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#ifndef _IOMULTIMEMORYDESCRIPTOR_H
#define _IOMULTIMEMORYDESCRIPTOR_H
#include <IOKit/IOMemoryDescriptor.h>
#include <libkern/c++/OSPtr.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 OSPtr<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 */