IOCopyMapper.h   [plain text]

/*
 * Copyright (c) 2006 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_OSREFERENCE_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_LICENSE_OSREFERENCE_HEADER_END@
 */
// 45678901234567890123456789012345678901234567890123456789012345678901234567890

#include <libkern/OSAtomic.h>

#include <IOKit/IOLocks.h>
#include <IOKit/IOPlatformExpert.h>
#include <IOKit/IODeviceTreeSupport.h>
#include <IOKit/IOMapper.h>

// General constants about all VART/DART style Address Re-Mapping Tables
#define kMapperPage	    (4 * 1024)
#define kTransPerPage	    (kMapperPage / sizeof(ppnum_t))

#define kMinZoneSize	    4		// Minimum Zone size in pages
#define kMaxNumZones	    (31 - 14)	// 31 bit mapped in 16K super pages

class IOCopyMapper : public IOMapper
{
    OSDeclareDefaultStructors(IOCopyMapper);

// alias the fTable variable into our mappings table
#define fMappings	((ActiveDARTEntry *) super::fTable)

private:

    UInt32		fFreeLists[kMaxNumZones];

    IOLock		*fTableLock;

    void		*fDummyPage;

    UInt32		 fNumZones;
    UInt32		 fMapperRegionSize;
    UInt32		 fMapperRegionUsed;
    UInt32		 fMapperRegionMaxUsed;
    UInt32		 fFreeSleepers;
    ppnum_t		 fDummyPageNumber;
    ppnum_t		 fBufferPage;

    // Internal functions

    void breakUp(unsigned start, unsigned end, unsigned freeInd);
    void invalidateDART(ppnum_t pnum, IOItemCount size);
    void tlbInvalidate(ppnum_t pnum, IOItemCount size);

    virtual void free();

    virtual bool initHardware(IOService * provider);
public:
    virtual ppnum_t iovmAlloc(IOItemCount pages);
    virtual void iovmFree(ppnum_t addr, IOItemCount pages);

    virtual void iovmInsert(ppnum_t addr, IOItemCount offset, ppnum_t page);
    virtual void iovmInsert(ppnum_t addr, IOItemCount offset,
                            ppnum_t *pageList, IOItemCount pageCount);
    virtual void iovmInsert(ppnum_t addr, IOItemCount offset,
                            upl_page_info_t *pageList, IOItemCount pageCount);

    virtual addr64_t mapAddr(IOPhysicalAddress addr);
};

extern IOCopyMapper * gIOCopyMapper;