/*+
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* This component and the accompanying materials are made available+
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* under the terms of the License "Eclipse Public License v1.0"+
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* which accompanies this distribution, and is available+
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".+
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*+
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* Initial Contributors:+
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* Accenture Ltd+
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*+
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* Contributors:+
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*+
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* Description: This file is a part of sound driver for Syborg adaptation.+
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*+
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*/+
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+
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#include "virtio.h"+
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+
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namespace VirtIo +
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{+
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+
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#define MIN(x,y) (((x)<=(y))?(x):(y))+
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#define INVALID_PHYSADDR(x) ((x)==TPhysAddr(-1))+
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+
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TInt LinearToSGL( TAny* aVirtual, TUint aSize, TAddrLen aSGL[], TUint& aSGLCount )+
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	{+
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	const TUint pageSize = Kern::RoundToPageSize(1);+
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	TUint8* virtAddr = reinterpret_cast<TUint8*>( aVirtual );+
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	TPhysAddr physAddr = Epoc::LinearToPhysical( TLinAddr(virtAddr) );+
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	if (INVALID_PHYSADDR(physAddr))+
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		{ return KErrArgument; }+
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	TUint sglLimit = aSGLCount;+
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	aSGLCount = 0;+
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	TUint left = aSize;+
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	while (left)+
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		{+
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		TPhysAddr startPhysAddr = physAddr;+
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		TUint8* startVirtAddr = virtAddr;+
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		while ( (left) +
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			&& ( Epoc::LinearToPhysical( TLinAddr(virtAddr) ) == physAddr ) )+
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			{+
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			TUint size = MIN(left, pageSize);+
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			physAddr += size;+
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			virtAddr += size;+
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			left -= size;+
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			}+
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		if (INVALID_PHYSADDR(physAddr))+
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			{ return KErrArgument; }+
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		if ((aSGL) && (aSGLCount<sglLimit))+
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			{+
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			aSGL[aSGLCount].iAddr = (TUint32) startPhysAddr;+
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			aSGL[aSGLCount].iLen = virtAddr - startVirtAddr;+
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			}+
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		aSGLCount++;+
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		}+
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	return (aSGLCount<=sglLimit)?KErrNone:KErrNoMemory;+
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	}+
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	+
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} // namespace VirtIo	+
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