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

/*
 * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 *
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 *
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 *
 * The 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, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 *
 * @APPLE_OSREFERENCE_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() APPLE_KEXT_OVERRIDE;

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 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 addr64_t getPhysicalSegment( IOByteCount   offset,
	    IOByteCount * length,
	    IOOptionBits  options = 0 ) APPLE_KEXT_OVERRIDE;

/*! @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) APPLE_KEXT_OVERRIDE;

/*! @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) APPLE_KEXT_OVERRIDE;

	virtual IOReturn setPurgeable(IOOptionBits newState, IOOptionBits * oldState) APPLE_KEXT_OVERRIDE;

	IOReturn setOwnership(task_t newOwner, int newLedgerTag, IOOptionBits newOptions);

/*! @function getPageCounts
 *   @abstract Retrieve the number of resident and/or dirty pages encompassed by an IOMemoryDescriptor.
 *   @discussion This method returns the number of resident and/or dirty pages encompassed by an IOMemoryDescriptor.
 *   @param residentPageCount - If non-null, a pointer to a byte count that will return the number of resident pages encompassed by this IOMemoryDescriptor.
 *   @param dirtyPageCount - If non-null, a pointer to a byte count that will return the number of dirty pages encompassed by this IOMemoryDescriptor.
 *   @result An IOReturn code. */

	IOReturn getPageCounts(IOByteCount * residentPageCount,
	    IOByteCount * dirtyPageCount);

	virtual uint64_t getPreparationID( void ) APPLE_KEXT_OVERRIDE;

#define IOMULTIMEMORYDESCRIPTOR_SUPPORTS_GETPAGECOUNTS  1

private:
	virtual IOReturn doMap(vm_map_t           addressMap,
	    IOVirtualAddress * atAddress,
	    IOOptionBits       options,
	    IOByteCount        sourceOffset = 0,
	    IOByteCount        length = 0 ) APPLE_KEXT_OVERRIDE;
};

