IOFWUserPhysicalAddressSpace.cpp   [plain text]

/*
 * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
 * 
 * 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.
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 */
/*
 *  IOFireWirePhysicalAddressSpace.cpp
 *  IOFireWireFamily
 *
 *  Created by NWG on Fri Dec 08 2000.
 *  Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 */

#import "IOFWUserPhysicalAddressSpace.h"

#import <IOKit/IOLib.h>

OSDefineMetaClassAndStructors(IOFWUserClientPhysicalAddressSpace, IOFWPhysicalAddressSpace) ;

bool
IOFWUserClientPhysicalAddressSpace::initWithDesc(
	IOFireWireBus*		bus,
	IOMemoryDescriptor*	mem)
{
	if (!IOFWPhysicalAddressSpace::initWithDesc(bus, mem))
		return false ;
	
	if ( kIOReturnSuccess != mem->prepare() )
	{
		fMemPrepared = false ;
		return false ;
	}
	
	fMemPrepared = true ;
	mSegmentCount = 0 ;

	{ //scope
		UInt32 			currentOffset = 0 ;
		IOByteCount 	length ;
			
		while (0 != fMem->getPhysicalSegment(currentOffset, & length))
		{
			currentOffset += length ;
			++mSegmentCount ;
		}
	}
	
	return true ;
}

void
IOFWUserClientPhysicalAddressSpace::free()
{
	IOFWPhysicalAddressSpace::free() ;

	if (fMemPrepared)
		fMem->complete() ;
}

UInt32
IOFWUserClientPhysicalAddressSpace::getSegmentCount()
{
	return mSegmentCount ;
}

IOReturn
IOFWUserClientPhysicalAddressSpace::getSegments(
	UInt32*				ioSegmentCount,
	IOPhysicalAddress	outPages[],
	IOByteCount			outLength[])
{
	UInt32 segmentCount = min(*ioSegmentCount, mSegmentCount) ;
	IOReturn	result = kIOReturnSuccess ;

	IOByteCount currentOffset = 0 ;
	for(UInt32 segment=0; segment < segmentCount; ++segment)
	{
		outPages[segment] = fMem->getPhysicalSegment(currentOffset, & outLength[segment]) ;
		currentOffset+= outLength[segment] ;
	}
	
	return result ;
}