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os/kernelhwsrv/kernel/eka/memmodel/epoc/flexible/mchunk.cpp
author sl
Tue, 10 Jun 2014 14:32:02 +0200
changeset 1 260cb5ec6c19
permissions -rw-r--r--
Update contrib. 
     1 // Copyright (c) 1994-2009 Nokia Corporation and/or its subsidiary(-ies).

     2 // All rights reserved.

     3 // This component and the accompanying materials are made available

     4 // under the terms of the License "Eclipse Public License v1.0"

     5 // which accompanies this distribution, and is available

     6 // at the URL "http://www.eclipse.org/legal/epl-v10.html".

     7 //

     8 // Initial Contributors:

     9 // Nokia Corporation - initial contribution.

    10 //

    11 // Contributors:

    12 //

    13 // Description:

    14 //

    15 

    16 #include <memmodel.h>

    17 #include "mmu/mm.h"

    18 #include "mmboot.h"

    19 

    20 

    21 DMemModelChunk::DMemModelChunk()

    22 	{

    23 	}

    24 

    25 

    26 DMemModelChunk::~DMemModelChunk()

    27 	{

    28 	__KTRACE_OPT(KTHREAD,Kern::Printf("DMemModelChunk destruct %O",this));

    29 

    30 	MM::MappingDestroy(iKernelMapping);

    31 	MM::MemoryDestroy(iMemoryObject);

    32 

    33 	delete iPageBitMap;

    34 	delete iPermanentPageBitMap;

    35 

    36 	TDfc* dfc = iDestroyedDfc;

    37 	if(dfc)

    38 		dfc->QueueOnIdle();

    39 

    40 	__KTRACE_OPT(KMEMTRACE, Kern::Printf("MT:D %d %x %O",NTickCount(),this,this));

    41 #ifdef BTRACE_CHUNKS

    42 	BTraceContext4(BTrace::EChunks,BTrace::EChunkDestroyed,this);

    43 #endif

    44 	}

    45 

    46 

    47 TInt DMemModelChunk::Close(TAny* aPtr)

    48 	{

    49 	if (aPtr)

    50 		{

    51 		DMemModelProcess* pP=(DMemModelProcess*)aPtr;

    52 		__NK_ASSERT_DEBUG(!iOwningProcess || iOwningProcess==pP);

    53 		pP->RemoveChunk(this);

    54 		}	

    55 	TInt r=Dec();

    56 	__KTRACE_OPT(KMMU,Kern::Printf("DMemModelChunk::Close %d %O",r,this));

    57 	__NK_ASSERT_DEBUG(r > 0); // Should never be negative.

    58 	if (r==1)

    59 		{

    60 		K::ObjDelete(this);

    61 		return EObjectDeleted;

    62 		}

    63 	return 0;

    64 	}

    65 

    66 

    67 void DMemModelChunk::SetPaging(TUint aCreateAtt)

    68 	{

    69 	// Only user data chunks should be able to be data paged, i.e. only those 

    70 	// that can be created via the RChunk create methods.

    71 	if ((iChunkType != EUserData && iChunkType != EUserSelfModCode) ||

    72 		!(K::MemModelAttributes & EMemModelAttrDataPaging))	// Data paging device installed?

    73 		{

    74 		return;

    75 		}

    76 	// Pageable chunks must own their memory.

    77 	__NK_ASSERT_DEBUG(!(iAttributes & EMemoryNotOwned));

    78 

    79 	// Set the data paging attributes

    80 	TUint dataPolicy = TheSuperPage().KernelConfigFlags() & EKernelConfigDataPagingPolicyMask;

    81 	if (dataPolicy == EKernelConfigDataPagingPolicyNoPaging)

    82 		{

    83 		return;

    84 		}

    85 	if (dataPolicy == EKernelConfigDataPagingPolicyAlwaysPage)

    86 		{

    87 		iAttributes |= EDataPaged;

    88 		return;

    89 		}

    90 	TUint pagingAtt = aCreateAtt & TChunkCreate::EPagingMask;

    91 	if (pagingAtt == TChunkCreate::EPaged)

