--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/baseport/syborg/soundsc/virtio_defs.h	Thu Mar 04 00:55:21 2010 +0000
@@ -0,0 +1,117 @@
+/*
+* This component and the accompanying materials are made available
+* under the terms of the License "Eclipse Public License v1.0"
+* which accompanies this distribution, and is available
+* at the URL "http://www.eclipse.org/legal/epl-v10.html".
+*
+* Initial Contributors:
+* Accenture Ltd
+*
+* Contributors:
+*
+* Description: This file is a part of sound driver for Syborg adaptation.
+*
+*/
+
+#ifndef VIRTIO_DEFS_H
+#define VIRTIO_DEFS_H
+
+#include <e32def.h>
+#include <kernel.h> // fot TPhysAddr
+
+/// @file virtio_defs.h
+/// most of definitions here come from VirtIo spec
+/// and was made compatible to the qemu backend (which means diverged from spec)
+
+namespace VirtIo
+{
+
+#define POW2ALIGN1(x) ((x)|((x)>>1))
+#define POW2ALIGN2(x) ((x)|((x)>>2))
+#define POW2ALIGN4(x) ((x)|((x)>>4))
+#define POW2ALIGN8(x) ((x)|((x)>>8))
+#define POW2ALIGN16(x) ((x)|((x)>>16))
+
+///@brief Alignes \a x to the closest bigger or equal power2 value
+#define POW2ALIGN(x) (POW2ALIGN16(POW2ALIGN8(POW2ALIGN4(POW2ALIGN2(POW2ALIGN1((x)-1)))))+1)
+
+static const TUint KVirtIoAlignment = 0x1000;
+
+enum 
+	{
+	EStatusReset = 0,
+	EStatusAcknowledge = 1,
+	EStatusDriverFound = 2,
+	EStatusDriverInitialised = 4,
+	EStatusFailed = 0x80
+	};
+
+enum 
+	{
+    EIoID             = 0,
+    EIoDevType        = 1,
+    EIoHostFeatures  = 2,
+    EIoGuestFeatures = 3,
+    EIoQueueBase     = 4,
+    EIoQueueSize      = 5,
+    EIoQueueSelect      = 6,
+    EIoQueueNotify   = 7,
+    EIoStatus	  	  = 8,
+    EIoInterruptEnable     = 9,
+    EIoInterruptStatus     = 10
+	};
+
+struct TRingDesc
+	{
+	enum 
+		{
+		EFlagNext = 1,
+		EFlagWrite = 2
+		};
+
+	TUint64 iAddr;	// physical address
+	TUint32 iLen;
+	TUint16 iFlags;
+	TUint16 iNext;
+	};
+
+struct TRingAvail
+	{
+	enum { EFlagInhibitNotifications = 1 };
+	TUint16 iFlags;
+	TUint16 iIdx;
+	TUint16 iRing[1];
+	};
+
+struct TRingUsed
+	{
+	enum { EFlagInhibitNotifications = 1 };
+	TUint16 iFlags;
+	TUint16 iIdx;
+		struct 
+		{
+		TUint32 iId;
+		TUint32 iLen;
+		} iRing[1];
+	};
+
+/// @brief Represents element of scatter gather list
+struct TAddrLen
+	{
+	TPhysAddr iAddr;
+	TUint32 iLen;
+	};
+
+/// Gives a pointer resulting with aliging \a v with \a a.
+/// @note \a a must be power of 2.
+template <typename T> T* Align( T* v, TUint a )
+	{ return (T*)( ((TUint8*)v) + ((-(TUint)v)&(a-1)) ); }
+	
+/// Gives a pointer resulting with aliging \a v with \a a.
+/// @note \a a must be power of 2.
+template <typename T> T Align( T v, TUint a )
+	{ return (v)+((-v)&(a-1)); }
+
+}
+
+#endif