#endif /* !_IOMULTIMEMORYDESCRIPTOR_H */
Commit	Line	Data
1c79356b A	1	/*
	2	* Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
	3	*
2d21ac55	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
0a7de745	5	*
2d21ac55 A	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. The rights granted to you under the License
	10	* may not be used to create, or enable the creation or redistribution of,
	11	* unlawful or unlicensed copies of an Apple operating system, or to
	12	* circumvent, violate, or enable the circumvention or violation of, any
	13	* terms of an Apple operating system software license agreement.
0a7de745	14	*
2d21ac55 A	15	* Please obtain a copy of the License at
2d21ac55 A	16	* http://www.opensource.apple.com/apsl/ and read it before using this file.
0a7de745	17	*
2d21ac55 A	18	* The Original Code and all software distributed under the License are
2d21ac55 A	19	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
8f6c56a5 A	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
8f6c56a5 A	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
2d21ac55 A	22	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	23	* Please see the License for the specific language governing rights and
	24	* limitations under the License.
0a7de745	25	*
2d21ac55	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
1c79356b A	27	*/
	28
	29	#ifndef _IOMULTIMEMORYDESCRIPTOR_H
	30	#define _IOMULTIMEMORYDESCRIPTOR_H
	31
	32	#include <IOKit/IOMemoryDescriptor.h>
	33
	34	/*! @class IOMultiMemoryDescriptor : public IOMemoryDescriptor
0a7de745 A	35	* @abstract The IOMultiMemoryDescriptor object describes a memory area made up of several other IOMemoryDescriptors.
0a7de745 A	36	* @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. */
1c79356b A	37
	38	class IOMultiMemoryDescriptor : public IOMemoryDescriptor
	39	{
0a7de745	40	OSDeclareDefaultStructors(IOMultiMemoryDescriptor);
1c79356b A	41
	42	protected:
	43
0a7de745 A	44	IOMemoryDescriptor ** _descriptors;
	45	UInt32 _descriptorsCount;
	46	bool _descriptorsIsAllocated;
1c79356b	47
0a7de745	48	virtual void free() APPLE_KEXT_OVERRIDE;
1c79356b	49
1c79356b A	50	public:
	51
	52	/*! @function withDescriptors
0a7de745 A	53	* @abstract Create an IOMultiMemoryDescriptor to describe a memory area made up of several other IOMemoryDescriptors.
	54	* @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.
	55	* @param descriptors An array of IOMemoryDescriptors which make up the memory to be described.
	56	* @param withCount The object count for the descriptors array.
	57	* @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.
	58	* @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.
	59	* @result The created IOMultiMemoryDescriptor on success, to be released by the caller, or zero on failure. */
	60
	61	static IOMultiMemoryDescriptor * withDescriptors(
	62	IOMemoryDescriptor ** descriptors,
	63	UInt32 withCount,
	64	IODirection withDirection,
	65	bool asReference = false );
1c79356b A	66
1c79356b A	67	/*! @function withDescriptors
0a7de745 A	68	* @abstract Initialize an IOMultiMemoryDescriptor to describe a memory area made up of several other IOMemoryDescriptors.
	69	* @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.
	70	* @param descriptors An array of IOMemoryDescriptors which make up the memory to be described.
	71	* @param withCount The object count for the descriptors array.
	72	* @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.
	73	* @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.
	74	* @result The created IOMultiMemoryDescriptor on success, to be released by the caller, or zero on failure. */
	75
	76	virtual bool initWithDescriptors(
	77	IOMemoryDescriptor ** descriptors,
	78	UInt32 withCount,
	79	IODirection withDirection,
	80	bool asReference = false );
1c79356b	81
b0d623f7	82	/*! @function getPhysicalSegment
0a7de745 A	83	* @abstract Break a memory descriptor into its physically contiguous segments.
	84	* @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.
	85	* @param offset A byte offset into the memory whose physical address to return.
	86	* @param length If non-zero, getPhysicalSegment will store here the length of the physically contiguous segement at the given offset.
	87	* @result A physical address, or zero if the offset is beyond the length of the memory. */
1c79356b	88
0a7de745 A	89	virtual addr64_t getPhysicalSegment( IOByteCount offset,
	90	IOByteCount * length,
	91	IOOptionBits options = 0 ) APPLE_KEXT_OVERRIDE;
0c530ab8	92
1c79356b	93	/*! @function prepare
0a7de745 A	94	* @abstract Prepare the memory for an I/O transfer.
	95	* @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.
	96	* @param forDirection The direction of the I/O just completed, or kIODirectionNone for the direction specified by the memory descriptor.
	97	* @result An IOReturn code. */
1c79356b	98
0a7de745	99	virtual IOReturn prepare(IODirection forDirection = kIODirectionNone) APPLE_KEXT_OVERRIDE;
1c79356b A	100
1c79356b A	101	/*! @function complete
0a7de745 A	102	* @abstract Complete processing of the memory after an I/O transfer finishes.
	103	* @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.
	104	* @param forDirection The direction of the I/O just completed, or kIODirectionNone for the direction specified by the memory descriptor.
	105	* @result An IOReturn code. */
1c79356b	106
0a7de745	107	virtual IOReturn complete(IODirection forDirection = kIODirectionNone) APPLE_KEXT_OVERRIDE;
3e170ce0	108
0a7de745	109	virtual IOReturn setPurgeable(IOOptionBits newState, IOOptionBits * oldState) APPLE_KEXT_OVERRIDE;
3e170ce0	110
cb323159 A	111	IOReturn setOwnership(task_t newOwner, int newLedgerTag, IOOptionBits newOptions);
cb323159 A	112
3e170ce0	113	/*! @function getPageCounts
0a7de745 A	114	* @abstract Retrieve the number of resident and/or dirty pages encompassed by an IOMemoryDescriptor.
	115	* @discussion This method returns the number of resident and/or dirty pages encompassed by an IOMemoryDescriptor.
	116	* @param residentPageCount - If non-null, a pointer to a byte count that will return the number of resident pages encompassed by this IOMemoryDescriptor.
	117	* @param dirtyPageCount - If non-null, a pointer to a byte count that will return the number of dirty pages encompassed by this IOMemoryDescriptor.
	118	* @result An IOReturn code. */
3e170ce0	119
0a7de745 A	120	IOReturn getPageCounts(IOByteCount * residentPageCount,
0a7de745 A	121	IOByteCount * dirtyPageCount);
3e170ce0	122
0a7de745	123	virtual uint64_t getPreparationID( void ) APPLE_KEXT_OVERRIDE;
d9a64523	124
0a7de745	125	#define IOMULTIMEMORYDESCRIPTOR_SUPPORTS_GETPAGECOUNTS 1
3e170ce0 A	126
3e170ce0 A	127	private:
0a7de745 A	128	virtual IOReturn doMap(vm_map_t addressMap,
	129	IOVirtualAddress * atAddress,
	130	IOOptionBits options,
	131	IOByteCount sourceOffset = 0,
	132	IOByteCount length = 0 ) APPLE_KEXT_OVERRIDE;
1c79356b A	133	};
	134
	135	#endif /* !_IOMULTIMEMORYDESCRIPTOR_H */