    92 		{

    93 		iAttributes |= EDataPaged;

    94 		return;

    95 		}

    96 	if (pagingAtt == TChunkCreate::EUnpaged)

    97 		{

    98 		return;

    99 		}

   100 	// No data paging attribute specified for this chunk so use the process's

   101 	__NK_ASSERT_DEBUG(pagingAtt == TChunkCreate::EPagingUnspec);

   102 	DProcess* currentProcess = TheCurrentThread->iOwningProcess;

   103 	if (currentProcess->iAttributes & DProcess::EDataPaged)

   104 		{

   105 		iAttributes |= EDataPaged;

   106 		}

   107 	}

   108 

   109 

   110 TInt DMemModelChunk::DoCreate(SChunkCreateInfo& aInfo)

   111 	{

   112 	__ASSERT_COMPILE(!(EMMChunkAttributesMask & EChunkAttributesMask));

   113 	__KTRACE_OPT(KMMU,Kern::Printf("Chunk %O DoCreate att=%08x",this,iAttributes));

   114 	if (aInfo.iMaxSize<=0)

   115 		return KErrArgument;

   116 

   117 	iMaxSize = MM::RoundToPageSize(aInfo.iMaxSize);

   118 

   119 	TInt maxpages=iMaxSize>>KPageShift;

   120 	if (iAttributes & EDisconnected)

   121 		{

   122 		TBitMapAllocator* pM=TBitMapAllocator::New(maxpages,ETrue);

   123 		if (!pM)

   124 			return KErrNoMemory;

   125 		iPageBitMap=pM;

   126 		__KTRACE_OPT(KMMU,Kern::Printf("PageBitMap at %08x, MaxPages %d",pM,maxpages));

   127 		}

   128 	if(iChunkType==ESharedKernelSingle || iChunkType==ESharedKernelMultiple)

   129 		{

   130 		TBitMapAllocator* pM=TBitMapAllocator::New(maxpages,ETrue);

   131 		if (!pM)

   132 			return KErrNoMemory;

   133 		iPermanentPageBitMap = pM;

   134 		}

   135 

   136 	TMemoryAttributes attr = EMemoryAttributeStandard;

   137 	TBool mapInKernel = false;

   138 	TBool nowipe = false;

   139 	TBool executable = false;

   140 	TBool movable = false;

   141 	TInt r;

   142 

   143 	switch(iChunkType)

   144 		{

   145 	case EUserSelfModCode:

   146 		executable = true;

   147 		movable = true;

   148 		break;

   149 

   150 	case EUserData:

   151 	case ERamDrive:

   152 		movable = true;

   153 		break;

   154 

   155 	case EKernelMessage:

   156 	case ESharedKernelSingle:

   157 	case ESharedKernelMultiple:

   158 	case ESharedIo:

   159 		mapInKernel = true;

   160 		r = MM::MemoryAttributes(attr,*(TMappingAttributes2*)&aInfo.iMapAttr);

   161 		if(r!=KErrNone)

   162 			return r;

   163 		break;

   164 

   165 	case EKernelData:

   166 		nowipe = true;

   167 		break;

   168 

   169 	case EDllData:

   170 		__NK_ASSERT_DEBUG(0); // invalid chunk type

   171 	case EKernelStack:

   172 		__NK_ASSERT_DEBUG(0); // invalid chunk type

   173 	case EDll: // global code

   174 		__NK_ASSERT_DEBUG(0); // invalid chunk type

   175 	case EKernelCode:

   176 		__NK_ASSERT_DEBUG(0); // invalid chunk type

   177 	case EUserCode: // local code

   178 		__NK_ASSERT_DEBUG(0); // invalid chunk type

   179 	case ESharedKernelMirror:

   180 		__NK_ASSERT_DEBUG(0); // invalid chunk type

   181 	default:

   182 		__NK_ASSERT_DEBUG(0); // invalid chunk type

   183 		return KErrArgument;

   184 		}

   185 

   186 	// calculate memory type...

