AppleEHCItdMemoryBlock.h   [plain text]


/*
 * Copyright  1998-2012 Apple Inc.  All rights reserved.
 * 
 * @APPLE_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. 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
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 * 
 * @APPLE_LICENSE_HEADER_END@
*/

#include <IOKit/IOBufferMemoryDescriptor.h>

#include "AppleUSBEHCI.h"
#include "USBEHCI.h"

class AppleEHCItdMemoryBlock : public OSObject
{
    OSDeclareDefaultStructors(AppleEHCItdMemoryBlock);
    
#define TDsPerBlock	(kEHCIPageSize / sizeof(EHCIGeneralTransferDescriptorShared))

private:
    EHCIGeneralTransferDescriptor		_TDs[TDsPerBlock];
    AppleEHCItdMemoryBlock				*_nextBlock;
	IOBufferMemoryDescriptor			*_buffer;
    
public:

	// OSObject call used to free the buffer when we are done
    virtual void free();

    static AppleEHCItdMemoryBlock		*NewMemoryBlock(void);
    UInt32								NumTDs(void);
    EHCIGeneralTransferDescriptorPtr	GetTD(UInt32 index);
    void								SetNextBlock(AppleEHCItdMemoryBlock *next);
    AppleEHCItdMemoryBlock				*GetNextBlock(void);
    
};