/*
* Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
*
- * @APPLE_LICENSE_HEADER_START@
- *
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- * License. Please obtain a copy of the License at
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+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
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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. */
+ * @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);
+ OSDeclareDefaultStructors(IOMultiMemoryDescriptor);
protected:
- IOMemoryDescriptor ** _descriptors;
- UInt32 _descriptorsCount;
- bool _descriptorsIsAllocated;
+ IOMemoryDescriptor ** _descriptors;
+ UInt32 _descriptorsCount;
+ bool _descriptorsIsAllocated;
- virtual void free();
+ virtual void free() APPLE_KEXT_OVERRIDE;
- /*
- * These methods are not supported under this subclass.
- */
+public:
- virtual bool initWithAddress( void * address, /* not supported */
- IOByteCount withLength,
- IODirection withDirection );
+/*! @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 );
- virtual bool initWithAddress( vm_address_t address, /* not supported */
- IOByteCount withLength,
- IODirection withDirection,
- task_t withTask );
+/*! @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;
- virtual bool initWithPhysicalAddress(
- IOPhysicalAddress address, /* not supported */
- IOByteCount withLength,
- IODirection withDirection );
+/*! @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 bool initWithPhysicalRanges(
- IOPhysicalRange * ranges, /* not supported */
- UInt32 withCount,
- IODirection withDirection,
- bool asReference = false );
+ virtual IOReturn prepare(IODirection forDirection = kIODirectionNone) APPLE_KEXT_OVERRIDE;
- virtual bool initWithRanges( IOVirtualRange * ranges, /* not supported */
- UInt32 withCount,
- IODirection withDirection,
- task_t withTask,
- bool asReference = false );
+/*! @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 void * getVirtualSegment( IOByteCount offset, /* not supported */
- IOByteCount * length );
+ virtual IOReturn complete(IODirection forDirection = kIODirectionNone) APPLE_KEXT_OVERRIDE;
- IOMemoryDescriptor::withAddress; /* not supported */
- IOMemoryDescriptor::withPhysicalAddress; /* not supported */
- IOMemoryDescriptor::withPhysicalRanges; /* not supported */
- IOMemoryDescriptor::withRanges; /* not supported */
- IOMemoryDescriptor::withSubRange; /* not supported */
+ virtual IOReturn setPurgeable(IOOptionBits newState, IOOptionBits * oldState) APPLE_KEXT_OVERRIDE;
-public:
+ IOReturn setOwnership(task_t newOwner, int newLedgerTag, IOOptionBits newOptions);
-/*! @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 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. */
-/*! @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 );
+ IOReturn getPageCounts(IOByteCount * residentPageCount,
+ IOByteCount * dirtyPageCount);
-/*! @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 uint64_t getPreparationID( void ) APPLE_KEXT_OVERRIDE;
- virtual IOReturn prepare(IODirection forDirection = kIODirectionNone);
+#define IOMULTIMEMORYDESCRIPTOR_SUPPORTS_GETPAGECOUNTS 1
-/*! @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 );
-
- virtual IOPhysicalAddress getSourceSegment(IOByteCount offset,
- IOByteCount * length);
+private:
+ virtual IOReturn doMap(vm_map_t addressMap,
+ IOVirtualAddress * atAddress,
+ IOOptionBits options,
+ IOByteCount sourceOffset = 0,
+ IOByteCount length = 0 ) APPLE_KEXT_OVERRIDE;
};
#endif /* !_IOMULTIMEMORYDESCRIPTOR_H */
projects / apple / xnu.git / blobdiff