   187 	TMemoryObjectType memoryType = EMemoryObjectUnpaged;

   188 	if (iAttributes & EMemoryNotOwned)

   189 		{

   190 		if (memoryType != EMemoryObjectUnpaged)

   191 			return KErrArgument;

   192 		memoryType = EMemoryObjectHardware;

   193 		}

   194 	if (iAttributes & EDataPaged)

   195 		{

   196 		if (memoryType != EMemoryObjectUnpaged)

   197 			return KErrArgument;

   198 		memoryType = EMemoryObjectPaged;

   199 		}

   200 	if (iAttributes & ECache)

   201 		{

   202 		if (memoryType != EMemoryObjectUnpaged)

   203 			return KErrArgument;

   204 		memoryType = EMemoryObjectDiscardable;

   205 		}

   206 	if (memoryType == EMemoryObjectUnpaged)

   207 		{

   208 		if (movable)

   209 			memoryType = EMemoryObjectMovable;

   210 		}

   211 

   212 	// calculate memory flags...

   213 	TMemoryCreateFlags flags = nowipe ? EMemoryCreateNoWipe : EMemoryCreateDefault;

   214 	flags = (TMemoryCreateFlags)(flags|EMemoryCreateUseCustomWipeByte|(iClearByte<<EMemoryCreateWipeByteShift));

   215 	if(executable)

   216 		flags = (TMemoryCreateFlags)(flags|EMemoryCreateAllowExecution);

   217 

   218 	r = MM::MemoryNew(iMemoryObject,memoryType,MM::BytesToPages(iMaxSize),flags,attr);

   219 	if(r!=KErrNone)

   220 		return r;

   221 

   222 	if(mapInKernel)

   223 		{

   224 		TInt r = MM::MappingNew(iKernelMapping, iMemoryObject, ESupervisorReadWrite, KKernelOsAsid);

   225 		if(r!=KErrNone)

   226 			return r; // Note, iMemoryObject will get cleaned-up when chunk is destroyed

   227 		const TMappingAttributes2& lma = MM::LegacyMappingAttributes(attr,EUserReadWrite);

   228 		*(TMappingAttributes2*)&iMapAttr = lma;

   229 		}

   230 

   231 #ifdef BTRACE_CHUNKS

   232 	TKName nameBuf;

   233 	Name(nameBuf);

   234 	BTraceContextN(BTrace::EChunks,BTrace::EChunkCreated,this,iMaxSize,nameBuf.Ptr(),nameBuf.Size());

   235 	if(iOwningProcess)

   236 		BTrace8(BTrace::EChunks,BTrace::EChunkOwner,this,iOwningProcess);

   237 	BTraceContext12(BTrace::EChunks,BTrace::EChunkInfo,this,iChunkType,iAttributes);

   238 #endif

   239 #ifdef BTRACE_FLEXIBLE_MEM_MODEL

   240 	BTrace8(BTrace::EFlexibleMemModel,BTrace::EMemoryObjectIsChunk,iMemoryObject,this);

   241 #endif

   242 	return KErrNone;

   243 	}

   244 

   245 

   246 void DMemModelChunk::SetFixedAddress(TLinAddr aAddr, TInt aInitialSize)

   247 	{

   248 	__KTRACE_OPT(KMMU,Kern::Printf("DMemModelChunk %O SetFixedAddress %08x size %08x",this,aAddr,aInitialSize));

   249 	iFixedBase = aAddr;

   250 	iSize = MM::RoundToPageSize(aInitialSize);

   251 	if(iSize)

   252 		MM::MemoryClaimInitialPages(iMemoryObject,iFixedBase,iSize,ESupervisorReadWrite);

   253 	}

   254 

   255 

   256 TInt DMemModelChunk::SetAttributes(SChunkCreateInfo& aInfo)

   257 	{

   258 	switch(iChunkType)

   259 		{

   260 		case EKernelData:

   261 		case EKernelMessage:

   262 			iAttributes = EPrivate;

   263 			break;

