemoryDescriptor object will make a copy of the descriptors array, otherwise, the array will be used in situ, avoiding an extra allocation.
92	@result The created IOMultiMemoryDescriptor on success, to be released by the caller, or zero on failure. */
93
94	static IOMultiMemoryDescriptor * withDescriptors(
95	IOMemoryDescriptor ** descriptors,
96	UInt32 withCount,
97	IODirection withDirection,
98	bool asReference = false );
99
100	/*! @function withDescriptors
101	@abstract Initialize an IOMultiMemoryDescriptor to describe a memory area made up of several other IOMemoryDescriptors.
102	@discussion This method initializes an IOMultiMemoryDescriptor for memory consisting 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. Passing the descriptor array as a reference will avoid an extra allocation.
103	@param descriptors An array of IOMemoryDescriptors which make up the memory to be described.
104	@param withCount The object count for the descriptors array.
105	@param withDirection An I/O direction to be associated with the descriptor, which may affect the operation of the prepare and complete methods on some architectures.
106	@param asReference If false, the IOMultiMemoryDescriptor object will make a copy of the descriptors array, otherwise, the array will be used in situ, avoiding an extra allocation.
107	@result The created IOMultiMemoryDescriptor on success, to be released by the caller, or zero on failure. */
108
109	virtual bool initWithDescriptors(
110	IOMemoryDescriptor ** descriptors,
111	UInt32 withCount,
112	IODirection withDirection,
113	bool asReference = false );
114
115	/*! @function getPhysicalAddress
116	@abstract Return the physical address of the first byte in the memory.
117	@discussion This method returns the physical address of the first byte in the memory. It is most useful on memory known to be physically contiguous.
118	@result A physical address. */
119
120	virtual IOPhysicalAddress getPhysicalSegment( IOByteCount offset,
121	IOByteCount * length );
122
123	/*! @function prepare
124	@abstract Prepare the memory for an I/O transfer.
125	@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 needn't called for non-pageable memory.
126	@param forDirection The direction of the I/O just completed, or kIODirectionNone for the direction specified by the memory descriptor.
127	@result An IOReturn code. */
128
129	virtual IOReturn prepare(IODirection forDirection = kIODirectionNone);
130
131	/*! @function complete
132	@abstract Complete processing of the memory after an I/O transfer finishes.
133	@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.
134	@param forDirection The direction of the I/O just completed, or kIODirectionNone for the direction specified by the memory descriptor.
135	@result An IOReturn code. */
136
137	virtual IOReturn complete(IODirection forDirection = kIODirectionNone);
138
139	/*! @function readBytes
140	@abstract Copy data from the memory descriptor's buffer to the specified buffer.
141	@discussion This method copies data from the memory descriptor's memory at the given offset, to the caller's buffer.
142	@param offset A byte offset into the memory descriptor's memory.
143	@param bytes The caller supplied buffer to copy the data to.
144	@param withLength The length of the data to copy.
145	@result The number of bytes copied, zero will be returned if the specified offset is beyond the length of the descriptor. */
146
147	virtual IOByteCount readBytes( IOByteCount offset,
148	void * bytes,
149	IOByteCount withLength );
150
151	/*! @function writeBytes
152	@abstract Copy data to the memory descriptor's buffer from the specified buffer.
153	@discussion This method copies data to the memory descriptor's memory at the given offset, from the caller's buffer.
154	@param offset A byte offset into the memory descriptor's memory.
155	@param bytes The caller supplied buffer to copy the data from.
156	@param withLength The length of the data to copy.
157	@result The number of bytes copied, zero will be returned if the specified offset is beyond the length of the descriptor. */
158
159	virtual IOByteCount writeBytes( IOByteCount offset,
160	const void * bytes,
161	IOByteCount withLength );
162	};
163
164	#endif /* !_IOMULTIMEMORYDESCRIPTOR_H */