--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/kerneltest/e32test/mmu/t_wbc.cpp	Mon Oct 19 15:55:17 2009 +0100
@@ -0,0 +1,108 @@
+// Copyright (c) 1995-2009 Nokia Corporation and/or its subsidiary(-ies).
+// All rights reserved.
+// 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:
+// Nokia Corporation - initial contribution.
+//
+// Contributors:
+//
+// Description:
+// e32test\mmu\t_wbc.cpp
+// Overview:
+// Read and write RChunk data.
+// API Information:
+// RChunk
+// Details:
+// Create two local RChunk objects. Perform ReadModifyWrite, WriteOnly 
+// and ReadOnly operations on the chunks. Verify that the results are
+// as expected.
+// Platforms/Drives/Compatibility:
+// All.
+// Assumptions/Requirement/Pre-requisites:
+// Failures and causes:
+// Base Port information:
+// 
+//
+
+#include <e32test.h>
+#include <e32hal.h>
+#include <e32svr.h>
+
+RTest test(_L("T_WBC"));
+
+TUint32 ReadModifyWrite(volatile TUint32* p, TInt aNumWords)
+	{
+	TUint32 x=0;
+	while(aNumWords--)
+		{
+		x=*p;
+		*p++=0;
+		}
+	return x;
+	}
+
+void WriteOnly(volatile TUint32* p, TInt aNumWords)
+	{
+	while(aNumWords--)
+		*p++=0xffffffff;
+	}
+
+TUint32 ReadOnly(volatile TUint32* p, TInt aNumWords)
+	{
+	TUint32 x=0;
+	while(aNumWords--)
+		x+=*p++;
+	return x;
+	}
+
+void Dump(volatile TUint32* p, TInt aNumWords)
+	{
+	while(aNumWords>0)
+		{
+		RDebug::Print(_L("%08x: %08x %08x %08x %08x %08x %08x %08x %08x"),p,
+			p[0],p[1],p[2],p[3],p[4],p[5],p[6],p[7]);
+		p+=8;
+		aNumWords-=8;
+		}
+	}
+
+void Verify(volatile TUint32* p, TInt aNumWords)
+	{
+	while(aNumWords--)
+		test(*p++==0xffffffff);
+	}
+
+GLDEF_C TInt E32Main()
+	{
+	
+	TInt pageSize;
+	UserHal::PageSizeInBytes(pageSize);
+	test.Title();
+	test.Start(_L("Create chunk 1"));
+	RChunk c1;
+	TInt r=c1.CreateLocal(4*pageSize,0x100000);	// initial size 4 pages
+	test(r==KErrNone);
+	test.Next(_L("Create chunk 2"));
+	RChunk c2;
+	r=c2.CreateLocal(pageSize,0x100000);		// initial size 1 page
+	test(r==KErrNone);
+	test.Next(_L("Fill DCache with modified lines from chunk 1"));
+	volatile TUint32* p=(volatile TUint32*)(c1.Base()+2*pageSize);
+	ReadModifyWrite(p,pageSize>>1);
+	c1.Adjust(2*pageSize);		// lose the two modified pages
+	c2.Adjust(3*pageSize);		// map them back into chunk 2
+	p=(volatile TUint32*)(c2.Base()+pageSize);
+	WriteOnly(p,pageSize>>1);	// write to the modified pages at new virtual address
+	p=(volatile TUint32*)c1.Base();
+	ReadOnly(p,pageSize>>1);	// read two other pages (this will evict the modified lines)
+	p=(volatile TUint32*)(c2.Base()+pageSize);
+	Dump(p,pageSize>>1);
+	Verify(p,pageSize>>1);
+	test.Printf(_L("\n"));
+	test.End();
+	return 0;
+	}