   264 		case ERamDrive:

   265 			iAttributes = EPrivate;

   266 			break;

   267 		case EUserData:

   268 			if (aInfo.iGlobal)

   269 				iAttributes = EPublic;

   270 			else

   271 				iAttributes = EPrivate;

   272 			break;

   273 		case EUserSelfModCode:

   274 			if (aInfo.iGlobal)

   275 				iAttributes = EPublic|ECode;

   276 			else

   277 				iAttributes = EPrivate|ECode;

   278 			break;

   279 		case ESharedKernelSingle:

   280 		case ESharedKernelMultiple:

   281 		case ESharedIo:

   282 			iAttributes = EPublic;

   283 			break;

   284 		case EDllData:

   285 			__NK_ASSERT_DEBUG(0); // invalid chunk type

   286 		case EKernelStack:

   287 			__NK_ASSERT_DEBUG(0); // invalid chunk type

   288 		case EDll: // global code

   289 			__NK_ASSERT_DEBUG(0); // invalid chunk type

   290 		case EKernelCode:

   291 			__NK_ASSERT_DEBUG(0); // invalid chunk type

   292 		case EUserCode: // local code

   293 			__NK_ASSERT_DEBUG(0); // invalid chunk type

   294 		case ESharedKernelMirror:

   295 			__NK_ASSERT_DEBUG(0); // invalid chunk type

   296 		default:

   297 			FAULT();

   298 		}

   299 	return KErrNone;

   300 	}

   301 

   302 

   303 TInt DMemModelChunk::Adjust(TInt aNewSize)

   304 	{

   305 	__KTRACE_OPT(KMMU,Kern::Printf("DMemModelChunk::Adjust %08x",aNewSize));

   306 	if (iAttributes & (EDoubleEnded|EDisconnected))

   307 		return KErrGeneral;

   308 	if (aNewSize<0 || aNewSize>iMaxSize)

   309 		return KErrArgument;

   310 

   311 	TInt r=KErrNone;

   312 	TInt newSize=MM::RoundToPageSize(aNewSize);

   313 	if (newSize!=iSize)

   314 		{

   315 		MM::MemoryLock(iMemoryObject);

   316 		if (newSize>iSize)

   317 			{

   318 			__KTRACE_OPT(KMMU,Kern::Printf("DMemModelChunk::Adjust growing"));

   319 			r=DoCommit(iSize,newSize-iSize);

   320 			}

   321 		else if (newSize<iSize)

   322 			{

   323 			__KTRACE_OPT(KMMU,Kern::Printf("DMemModelChunk::Adjust shrinking"));

   324 			DoDecommit(newSize,iSize-newSize);

   325 			}

   326 		MM::MemoryUnlock(iMemoryObject);

   327 		}

   328 	__COND_DEBUG_EVENT(r==KErrNone, EEventUpdateChunk, this);

   329 	__KTRACE_OPT(KMMU,Kern::Printf("DMemModelChunk %O adjusted to %x",this,iSize));

   330 	return r;

   331 	}

   332 

   333 

   334 TInt DMemModelChunk::Address(TInt aOffset, TInt aSize, TLinAddr& aKernelAddress)

   335 	{

   336 	if(!iPermanentPageBitMap)

   337 		return KErrAccessDenied;

   338 	if(TUint(aOffset)>=TUint(iMaxSize))

   339 		return KErrArgument;

   340 	if(TUint(aOffset+aSize)>TUint(iMaxSize))

   341 		return KErrArgument;

   342 	if(aSize<=0)

   343 		return KErrArgument;

   344 	TInt start = aOffset>>KPageShift;

   345 	TInt size = ((aOffset+aSize-1)>>KPageShift)-start+1;

   346 	if(iPermanentPageBitMap->NotAllocated(start,size))

   347 		return KErrNotFound;

   348 	aKernelAddress = MM::MappingBase(iKernelMapping)+aOffset;

   349 	return KErrNone;

   350 	}

   351 

   352 

   353 TInt DMemModelChunk::PhysicalAddress(TInt aOffset, TInt aSize, TLinAddr& aKernelAddress, TUint32& aPhysicalAddress, TUint32* aPhysicalPageList)

   354 	{

   355 	if(aSize<=0)

   356 		return KErrArgument;

   357 	TInt r = Address(aOffset,aSize,aKernelAddress);

   358 	if(r!=KErrNone)

   359 		return r;

   360 	TInt index = aOffset>>KPageShift;

   361 	TInt count = ((aOffset+aSize-1)>>KPageShift)-index+1;

   362 	r = MM::MemoryPhysAddr(iMemoryObject,index,count,aPhysicalAddress,aPhysicalPageList);

   363 	if(r==KErrNone)

   364 		aPhysicalAddress += aOffset&KPageMask;

   365 	return r;

   366 	}

   367 

   368 

   369 TInt DMemModelChunk::DoCommit(TInt aOffset, TInt aSize, TCommitType aCommitType, TUint32* aExtraArg)

   370 	{

   371 	__KTRACE_OPT(KMMU,Kern::Printf("DMemModelChunk::DoCommit %x+%x type=%d extra=%08x",aOffset,aSize,aCommitType,aExtraArg));

   372 

   373 	__NK_ASSERT_DEBUG(((aOffset|aSize)&KPageMask)==0);

   374 

   375 	TInt r = KErrArgument;

   376 	switch(aCommitType)

   377 		{

   378 	case DChunk::ECommitDiscontiguous:

   379 		r = MM::MemoryAlloc(iMemoryObject, MM::BytesToPages(aOffset), MM::BytesToPages(aSize));

   380 		break;

   381 

   382 	case DChunk::ECommitDiscontiguousPhysical:

   383 		r = MM::MemoryAddPages(iMemoryObject, MM::BytesToPages(aOffset), MM::BytesToPages(aSize), (TPhysAddr*)aExtraArg);

   384 		break;

   385 

   386 	case DChunk::ECommitContiguous:

   387 		r = MM::MemoryAllocContiguous(iMemoryObject, MM::BytesToPages(aOffset), MM::BytesToPages(aSize), 0, *(TPhysAddr*)aExtraArg);

   388 		break;

   389 

   390 	case DChunk::ECommitContiguousPhysical:

   391 		r = MM::MemoryAddContiguous(iMemoryObject, MM::BytesToPages(aOffset), MM::BytesToPages(aSize), (TPhysAddr)aExtraArg);

   392 		break;

   393 

   394 	case DChunk::ECommitVirtual:

   395 	default:

   396 		__NK_ASSERT_DEBUG(0); // Invalid commit type

   397 		r = KErrNotSupported;

   398 		break;

   399 		}

   400 

   401 	if(r==KErrNone)

   402 		{

   403 		iSize += aSize;

   404 		if(iPermanentPageBitMap)

   405 			iPermanentPageBitMap->Alloc(aOffset>>KPageShift,aSize>>KPageShift);

   406 #ifdef BTRACE_CHUNKS

   407 		TInt subcategory = (aCommitType & DChunk::ECommitPhysicalMask) ? BTrace::EChunkMemoryAdded : BTrace::EChunkMemoryAllocated;

   408 		BTraceContext12(BTrace::EChunks,subcategory,this,aOffset,aSize);

   409 #endif

   410 		}

   411 

   412 	return r;

   413 	}

   414 

   415 

   416 void DMemModelChunk::DoDecommit(TInt aOffset, TInt aSize)

   417 	{

   418 	__KTRACE_OPT(KMMU,Kern::Printf("DMemModelChunk::DoDecommit %x+%x",aOffset,aSize));

   419 

   420 	__NK_ASSERT_DEBUG(((aOffset|aSize)&KPageMask)==0);

   421 

   422 	TUint index = MM::BytesToPages(aOffset);

   423 	TUint count = MM::BytesToPages(aSize);

   424 	iSize -= count*KPageSize;

   425 	if(iAttributes&EMemoryNotOwned)

   426 		MM::MemoryRemovePages(iMemoryObject, index, count, 0);

   427 	else

   428 		MM::MemoryFree(iMemoryObject, index, count);

   429 

   430 #ifdef BTRACE_CHUNKS

   431 	if (count != 0)

   432 		{

   433 		TInt subcategory = (iAttributes & EMemoryNotOwned) ? BTrace::EChunkMemoryRemoved : BTrace::EChunkMemoryDeallocated;

   434 		BTraceContext12(BTrace::EChunks,subcategory,this,aOffset,count*KPageSize);

   435 		}

   436 #endif

   437 	}

   438 

   439 

   440 TInt DMemModelChunk::AdjustDoubleEnded(TInt aBottom, TInt aTop)

   441 	{

   442 	__KTRACE_OPT(KMMU,Kern::Printf("DMemModelChunk::AdjustDoubleEnded %x-%x",aBottom,aTop));

   443 	if ((iAttributes & (EDoubleEnded|EDisconnected))!=EDoubleEnded)

   444 		return KErrGeneral;

   445 	if (aTop<0 || aBottom<0 || aTop<aBottom || aTop>iMaxSize)

   446 		return KErrArgument;

   447 

   448 	aBottom &= ~KPageMask;

   449 	aTop = MM::RoundToPageSize(aTop);

   450 	TInt newSize=aTop-aBottom;

   451 	if (newSize>iMaxSize)

   452 		return KErrArgument;

   453 

   454 	MM::MemoryLock(iMemoryObject);

   455 	TInt initBottom=iStartPos;

   456 	TInt initTop=iStartPos+iSize;

   457 	TInt nBottom=Max(aBottom,iStartPos);	// intersection bottom

   458 	TInt nTop=Min(aTop,iStartPos+iSize);	// intersection top

   459 	TInt r=KErrNone;

   460 	if (nBottom<nTop)

   461 		{

   462 		__KTRACE_OPT(KMMU,Kern::Printf("Initial and final regions intersect"));

   463 		if (initBottom<nBottom)

   464 			{

   465 			iStartPos=aBottom;

   466 			DoDecommit(initBottom,nBottom-initBottom);

   467 			}

   468 		if (initTop>nTop)

   469 			DoDecommit(nTop,initTop-nTop);	// this changes iSize

   470 		if (aBottom<nBottom)

   471 			{

   472 			r=DoCommit(aBottom,nBottom-aBottom);

   473 			if (r==KErrNone)

   474 				{

   475 				if (aTop>nTop)

   476 					r=DoCommit(nTop,aTop-nTop);

   477 				if (r==KErrNone)

   478 					iStartPos=aBottom;

   479 				else

   480 					DoDecommit(aBottom,nBottom-aBottom);

   481 				}

   482 			}

   483 		else if (aTop>nTop)

   484 			r=DoCommit(nTop,aTop-nTop);

   485 		}

   486 	else

   487 		{

   488 		__KTRACE_OPT(KMMU,Kern::Printf("Initial and final regions disjoint"));

   489 		if (iSize)

   490 			DoDecommit(initBottom,iSize);

   491 		iStartPos=aBottom;

   492 		if (newSize)

   493 			r=DoCommit(iStartPos,newSize);

   494 		}

   495 	MM::MemoryUnlock(iMemoryObject);

   496 	__COND_DEBUG_EVENT(r==KErrNone, EEventUpdateChunk, this);

   497 	__KTRACE_OPT(KMMU,Kern::Printf("DMemModelChunk %O adjusted to %x+%x",this,iStartPos,iSize));

   498 	return r;

   499 	}

   500 

   501 

   502 TInt DMemModelChunk::CheckRegion(TInt& aOffset, TInt& aSize)

   503 	{

   504 	if((iAttributes & (EDoubleEnded|EDisconnected))!=EDisconnected)

   505 		return KErrGeneral;

   506 	if(aOffset<0 || aSize<0)

   507 		return KErrArgument;

   508 	if(aSize==0)

   509 		return KErrNone;

   510 

   511 	TUint end = MM::RoundToPageSize(aOffset+aSize);

   512 	if(end>TUint(iMaxSize))

   513 		return KErrArgument;

   514 	aOffset &= ~KPageMask;

   515 	aSize = end-aOffset;

   516 	if(end<=TUint(aOffset))

   517 		return KErrArgument;

   518 

   519 	return 1;

   520 	}

   521 

   522 

   523 TInt DMemModelChunk::Commit(TInt aOffset, TInt aSize, TCommitType aCommitType, TUint32* aExtraArg)

   524 	{

   525 	__KTRACE_OPT(KMMU,Kern::Printf("DMemModelChunk::Commit %x+%x type=%d extra=%08x",aOffset,aSize,aCommitType,aExtraArg));

   526 

   527 	TInt r = CheckRegion(aOffset,aSize);

   528 	if(r<=0)

   529 		return r;

   530 

   531 	MM::MemoryLock(iMemoryObject);

   532 	TInt i=aOffset>>KPageShift;

   533 	TInt n=aSize>>KPageShift;

   534 	if (iPageBitMap->NotFree(i,n))

   535 		r=KErrAlreadyExists;

   536 	else

   537 		{

   538 		r=DoCommit(aOffset,aSize,aCommitType,aExtraArg);

   539 		if (r==KErrNone)

   540 			iPageBitMap->Alloc(i,n);

   541 		}

   542 	MM::MemoryUnlock(iMemoryObject);

   543 	__COND_DEBUG_EVENT(r==KErrNone, EEventUpdateChunk, this);

   544 	return r;

   545 	}

   546 

   547 

   548 TInt DMemModelChunk::Allocate(TInt aSize, TInt aGuard, TInt aAlign)

   549 	{

   550 	__KTRACE_OPT(KMMU,Kern::Printf("DMemModelChunk::Allocate %x %x %d",aSize,aGuard,aAlign));

   551 

   552 	// the flexible memory model doesn't implement aGuard and aAlign...

   553 	__NK_ASSERT_DEBUG(aGuard==0);

   554 	(void)aGuard;

   555 	__NK_ASSERT_DEBUG(aAlign==0);

   556 	(void)aAlign;

   557 

   558 	TInt dummyOffset = 0;

   559 	TInt r = CheckRegion(dummyOffset,aSize);

   560 	if(r<=0)

   561 		return r;

   562 

   563 	MM::MemoryLock(iMemoryObject);

   564 	TInt n=aSize>>KPageShift;

   565 	TInt i=iPageBitMap->AllocConsecutive(n, EFalse);		// allocate the offset

   566 	if (i<0)

   567 		r=KErrNoMemory;		// run out of reserved space for this chunk

   568 	else

   569 		{

   570 		TInt offset=i<<KPageShift;

   571 		__KTRACE_OPT(KMMU,Kern::Printf("Offset %x allocated",offset));

   572 		r=DoCommit(offset,aSize);

   573 		if (r==KErrNone)

   574 			{

   575 			iPageBitMap->Alloc(i,n);

   576 			r=offset;		// if operation successful, return allocated offset

   577 			}

   578 		}

   579 	MM::MemoryUnlock(iMemoryObject);

   580 	__KTRACE_OPT(KMMU,Kern::Printf("DMemModelChunk::Allocate returns %x",r));

   581 	__COND_DEBUG_EVENT(r==KErrNone, EEventUpdateChunk, this);

   582 	return r;

   583 	}

   584 

   585 

   586 TInt DMemModelChunk::Decommit(TInt aOffset, TInt aSize)

   587 	{

   588 	__KTRACE_OPT(KMMU,Kern::Printf("DMemModelChunk::Decommit %x+%x",aOffset,aSize));

   589 	TInt r = CheckRegion(aOffset,aSize);

   590 	if(r<=0)

   591 		return r;

   592 

   593 	MM::MemoryLock(iMemoryObject);

   594 

   595 	TInt i=aOffset>>KPageShift;

   596 	TInt n=aSize>>KPageShift;

   597 	__KTRACE_OPT(KMMU,Kern::Printf("Calling SelectiveFree(%d,%d)",i,n));

   598 

   599 	TUint oldAvail = iPageBitMap->iAvail;

   600 	iPageBitMap->SelectiveFree(i,n);	// free those positions which are actually allocated

   601 	TUint oldSize = iSize;

   602 

   603 	DoDecommit(aOffset,aSize);

   604 

   605 	// Use the bit map to adjust the size of the chunk as unlocked and reclaimed pages

   606 	// will have been unmapped but not removed from the bit map as DoDecommit() only 

   607 	// decommits the mapped pages.

   608 	TUint actualFreedPages = iPageBitMap->iAvail - oldAvail;

   609 	iSize = oldSize - (actualFreedPages << KPageShift);

   610 

   611 	MM::MemoryUnlock(iMemoryObject);

   612 

   613 	r=KErrNone;

   614 	__COND_DEBUG_EVENT(r==KErrNone, EEventUpdateChunk, this);

   615 	return r;

   616 	}

   617 

   618 

   619 TInt DMemModelChunk::Unlock(TInt aOffset, TInt aSize)

   620 	{

   621 	__KTRACE_OPT(KMMU,Kern::Printf("DMemModelChunk::Unlock %x+%x",aOffset,aSize));

   622 	if(!(iAttributes&ECache))

   623 		return KErrGeneral;

   624 	TInt r = CheckRegion(aOffset,aSize);

   625 	if(r<=0)

   626 		return r;

   627 

   628 	MM::MemoryLock(iMemoryObject);

   629 

   630 	TInt i=aOffset>>KPageShift;

   631 	TInt n=aSize>>KPageShift;

   632 	if(iPageBitMap->NotAllocated(i,n))

   633 		r = KErrNotFound;

   634 	else

   635 		r = MM::MemoryAllowDiscard(iMemoryObject,i,n);

   636 

   637 	MM::MemoryUnlock(iMemoryObject);

   638 

   639 	return r;

   640 	}

   641 

   642 

   643 TInt DMemModelChunk::Lock(TInt aOffset, TInt aSize)

   644 	{

   645 	__KTRACE_OPT(KMMU,Kern::Printf("DMemModelChunk::Lock %x+%x",aOffset,aSize));

   646 	if(!(iAttributes&ECache))

   647 		return KErrGeneral;

   648 	TInt r = CheckRegion(aOffset,aSize);

   649 	if(r<=0)

   650 		return r;

   651 

   652 	r = MM::MemoryDisallowDiscard(iMemoryObject, MM::BytesToPages(aOffset), MM::BytesToPages(aSize));

   653 	if(r!=KErrNone)

   654 		Decommit(aOffset,aSize);

   655 

   656 	return r;

   657 	}

   658 

   659 

   660 TInt DMemModelChunk::CheckAccess()

   661 	{

   662 	if(iOwningProcess && iOwningProcess!=TheCurrentThread->iOwningProcess)

   663 		return KErrAccessDenied;

   664 	return KErrNone;

   665 	}

   666 

   667 

   668 void DMemModelChunk::BTracePrime(TInt aCategory)

   669 	{

   670 	DChunk::BTracePrime(aCategory);

   671 #ifdef BTRACE_FLEXIBLE_MEM_MODEL

   672 	if (aCategory == BTrace::EFlexibleMemModel || aCategory == -1)

   673 		{

   674 		if (iMemoryObject)

   675 			{

   676 			MM::MemoryBTracePrime(iMemoryObject);

   677 			BTrace8(BTrace::EFlexibleMemModel,BTrace::EMemoryObjectIsChunk,iMemoryObject,this);

   678 			}

   679 		}

   680 #endif

   681 	}

   682 

   683 

   684 void DMemModelChunk::Substitute(TInt /*aOffset*/, TPhysAddr /*aOldAddr*/, TPhysAddr /*aNewAddr*/)

   685 	{

   686 	MM::Panic(MM::EUnsupportedOperation);

   687 	}

   688
Symaptic